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mbedtls/library/psa_crypto.c
Gilles Peskine 98dd779eb5 Put handle parameter last: psa_generate_derived_key 
In psa_generate_derived_key, change the order of parameters to pass
the pointer where the newly created handle will be stored last.
This is consistent with most other library functions that put inputs
before outputs.
2019-05-15 20:15:31 +02:00

5451 lines
181 KiB
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/*
* PSA crypto layer on top of Mbed TLS crypto
*/
/* Copyright (C) 2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
#include "psa_crypto_service_integration.h"
#include "psa/crypto.h"
#include "psa_crypto_core.h"
#include "psa_crypto_invasive.h"
#include "psa_crypto_slot_management.h"
/* Include internal declarations that are useful for implementing persistently
* stored keys. */
#include "psa_crypto_storage.h"
#include <stdlib.h>
#include <string.h>
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
#include "mbedtls/arc4.h"
#include "mbedtls/asn1.h"
#include "mbedtls/asn1write.h"
#include "mbedtls/bignum.h"
#include "mbedtls/blowfish.h"
#include "mbedtls/camellia.h"
#include "mbedtls/cipher.h"
#include "mbedtls/ccm.h"
#include "mbedtls/cmac.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/des.h"
#include "mbedtls/ecdh.h"
#include "mbedtls/ecp.h"
#include "mbedtls/entropy.h"
#include "mbedtls/error.h"
#include "mbedtls/gcm.h"
#include "mbedtls/md2.h"
#include "mbedtls/md4.h"
#include "mbedtls/md5.h"
#include "mbedtls/md.h"
#include "mbedtls/md_internal.h"
#include "mbedtls/pk.h"
#include "mbedtls/pk_internal.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/ripemd160.h"
#include "mbedtls/rsa.h"
#include "mbedtls/sha1.h"
#include "mbedtls/sha256.h"
#include "mbedtls/sha512.h"
#include "mbedtls/xtea.h"
#define ARRAY_LENGTH( array ) ( sizeof( array ) / sizeof( *( array ) ) )
/* constant-time buffer comparison */
static inline int safer_memcmp( const uint8_t *a, const uint8_t *b, size_t n )
{
size_t i;
unsigned char diff = 0;
for( i = 0; i < n; i++ )
diff |= a[i] ^ b[i];
return( diff );
}
/****************************************************************/
/* Global data, support functions and library management */
/****************************************************************/
static int key_type_is_raw_bytes( psa_key_type_t type )
{
return( PSA_KEY_TYPE_IS_UNSTRUCTURED( type ) );
}
/* Values for psa_global_data_t::rng_state */
#define RNG_NOT_INITIALIZED 0
#define RNG_INITIALIZED 1
#define RNG_SEEDED 2
typedef struct
{
void (* entropy_init )( mbedtls_entropy_context *ctx );
void (* entropy_free )( mbedtls_entropy_context *ctx );
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
unsigned initialized : 1;
unsigned rng_state : 2;
} psa_global_data_t;
static psa_global_data_t global_data;
#define GUARD_MODULE_INITIALIZED \
if( global_data.initialized == 0 ) \
return( PSA_ERROR_BAD_STATE );
static psa_status_t mbedtls_to_psa_error( int ret )
{
/* If there's both a high-level code and low-level code, dispatch on
* the high-level code. */
switch( ret < -0x7f ? - ( -ret & 0x7f80 ) : ret )
{
case 0:
return( PSA_SUCCESS );
case MBEDTLS_ERR_AES_INVALID_KEY_LENGTH:
case MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH:
case MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_AES_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_ASN1_OUT_OF_DATA:
case MBEDTLS_ERR_ASN1_UNEXPECTED_TAG:
case MBEDTLS_ERR_ASN1_INVALID_LENGTH:
case MBEDTLS_ERR_ASN1_LENGTH_MISMATCH:
case MBEDTLS_ERR_ASN1_INVALID_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_ASN1_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_ASN1_BUF_TOO_SMALL:
return( PSA_ERROR_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA)
case MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA:
#elif defined(MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH)
case MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH:
#endif
case MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
#if defined(MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA)
case MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA:
#elif defined(MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH)
case MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH:
#endif
case MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_CCM_BAD_INPUT:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_CCM_AUTH_FAILED:
return( PSA_ERROR_INVALID_SIGNATURE );
case MBEDTLS_ERR_CCM_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_CIPHER_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_CIPHER_INVALID_PADDING:
return( PSA_ERROR_INVALID_PADDING );
case MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED:
return( PSA_ERROR_BAD_STATE );
case MBEDTLS_ERR_CIPHER_AUTH_FAILED:
return( PSA_ERROR_INVALID_SIGNATURE );
case MBEDTLS_ERR_CIPHER_INVALID_CONTEXT:
return( PSA_ERROR_TAMPERING_DETECTED );
case MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED:
return( PSA_ERROR_INSUFFICIENT_ENTROPY );
case MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG:
case MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR:
return( PSA_ERROR_INSUFFICIENT_ENTROPY );
case MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_DES_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED:
case MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE:
case MBEDTLS_ERR_ENTROPY_SOURCE_FAILED:
return( PSA_ERROR_INSUFFICIENT_ENTROPY );
case MBEDTLS_ERR_GCM_AUTH_FAILED:
return( PSA_ERROR_INVALID_SIGNATURE );
case MBEDTLS_ERR_GCM_BAD_INPUT:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_GCM_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_MD2_HW_ACCEL_FAILED:
case MBEDTLS_ERR_MD4_HW_ACCEL_FAILED:
case MBEDTLS_ERR_MD5_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_MD_BAD_INPUT_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MD_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_MD_FILE_IO_ERROR:
return( PSA_ERROR_STORAGE_FAILURE );
case MBEDTLS_ERR_MD_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_MPI_FILE_IO_ERROR:
return( PSA_ERROR_STORAGE_FAILURE );
case MBEDTLS_ERR_MPI_BAD_INPUT_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_INVALID_CHARACTER:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:
return( PSA_ERROR_BUFFER_TOO_SMALL );
case MBEDTLS_ERR_MPI_NEGATIVE_VALUE:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_DIVISION_BY_ZERO:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_NOT_ACCEPTABLE:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_PK_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_PK_TYPE_MISMATCH:
case MBEDTLS_ERR_PK_BAD_INPUT_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_PK_FILE_IO_ERROR:
return( PSA_ERROR_STORAGE_FAILURE );
case MBEDTLS_ERR_PK_KEY_INVALID_VERSION:
case MBEDTLS_ERR_PK_KEY_INVALID_FORMAT:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_PK_UNKNOWN_PK_ALG:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_PK_PASSWORD_REQUIRED:
case MBEDTLS_ERR_PK_PASSWORD_MISMATCH:
return( PSA_ERROR_NOT_PERMITTED );
case MBEDTLS_ERR_PK_INVALID_PUBKEY:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_PK_INVALID_ALG:
case MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE:
case MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_PK_SIG_LEN_MISMATCH:
return( PSA_ERROR_INVALID_SIGNATURE );
case MBEDTLS_ERR_PK_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_RIPEMD160_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_RSA_BAD_INPUT_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_RSA_INVALID_PADDING:
return( PSA_ERROR_INVALID_PADDING );
case MBEDTLS_ERR_RSA_KEY_GEN_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_RSA_KEY_CHECK_FAILED:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_RSA_PUBLIC_FAILED:
case MBEDTLS_ERR_RSA_PRIVATE_FAILED:
return( PSA_ERROR_TAMPERING_DETECTED );
case MBEDTLS_ERR_RSA_VERIFY_FAILED:
return( PSA_ERROR_INVALID_SIGNATURE );
case MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE:
return( PSA_ERROR_BUFFER_TOO_SMALL );
case MBEDTLS_ERR_RSA_RNG_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_RSA_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_SHA1_HW_ACCEL_FAILED:
case MBEDTLS_ERR_SHA256_HW_ACCEL_FAILED:
case MBEDTLS_ERR_SHA512_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_XTEA_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_ECP_BAD_INPUT_DATA:
case MBEDTLS_ERR_ECP_INVALID_KEY:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL:
return( PSA_ERROR_BUFFER_TOO_SMALL );
case MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH:
case MBEDTLS_ERR_ECP_VERIFY_FAILED:
return( PSA_ERROR_INVALID_SIGNATURE );
case MBEDTLS_ERR_ECP_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_ECP_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
default:
return( PSA_ERROR_GENERIC_ERROR );
}
}
/****************************************************************/
/* Key management */
/****************************************************************/
#if defined(MBEDTLS_ECP_C)
static psa_ecc_curve_t mbedtls_ecc_group_to_psa( mbedtls_ecp_group_id grpid )
{
switch( grpid )
{
case MBEDTLS_ECP_DP_SECP192R1:
return( PSA_ECC_CURVE_SECP192R1 );
case MBEDTLS_ECP_DP_SECP224R1:
return( PSA_ECC_CURVE_SECP224R1 );
case MBEDTLS_ECP_DP_SECP256R1:
return( PSA_ECC_CURVE_SECP256R1 );
case MBEDTLS_ECP_DP_SECP384R1:
return( PSA_ECC_CURVE_SECP384R1 );
case MBEDTLS_ECP_DP_SECP521R1:
return( PSA_ECC_CURVE_SECP521R1 );
case MBEDTLS_ECP_DP_BP256R1:
return( PSA_ECC_CURVE_BRAINPOOL_P256R1 );
case MBEDTLS_ECP_DP_BP384R1:
return( PSA_ECC_CURVE_BRAINPOOL_P384R1 );
case MBEDTLS_ECP_DP_BP512R1:
return( PSA_ECC_CURVE_BRAINPOOL_P512R1 );
case MBEDTLS_ECP_DP_CURVE25519:
return( PSA_ECC_CURVE_CURVE25519 );
case MBEDTLS_ECP_DP_SECP192K1:
return( PSA_ECC_CURVE_SECP192K1 );
case MBEDTLS_ECP_DP_SECP224K1:
return( PSA_ECC_CURVE_SECP224K1 );
case MBEDTLS_ECP_DP_SECP256K1:
return( PSA_ECC_CURVE_SECP256K1 );
case MBEDTLS_ECP_DP_CURVE448:
return( PSA_ECC_CURVE_CURVE448 );
default:
return( 0 );
}
}
static mbedtls_ecp_group_id mbedtls_ecc_group_of_psa( psa_ecc_curve_t curve )
{
switch( curve )
{
case PSA_ECC_CURVE_SECP192R1:
return( MBEDTLS_ECP_DP_SECP192R1 );
case PSA_ECC_CURVE_SECP224R1:
return( MBEDTLS_ECP_DP_SECP224R1 );
case PSA_ECC_CURVE_SECP256R1:
return( MBEDTLS_ECP_DP_SECP256R1 );
case PSA_ECC_CURVE_SECP384R1:
return( MBEDTLS_ECP_DP_SECP384R1 );
case PSA_ECC_CURVE_SECP521R1:
return( MBEDTLS_ECP_DP_SECP521R1 );
case PSA_ECC_CURVE_BRAINPOOL_P256R1:
return( MBEDTLS_ECP_DP_BP256R1 );
case PSA_ECC_CURVE_BRAINPOOL_P384R1:
return( MBEDTLS_ECP_DP_BP384R1 );
case PSA_ECC_CURVE_BRAINPOOL_P512R1:
return( MBEDTLS_ECP_DP_BP512R1 );
case PSA_ECC_CURVE_CURVE25519:
return( MBEDTLS_ECP_DP_CURVE25519 );
case PSA_ECC_CURVE_SECP192K1:
return( MBEDTLS_ECP_DP_SECP192K1 );
case PSA_ECC_CURVE_SECP224K1:
return( MBEDTLS_ECP_DP_SECP224K1 );
case PSA_ECC_CURVE_SECP256K1:
return( MBEDTLS_ECP_DP_SECP256K1 );
case PSA_ECC_CURVE_CURVE448:
return( MBEDTLS_ECP_DP_CURVE448 );
default:
return( MBEDTLS_ECP_DP_NONE );
}
}
#endif /* defined(MBEDTLS_ECP_C) */
static psa_status_t prepare_raw_data_slot( psa_key_type_t type,
size_t bits,
struct raw_data *raw )
{
/* Check that the bit size is acceptable for the key type */
switch( type )
{
case PSA_KEY_TYPE_RAW_DATA:
if( bits == 0 )
{
raw->bytes = 0;
raw->data = NULL;
return( PSA_SUCCESS );
}
break;
#if defined(MBEDTLS_MD_C)
case PSA_KEY_TYPE_HMAC:
#endif
case PSA_KEY_TYPE_DERIVE:
break;
#if defined(MBEDTLS_AES_C)
case PSA_KEY_TYPE_AES:
if( bits != 128 && bits != 192 && bits != 256 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
#if defined(MBEDTLS_CAMELLIA_C)
case PSA_KEY_TYPE_CAMELLIA:
if( bits != 128 && bits != 192 && bits != 256 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
#if defined(MBEDTLS_DES_C)
case PSA_KEY_TYPE_DES:
if( bits != 64 && bits != 128 && bits != 192 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
#if defined(MBEDTLS_ARC4_C)
case PSA_KEY_TYPE_ARC4:
if( bits < 8 || bits > 2048 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
default:
return( PSA_ERROR_NOT_SUPPORTED );
}
if( bits % 8 != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
/* Allocate memory for the key */
raw->bytes = PSA_BITS_TO_BYTES( bits );
raw->data = mbedtls_calloc( 1, raw->bytes );
if( raw->data == NULL )
{
raw->bytes = 0;
return( PSA_ERROR_INSUFFICIENT_MEMORY );
}
return( PSA_SUCCESS );
}
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C)
/* Mbed TLS doesn't support non-byte-aligned key sizes (i.e. key sizes
* that are not a multiple of 8) well. For example, there is only
* mbedtls_rsa_get_len(), which returns a number of bytes, and no
* way to return the exact bit size of a key.
* To keep things simple, reject non-byte-aligned key sizes. */
static psa_status_t psa_check_rsa_key_byte_aligned(
const mbedtls_rsa_context *rsa )
{
mbedtls_mpi n;
psa_status_t status;
mbedtls_mpi_init( &n );
status = mbedtls_to_psa_error(
mbedtls_rsa_export( rsa, &n, NULL, NULL, NULL, NULL ) );
if( status == PSA_SUCCESS )
{
if( mbedtls_mpi_bitlen( &n ) % 8 != 0 )
status = PSA_ERROR_NOT_SUPPORTED;
}
mbedtls_mpi_free( &n );
return( status );
}
static psa_status_t psa_import_rsa_key( psa_key_type_t type,
const uint8_t *data,
size_t data_length,
mbedtls_rsa_context **p_rsa )
{
psa_status_t status;
mbedtls_pk_context pk;
mbedtls_rsa_context *rsa;
size_t bits;
mbedtls_pk_init( &pk );
/* Parse the data. */
if( PSA_KEY_TYPE_IS_KEYPAIR( type ) )
status = mbedtls_to_psa_error(
mbedtls_pk_parse_key( &pk, data, data_length, NULL, 0 ) );
else
status = mbedtls_to_psa_error(
mbedtls_pk_parse_public_key( &pk, data, data_length ) );
if( status != PSA_SUCCESS )
goto exit;
/* We have something that the pkparse module recognizes. If it is a
* valid RSA key, store it. */
if( mbedtls_pk_get_type( &pk ) != MBEDTLS_PK_RSA )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
rsa = mbedtls_pk_rsa( pk );
/* The size of an RSA key doesn't have to be a multiple of 8. Mbed TLS
* supports non-byte-aligned key sizes, but not well. For example,
* mbedtls_rsa_get_len() returns the key size in bytes, not in bits. */
bits = PSA_BYTES_TO_BITS( mbedtls_rsa_get_len( rsa ) );
if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
status = psa_check_rsa_key_byte_aligned( rsa );
exit:
/* Free the content of the pk object only on error. */
if( status != PSA_SUCCESS )
{
mbedtls_pk_free( &pk );
return( status );
}
/* On success, store the content of the object in the RSA context. */
*p_rsa = rsa;
return( PSA_SUCCESS );
}
#endif /* defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C) */
#if defined(MBEDTLS_ECP_C)
/* Import a public key given as the uncompressed representation defined by SEC1
* 2.3.3 as the content of an ECPoint. */
static psa_status_t psa_import_ec_public_key( psa_ecc_curve_t curve,
const uint8_t *data,
size_t data_length,
mbedtls_ecp_keypair **p_ecp )
{
psa_status_t status = PSA_ERROR_TAMPERING_DETECTED;
mbedtls_ecp_keypair *ecp = NULL;
mbedtls_ecp_group_id grp_id = mbedtls_ecc_group_of_psa( curve );
*p_ecp = NULL;
ecp = mbedtls_calloc( 1, sizeof( *ecp ) );
if( ecp == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
mbedtls_ecp_keypair_init( ecp );
/* Load the group. */
status = mbedtls_to_psa_error(
mbedtls_ecp_group_load( &ecp->grp, grp_id ) );
if( status != PSA_SUCCESS )
goto exit;
/* Load the public value. */
status = mbedtls_to_psa_error(
mbedtls_ecp_point_read_binary( &ecp->grp, &ecp->Q,
data, data_length ) );
if( status != PSA_SUCCESS )
goto exit;
/* Check that the point is on the curve. */
status = mbedtls_to_psa_error(
mbedtls_ecp_check_pubkey( &ecp->grp, &ecp->Q ) );
if( status != PSA_SUCCESS )
goto exit;
*p_ecp = ecp;
return( PSA_SUCCESS );
exit:
if( ecp != NULL )
{
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
}
return( status );
}
#endif /* defined(MBEDTLS_ECP_C) */
#if defined(MBEDTLS_ECP_C)
/* Import a private key given as a byte string which is the private value
* in big-endian order. */
static psa_status_t psa_import_ec_private_key( psa_ecc_curve_t curve,
const uint8_t *data,
size_t data_length,
mbedtls_ecp_keypair **p_ecp )
{
psa_status_t status = PSA_ERROR_TAMPERING_DETECTED;
mbedtls_ecp_keypair *ecp = NULL;
mbedtls_ecp_group_id grp_id = mbedtls_ecc_group_of_psa( curve );
*p_ecp = NULL;
ecp = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
if( ecp == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
mbedtls_ecp_keypair_init( ecp );
/* Load the group. */
status = mbedtls_to_psa_error(
mbedtls_ecp_group_load( &ecp->grp, grp_id ) );
if( status != PSA_SUCCESS )
goto exit;
/* Load the secret value. */
status = mbedtls_to_psa_error(
mbedtls_mpi_read_binary( &ecp->d, data, data_length ) );
if( status != PSA_SUCCESS )
goto exit;
/* Validate the private key. */
status = mbedtls_to_psa_error(
mbedtls_ecp_check_privkey( &ecp->grp, &ecp->d ) );
if( status != PSA_SUCCESS )
goto exit;
/* Calculate the public key from the private key. */
status = mbedtls_to_psa_error(
mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
mbedtls_ctr_drbg_random, &global_data.ctr_drbg ) );
if( status != PSA_SUCCESS )
goto exit;
*p_ecp = ecp;
return( PSA_SUCCESS );
exit:
if( ecp != NULL )
{
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
}
return( status );
}
#endif /* defined(MBEDTLS_ECP_C) */
/** Import key data into a slot. `slot->type` must have been set
* previously. This function assumes that the slot does not contain
* any key material yet. On failure, the slot content is unchanged. */
psa_status_t psa_import_key_into_slot( psa_key_slot_t *slot,
const uint8_t *data,
size_t data_length )
{
psa_status_t status = PSA_SUCCESS;
if( key_type_is_raw_bytes( slot->type ) )
{
/* Ensure that a bytes-to-bit conversion won't overflow. */
if( data_length > SIZE_MAX / 8 )
return( PSA_ERROR_NOT_SUPPORTED );
status = prepare_raw_data_slot( slot->type,
PSA_BYTES_TO_BITS( data_length ),
&slot->data.raw );
if( status != PSA_SUCCESS )
return( status );
if( data_length != 0 )
memcpy( slot->data.raw.data, data, data_length );
}
else
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC_KEYPAIR( slot->type ) )
{
status = psa_import_ec_private_key( PSA_KEY_TYPE_GET_CURVE( slot->type ),
data, data_length,
&slot->data.ecp );
}
else if( PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY( slot->type ) )
{
status = psa_import_ec_public_key(
PSA_KEY_TYPE_GET_CURVE( slot->type ),
data, data_length,
&slot->data.ecp );
}
else
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
{
status = psa_import_rsa_key( slot->type,
data, data_length,
&slot->data.rsa );
}
else
#endif /* defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C) */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
return( status );
}
/* Retrieve an empty key slot (slot with no key data, but possibly
* with some metadata such as a policy or domain parameters). */
static psa_status_t psa_get_empty_key_slot( psa_key_handle_t handle,
psa_key_slot_t **p_slot )
{
psa_status_t status;
psa_key_slot_t *slot = NULL;
*p_slot = NULL;
status = psa_get_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
if( slot->type != PSA_KEY_TYPE_NONE )
return( PSA_ERROR_ALREADY_EXISTS );
*p_slot = slot;
return( status );
}
/** Calculate the intersection of two algorithm usage policies.
*
* Return 0 (which allows no operation) on incompatibility.
*/
static psa_algorithm_t psa_key_policy_algorithm_intersection(
psa_algorithm_t alg1,
psa_algorithm_t alg2 )
{
/* Common case: the policy only allows alg. */
if( alg1 == alg2 )
return( alg1 );
/* If the policies are from the same hash-and-sign family, check
* if one is a wildcard. If so the other has the specific algorithm. */
if( PSA_ALG_IS_HASH_AND_SIGN( alg1 ) &&
PSA_ALG_IS_HASH_AND_SIGN( alg2 ) &&
( alg1 & ~PSA_ALG_HASH_MASK ) == ( alg2 & ~PSA_ALG_HASH_MASK ) )
{
if( PSA_ALG_SIGN_GET_HASH( alg1 ) == PSA_ALG_ANY_HASH )
return( alg2 );
if( PSA_ALG_SIGN_GET_HASH( alg2 ) == PSA_ALG_ANY_HASH )
return( alg1 );
}
/* If the policies are incompatible, allow nothing. */
return( 0 );
}
/** Test whether a policy permits an algorithm.
*
* The caller must test usage flags separately.
*/
static int psa_key_policy_permits( const psa_key_policy_t *policy,
psa_algorithm_t alg )
{
/* Common case: the policy only allows alg. */
if( alg == policy->alg )
return( 1 );
/* If policy->alg is a hash-and-sign with a wildcard for the hash,
* and alg is the same hash-and-sign family with any hash,
* then alg is compliant with policy->alg. */
if( PSA_ALG_IS_HASH_AND_SIGN( alg ) &&
PSA_ALG_SIGN_GET_HASH( policy->alg ) == PSA_ALG_ANY_HASH )
{
return( ( policy->alg & ~PSA_ALG_HASH_MASK ) ==
( alg & ~PSA_ALG_HASH_MASK ) );
}
/* If it isn't permitted, it's forbidden. */
return( 0 );
}
/** Restrict a key policy based on a constraint.
*
* \param[in,out] policy The policy to restrict.
* \param[in] constraint The policy constraint to apply.
*
* \retval #PSA_SUCCESS
* \c *policy contains the intersection of the original value of
* \c *policy and \c *constraint.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c *policy and \c *constraint are incompatible.
* \c *policy is unchanged.
*/
static psa_status_t psa_restrict_key_policy(
psa_key_policy_t *policy,
const psa_key_policy_t *constraint )
{
psa_algorithm_t intersection_alg =
psa_key_policy_algorithm_intersection( policy->alg, constraint->alg );
if( intersection_alg == 0 && policy->alg != 0 && constraint->alg != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
policy->usage &= constraint->usage;
policy->alg = intersection_alg;
return( PSA_SUCCESS );
}
/** Retrieve a slot which must contain a key. The key must have allow all the
* usage flags set in \p usage. If \p alg is nonzero, the key must allow
* operations with this algorithm. */
static psa_status_t psa_get_key_from_slot( psa_key_handle_t handle,
psa_key_slot_t **p_slot,
psa_key_usage_t usage,
psa_algorithm_t alg )
{
psa_status_t status;
psa_key_slot_t *slot = NULL;
*p_slot = NULL;
status = psa_get_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
if( slot->type == PSA_KEY_TYPE_NONE )
return( PSA_ERROR_DOES_NOT_EXIST );
/* Enforce that usage policy for the key slot contains all the flags
* required by the usage parameter. There is one exception: public
* keys can always be exported, so we treat public key objects as
* if they had the export flag. */
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->type ) )
usage &= ~PSA_KEY_USAGE_EXPORT;
if( ( slot->policy.usage & usage ) != usage )
return( PSA_ERROR_NOT_PERMITTED );
/* Enforce that the usage policy permits the requested algortihm. */
if( alg != 0 && ! psa_key_policy_permits( &slot->policy, alg ) )
return( PSA_ERROR_NOT_PERMITTED );
*p_slot = slot;
return( PSA_SUCCESS );
}
/** Wipe key data from a slot. Preserve metadata such as the policy. */
static psa_status_t psa_remove_key_data_from_memory( psa_key_slot_t *slot )
{
if( slot->type == PSA_KEY_TYPE_NONE )
{
/* No key material to clean. */
}
else if( key_type_is_raw_bytes( slot->type ) )
{
mbedtls_free( slot->data.raw.data );
}
else
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
{
mbedtls_rsa_free( slot->data.rsa );
mbedtls_free( slot->data.rsa );
}
else
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
mbedtls_ecp_keypair_free( slot->data.ecp );
mbedtls_free( slot->data.ecp );
}
else
#endif /* defined(MBEDTLS_ECP_C) */
{
/* Shouldn't happen: the key type is not any type that we
* put in. */
return( PSA_ERROR_TAMPERING_DETECTED );
}
return( PSA_SUCCESS );
}
static void psa_abort_operations_using_key( psa_key_slot_t *slot )
{
/*FIXME how to implement this?*/
(void) slot;
}
/** Completely wipe a slot in memory, including its policy.
* Persistent storage is not affected. */
psa_status_t psa_wipe_key_slot( psa_key_slot_t *slot )
{
psa_status_t status = psa_remove_key_data_from_memory( slot );
psa_abort_operations_using_key( slot );
/* At this point, key material and other type-specific content has
* been wiped. Clear remaining metadata. We can call memset and not
* zeroize because the metadata is not particularly sensitive. */
memset( slot, 0, sizeof( *slot ) );
return( status );
}
psa_status_t psa_import_key_to_handle( psa_key_handle_t handle,
psa_key_type_t type,
const uint8_t *data,
size_t data_length )
{
psa_key_slot_t *slot;
psa_status_t status;
status = psa_get_empty_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
slot->type = type;
status = psa_import_key_into_slot( slot, data, data_length );
if( status != PSA_SUCCESS )
{
slot->type = PSA_KEY_TYPE_NONE;
return( status );
}
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
if( slot->lifetime == PSA_KEY_LIFETIME_PERSISTENT )
{
/* Store in file location */
status = psa_save_persistent_key( slot->persistent_storage_id,
slot->type, &slot->policy, data,
data_length );
if( status != PSA_SUCCESS )
{
(void) psa_remove_key_data_from_memory( slot );
slot->type = PSA_KEY_TYPE_NONE;
}
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
return( status );
}
psa_status_t psa_destroy_key( psa_key_handle_t handle )
{
psa_key_slot_t *slot;
psa_status_t status = PSA_SUCCESS;
psa_status_t storage_status = PSA_SUCCESS;
status = psa_get_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
if( slot->lifetime == PSA_KEY_LIFETIME_PERSISTENT )
{
storage_status =
psa_destroy_persistent_key( slot->persistent_storage_id );
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
status = psa_wipe_key_slot( slot );
if( status != PSA_SUCCESS )
return( status );
return( storage_status );
}
/* Return the size of the key in the given slot, in bits. */
static size_t psa_get_key_slot_bits( const psa_key_slot_t *slot )
{
if( key_type_is_raw_bytes( slot->type ) )
return( slot->data.raw.bytes * 8 );
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
return( PSA_BYTES_TO_BITS( mbedtls_rsa_get_len( slot->data.rsa ) ) );
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC( slot->type ) )
return( slot->data.ecp->grp.pbits );
#endif /* defined(MBEDTLS_ECP_C) */
/* Shouldn't happen except on an empty slot. */
return( 0 );
}
void psa_reset_key_attributes( psa_key_attributes_t *attributes )
{
mbedtls_free( attributes->domain_parameters );
memset( attributes, 0, sizeof( *attributes ) );
}
psa_status_t psa_set_key_domain_parameters( psa_key_attributes_t *attributes,
psa_key_type_t type,
const uint8_t *data,
size_t data_length )
{
uint8_t *copy = NULL;
if( data_length != 0 )
{
copy = mbedtls_calloc( 1, data_length );
if( copy == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
memcpy( copy, data, data_length );
}
/* After this point, this function is guaranteed to succeed, so it
* can start modifying `*attributes`. */
if( attributes->domain_parameters != NULL )
{
mbedtls_free( attributes->domain_parameters );
attributes->domain_parameters = NULL;
attributes->domain_parameters_size = 0;
}
attributes->domain_parameters = copy;
attributes->domain_parameters_size = data_length;
attributes->type = type;
return( PSA_SUCCESS );
}
psa_status_t psa_get_key_domain_parameters(
const psa_key_attributes_t *attributes,
uint8_t *data, size_t data_size, size_t *data_length )
{
if( attributes->domain_parameters_size > data_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
*data_length = attributes->domain_parameters_size;
if( attributes->domain_parameters_size != 0 )
memcpy( data, attributes->domain_parameters,
attributes->domain_parameters_size );
return( PSA_SUCCESS );
}
#if defined(MBEDTLS_RSA_C)
static psa_status_t psa_get_rsa_public_exponent(
const mbedtls_rsa_context *rsa,
psa_key_attributes_t *attributes )
{
mbedtls_mpi mpi;
int ret;
uint8_t *buffer = NULL;
size_t buflen;
mbedtls_mpi_init( &mpi );
ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &mpi );
if( ret != 0 )
goto exit;
if( mbedtls_mpi_cmp_int( &mpi, 65537 ) == 0 )
{
/* It's the default value, which is reported as an empty string,
* so there's nothing to do. */
goto exit;
}
buflen = mbedtls_mpi_size( &mpi );
buffer = mbedtls_calloc( 1, buflen );
if( buffer == NULL )
{
ret = MBEDTLS_ERR_MPI_ALLOC_FAILED;
goto exit;
}
ret = mbedtls_mpi_write_binary( &mpi, buffer, buflen );
if( ret != 0 )
goto exit;
attributes->domain_parameters = buffer;
attributes->domain_parameters_size = buflen;
exit:
mbedtls_mpi_free( &mpi );
if( ret != 0 )
mbedtls_free( buffer );
return( mbedtls_to_psa_error( ret ) );
}
#endif /* MBEDTLS_RSA_C */
psa_status_t psa_get_key_attributes( psa_key_handle_t handle,
psa_key_attributes_t *attributes )
{
psa_key_slot_t *slot;
psa_status_t status;
psa_reset_key_attributes( attributes );
status = psa_get_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
attributes->id = slot->persistent_storage_id;
attributes->lifetime = slot->lifetime;
attributes->policy = slot->policy;
attributes->type = slot->type;
attributes->bits = psa_get_key_slot_bits( slot );
switch( slot->type )
{
#if defined(MBEDTLS_RSA_C)
case PSA_KEY_TYPE_RSA_KEYPAIR:
case PSA_KEY_TYPE_RSA_PUBLIC_KEY:
status = psa_get_rsa_public_exponent( slot->data.rsa, attributes );
break;
#endif
default:
/* Nothing else to do. */
break;
}
if( status != PSA_SUCCESS )
psa_reset_key_attributes( attributes );
return( status );
}
psa_status_t psa_get_key_information( psa_key_handle_t handle,
psa_key_type_t *type,
size_t *bits )
{
psa_key_slot_t *slot;
psa_status_t status;
if( type != NULL )
*type = 0;
if( bits != NULL )
*bits = 0;
status = psa_get_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
if( slot->type == PSA_KEY_TYPE_NONE )
return( PSA_ERROR_DOES_NOT_EXIST );
if( type != NULL )
*type = slot->type;
if( bits != NULL )
*bits = psa_get_key_slot_bits( slot );
return( PSA_SUCCESS );
}
#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECP_C)
static int pk_write_pubkey_simple( mbedtls_pk_context *key,
unsigned char *buf, size_t size )
{
int ret;
unsigned char *c;
size_t len = 0;
c = buf + size;
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
return( (int) len );
}
#endif /* defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECP_C) */
static psa_status_t psa_internal_export_key( const psa_key_slot_t *slot,
uint8_t *data,
size_t data_size,
size_t *data_length,
int export_public_key )
{
*data_length = 0;
if( export_public_key && ! PSA_KEY_TYPE_IS_ASYMMETRIC( slot->type ) )
return( PSA_ERROR_INVALID_ARGUMENT );
if( key_type_is_raw_bytes( slot->type ) )
{
if( slot->data.raw.bytes > data_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
if( data_size != 0 )
{
memcpy( data, slot->data.raw.data, slot->data.raw.bytes );
memset( data + slot->data.raw.bytes, 0,
data_size - slot->data.raw.bytes );
}
*data_length = slot->data.raw.bytes;
return( PSA_SUCCESS );
}
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC_KEYPAIR( slot->type ) && !export_public_key )
{
psa_status_t status;
size_t bytes = PSA_BITS_TO_BYTES( psa_get_key_slot_bits( slot ) );
if( bytes > data_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
status = mbedtls_to_psa_error(
mbedtls_mpi_write_binary( &slot->data.ecp->d, data, bytes ) );
if( status != PSA_SUCCESS )
return( status );
memset( data + bytes, 0, data_size - bytes );
*data_length = bytes;
return( PSA_SUCCESS );
}
#endif
else
{
#if defined(MBEDTLS_PK_WRITE_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) ||
PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
mbedtls_pk_context pk;
int ret;
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
{
#if defined(MBEDTLS_RSA_C)
mbedtls_pk_init( &pk );
pk.pk_info = &mbedtls_rsa_info;
pk.pk_ctx = slot->data.rsa;
#else
return( PSA_ERROR_NOT_SUPPORTED );
#endif
}
else
{
#if defined(MBEDTLS_ECP_C)
mbedtls_pk_init( &pk );
pk.pk_info = &mbedtls_eckey_info;
pk.pk_ctx = slot->data.ecp;
#else
return( PSA_ERROR_NOT_SUPPORTED );
#endif
}
if( export_public_key || PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->type ) )
{
ret = pk_write_pubkey_simple( &pk, data, data_size );
}
else
{
ret = mbedtls_pk_write_key_der( &pk, data, data_size );
}
if( ret < 0 )
{
/* If data_size is 0 then data may be NULL and then the
* call to memset would have undefined behavior. */
if( data_size != 0 )
memset( data, 0, data_size );
return( mbedtls_to_psa_error( ret ) );
}
/* The mbedtls_pk_xxx functions write to the end of the buffer.
* Move the data to the beginning and erase remaining data
* at the original location. */
if( 2 * (size_t) ret <= data_size )
{
memcpy( data, data + data_size - ret, ret );
memset( data + data_size - ret, 0, ret );
}
else if( (size_t) ret < data_size )
{
memmove( data, data + data_size - ret, ret );
memset( data + ret, 0, data_size - ret );
}
*data_length = ret;
return( PSA_SUCCESS );
}
else
#endif /* defined(MBEDTLS_PK_WRITE_C) */
{
/* This shouldn't happen in the reference implementation, but
it is valid for a special-purpose implementation to omit
support for exporting certain key types. */
return( PSA_ERROR_NOT_SUPPORTED );
}
}
}
psa_status_t psa_export_key( psa_key_handle_t handle,
uint8_t *data,
size_t data_size,
size_t *data_length )
{
psa_key_slot_t *slot;
psa_status_t status;
/* Set the key to empty now, so that even when there are errors, we always
* set data_length to a value between 0 and data_size. On error, setting
* the key to empty is a good choice because an empty key representation is
* unlikely to be accepted anywhere. */
*data_length = 0;
/* Export requires the EXPORT flag. There is an exception for public keys,
* which don't require any flag, but psa_get_key_from_slot takes
* care of this. */
status = psa_get_key_from_slot( handle, &slot, PSA_KEY_USAGE_EXPORT, 0 );
if( status != PSA_SUCCESS )
return( status );
return( psa_internal_export_key( slot, data, data_size,
data_length, 0 ) );
}
psa_status_t psa_export_public_key( psa_key_handle_t handle,
uint8_t *data,
size_t data_size,
size_t *data_length )
{
psa_key_slot_t *slot;
psa_status_t status;
/* Set the key to empty now, so that even when there are errors, we always
* set data_length to a value between 0 and data_size. On error, setting
* the key to empty is a good choice because an empty key representation is
* unlikely to be accepted anywhere. */
*data_length = 0;
/* Exporting a public key doesn't require a usage flag. */
status = psa_get_key_from_slot( handle, &slot, 0, 0 );
if( status != PSA_SUCCESS )
return( status );
return( psa_internal_export_key( slot, data, data_size,
data_length, 1 ) );
}
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
static psa_status_t psa_save_generated_persistent_key( psa_key_slot_t *slot,
size_t bits )
{
psa_status_t status;
uint8_t *data;
size_t key_length;
size_t data_size = PSA_KEY_EXPORT_MAX_SIZE( slot->type, bits );
data = mbedtls_calloc( 1, data_size );
if( data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
/* Get key data in export format */
status = psa_internal_export_key( slot, data, data_size, &key_length, 0 );
if( status != PSA_SUCCESS )
{
slot->type = PSA_KEY_TYPE_NONE;
goto exit;
}
/* Store in file location */
status = psa_save_persistent_key( slot->persistent_storage_id,
slot->type, &slot->policy,
data, key_length );
if( status != PSA_SUCCESS )
{
slot->type = PSA_KEY_TYPE_NONE;
}
exit:
mbedtls_platform_zeroize( data, key_length );
mbedtls_free( data );
return( status );
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
static psa_status_t psa_set_key_policy_internal(
psa_key_slot_t *slot,
const psa_key_policy_t *policy )
{
if( ( policy->usage & ~( PSA_KEY_USAGE_EXPORT |
PSA_KEY_USAGE_ENCRYPT |
PSA_KEY_USAGE_DECRYPT |
PSA_KEY_USAGE_SIGN |
PSA_KEY_USAGE_VERIFY |
PSA_KEY_USAGE_DERIVE ) ) != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
slot->policy = *policy;
return( PSA_SUCCESS );
}
/** Prepare a key slot to receive key material.
*
* This function allocates a key slot and sets its metadata.
*
* If this function fails, call psa_fail_key_creation().
*
* This function is intended to be used as follows:
* -# Call psa_start_key_creation() to allocate a key slot, prepare
* it with the specified attributes, and assign it a handle.
* -# Populate the slot with the key material.
* -# Call psa_finish_key_creation() to finalize the creation of the slot.
* In case of failure at any step, stop the sequence and call
* psa_fail_key_creation().
*
* \param attributes Key attributes for the new key.
* \param handle On success, a handle for the allocated slot.
* \param p_slot On success, a pointer to the prepared slot.
*
* \retval #PSA_SUCCESS
* The key slot is ready to receive key material.
* \return If this function fails, the key slot is an invalid state.
* You must call psa_fail_key_creation() to wipe and free the slot.
*/
static psa_status_t psa_start_key_creation(
const psa_key_attributes_t *attributes,
psa_key_handle_t *handle,
psa_key_slot_t **p_slot )
{
psa_status_t status;
psa_key_slot_t *slot;
status = psa_allocate_key( handle );
if( status != PSA_SUCCESS )
return( status );
status = psa_get_key_slot( *handle, p_slot );
if( status != PSA_SUCCESS )
return( status );
slot = *p_slot;
status = psa_set_key_policy_internal( slot, &attributes->policy );
if( status != PSA_SUCCESS )
return( status );
slot->lifetime = attributes->lifetime;
if( attributes->lifetime != PSA_KEY_LIFETIME_VOLATILE )
{
status = psa_validate_persistent_key_parameters( attributes->lifetime,
attributes->id );
if( status != PSA_SUCCESS )
return( status );
slot->persistent_storage_id = attributes->id;
}
slot->type = attributes->type;
return( status );
}
/** Finalize the creation of a key once its key material has been set.
*
* This entails writing the key to persistent storage.
*
* If this function fails, call psa_fail_key_creation().
* See the documentation of psa_start_key_creation() for the intended use
* of this function.
*
* \param slot Pointer to the slot with key material.
*
* \retval #PSA_SUCCESS
* The key was successfully created. The handle is now valid.
* \return If this function fails, the key slot is an invalid state.
* You must call psa_fail_key_creation() to wipe and free the slot.
*/
static psa_status_t psa_finish_key_creation( psa_key_slot_t *slot )
{
psa_status_t status = PSA_SUCCESS;
(void) slot;
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
if( slot->lifetime == PSA_KEY_LIFETIME_PERSISTENT )
{
uint8_t *buffer = NULL;
size_t buffer_size = 0;
size_t length;
buffer_size = PSA_KEY_EXPORT_MAX_SIZE( slot->type,
psa_get_key_slot_bits( slot ) );
buffer = mbedtls_calloc( 1, buffer_size );
if( buffer == NULL && buffer_size != 0 )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_internal_export_key( slot,
buffer, buffer_size, &length,
0 );
if( status == PSA_SUCCESS )
{
status = psa_save_persistent_key( slot->persistent_storage_id,
slot->type, &slot->policy,
buffer, length );
}
if( buffer_size != 0 )
mbedtls_platform_zeroize( buffer, buffer_size );
mbedtls_free( buffer );
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
return( status );
}
/** Abort the creation of a key.
*
* You may call this function after calling psa_start_key_creation(),
* or after psa_finish_key_creation() fails. In other circumstances, this
* function may not clean up persistent storage.
* See the documentation of psa_start_key_creation() for the intended use
* of this function.
*
* \param slot Pointer to the slot with key material.
*/
static void psa_fail_key_creation( psa_key_slot_t *slot )
{
if( slot == NULL )
return;
psa_wipe_key_slot( slot );
}
static psa_status_t psa_check_key_slot_attributes(
const psa_key_slot_t *slot,
const psa_key_attributes_t *attributes )
{
if( attributes->type != 0 )
{
if( attributes->type != slot->type )
return( PSA_ERROR_INVALID_ARGUMENT );
}
if( attributes->domain_parameters_size != 0 )
{
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
{
mbedtls_mpi actual, required;
int ret;
mbedtls_mpi_init( &actual );
mbedtls_mpi_init( &required );
ret = mbedtls_rsa_export( slot->data.rsa,
NULL, NULL, NULL, NULL, &actual );
if( ret != 0 )
goto rsa_exit;
ret = mbedtls_mpi_read_binary( &required,
attributes->domain_parameters,
attributes->domain_parameters_size );
if( ret != 0 )
goto rsa_exit;
if( mbedtls_mpi_cmp_mpi( &actual, &required ) != 0 )
ret = MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
rsa_exit:
mbedtls_mpi_free( &actual );
mbedtls_mpi_free( &required );
if( ret != 0)
return( mbedtls_to_psa_error( ret ) );
}
else
#endif
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
if( attributes->bits != 0 )
{
if( attributes->bits != psa_get_key_slot_bits( slot ) )
return( PSA_ERROR_INVALID_ARGUMENT );
}
return( PSA_SUCCESS );
}
psa_status_t psa_import_key( const psa_key_attributes_t *attributes,
psa_key_handle_t *handle,
const uint8_t *data,
size_t data_length )
{
psa_status_t status;
psa_key_slot_t *slot = NULL;
status = psa_start_key_creation( attributes, handle, &slot );
if( status != PSA_SUCCESS )
goto exit;
status = psa_import_key_into_slot( slot, data, data_length );
if( status != PSA_SUCCESS )
goto exit;
status = psa_check_key_slot_attributes( slot, attributes );
if( status != PSA_SUCCESS )
goto exit;
status = psa_finish_key_creation( slot );
exit:
if( status != PSA_SUCCESS )
{
psa_fail_key_creation( slot );
*handle = 0;
}
return( status );
}
static psa_status_t psa_copy_key_material( const psa_key_slot_t *source,
psa_key_slot_t *target )
{
psa_status_t status;
uint8_t *buffer = NULL;
size_t buffer_size = 0;
size_t length;
buffer_size = PSA_KEY_EXPORT_MAX_SIZE( source->type,
psa_get_key_slot_bits( source ) );
buffer = mbedtls_calloc( 1, buffer_size );
if( buffer == NULL && buffer_size != 0 )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_internal_export_key( source, buffer, buffer_size, &length, 0 );
if( status != PSA_SUCCESS )
goto exit;
target->type = source->type;
status = psa_import_key_into_slot( target, buffer, length );
exit:
if( buffer_size != 0 )
mbedtls_platform_zeroize( buffer, buffer_size );
mbedtls_free( buffer );
return( status );
}
psa_status_t psa_copy_key_to_handle(psa_key_handle_t source_handle,
psa_key_handle_t target_handle,
const psa_key_policy_t *constraint)
{
psa_key_slot_t *source_slot = NULL;
psa_key_slot_t *target_slot = NULL;
psa_key_policy_t new_policy;
psa_status_t status;
status = psa_get_key_from_slot( source_handle, &source_slot, 0, 0 );
if( status != PSA_SUCCESS )
return( status );
status = psa_get_empty_key_slot( target_handle, &target_slot );
if( status != PSA_SUCCESS )
return( status );
new_policy = target_slot->policy;
status = psa_restrict_key_policy( &new_policy, &source_slot->policy );
if( status != PSA_SUCCESS )
return( status );
if( constraint != NULL )
{
status = psa_restrict_key_policy( &new_policy, constraint );
if( status != PSA_SUCCESS )
return( status );
}
status = psa_copy_key_material( source_slot, target_slot );
if( status != PSA_SUCCESS )
return( status );
target_slot->policy = new_policy;
return( PSA_SUCCESS );
}
psa_status_t psa_copy_key( psa_key_handle_t source_handle,
const psa_key_attributes_t *specified_attributes,
psa_key_handle_t *target_handle )
{
psa_status_t status;
psa_key_slot_t *source_slot = NULL;
psa_key_slot_t *target_slot = NULL;
psa_key_attributes_t actual_attributes = *specified_attributes;
status = psa_get_key_from_slot( source_handle, &source_slot, 0, 0 );
if( status != PSA_SUCCESS )
goto exit;
status = psa_check_key_slot_attributes( source_slot, specified_attributes );
if( status != PSA_SUCCESS )
goto exit;
status = psa_restrict_key_policy( &actual_attributes.policy,
&source_slot->policy );
if( status != PSA_SUCCESS )
goto exit;
status = psa_start_key_creation( &actual_attributes,
target_handle, &target_slot );
if( status != PSA_SUCCESS )
goto exit;
status = psa_copy_key_material( source_slot, target_slot );
if( status != PSA_SUCCESS )
goto exit;
status = psa_finish_key_creation( target_slot );
exit:
if( status != PSA_SUCCESS )
{
psa_fail_key_creation( target_slot );
*target_handle = 0;
}
return( status );
}
/****************************************************************/
/* Message digests */
/****************************************************************/
static const mbedtls_md_info_t *mbedtls_md_info_from_psa( psa_algorithm_t alg )
{
switch( alg )
{
#if defined(MBEDTLS_MD2_C)
case PSA_ALG_MD2:
return( &mbedtls_md2_info );
#endif
#if defined(MBEDTLS_MD4_C)
case PSA_ALG_MD4:
return( &mbedtls_md4_info );
#endif
#if defined(MBEDTLS_MD5_C)
case PSA_ALG_MD5:
return( &mbedtls_md5_info );
#endif
#if defined(MBEDTLS_RIPEMD160_C)
case PSA_ALG_RIPEMD160:
return( &mbedtls_ripemd160_info );
#endif
#if defined(MBEDTLS_SHA1_C)
case PSA_ALG_SHA_1:
return( &mbedtls_sha1_info );
#endif
#if defined(MBEDTLS_SHA256_C)
case PSA_ALG_SHA_224:
return( &mbedtls_sha224_info );
case PSA_ALG_SHA_256:
return( &mbedtls_sha256_info );
#endif
#if defined(MBEDTLS_SHA512_C)
case PSA_ALG_SHA_384:
return( &mbedtls_sha384_info );
case PSA_ALG_SHA_512:
return( &mbedtls_sha512_info );
#endif
default:
return( NULL );
}
}
psa_status_t psa_hash_abort( psa_hash_operation_t *operation )
{
switch( operation->alg )
{
case 0:
/* The object has (apparently) been initialized but it is not
* in use. It's ok to call abort on such an object, and there's
* nothing to do. */
break;
#if defined(MBEDTLS_MD2_C)
case PSA_ALG_MD2:
mbedtls_md2_free( &operation->ctx.md2 );
break;
#endif
#if defined(MBEDTLS_MD4_C)
case PSA_ALG_MD4:
mbedtls_md4_free( &operation->ctx.md4 );
break;
#endif
#if defined(MBEDTLS_MD5_C)
case PSA_ALG_MD5:
mbedtls_md5_free( &operation->ctx.md5 );
break;
#endif
#if defined(MBEDTLS_RIPEMD160_C)
case PSA_ALG_RIPEMD160:
mbedtls_ripemd160_free( &operation->ctx.ripemd160 );
break;
#endif
#if defined(MBEDTLS_SHA1_C)
case PSA_ALG_SHA_1:
mbedtls_sha1_free( &operation->ctx.sha1 );
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case PSA_ALG_SHA_224:
case PSA_ALG_SHA_256:
mbedtls_sha256_free( &operation->ctx.sha256 );
break;
#endif
#if defined(MBEDTLS_SHA512_C)
case PSA_ALG_SHA_384:
case PSA_ALG_SHA_512:
mbedtls_sha512_free( &operation->ctx.sha512 );
break;
#endif
default:
return( PSA_ERROR_BAD_STATE );
}
operation->alg = 0;
return( PSA_SUCCESS );
}
psa_status_t psa_hash_setup( psa_hash_operation_t *operation,
psa_algorithm_t alg )
{
int ret;
/* A context must be freshly initialized before it can be set up. */
if( operation->alg != 0 )
{
return( PSA_ERROR_BAD_STATE );
}
switch( alg )
{
#if defined(MBEDTLS_MD2_C)
case PSA_ALG_MD2:
mbedtls_md2_init( &operation->ctx.md2 );
ret = mbedtls_md2_starts_ret( &operation->ctx.md2 );
break;
#endif
#if defined(MBEDTLS_MD4_C)
case PSA_ALG_MD4:
mbedtls_md4_init( &operation->ctx.md4 );
ret = mbedtls_md4_starts_ret( &operation->ctx.md4 );
break;
#endif
#if defined(MBEDTLS_MD5_C)
case PSA_ALG_MD5:
mbedtls_md5_init( &operation->ctx.md5 );
ret = mbedtls_md5_starts_ret( &operation->ctx.md5 );
break;
#endif
#if defined(MBEDTLS_RIPEMD160_C)
case PSA_ALG_RIPEMD160:
mbedtls_ripemd160_init( &operation->ctx.ripemd160 );
ret = mbedtls_ripemd160_starts_ret( &operation->ctx.ripemd160 );
break;
#endif
#if defined(MBEDTLS_SHA1_C)
case PSA_ALG_SHA_1:
mbedtls_sha1_init( &operation->ctx.sha1 );
ret = mbedtls_sha1_starts_ret( &operation->ctx.sha1 );
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case PSA_ALG_SHA_224:
mbedtls_sha256_init( &operation->ctx.sha256 );
ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 1 );
break;
case PSA_ALG_SHA_256:
mbedtls_sha256_init( &operation->ctx.sha256 );
ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 0 );
break;
#endif
#if defined(MBEDTLS_SHA512_C)
case PSA_ALG_SHA_384:
mbedtls_sha512_init( &operation->ctx.sha512 );
ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 1 );
break;
case PSA_ALG_SHA_512:
mbedtls_sha512_init( &operation->ctx.sha512 );
ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 0 );
break;
#endif
default:
return( PSA_ALG_IS_HASH( alg ) ?
PSA_ERROR_NOT_SUPPORTED :
PSA_ERROR_INVALID_ARGUMENT );
}
if( ret == 0 )
operation->alg = alg;
else
psa_hash_abort( operation );
return( mbedtls_to_psa_error( ret ) );
}
psa_status_t psa_hash_update( psa_hash_operation_t *operation,
const uint8_t *input,
size_t input_length )
{
int ret;
/* Don't require hash implementations to behave correctly on a
* zero-length input, which may have an invalid pointer. */
if( input_length == 0 )
return( PSA_SUCCESS );
switch( operation->alg )
{
#if defined(MBEDTLS_MD2_C)
case PSA_ALG_MD2:
ret = mbedtls_md2_update_ret( &operation->ctx.md2,
input, input_length );
break;
#endif
#if defined(MBEDTLS_MD4_C)
case PSA_ALG_MD4:
ret = mbedtls_md4_update_ret( &operation->ctx.md4,
input, input_length );
break;
#endif
#if defined(MBEDTLS_MD5_C)
case PSA_ALG_MD5:
ret = mbedtls_md5_update_ret( &operation->ctx.md5,
input, input_length );
break;
#endif
#if defined(MBEDTLS_RIPEMD160_C)
case PSA_ALG_RIPEMD160:
ret = mbedtls_ripemd160_update_ret( &operation->ctx.ripemd160,
input, input_length );
break;
#endif
#if defined(MBEDTLS_SHA1_C)
case PSA_ALG_SHA_1:
ret = mbedtls_sha1_update_ret( &operation->ctx.sha1,
input, input_length );
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case PSA_ALG_SHA_224:
case PSA_ALG_SHA_256:
ret = mbedtls_sha256_update_ret( &operation->ctx.sha256,
input, input_length );
break;
#endif
#if defined(MBEDTLS_SHA512_C)
case PSA_ALG_SHA_384:
case PSA_ALG_SHA_512:
ret = mbedtls_sha512_update_ret( &operation->ctx.sha512,
input, input_length );
break;
#endif
default:
return( PSA_ERROR_BAD_STATE );
}
if( ret != 0 )
psa_hash_abort( operation );
return( mbedtls_to_psa_error( ret ) );
}
psa_status_t psa_hash_finish( psa_hash_operation_t *operation,
uint8_t *hash,
size_t hash_size,
size_t *hash_length )
{
psa_status_t status;
int ret;
size_t actual_hash_length = PSA_HASH_SIZE( operation->alg );
/* Fill the output buffer with something that isn't a valid hash
* (barring an attack on the hash and deliberately-crafted input),
* in case the caller doesn't check the return status properly. */
*hash_length = hash_size;
/* If hash_size is 0 then hash may be NULL and then the
* call to memset would have undefined behavior. */
if( hash_size != 0 )
memset( hash, '!', hash_size );
if( hash_size < actual_hash_length )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
switch( operation->alg )
{
#if defined(MBEDTLS_MD2_C)
case PSA_ALG_MD2:
ret = mbedtls_md2_finish_ret( &operation->ctx.md2, hash );
break;
#endif
#if defined(MBEDTLS_MD4_C)
case PSA_ALG_MD4:
ret = mbedtls_md4_finish_ret( &operation->ctx.md4, hash );
break;
#endif
#if defined(MBEDTLS_MD5_C)
case PSA_ALG_MD5:
ret = mbedtls_md5_finish_ret( &operation->ctx.md5, hash );
break;
#endif
#if defined(MBEDTLS_RIPEMD160_C)
case PSA_ALG_RIPEMD160:
ret = mbedtls_ripemd160_finish_ret( &operation->ctx.ripemd160, hash );
break;
#endif
#if defined(MBEDTLS_SHA1_C)
case PSA_ALG_SHA_1:
ret = mbedtls_sha1_finish_ret( &operation->ctx.sha1, hash );
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case PSA_ALG_SHA_224:
case PSA_ALG_SHA_256:
ret = mbedtls_sha256_finish_ret( &operation->ctx.sha256, hash );
break;
#endif
#if defined(MBEDTLS_SHA512_C)
case PSA_ALG_SHA_384:
case PSA_ALG_SHA_512:
ret = mbedtls_sha512_finish_ret( &operation->ctx.sha512, hash );
break;
#endif
default:
return( PSA_ERROR_BAD_STATE );
}
status = mbedtls_to_psa_error( ret );
exit:
if( status == PSA_SUCCESS )
{
*hash_length = actual_hash_length;
return( psa_hash_abort( operation ) );
}
else
{
psa_hash_abort( operation );
return( status );
}
}
psa_status_t psa_hash_verify( psa_hash_operation_t *operation,
const uint8_t *hash,
size_t hash_length )
{
uint8_t actual_hash[MBEDTLS_MD_MAX_SIZE];
size_t actual_hash_length;
psa_status_t status = psa_hash_finish( operation,
actual_hash, sizeof( actual_hash ),
&actual_hash_length );
if( status != PSA_SUCCESS )
return( status );
if( actual_hash_length != hash_length )
return( PSA_ERROR_INVALID_SIGNATURE );
if( safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
return( PSA_ERROR_INVALID_SIGNATURE );
return( PSA_SUCCESS );
}
psa_status_t psa_hash_clone( const psa_hash_operation_t *source_operation,
psa_hash_operation_t *target_operation )
{
if( target_operation->alg != 0 )
return( PSA_ERROR_BAD_STATE );
switch( source_operation->alg )
{
case 0:
return( PSA_ERROR_BAD_STATE );
#if defined(MBEDTLS_MD2_C)
case PSA_ALG_MD2:
mbedtls_md2_clone( &target_operation->ctx.md2,
&source_operation->ctx.md2 );
break;
#endif
#if defined(MBEDTLS_MD4_C)
case PSA_ALG_MD4:
mbedtls_md4_clone( &target_operation->ctx.md4,
&source_operation->ctx.md4 );
break;
#endif
#if defined(MBEDTLS_MD5_C)
case PSA_ALG_MD5:
mbedtls_md5_clone( &target_operation->ctx.md5,
&source_operation->ctx.md5 );
break;
#endif
#if defined(MBEDTLS_RIPEMD160_C)
case PSA_ALG_RIPEMD160:
mbedtls_ripemd160_clone( &target_operation->ctx.ripemd160,
&source_operation->ctx.ripemd160 );
break;
#endif
#if defined(MBEDTLS_SHA1_C)
case PSA_ALG_SHA_1:
mbedtls_sha1_clone( &target_operation->ctx.sha1,
&source_operation->ctx.sha1 );
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case PSA_ALG_SHA_224:
case PSA_ALG_SHA_256:
mbedtls_sha256_clone( &target_operation->ctx.sha256,
&source_operation->ctx.sha256 );
break;
#endif
#if defined(MBEDTLS_SHA512_C)
case PSA_ALG_SHA_384:
case PSA_ALG_SHA_512:
mbedtls_sha512_clone( &target_operation->ctx.sha512,
&source_operation->ctx.sha512 );
break;
#endif
default:
return( PSA_ERROR_NOT_SUPPORTED );
}
target_operation->alg = source_operation->alg;
return( PSA_SUCCESS );
}
/****************************************************************/
/* MAC */
/****************************************************************/
static const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa(
psa_algorithm_t alg,
psa_key_type_t key_type,
size_t key_bits,
mbedtls_cipher_id_t* cipher_id )
{
mbedtls_cipher_mode_t mode;
mbedtls_cipher_id_t cipher_id_tmp;
if( PSA_ALG_IS_AEAD( alg ) )
alg = PSA_ALG_AEAD_WITH_TAG_LENGTH( alg, 0 );
if( PSA_ALG_IS_CIPHER( alg ) || PSA_ALG_IS_AEAD( alg ) )
{
switch( alg )
{
case PSA_ALG_ARC4:
mode = MBEDTLS_MODE_STREAM;
break;
case PSA_ALG_CTR:
mode = MBEDTLS_MODE_CTR;
break;
case PSA_ALG_CFB:
mode = MBEDTLS_MODE_CFB;
break;
case PSA_ALG_OFB:
mode = MBEDTLS_MODE_OFB;
break;
case PSA_ALG_CBC_NO_PADDING:
mode = MBEDTLS_MODE_CBC;
break;
case PSA_ALG_CBC_PKCS7:
mode = MBEDTLS_MODE_CBC;
break;
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_CCM, 0 ):
mode = MBEDTLS_MODE_CCM;
break;
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_GCM, 0 ):
mode = MBEDTLS_MODE_GCM;
break;
default:
return( NULL );
}
}
else if( alg == PSA_ALG_CMAC )
mode = MBEDTLS_MODE_ECB;
else if( alg == PSA_ALG_GMAC )
mode = MBEDTLS_MODE_GCM;
else
return( NULL );
switch( key_type )
{
case PSA_KEY_TYPE_AES:
cipher_id_tmp = MBEDTLS_CIPHER_ID_AES;
break;
case PSA_KEY_TYPE_DES:
/* key_bits is 64 for Single-DES, 128 for two-key Triple-DES,
* and 192 for three-key Triple-DES. */
if( key_bits == 64 )
cipher_id_tmp = MBEDTLS_CIPHER_ID_DES;
else
cipher_id_tmp = MBEDTLS_CIPHER_ID_3DES;
/* mbedtls doesn't recognize two-key Triple-DES as an algorithm,
* but two-key Triple-DES is functionally three-key Triple-DES
* with K1=K3, so that's how we present it to mbedtls. */
if( key_bits == 128 )
key_bits = 192;
break;
case PSA_KEY_TYPE_CAMELLIA:
cipher_id_tmp = MBEDTLS_CIPHER_ID_CAMELLIA;
break;
case PSA_KEY_TYPE_ARC4:
cipher_id_tmp = MBEDTLS_CIPHER_ID_ARC4;
break;
default:
return( NULL );
}
if( cipher_id != NULL )
*cipher_id = cipher_id_tmp;
return( mbedtls_cipher_info_from_values( cipher_id_tmp,
(int) key_bits, mode ) );
}
#if defined(MBEDTLS_MD_C)
static size_t psa_get_hash_block_size( psa_algorithm_t alg )
{
switch( alg )
{
case PSA_ALG_MD2:
return( 16 );
case PSA_ALG_MD4:
return( 64 );
case PSA_ALG_MD5:
return( 64 );
case PSA_ALG_RIPEMD160:
return( 64 );
case PSA_ALG_SHA_1:
return( 64 );
case PSA_ALG_SHA_224:
return( 64 );
case PSA_ALG_SHA_256:
return( 64 );
case PSA_ALG_SHA_384:
return( 128 );
case PSA_ALG_SHA_512:
return( 128 );
default:
return( 0 );
}
}
#endif /* MBEDTLS_MD_C */
/* Initialize the MAC operation structure. Once this function has been
* called, psa_mac_abort can run and will do the right thing. */
static psa_status_t psa_mac_init( psa_mac_operation_t *operation,
psa_algorithm_t alg )
{
psa_status_t status = PSA_ERROR_NOT_SUPPORTED;
operation->alg = alg;
operation->key_set = 0;
operation->iv_set = 0;
operation->iv_required = 0;
operation->has_input = 0;
operation->is_sign = 0;
#if defined(MBEDTLS_CMAC_C)
if( alg == PSA_ALG_CMAC )
{
operation->iv_required = 0;
mbedtls_cipher_init( &operation->ctx.cmac );
status = PSA_SUCCESS;
}
else
#endif /* MBEDTLS_CMAC_C */
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HMAC( operation->alg ) )
{
/* We'll set up the hash operation later in psa_hmac_setup_internal. */
operation->ctx.hmac.hash_ctx.alg = 0;
status = PSA_SUCCESS;
}
else
#endif /* MBEDTLS_MD_C */
{
if( ! PSA_ALG_IS_MAC( alg ) )
status = PSA_ERROR_INVALID_ARGUMENT;
}
if( status != PSA_SUCCESS )
memset( operation, 0, sizeof( *operation ) );
return( status );
}
#if defined(MBEDTLS_MD_C)
static psa_status_t psa_hmac_abort_internal( psa_hmac_internal_data *hmac )
{
mbedtls_platform_zeroize( hmac->opad, sizeof( hmac->opad ) );
return( psa_hash_abort( &hmac->hash_ctx ) );
}
static void psa_hmac_init_internal( psa_hmac_internal_data *hmac )
{
/* Instances of psa_hash_operation_s can be initialized by zeroization. */
memset( hmac, 0, sizeof( *hmac ) );
}
#endif /* MBEDTLS_MD_C */
psa_status_t psa_mac_abort( psa_mac_operation_t *operation )
{
if( operation->alg == 0 )
{
/* The object has (apparently) been initialized but it is not
* in use. It's ok to call abort on such an object, and there's
* nothing to do. */
return( PSA_SUCCESS );
}
else
#if defined(MBEDTLS_CMAC_C)
if( operation->alg == PSA_ALG_CMAC )
{
mbedtls_cipher_free( &operation->ctx.cmac );
}
else
#endif /* MBEDTLS_CMAC_C */
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HMAC( operation->alg ) )
{
psa_hmac_abort_internal( &operation->ctx.hmac );
}
else
#endif /* MBEDTLS_MD_C */
{
/* Sanity check (shouldn't happen: operation->alg should
* always have been initialized to a valid value). */
goto bad_state;
}
operation->alg = 0;
operation->key_set = 0;
operation->iv_set = 0;
operation->iv_required = 0;
operation->has_input = 0;
operation->is_sign = 0;
return( PSA_SUCCESS );
bad_state:
/* If abort is called on an uninitialized object, we can't trust
* anything. Wipe the object in case it contains confidential data.
* This may result in a memory leak if a pointer gets overwritten,
* but it's too late to do anything about this. */
memset( operation, 0, sizeof( *operation ) );
return( PSA_ERROR_BAD_STATE );
}
#if defined(MBEDTLS_CMAC_C)
static int psa_cmac_setup( psa_mac_operation_t *operation,
size_t key_bits,
psa_key_slot_t *slot,
const mbedtls_cipher_info_t *cipher_info )
{
int ret;
operation->mac_size = cipher_info->block_size;
ret = mbedtls_cipher_setup( &operation->ctx.cmac, cipher_info );
if( ret != 0 )
return( ret );
ret = mbedtls_cipher_cmac_starts( &operation->ctx.cmac,
slot->data.raw.data,
key_bits );
return( ret );
}
#endif /* MBEDTLS_CMAC_C */
#if defined(MBEDTLS_MD_C)
static psa_status_t psa_hmac_setup_internal( psa_hmac_internal_data *hmac,
const uint8_t *key,
size_t key_length,
psa_algorithm_t hash_alg )
{
unsigned char ipad[PSA_HMAC_MAX_HASH_BLOCK_SIZE];
size_t i;
size_t hash_size = PSA_HASH_SIZE( hash_alg );
size_t block_size = psa_get_hash_block_size( hash_alg );
psa_status_t status;
/* Sanity checks on block_size, to guarantee that there won't be a buffer
* overflow below. This should never trigger if the hash algorithm
* is implemented correctly. */
/* The size checks against the ipad and opad buffers cannot be written
* `block_size > sizeof( ipad ) || block_size > sizeof( hmac->opad )`
* because that triggers -Wlogical-op on GCC 7.3. */
if( block_size > sizeof( ipad ) )
return( PSA_ERROR_NOT_SUPPORTED );
if( block_size > sizeof( hmac->opad ) )
return( PSA_ERROR_NOT_SUPPORTED );
if( block_size < hash_size )
return( PSA_ERROR_NOT_SUPPORTED );
if( key_length > block_size )
{
status = psa_hash_setup( &hmac->hash_ctx, hash_alg );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hash_update( &hmac->hash_ctx, key, key_length );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hash_finish( &hmac->hash_ctx,
ipad, sizeof( ipad ), &key_length );
if( status != PSA_SUCCESS )
goto cleanup;
}
/* A 0-length key is not commonly used in HMAC when used as a MAC,
* but it is permitted. It is common when HMAC is used in HKDF, for
* example. Don't call `memcpy` in the 0-length because `key` could be
* an invalid pointer which would make the behavior undefined. */
else if( key_length != 0 )
memcpy( ipad, key, key_length );
/* ipad contains the key followed by garbage. Xor and fill with 0x36
* to create the ipad value. */
for( i = 0; i < key_length; i++ )
ipad[i] ^= 0x36;
memset( ipad + key_length, 0x36, block_size - key_length );
/* Copy the key material from ipad to opad, flipping the requisite bits,
* and filling the rest of opad with the requisite constant. */
for( i = 0; i < key_length; i++ )
hmac->opad[i] = ipad[i] ^ 0x36 ^ 0x5C;
memset( hmac->opad + key_length, 0x5C, block_size - key_length );
status = psa_hash_setup( &hmac->hash_ctx, hash_alg );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hash_update( &hmac->hash_ctx, ipad, block_size );
cleanup:
mbedtls_platform_zeroize( ipad, key_length );
return( status );
}
#endif /* MBEDTLS_MD_C */
static psa_status_t psa_mac_setup( psa_mac_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg,
int is_sign )
{
psa_status_t status;
psa_key_slot_t *slot;
size_t key_bits;
psa_key_usage_t usage =
is_sign ? PSA_KEY_USAGE_SIGN : PSA_KEY_USAGE_VERIFY;
unsigned char truncated = PSA_MAC_TRUNCATED_LENGTH( alg );
psa_algorithm_t full_length_alg = PSA_ALG_FULL_LENGTH_MAC( alg );
/* A context must be freshly initialized before it can be set up. */
if( operation->alg != 0 )
{
return( PSA_ERROR_BAD_STATE );
}
status = psa_mac_init( operation, full_length_alg );
if( status != PSA_SUCCESS )
return( status );
if( is_sign )
operation->is_sign = 1;
status = psa_get_key_from_slot( handle, &slot, usage, alg );
if( status != PSA_SUCCESS )
goto exit;
key_bits = psa_get_key_slot_bits( slot );
#if defined(MBEDTLS_CMAC_C)
if( full_length_alg == PSA_ALG_CMAC )
{
const mbedtls_cipher_info_t *cipher_info =
mbedtls_cipher_info_from_psa( full_length_alg,
slot->type, key_bits, NULL );
int ret;
if( cipher_info == NULL )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
operation->mac_size = cipher_info->block_size;
ret = psa_cmac_setup( operation, key_bits, slot, cipher_info );
status = mbedtls_to_psa_error( ret );
}
else
#endif /* MBEDTLS_CMAC_C */
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HMAC( full_length_alg ) )
{
psa_algorithm_t hash_alg = PSA_ALG_HMAC_GET_HASH( alg );
if( hash_alg == 0 )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
operation->mac_size = PSA_HASH_SIZE( hash_alg );
/* Sanity check. This shouldn't fail on a valid configuration. */
if( operation->mac_size == 0 ||
operation->mac_size > sizeof( operation->ctx.hmac.opad ) )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
if( slot->type != PSA_KEY_TYPE_HMAC )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
status = psa_hmac_setup_internal( &operation->ctx.hmac,
slot->data.raw.data,
slot->data.raw.bytes,
hash_alg );
}
else
#endif /* MBEDTLS_MD_C */
{
(void) key_bits;
status = PSA_ERROR_NOT_SUPPORTED;
}
if( truncated == 0 )
{
/* The "normal" case: untruncated algorithm. Nothing to do. */
}
else if( truncated < 4 )
{
/* A very short MAC is too short for security since it can be
* brute-forced. Ancient protocols with 32-bit MACs do exist,
* so we make this our minimum, even though 32 bits is still
* too small for security. */
status = PSA_ERROR_NOT_SUPPORTED;
}
else if( truncated > operation->mac_size )
{
/* It's impossible to "truncate" to a larger length. */
status = PSA_ERROR_INVALID_ARGUMENT;
}
else
operation->mac_size = truncated;
exit:
if( status != PSA_SUCCESS )
{
psa_mac_abort( operation );
}
else
{
operation->key_set = 1;
}
return( status );
}
psa_status_t psa_mac_sign_setup( psa_mac_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg )
{
return( psa_mac_setup( operation, handle, alg, 1 ) );
}
psa_status_t psa_mac_verify_setup( psa_mac_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg )
{
return( psa_mac_setup( operation, handle, alg, 0 ) );
}
psa_status_t psa_mac_update( psa_mac_operation_t *operation,
const uint8_t *input,
size_t input_length )
{
psa_status_t status = PSA_ERROR_BAD_STATE;
if( ! operation->key_set )
return( PSA_ERROR_BAD_STATE );
if( operation->iv_required && ! operation->iv_set )
return( PSA_ERROR_BAD_STATE );
operation->has_input = 1;
#if defined(MBEDTLS_CMAC_C)
if( operation->alg == PSA_ALG_CMAC )
{
int ret = mbedtls_cipher_cmac_update( &operation->ctx.cmac,
input, input_length );
status = mbedtls_to_psa_error( ret );
}
else
#endif /* MBEDTLS_CMAC_C */
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HMAC( operation->alg ) )
{
status = psa_hash_update( &operation->ctx.hmac.hash_ctx, input,
input_length );
}
else
#endif /* MBEDTLS_MD_C */
{
/* This shouldn't happen if `operation` was initialized by
* a setup function. */
return( PSA_ERROR_BAD_STATE );
}
if( status != PSA_SUCCESS )
psa_mac_abort( operation );
return( status );
}
#if defined(MBEDTLS_MD_C)
static psa_status_t psa_hmac_finish_internal( psa_hmac_internal_data *hmac,
uint8_t *mac,
size_t mac_size )
{
unsigned char tmp[MBEDTLS_MD_MAX_SIZE];
psa_algorithm_t hash_alg = hmac->hash_ctx.alg;
size_t hash_size = 0;
size_t block_size = psa_get_hash_block_size( hash_alg );
psa_status_t status;
status = psa_hash_finish( &hmac->hash_ctx, tmp, sizeof( tmp ), &hash_size );
if( status != PSA_SUCCESS )
return( status );
/* From here on, tmp needs to be wiped. */
status = psa_hash_setup( &hmac->hash_ctx, hash_alg );
if( status != PSA_SUCCESS )
goto exit;
status = psa_hash_update( &hmac->hash_ctx, hmac->opad, block_size );
if( status != PSA_SUCCESS )
goto exit;
status = psa_hash_update( &hmac->hash_ctx, tmp, hash_size );
if( status != PSA_SUCCESS )
goto exit;
status = psa_hash_finish( &hmac->hash_ctx, tmp, sizeof( tmp ), &hash_size );
if( status != PSA_SUCCESS )
goto exit;
memcpy( mac, tmp, mac_size );
exit:
mbedtls_platform_zeroize( tmp, hash_size );
return( status );
}
#endif /* MBEDTLS_MD_C */
static psa_status_t psa_mac_finish_internal( psa_mac_operation_t *operation,
uint8_t *mac,
size_t mac_size )
{
if( ! operation->key_set )
return( PSA_ERROR_BAD_STATE );
if( operation->iv_required && ! operation->iv_set )
return( PSA_ERROR_BAD_STATE );
if( mac_size < operation->mac_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_CMAC_C)
if( operation->alg == PSA_ALG_CMAC )
{
uint8_t tmp[PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE];
int ret = mbedtls_cipher_cmac_finish( &operation->ctx.cmac, tmp );
if( ret == 0 )
memcpy( mac, tmp, operation->mac_size );
mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
return( mbedtls_to_psa_error( ret ) );
}
else
#endif /* MBEDTLS_CMAC_C */
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HMAC( operation->alg ) )
{
return( psa_hmac_finish_internal( &operation->ctx.hmac,
mac, operation->mac_size ) );
}
else
#endif /* MBEDTLS_MD_C */
{
/* This shouldn't happen if `operation` was initialized by
* a setup function. */
return( PSA_ERROR_BAD_STATE );
}
}
psa_status_t psa_mac_sign_finish( psa_mac_operation_t *operation,
uint8_t *mac,
size_t mac_size,
size_t *mac_length )
{
psa_status_t status;
if( operation->alg == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
/* Fill the output buffer with something that isn't a valid mac
* (barring an attack on the mac and deliberately-crafted input),
* in case the caller doesn't check the return status properly. */
*mac_length = mac_size;
/* If mac_size is 0 then mac may be NULL and then the
* call to memset would have undefined behavior. */
if( mac_size != 0 )
memset( mac, '!', mac_size );
if( ! operation->is_sign )
{
return( PSA_ERROR_BAD_STATE );
}
status = psa_mac_finish_internal( operation, mac, mac_size );
if( status == PSA_SUCCESS )
{
status = psa_mac_abort( operation );
if( status == PSA_SUCCESS )
*mac_length = operation->mac_size;
else
memset( mac, '!', mac_size );
}
else
psa_mac_abort( operation );
return( status );
}
psa_status_t psa_mac_verify_finish( psa_mac_operation_t *operation,
const uint8_t *mac,
size_t mac_length )
{
uint8_t actual_mac[PSA_MAC_MAX_SIZE];
psa_status_t status;
if( operation->alg == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
if( operation->is_sign )
{
return( PSA_ERROR_BAD_STATE );
}
if( operation->mac_size != mac_length )
{
status = PSA_ERROR_INVALID_SIGNATURE;
goto cleanup;
}
status = psa_mac_finish_internal( operation,
actual_mac, sizeof( actual_mac ) );
if( safer_memcmp( mac, actual_mac, mac_length ) != 0 )
status = PSA_ERROR_INVALID_SIGNATURE;
cleanup:
if( status == PSA_SUCCESS )
status = psa_mac_abort( operation );
else
psa_mac_abort( operation );
mbedtls_platform_zeroize( actual_mac, sizeof( actual_mac ) );
return( status );
}
/****************************************************************/
/* Asymmetric cryptography */
/****************************************************************/
#if defined(MBEDTLS_RSA_C)
/* Decode the hash algorithm from alg and store the mbedtls encoding in
* md_alg. Verify that the hash length is acceptable. */
static psa_status_t psa_rsa_decode_md_type( psa_algorithm_t alg,
size_t hash_length,
mbedtls_md_type_t *md_alg )
{
psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
*md_alg = mbedtls_md_get_type( md_info );
/* The Mbed TLS RSA module uses an unsigned int for hash length
* parameters. Validate that it fits so that we don't risk an
* overflow later. */
#if SIZE_MAX > UINT_MAX
if( hash_length > UINT_MAX )
return( PSA_ERROR_INVALID_ARGUMENT );
#endif
#if defined(MBEDTLS_PKCS1_V15)
/* For PKCS#1 v1.5 signature, if using a hash, the hash length
* must be correct. */
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) &&
alg != PSA_ALG_RSA_PKCS1V15_SIGN_RAW )
{
if( md_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
if( mbedtls_md_get_size( md_info ) != hash_length )
return( PSA_ERROR_INVALID_ARGUMENT );
}
#endif /* MBEDTLS_PKCS1_V15 */
#if defined(MBEDTLS_PKCS1_V21)
/* PSS requires a hash internally. */
if( PSA_ALG_IS_RSA_PSS( alg ) )
{
if( md_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
}
#endif /* MBEDTLS_PKCS1_V21 */
return( PSA_SUCCESS );
}
static psa_status_t psa_rsa_sign( mbedtls_rsa_context *rsa,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length )
{
psa_status_t status;
int ret;
mbedtls_md_type_t md_alg;
status = psa_rsa_decode_md_type( alg, hash_length, &md_alg );
if( status != PSA_SUCCESS )
return( status );
if( signature_size < mbedtls_rsa_get_len( rsa ) )
return( PSA_ERROR_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_PKCS1_V15)
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) )
{
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15,
MBEDTLS_MD_NONE );
ret = mbedtls_rsa_pkcs1_sign( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PRIVATE,
md_alg,
(unsigned int) hash_length,
hash,
signature );
}
else
#endif /* MBEDTLS_PKCS1_V15 */
#if defined(MBEDTLS_PKCS1_V21)
if( PSA_ALG_IS_RSA_PSS( alg ) )
{
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
ret = mbedtls_rsa_rsassa_pss_sign( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PRIVATE,
MBEDTLS_MD_NONE,
(unsigned int) hash_length,
hash,
signature );
}
else
#endif /* MBEDTLS_PKCS1_V21 */
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
if( ret == 0 )
*signature_length = mbedtls_rsa_get_len( rsa );
return( mbedtls_to_psa_error( ret ) );
}
static psa_status_t psa_rsa_verify( mbedtls_rsa_context *rsa,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *signature,
size_t signature_length )
{
psa_status_t status;
int ret;
mbedtls_md_type_t md_alg;
status = psa_rsa_decode_md_type( alg, hash_length, &md_alg );
if( status != PSA_SUCCESS )
return( status );
if( signature_length < mbedtls_rsa_get_len( rsa ) )
return( PSA_ERROR_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_PKCS1_V15)
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) )
{
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15,
MBEDTLS_MD_NONE );
ret = mbedtls_rsa_pkcs1_verify( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PUBLIC,
md_alg,
(unsigned int) hash_length,
hash,
signature );
}
else
#endif /* MBEDTLS_PKCS1_V15 */
#if defined(MBEDTLS_PKCS1_V21)
if( PSA_ALG_IS_RSA_PSS( alg ) )
{
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
ret = mbedtls_rsa_rsassa_pss_verify( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PUBLIC,
MBEDTLS_MD_NONE,
(unsigned int) hash_length,
hash,
signature );
}
else
#endif /* MBEDTLS_PKCS1_V21 */
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
/* Mbed TLS distinguishes "invalid padding" from "valid padding but
* the rest of the signature is invalid". This has little use in
* practice and PSA doesn't report this distinction. */
if( ret == MBEDTLS_ERR_RSA_INVALID_PADDING )
return( PSA_ERROR_INVALID_SIGNATURE );
return( mbedtls_to_psa_error( ret ) );
}
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECDSA_C)
/* `ecp` cannot be const because `ecp->grp` needs to be non-const
* for mbedtls_ecdsa_sign() and mbedtls_ecdsa_sign_det()
* (even though these functions don't modify it). */
static psa_status_t psa_ecdsa_sign( mbedtls_ecp_keypair *ecp,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length )
{
int ret;
mbedtls_mpi r, s;
size_t curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
mbedtls_mpi_init( &r );
mbedtls_mpi_init( &s );
if( signature_size < 2 * curve_bytes )
{
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
goto cleanup;
}
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
if( PSA_ALG_DSA_IS_DETERMINISTIC( alg ) )
{
psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
mbedtls_md_type_t md_alg = mbedtls_md_get_type( md_info );
MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det( &ecp->grp, &r, &s, &ecp->d,
hash, hash_length,
md_alg ) );
}
else
#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
{
(void) alg;
MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ecp->grp, &r, &s, &ecp->d,
hash, hash_length,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg ) );
}
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &r,
signature,
curve_bytes ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &s,
signature + curve_bytes,
curve_bytes ) );
cleanup:
mbedtls_mpi_free( &r );
mbedtls_mpi_free( &s );
if( ret == 0 )
*signature_length = 2 * curve_bytes;
return( mbedtls_to_psa_error( ret ) );
}
static psa_status_t psa_ecdsa_verify( mbedtls_ecp_keypair *ecp,
const uint8_t *hash,
size_t hash_length,
const uint8_t *signature,
size_t signature_length )
{
int ret;
mbedtls_mpi r, s;
size_t curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
mbedtls_mpi_init( &r );
mbedtls_mpi_init( &s );
if( signature_length != 2 * curve_bytes )
return( PSA_ERROR_INVALID_SIGNATURE );
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r,
signature,
curve_bytes ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &s,
signature + curve_bytes,
curve_bytes ) );
ret = mbedtls_ecdsa_verify( &ecp->grp, hash, hash_length,
&ecp->Q, &r, &s );
cleanup:
mbedtls_mpi_free( &r );
mbedtls_mpi_free( &s );
return( mbedtls_to_psa_error( ret ) );
}
#endif /* MBEDTLS_ECDSA_C */
psa_status_t psa_asymmetric_sign( psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length )
{
psa_key_slot_t *slot;
psa_status_t status;
*signature_length = signature_size;
status = psa_get_key_from_slot( handle, &slot, PSA_KEY_USAGE_SIGN, alg );
if( status != PSA_SUCCESS )
goto exit;
if( ! PSA_KEY_TYPE_IS_KEYPAIR( slot->type ) )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
#if defined(MBEDTLS_RSA_C)
if( slot->type == PSA_KEY_TYPE_RSA_KEYPAIR )
{
status = psa_rsa_sign( slot->data.rsa,
alg,
hash, hash_length,
signature, signature_size,
signature_length );
}
else
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
#if defined(MBEDTLS_ECDSA_C)
if(
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
PSA_ALG_IS_ECDSA( alg )
#else
PSA_ALG_IS_RANDOMIZED_ECDSA( alg )
#endif
)
status = psa_ecdsa_sign( slot->data.ecp,
alg,
hash, hash_length,
signature, signature_size,
signature_length );
else
#endif /* defined(MBEDTLS_ECDSA_C) */
{
status = PSA_ERROR_INVALID_ARGUMENT;
}
}
else
#endif /* defined(MBEDTLS_ECP_C) */
{
status = PSA_ERROR_NOT_SUPPORTED;
}
exit:
/* Fill the unused part of the output buffer (the whole buffer on error,
* the trailing part on success) with something that isn't a valid mac
* (barring an attack on the mac and deliberately-crafted input),
* in case the caller doesn't check the return status properly. */
if( status == PSA_SUCCESS )
memset( signature + *signature_length, '!',
signature_size - *signature_length );
else if( signature_size != 0 )
memset( signature, '!', signature_size );
/* If signature_size is 0 then we have nothing to do. We must not call
* memset because signature may be NULL in this case. */
return( status );
}
psa_status_t psa_asymmetric_verify( psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *signature,
size_t signature_length )
{
psa_key_slot_t *slot;
psa_status_t status;
status = psa_get_key_from_slot( handle, &slot, PSA_KEY_USAGE_VERIFY, alg );
if( status != PSA_SUCCESS )
return( status );
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
{
return( psa_rsa_verify( slot->data.rsa,
alg,
hash, hash_length,
signature, signature_length ) );
}
else
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
#if defined(MBEDTLS_ECDSA_C)
if( PSA_ALG_IS_ECDSA( alg ) )
return( psa_ecdsa_verify( slot->data.ecp,
hash, hash_length,
signature, signature_length ) );
else
#endif /* defined(MBEDTLS_ECDSA_C) */
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
else
#endif /* defined(MBEDTLS_ECP_C) */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
}
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
static void psa_rsa_oaep_set_padding_mode( psa_algorithm_t alg,
mbedtls_rsa_context *rsa )
{
psa_algorithm_t hash_alg = PSA_ALG_RSA_OAEP_GET_HASH( alg );
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
mbedtls_md_type_t md_alg = mbedtls_md_get_type( md_info );
mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
}
#endif /* defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21) */
psa_status_t psa_asymmetric_encrypt( psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *output,
size_t output_size,
size_t *output_length )
{
psa_key_slot_t *slot;
psa_status_t status;
(void) input;
(void) input_length;
(void) salt;
(void) output;
(void) output_size;
*output_length = 0;
if( ! PSA_ALG_IS_RSA_OAEP( alg ) && salt_length != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_get_key_from_slot( handle, &slot, PSA_KEY_USAGE_ENCRYPT, alg );
if( status != PSA_SUCCESS )
return( status );
if( ! ( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->type ) ||
PSA_KEY_TYPE_IS_KEYPAIR( slot->type ) ) )
return( PSA_ERROR_INVALID_ARGUMENT );
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
{
mbedtls_rsa_context *rsa = slot->data.rsa;
int ret;
if( output_size < mbedtls_rsa_get_len( rsa ) )
return( PSA_ERROR_INVALID_ARGUMENT );
#if defined(MBEDTLS_PKCS1_V15)
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
{
ret = mbedtls_rsa_pkcs1_encrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PUBLIC,
input_length,
input,
output );
}
else
#endif /* MBEDTLS_PKCS1_V15 */
#if defined(MBEDTLS_PKCS1_V21)
if( PSA_ALG_IS_RSA_OAEP( alg ) )
{
psa_rsa_oaep_set_padding_mode( alg, rsa );
ret = mbedtls_rsa_rsaes_oaep_encrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PUBLIC,
salt, salt_length,
input_length,
input,
output );
}
else
#endif /* MBEDTLS_PKCS1_V21 */
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
if( ret == 0 )
*output_length = mbedtls_rsa_get_len( rsa );
return( mbedtls_to_psa_error( ret ) );
}
else
#endif /* defined(MBEDTLS_RSA_C) */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
}
psa_status_t psa_asymmetric_decrypt( psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *output,
size_t output_size,
size_t *output_length )
{
psa_key_slot_t *slot;
psa_status_t status;
(void) input;
(void) input_length;
(void) salt;
(void) output;
(void) output_size;
*output_length = 0;
if( ! PSA_ALG_IS_RSA_OAEP( alg ) && salt_length != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_get_key_from_slot( handle, &slot, PSA_KEY_USAGE_DECRYPT, alg );
if( status != PSA_SUCCESS )
return( status );
if( ! PSA_KEY_TYPE_IS_KEYPAIR( slot->type ) )
return( PSA_ERROR_INVALID_ARGUMENT );
#if defined(MBEDTLS_RSA_C)
if( slot->type == PSA_KEY_TYPE_RSA_KEYPAIR )
{
mbedtls_rsa_context *rsa = slot->data.rsa;
int ret;
if( input_length != mbedtls_rsa_get_len( rsa ) )
return( PSA_ERROR_INVALID_ARGUMENT );
#if defined(MBEDTLS_PKCS1_V15)
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
{
ret = mbedtls_rsa_pkcs1_decrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PRIVATE,
output_length,
input,
output,
output_size );
}
else
#endif /* MBEDTLS_PKCS1_V15 */
#if defined(MBEDTLS_PKCS1_V21)
if( PSA_ALG_IS_RSA_OAEP( alg ) )
{
psa_rsa_oaep_set_padding_mode( alg, rsa );
ret = mbedtls_rsa_rsaes_oaep_decrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PRIVATE,
salt, salt_length,
output_length,
input,
output,
output_size );
}
else
#endif /* MBEDTLS_PKCS1_V21 */
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
return( mbedtls_to_psa_error( ret ) );
}
else
#endif /* defined(MBEDTLS_RSA_C) */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
}
/****************************************************************/
/* Symmetric cryptography */
/****************************************************************/
/* Initialize the cipher operation structure. Once this function has been
* called, psa_cipher_abort can run and will do the right thing. */
static psa_status_t psa_cipher_init( psa_cipher_operation_t *operation,
psa_algorithm_t alg )
{
if( ! PSA_ALG_IS_CIPHER( alg ) )
{
memset( operation, 0, sizeof( *operation ) );
return( PSA_ERROR_INVALID_ARGUMENT );
}
operation->alg = alg;
operation->key_set = 0;
operation->iv_set = 0;
operation->iv_required = 1;
operation->iv_size = 0;
operation->block_size = 0;
mbedtls_cipher_init( &operation->ctx.cipher );
return( PSA_SUCCESS );
}
static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg,
mbedtls_operation_t cipher_operation )
{
int ret = 0;
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
psa_key_slot_t *slot;
size_t key_bits;
const mbedtls_cipher_info_t *cipher_info = NULL;
psa_key_usage_t usage = ( cipher_operation == MBEDTLS_ENCRYPT ?
PSA_KEY_USAGE_ENCRYPT :
PSA_KEY_USAGE_DECRYPT );
/* A context must be freshly initialized before it can be set up. */
if( operation->alg != 0 )
{
return( PSA_ERROR_BAD_STATE );
}
status = psa_cipher_init( operation, alg );
if( status != PSA_SUCCESS )
return( status );
status = psa_get_key_from_slot( handle, &slot, usage, alg);
if( status != PSA_SUCCESS )
goto exit;
key_bits = psa_get_key_slot_bits( slot );
cipher_info = mbedtls_cipher_info_from_psa( alg, slot->type, key_bits, NULL );
if( cipher_info == NULL )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
ret = mbedtls_cipher_setup( &operation->ctx.cipher, cipher_info );
if( ret != 0 )
goto exit;
#if defined(MBEDTLS_DES_C)
if( slot->type == PSA_KEY_TYPE_DES && key_bits == 128 )
{
/* Two-key Triple-DES is 3-key Triple-DES with K1=K3 */
unsigned char keys[24];
memcpy( keys, slot->data.raw.data, 16 );
memcpy( keys + 16, slot->data.raw.data, 8 );
ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
keys,
192, cipher_operation );
}
else
#endif
{
ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
slot->data.raw.data,
(int) key_bits, cipher_operation );
}
if( ret != 0 )
goto exit;
#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
switch( alg )
{
case PSA_ALG_CBC_NO_PADDING:
ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
MBEDTLS_PADDING_NONE );
break;
case PSA_ALG_CBC_PKCS7:
ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
MBEDTLS_PADDING_PKCS7 );
break;
default:
/* The algorithm doesn't involve padding. */
ret = 0;
break;
}
if( ret != 0 )
goto exit;
#endif //MBEDTLS_CIPHER_MODE_WITH_PADDING
operation->key_set = 1;
operation->block_size = ( PSA_ALG_IS_STREAM_CIPHER( alg ) ? 1 :
PSA_BLOCK_CIPHER_BLOCK_SIZE( slot->type ) );
if( alg & PSA_ALG_CIPHER_FROM_BLOCK_FLAG )
{
operation->iv_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( slot->type );
}
exit:
if( status == 0 )
status = mbedtls_to_psa_error( ret );
if( status != 0 )
psa_cipher_abort( operation );
return( status );
}
psa_status_t psa_cipher_encrypt_setup( psa_cipher_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg )
{
return( psa_cipher_setup( operation, handle, alg, MBEDTLS_ENCRYPT ) );
}
psa_status_t psa_cipher_decrypt_setup( psa_cipher_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg )
{
return( psa_cipher_setup( operation, handle, alg, MBEDTLS_DECRYPT ) );
}
psa_status_t psa_cipher_generate_iv( psa_cipher_operation_t *operation,
unsigned char *iv,
size_t iv_size,
size_t *iv_length )
{
psa_status_t status;
int ret;
if( operation->iv_set || ! operation->iv_required )
{
return( PSA_ERROR_BAD_STATE );
}
if( iv_size < operation->iv_size )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg,
iv, operation->iv_size );
if( ret != 0 )
{
status = mbedtls_to_psa_error( ret );
goto exit;
}
*iv_length = operation->iv_size;
status = psa_cipher_set_iv( operation, iv, *iv_length );
exit:
if( status != PSA_SUCCESS )
psa_cipher_abort( operation );
return( status );
}
psa_status_t psa_cipher_set_iv( psa_cipher_operation_t *operation,
const unsigned char *iv,
size_t iv_length )
{
psa_status_t status;
int ret;
if( operation->iv_set || ! operation->iv_required )
{
return( PSA_ERROR_BAD_STATE );
}
if( iv_length != operation->iv_size )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
ret = mbedtls_cipher_set_iv( &operation->ctx.cipher, iv, iv_length );
status = mbedtls_to_psa_error( ret );
exit:
if( status == PSA_SUCCESS )
operation->iv_set = 1;
else
psa_cipher_abort( operation );
return( status );
}
psa_status_t psa_cipher_update( psa_cipher_operation_t *operation,
const uint8_t *input,
size_t input_length,
unsigned char *output,
size_t output_size,
size_t *output_length )
{
psa_status_t status;
int ret;
size_t expected_output_size;
if( operation->alg == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
if( ! PSA_ALG_IS_STREAM_CIPHER( operation->alg ) )
{
/* Take the unprocessed partial block left over from previous
* update calls, if any, plus the input to this call. Remove
* the last partial block, if any. You get the data that will be
* output in this call. */
expected_output_size =
( operation->ctx.cipher.unprocessed_len + input_length )
/ operation->block_size * operation->block_size;
}
else
{
expected_output_size = input_length;
}
if( output_size < expected_output_size )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
ret = mbedtls_cipher_update( &operation->ctx.cipher, input,
input_length, output, output_length );
status = mbedtls_to_psa_error( ret );
exit:
if( status != PSA_SUCCESS )
psa_cipher_abort( operation );
return( status );
}
psa_status_t psa_cipher_finish( psa_cipher_operation_t *operation,
uint8_t *output,
size_t output_size,
size_t *output_length )
{
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
int cipher_ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
uint8_t temp_output_buffer[MBEDTLS_MAX_BLOCK_LENGTH];
if( ! operation->key_set )
{
return( PSA_ERROR_BAD_STATE );
}
if( operation->iv_required && ! operation->iv_set )
{
return( PSA_ERROR_BAD_STATE );
}
if( operation->ctx.cipher.operation == MBEDTLS_ENCRYPT &&
operation->alg == PSA_ALG_CBC_NO_PADDING &&
operation->ctx.cipher.unprocessed_len != 0 )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto error;
}
cipher_ret = mbedtls_cipher_finish( &operation->ctx.cipher,
temp_output_buffer,
output_length );
if( cipher_ret != 0 )
{
status = mbedtls_to_psa_error( cipher_ret );
goto error;
}
if( *output_length == 0 )
; /* Nothing to copy. Note that output may be NULL in this case. */
else if( output_size >= *output_length )
memcpy( output, temp_output_buffer, *output_length );
else
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto error;
}
mbedtls_platform_zeroize( temp_output_buffer, sizeof( temp_output_buffer ) );
status = psa_cipher_abort( operation );
return( status );
error:
*output_length = 0;
mbedtls_platform_zeroize( temp_output_buffer, sizeof( temp_output_buffer ) );
(void) psa_cipher_abort( operation );
return( status );
}
psa_status_t psa_cipher_abort( psa_cipher_operation_t *operation )
{
if( operation->alg == 0 )
{
/* The object has (apparently) been initialized but it is not
* in use. It's ok to call abort on such an object, and there's
* nothing to do. */
return( PSA_SUCCESS );
}
/* Sanity check (shouldn't happen: operation->alg should
* always have been initialized to a valid value). */
if( ! PSA_ALG_IS_CIPHER( operation->alg ) )
return( PSA_ERROR_BAD_STATE );
mbedtls_cipher_free( &operation->ctx.cipher );
operation->alg = 0;
operation->key_set = 0;
operation->iv_set = 0;
operation->iv_size = 0;
operation->block_size = 0;
operation->iv_required = 0;
return( PSA_SUCCESS );
}
/****************************************************************/
/* Key Policy */
/****************************************************************/
#if !defined(MBEDTLS_PSA_CRYPTO_SPM)
void psa_key_policy_set_usage( psa_key_policy_t *policy,
psa_key_usage_t usage,
psa_algorithm_t alg )
{
policy->usage = usage;
policy->alg = alg;
}
psa_key_usage_t psa_key_policy_get_usage( const psa_key_policy_t *policy )
{
return( policy->usage );
}
psa_algorithm_t psa_key_policy_get_algorithm( const psa_key_policy_t *policy )
{
return( policy->alg );
}
#endif /* !defined(MBEDTLS_PSA_CRYPTO_SPM) */
psa_status_t psa_set_key_policy( psa_key_handle_t handle,
const psa_key_policy_t *policy )
{
psa_key_slot_t *slot;
psa_status_t status;
if( policy == NULL )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_get_empty_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
return( psa_set_key_policy_internal( slot, policy ) );
}
psa_status_t psa_get_key_policy( psa_key_handle_t handle,
psa_key_policy_t *policy )
{
psa_key_slot_t *slot;
psa_status_t status;
if( policy == NULL )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_get_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
*policy = slot->policy;
return( PSA_SUCCESS );
}
/****************************************************************/
/* Key Lifetime */
/****************************************************************/
psa_status_t psa_get_key_lifetime_from_handle( psa_key_handle_t handle,
psa_key_lifetime_t *lifetime )
{
psa_key_slot_t *slot;
psa_status_t status;
status = psa_get_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
*lifetime = slot->lifetime;
return( PSA_SUCCESS );
}
/****************************************************************/
/* AEAD */
/****************************************************************/
typedef struct
{
psa_key_slot_t *slot;
const mbedtls_cipher_info_t *cipher_info;
union
{
#if defined(MBEDTLS_CCM_C)
mbedtls_ccm_context ccm;
#endif /* MBEDTLS_CCM_C */
#if defined(MBEDTLS_GCM_C)
mbedtls_gcm_context gcm;
#endif /* MBEDTLS_GCM_C */
} ctx;
psa_algorithm_t core_alg;
uint8_t full_tag_length;
uint8_t tag_length;
} aead_operation_t;
static void psa_aead_abort_internal( aead_operation_t *operation )
{
switch( operation->core_alg )
{
#if defined(MBEDTLS_CCM_C)
case PSA_ALG_CCM:
mbedtls_ccm_free( &operation->ctx.ccm );
break;
#endif /* MBEDTLS_CCM_C */
#if defined(MBEDTLS_GCM_C)
case PSA_ALG_GCM:
mbedtls_gcm_free( &operation->ctx.gcm );
break;
#endif /* MBEDTLS_GCM_C */
}
}
static psa_status_t psa_aead_setup( aead_operation_t *operation,
psa_key_handle_t handle,
psa_key_usage_t usage,
psa_algorithm_t alg )
{
psa_status_t status;
size_t key_bits;
mbedtls_cipher_id_t cipher_id;
status = psa_get_key_from_slot( handle, &operation->slot, usage, alg );
if( status != PSA_SUCCESS )
return( status );
key_bits = psa_get_key_slot_bits( operation->slot );
operation->cipher_info =
mbedtls_cipher_info_from_psa( alg, operation->slot->type, key_bits,
&cipher_id );
if( operation->cipher_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
switch( PSA_ALG_AEAD_WITH_TAG_LENGTH( alg, 0 ) )
{
#if defined(MBEDTLS_CCM_C)
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_CCM, 0 ):
operation->core_alg = PSA_ALG_CCM;
operation->full_tag_length = 16;
if( PSA_BLOCK_CIPHER_BLOCK_SIZE( operation->slot->type ) != 16 )
return( PSA_ERROR_INVALID_ARGUMENT );
mbedtls_ccm_init( &operation->ctx.ccm );
status = mbedtls_to_psa_error(
mbedtls_ccm_setkey( &operation->ctx.ccm, cipher_id,
operation->slot->data.raw.data,
(unsigned int) key_bits ) );
if( status != 0 )
goto cleanup;
break;
#endif /* MBEDTLS_CCM_C */
#if defined(MBEDTLS_GCM_C)
case PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_GCM, 0 ):
operation->core_alg = PSA_ALG_GCM;
operation->full_tag_length = 16;
if( PSA_BLOCK_CIPHER_BLOCK_SIZE( operation->slot->type ) != 16 )
return( PSA_ERROR_INVALID_ARGUMENT );
mbedtls_gcm_init( &operation->ctx.gcm );
status = mbedtls_to_psa_error(
mbedtls_gcm_setkey( &operation->ctx.gcm, cipher_id,
operation->slot->data.raw.data,
(unsigned int) key_bits ) );
break;
#endif /* MBEDTLS_GCM_C */
default:
return( PSA_ERROR_NOT_SUPPORTED );
}
if( PSA_AEAD_TAG_LENGTH( alg ) > operation->full_tag_length )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto cleanup;
}
operation->tag_length = PSA_AEAD_TAG_LENGTH( alg );
/* CCM allows the following tag lengths: 4, 6, 8, 10, 12, 14, 16.
* GCM allows the following tag lengths: 4, 8, 12, 13, 14, 15, 16.
* In both cases, mbedtls_xxx will validate the tag length below. */
return( PSA_SUCCESS );
cleanup:
psa_aead_abort_internal( operation );
return( status );
}
psa_status_t psa_aead_encrypt( psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *nonce,
size_t nonce_length,
const uint8_t *additional_data,
size_t additional_data_length,
const uint8_t *plaintext,
size_t plaintext_length,
uint8_t *ciphertext,
size_t ciphertext_size,
size_t *ciphertext_length )
{
psa_status_t status;
aead_operation_t operation;
uint8_t *tag;
*ciphertext_length = 0;
status = psa_aead_setup( &operation, handle, PSA_KEY_USAGE_ENCRYPT, alg );
if( status != PSA_SUCCESS )
return( status );
/* For all currently supported modes, the tag is at the end of the
* ciphertext. */
if( ciphertext_size < ( plaintext_length + operation.tag_length ) )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
tag = ciphertext + plaintext_length;
#if defined(MBEDTLS_GCM_C)
if( operation.core_alg == PSA_ALG_GCM )
{
status = mbedtls_to_psa_error(
mbedtls_gcm_crypt_and_tag( &operation.ctx.gcm,
MBEDTLS_GCM_ENCRYPT,
plaintext_length,
nonce, nonce_length,
additional_data, additional_data_length,
plaintext, ciphertext,
operation.tag_length, tag ) );
}
else
#endif /* MBEDTLS_GCM_C */
#if defined(MBEDTLS_CCM_C)
if( operation.core_alg == PSA_ALG_CCM )
{
status = mbedtls_to_psa_error(
mbedtls_ccm_encrypt_and_tag( &operation.ctx.ccm,
plaintext_length,
nonce, nonce_length,
additional_data,
additional_data_length,
plaintext, ciphertext,
tag, operation.tag_length ) );
}
else
#endif /* MBEDTLS_CCM_C */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
if( status != PSA_SUCCESS && ciphertext_size != 0 )
memset( ciphertext, 0, ciphertext_size );
exit:
psa_aead_abort_internal( &operation );
if( status == PSA_SUCCESS )
*ciphertext_length = plaintext_length + operation.tag_length;
return( status );
}
/* Locate the tag in a ciphertext buffer containing the encrypted data
* followed by the tag. Return the length of the part preceding the tag in
* *plaintext_length. This is the size of the plaintext in modes where
* the encrypted data has the same size as the plaintext, such as
* CCM and GCM. */
static psa_status_t psa_aead_unpadded_locate_tag( size_t tag_length,
const uint8_t *ciphertext,
size_t ciphertext_length,
size_t plaintext_size,
const uint8_t **p_tag )
{
size_t payload_length;
if( tag_length > ciphertext_length )
return( PSA_ERROR_INVALID_ARGUMENT );
payload_length = ciphertext_length - tag_length;
if( payload_length > plaintext_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
*p_tag = ciphertext + payload_length;
return( PSA_SUCCESS );
}
psa_status_t psa_aead_decrypt( psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *nonce,
size_t nonce_length,
const uint8_t *additional_data,
size_t additional_data_length,
const uint8_t *ciphertext,
size_t ciphertext_length,
uint8_t *plaintext,
size_t plaintext_size,
size_t *plaintext_length )
{
psa_status_t status;
aead_operation_t operation;
const uint8_t *tag = NULL;
*plaintext_length = 0;
status = psa_aead_setup( &operation, handle, PSA_KEY_USAGE_DECRYPT, alg );
if( status != PSA_SUCCESS )
return( status );
#if defined(MBEDTLS_GCM_C)
if( operation.core_alg == PSA_ALG_GCM )
{
status = psa_aead_unpadded_locate_tag( operation.tag_length,
ciphertext, ciphertext_length,
plaintext_size, &tag );
if( status != PSA_SUCCESS )
goto exit;
status = mbedtls_to_psa_error(
mbedtls_gcm_auth_decrypt( &operation.ctx.gcm,
ciphertext_length - operation.tag_length,
nonce, nonce_length,
additional_data,
additional_data_length,
tag, operation.tag_length,
ciphertext, plaintext ) );
}
else
#endif /* MBEDTLS_GCM_C */
#if defined(MBEDTLS_CCM_C)
if( operation.core_alg == PSA_ALG_CCM )
{
status = psa_aead_unpadded_locate_tag( operation.tag_length,
ciphertext, ciphertext_length,
plaintext_size, &tag );
if( status != PSA_SUCCESS )
goto exit;
status = mbedtls_to_psa_error(
mbedtls_ccm_auth_decrypt( &operation.ctx.ccm,
ciphertext_length - operation.tag_length,
nonce, nonce_length,
additional_data,
additional_data_length,
ciphertext, plaintext,
tag, operation.tag_length ) );
}
else
#endif /* MBEDTLS_CCM_C */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
if( status != PSA_SUCCESS && plaintext_size != 0 )
memset( plaintext, 0, plaintext_size );
exit:
psa_aead_abort_internal( &operation );
if( status == PSA_SUCCESS )
*plaintext_length = ciphertext_length - operation.tag_length;
return( status );
}
/****************************************************************/
/* Generators */
/****************************************************************/
#define HKDF_STATE_INIT 0 /* no input yet */
#define HKDF_STATE_STARTED 1 /* got salt */
#define HKDF_STATE_KEYED 2 /* got key */
#define HKDF_STATE_OUTPUT 3 /* output started */
static psa_algorithm_t psa_generator_get_kdf_alg(
const psa_crypto_generator_t *generator )
{
if ( PSA_ALG_IS_KEY_AGREEMENT( generator->alg ) )
return( PSA_ALG_KEY_AGREEMENT_GET_KDF( generator->alg ) );
else
return( generator->alg );
}
psa_status_t psa_generator_abort( psa_crypto_generator_t *generator )
{
psa_status_t status = PSA_SUCCESS;
psa_algorithm_t kdf_alg = psa_generator_get_kdf_alg( generator );
if( kdf_alg == 0 )
{
/* The object has (apparently) been initialized but it is not
* in use. It's ok to call abort on such an object, and there's
* nothing to do. */
}
else
if( kdf_alg == PSA_ALG_SELECT_RAW )
{
if( generator->ctx.buffer.data != NULL )
{
mbedtls_platform_zeroize( generator->ctx.buffer.data,
generator->ctx.buffer.size );
mbedtls_free( generator->ctx.buffer.data );
}
}
else
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HKDF( kdf_alg ) )
{
mbedtls_free( generator->ctx.hkdf.info );
status = psa_hmac_abort_internal( &generator->ctx.hkdf.hmac );
}
else if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
/* TLS-1.2 PSK-to-MS KDF uses the same generator as TLS-1.2 PRF */
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
{
if( generator->ctx.tls12_prf.key != NULL )
{
mbedtls_platform_zeroize( generator->ctx.tls12_prf.key,
generator->ctx.tls12_prf.key_len );
mbedtls_free( generator->ctx.tls12_prf.key );
}
if( generator->ctx.tls12_prf.Ai_with_seed != NULL )
{
mbedtls_platform_zeroize( generator->ctx.tls12_prf.Ai_with_seed,
generator->ctx.tls12_prf.Ai_with_seed_len );
mbedtls_free( generator->ctx.tls12_prf.Ai_with_seed );
}
}
else
#endif /* MBEDTLS_MD_C */
{
status = PSA_ERROR_BAD_STATE;
}
memset( generator, 0, sizeof( *generator ) );
return( status );
}
psa_status_t psa_get_generator_capacity(const psa_crypto_generator_t *generator,
size_t *capacity)
{
if( generator->alg == 0 )
{
/* This is a blank generator. */
return PSA_ERROR_BAD_STATE;
}
*capacity = generator->capacity;
return( PSA_SUCCESS );
}
psa_status_t psa_set_generator_capacity( psa_crypto_generator_t *generator,
size_t capacity )
{
if( generator->alg == 0 )
return( PSA_ERROR_BAD_STATE );
if( capacity > generator->capacity )
return( PSA_ERROR_INVALID_ARGUMENT );
generator->capacity = capacity;
return( PSA_SUCCESS );
}
#if defined(MBEDTLS_MD_C)
/* Read some bytes from an HKDF-based generator. This performs a chunk
* of the expand phase of the HKDF algorithm. */
static psa_status_t psa_generator_hkdf_read( psa_hkdf_generator_t *hkdf,
psa_algorithm_t hash_alg,
uint8_t *output,
size_t output_length )
{
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
psa_status_t status;
if( hkdf->state < HKDF_STATE_KEYED || ! hkdf->info_set )
return( PSA_ERROR_BAD_STATE );
hkdf->state = HKDF_STATE_OUTPUT;
while( output_length != 0 )
{
/* Copy what remains of the current block */
uint8_t n = hash_length - hkdf->offset_in_block;
if( n > output_length )
n = (uint8_t) output_length;
memcpy( output, hkdf->output_block + hkdf->offset_in_block, n );
output += n;
output_length -= n;
hkdf->offset_in_block += n;
if( output_length == 0 )
break;
/* We can't be wanting more output after block 0xff, otherwise
* the capacity check in psa_generator_read() would have
* prevented this call. It could happen only if the generator
* object was corrupted or if this function is called directly
* inside the library. */
if( hkdf->block_number == 0xff )
return( PSA_ERROR_BAD_STATE );
/* We need a new block */
++hkdf->block_number;
hkdf->offset_in_block = 0;
status = psa_hmac_setup_internal( &hkdf->hmac,
hkdf->prk, hash_length,
hash_alg );
if( status != PSA_SUCCESS )
return( status );
if( hkdf->block_number != 1 )
{
status = psa_hash_update( &hkdf->hmac.hash_ctx,
hkdf->output_block,
hash_length );
if( status != PSA_SUCCESS )
return( status );
}
status = psa_hash_update( &hkdf->hmac.hash_ctx,
hkdf->info,
hkdf->info_length );
if( status != PSA_SUCCESS )
return( status );
status = psa_hash_update( &hkdf->hmac.hash_ctx,
&hkdf->block_number, 1 );
if( status != PSA_SUCCESS )
return( status );
status = psa_hmac_finish_internal( &hkdf->hmac,
hkdf->output_block,
sizeof( hkdf->output_block ) );
if( status != PSA_SUCCESS )
return( status );
}
return( PSA_SUCCESS );
}
static psa_status_t psa_generator_tls12_prf_generate_next_block(
psa_tls12_prf_generator_t *tls12_prf,
psa_algorithm_t alg )
{
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( alg );
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
psa_hmac_internal_data hmac;
psa_status_t status, cleanup_status;
unsigned char *Ai;
size_t Ai_len;
/* We can't be wanting more output after block 0xff, otherwise
* the capacity check in psa_generator_read() would have
* prevented this call. It could happen only if the generator
* object was corrupted or if this function is called directly
* inside the library. */
if( tls12_prf->block_number == 0xff )
return( PSA_ERROR_BAD_STATE );
/* We need a new block */
++tls12_prf->block_number;
tls12_prf->offset_in_block = 0;
/* Recall the definition of the TLS-1.2-PRF from RFC 5246:
*
* PRF(secret, label, seed) = P_<hash>(secret, label + seed)
*
* P_hash(secret, seed) = HMAC_hash(secret, A(1) + seed) +
* HMAC_hash(secret, A(2) + seed) +
* HMAC_hash(secret, A(3) + seed) + ...
*
* A(0) = seed
* A(i) = HMAC_hash( secret, A(i-1) )
*
* The `psa_tls12_prf_generator` structures saves the block
* `HMAC_hash(secret, A(i) + seed)` from which the output
* is currently extracted as `output_block`, while
* `A(i) + seed` is stored in `Ai_with_seed`.
*
* Generating a new block means recalculating `Ai_with_seed`
* from the A(i)-part of it, and afterwards recalculating
* `output_block`.
*
* A(0) is computed at setup time.
*
*/
psa_hmac_init_internal( &hmac );
/* We must distinguish the calculation of A(1) from those
* of A(2) and higher, because A(0)=seed has a different
* length than the other A(i). */
if( tls12_prf->block_number == 1 )
{
Ai = tls12_prf->Ai_with_seed + hash_length;
Ai_len = tls12_prf->Ai_with_seed_len - hash_length;
}
else
{
Ai = tls12_prf->Ai_with_seed;
Ai_len = hash_length;
}
/* Compute A(i+1) = HMAC_hash(secret, A(i)) */
status = psa_hmac_setup_internal( &hmac,
tls12_prf->key,
tls12_prf->key_len,
hash_alg );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hash_update( &hmac.hash_ctx,
Ai, Ai_len );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hmac_finish_internal( &hmac,
tls12_prf->Ai_with_seed,
hash_length );
if( status != PSA_SUCCESS )
goto cleanup;
/* Compute the next block `HMAC_hash(secret, A(i+1) + seed)`. */
status = psa_hmac_setup_internal( &hmac,
tls12_prf->key,
tls12_prf->key_len,
hash_alg );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hash_update( &hmac.hash_ctx,
tls12_prf->Ai_with_seed,
tls12_prf->Ai_with_seed_len );
if( status != PSA_SUCCESS )
goto cleanup;
status = psa_hmac_finish_internal( &hmac,
tls12_prf->output_block,
hash_length );
if( status != PSA_SUCCESS )
goto cleanup;
cleanup:
cleanup_status = psa_hmac_abort_internal( &hmac );
if( status == PSA_SUCCESS && cleanup_status != PSA_SUCCESS )
status = cleanup_status;
return( status );
}
/* Read some bytes from an TLS-1.2-PRF-based generator.
* See Section 5 of RFC 5246. */
static psa_status_t psa_generator_tls12_prf_read(
psa_tls12_prf_generator_t *tls12_prf,
psa_algorithm_t alg,
uint8_t *output,
size_t output_length )
{
psa_algorithm_t hash_alg = PSA_ALG_TLS12_PRF_GET_HASH( alg );
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
psa_status_t status;
while( output_length != 0 )
{
/* Copy what remains of the current block */
uint8_t n = hash_length - tls12_prf->offset_in_block;
/* Check if we have fully processed the current block. */
if( n == 0 )
{
status = psa_generator_tls12_prf_generate_next_block( tls12_prf,
alg );
if( status != PSA_SUCCESS )
return( status );
continue;
}
if( n > output_length )
n = (uint8_t) output_length;
memcpy( output, tls12_prf->output_block + tls12_prf->offset_in_block,
n );
output += n;
output_length -= n;
tls12_prf->offset_in_block += n;
}
return( PSA_SUCCESS );
}
#endif /* MBEDTLS_MD_C */
psa_status_t psa_generator_read( psa_crypto_generator_t *generator,
uint8_t *output,
size_t output_length )
{
psa_status_t status;
psa_algorithm_t kdf_alg = psa_generator_get_kdf_alg( generator );
if( generator->alg == 0 )
{
/* This is a blank generator. */
return PSA_ERROR_BAD_STATE;
}
if( output_length > generator->capacity )
{
generator->capacity = 0;
/* Go through the error path to wipe all confidential data now
* that the generator object is useless. */
status = PSA_ERROR_INSUFFICIENT_DATA;
goto exit;
}
if( output_length == 0 && generator->capacity == 0 )
{
/* Edge case: this is a finished generator, and 0 bytes
* were requested. The right error in this case could
* be either INSUFFICIENT_CAPACITY or BAD_STATE. Return
* INSUFFICIENT_CAPACITY, which is right for a finished
* generator, for consistency with the case when
* output_length > 0. */
return( PSA_ERROR_INSUFFICIENT_DATA );
}
generator->capacity -= output_length;
if( kdf_alg == PSA_ALG_SELECT_RAW )
{
/* Initially, the capacity of a selection generator is always
* the size of the buffer, i.e. `generator->ctx.buffer.size`,
* abbreviated in this comment as `size`. When the remaining
* capacity is `c`, the next bytes to serve start `c` bytes
* from the end of the buffer, i.e. `size - c` from the
* beginning of the buffer. Since `generator->capacity` was just
* decremented above, we need to serve the bytes from
* `size - generator->capacity - output_length` to
* `size - generator->capacity`. */
size_t offset =
generator->ctx.buffer.size - generator->capacity - output_length;
memcpy( output, generator->ctx.buffer.data + offset, output_length );
status = PSA_SUCCESS;
}
else
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HKDF( kdf_alg ) )
{
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( kdf_alg );
status = psa_generator_hkdf_read( &generator->ctx.hkdf, hash_alg,
output, output_length );
}
else if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
{
status = psa_generator_tls12_prf_read( &generator->ctx.tls12_prf,
kdf_alg, output,
output_length );
}
else
#endif /* MBEDTLS_MD_C */
{
return( PSA_ERROR_BAD_STATE );
}
exit:
if( status != PSA_SUCCESS )
{
/* Preserve the algorithm upon errors, but clear all sensitive state.
* This allows us to differentiate between exhausted generators and
* blank generators, so we can return PSA_ERROR_BAD_STATE on blank
* generators. */
psa_algorithm_t alg = generator->alg;
psa_generator_abort( generator );
generator->alg = alg;
memset( output, '!', output_length );
}
return( status );
}
#if defined(MBEDTLS_DES_C)
static void psa_des_set_key_parity( uint8_t *data, size_t data_size )
{
if( data_size >= 8 )
mbedtls_des_key_set_parity( data );
if( data_size >= 16 )
mbedtls_des_key_set_parity( data + 8 );
if( data_size >= 24 )
mbedtls_des_key_set_parity( data + 16 );
}
#endif /* MBEDTLS_DES_C */
static psa_status_t psa_generate_derived_key_internal(
psa_key_slot_t *slot,
size_t bits,
psa_crypto_generator_t *generator )
{
uint8_t *data = NULL;
size_t bytes = PSA_BITS_TO_BYTES( bits );
psa_status_t status;
if( ! key_type_is_raw_bytes( slot->type ) )
return( PSA_ERROR_INVALID_ARGUMENT );
if( bits % 8 != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
data = mbedtls_calloc( 1, bytes );
if( data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_generator_read( generator, data, bytes );
if( status != PSA_SUCCESS )
goto exit;
#if defined(MBEDTLS_DES_C)
if( slot->type == PSA_KEY_TYPE_DES )
psa_des_set_key_parity( data, bytes );
#endif /* MBEDTLS_DES_C */
status = psa_import_key_into_slot( slot, data, bytes );
exit:
mbedtls_free( data );
return( status );
}
psa_status_t psa_generate_derived_key( const psa_key_attributes_t *attributes,
psa_crypto_generator_t *generator,
psa_key_handle_t *handle )
{
psa_status_t status;
psa_key_slot_t *slot = NULL;
status = psa_start_key_creation( attributes, handle, &slot );
if( status == PSA_SUCCESS )
{
status = psa_generate_derived_key_internal( slot,
attributes->bits,
generator );
}
if( status == PSA_SUCCESS )
status = psa_finish_key_creation( slot );
if( status != PSA_SUCCESS )
{
psa_fail_key_creation( slot );
*handle = 0;
}
return( status );
}
psa_status_t psa_generate_derived_key_to_handle( psa_key_handle_t handle,
psa_key_type_t type,
size_t bits,
psa_crypto_generator_t *generator )
{
uint8_t *data = NULL;
size_t bytes = PSA_BITS_TO_BYTES( bits );
psa_status_t status;
if( ! key_type_is_raw_bytes( type ) )
return( PSA_ERROR_INVALID_ARGUMENT );
if( bits % 8 != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
data = mbedtls_calloc( 1, bytes );
if( data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_generator_read( generator, data, bytes );
if( status != PSA_SUCCESS )
goto exit;
#if defined(MBEDTLS_DES_C)
if( type == PSA_KEY_TYPE_DES )
psa_des_set_key_parity( data, bytes );
#endif /* MBEDTLS_DES_C */
status = psa_import_key_to_handle( handle, type, data, bytes );
exit:
mbedtls_free( data );
return( status );
}
/****************************************************************/
/* Key derivation */
/****************************************************************/
#if defined(MBEDTLS_MD_C)
/* Set up an HKDF-based generator. This is exactly the extract phase
* of the HKDF algorithm.
*
* Note that if this function fails, you must call psa_generator_abort()
* to potentially free embedded data structures and wipe confidential data.
*/
static psa_status_t psa_generator_hkdf_setup( psa_hkdf_generator_t *hkdf,
const uint8_t *secret,
size_t secret_length,
psa_algorithm_t hash_alg,
const uint8_t *salt,
size_t salt_length,
const uint8_t *label,
size_t label_length )
{
psa_status_t status;
status = psa_hmac_setup_internal( &hkdf->hmac,
salt, salt_length,
hash_alg );
if( status != PSA_SUCCESS )
return( status );
status = psa_hash_update( &hkdf->hmac.hash_ctx, secret, secret_length );
if( status != PSA_SUCCESS )
return( status );
status = psa_hmac_finish_internal( &hkdf->hmac,
hkdf->prk,
sizeof( hkdf->prk ) );
if( status != PSA_SUCCESS )
return( status );
hkdf->offset_in_block = PSA_HASH_SIZE( hash_alg );
hkdf->block_number = 0;
hkdf->info_length = label_length;
if( label_length != 0 )
{
hkdf->info = mbedtls_calloc( 1, label_length );
if( hkdf->info == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
memcpy( hkdf->info, label, label_length );
}
hkdf->state = HKDF_STATE_KEYED;
hkdf->info_set = 1;
return( PSA_SUCCESS );
}
#endif /* MBEDTLS_MD_C */
#if defined(MBEDTLS_MD_C)
/* Set up a TLS-1.2-prf-based generator (see RFC 5246, Section 5).
*
* Note that if this function fails, you must call psa_generator_abort()
* to potentially free embedded data structures and wipe confidential data.
*/
static psa_status_t psa_generator_tls12_prf_setup(
psa_tls12_prf_generator_t *tls12_prf,
const unsigned char *key,
size_t key_len,
psa_algorithm_t hash_alg,
const uint8_t *salt,
size_t salt_length,
const uint8_t *label,
size_t label_length )
{
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
size_t Ai_with_seed_len = hash_length + salt_length + label_length;
int overflow;
tls12_prf->key = mbedtls_calloc( 1, key_len );
if( tls12_prf->key == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
tls12_prf->key_len = key_len;
memcpy( tls12_prf->key, key, key_len );
overflow = ( salt_length + label_length < salt_length ) ||
( salt_length + label_length + hash_length < hash_length );
if( overflow )
return( PSA_ERROR_INVALID_ARGUMENT );
tls12_prf->Ai_with_seed = mbedtls_calloc( 1, Ai_with_seed_len );
if( tls12_prf->Ai_with_seed == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
tls12_prf->Ai_with_seed_len = Ai_with_seed_len;
/* Write `label + seed' at the end of the `A(i) + seed` buffer,
* leaving the initial `hash_length` bytes unspecified for now. */
if( label_length != 0 )
{
memcpy( tls12_prf->Ai_with_seed + hash_length,
label, label_length );
}
if( salt_length != 0 )
{
memcpy( tls12_prf->Ai_with_seed + hash_length + label_length,
salt, salt_length );
}
/* The first block gets generated when
* psa_generator_read() is called. */
tls12_prf->block_number = 0;
tls12_prf->offset_in_block = hash_length;
return( PSA_SUCCESS );
}
/* Set up a TLS-1.2-PSK-to-MS-based generator. */
static psa_status_t psa_generator_tls12_psk_to_ms_setup(
psa_tls12_prf_generator_t *tls12_prf,
const unsigned char *psk,
size_t psk_len,
psa_algorithm_t hash_alg,
const uint8_t *salt,
size_t salt_length,
const uint8_t *label,
size_t label_length )
{
psa_status_t status;
unsigned char pms[ 4 + 2 * PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN ];
if( psk_len > PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN )
return( PSA_ERROR_INVALID_ARGUMENT );
/* Quoting RFC 4279, Section 2:
*
* The premaster secret is formed as follows: if the PSK is N octets
* long, concatenate a uint16 with the value N, N zero octets, a second
* uint16 with the value N, and the PSK itself.
*/
pms[0] = ( psk_len >> 8 ) & 0xff;
pms[1] = ( psk_len >> 0 ) & 0xff;
memset( pms + 2, 0, psk_len );
pms[2 + psk_len + 0] = pms[0];
pms[2 + psk_len + 1] = pms[1];
memcpy( pms + 4 + psk_len, psk, psk_len );
status = psa_generator_tls12_prf_setup( tls12_prf,
pms, 4 + 2 * psk_len,
hash_alg,
salt, salt_length,
label, label_length );
mbedtls_platform_zeroize( pms, sizeof( pms ) );
return( status );
}
#endif /* MBEDTLS_MD_C */
/* Note that if this function fails, you must call psa_generator_abort()
* to potentially free embedded data structures and wipe confidential data.
*/
static psa_status_t psa_key_derivation_internal(
psa_crypto_generator_t *generator,
const uint8_t *secret, size_t secret_length,
psa_algorithm_t alg,
const uint8_t *salt, size_t salt_length,
const uint8_t *label, size_t label_length,
size_t capacity )
{
psa_status_t status;
size_t max_capacity;
/* Set generator->alg even on failure so that abort knows what to do. */
generator->alg = alg;
if( alg == PSA_ALG_SELECT_RAW )
{
(void) salt;
if( salt_length != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
(void) label;
if( label_length != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
generator->ctx.buffer.data = mbedtls_calloc( 1, secret_length );
if( generator->ctx.buffer.data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
memcpy( generator->ctx.buffer.data, secret, secret_length );
generator->ctx.buffer.size = secret_length;
max_capacity = secret_length;
status = PSA_SUCCESS;
}
else
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HKDF( alg ) )
{
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( alg );
size_t hash_size = PSA_HASH_SIZE( hash_alg );
if( hash_size == 0 )
return( PSA_ERROR_NOT_SUPPORTED );
max_capacity = 255 * hash_size;
status = psa_generator_hkdf_setup( &generator->ctx.hkdf,
secret, secret_length,
hash_alg,
salt, salt_length,
label, label_length );
}
/* TLS-1.2 PRF and TLS-1.2 PSK-to-MS are very similar, so share code. */
else if( PSA_ALG_IS_TLS12_PRF( alg ) ||
PSA_ALG_IS_TLS12_PSK_TO_MS( alg ) )
{
psa_algorithm_t hash_alg = PSA_ALG_TLS12_PRF_GET_HASH( alg );
size_t hash_size = PSA_HASH_SIZE( hash_alg );
/* TLS-1.2 PRF supports only SHA-256 and SHA-384. */
if( hash_alg != PSA_ALG_SHA_256 &&
hash_alg != PSA_ALG_SHA_384 )
{
return( PSA_ERROR_NOT_SUPPORTED );
}
max_capacity = 255 * hash_size;
if( PSA_ALG_IS_TLS12_PRF( alg ) )
{
status = psa_generator_tls12_prf_setup( &generator->ctx.tls12_prf,
secret, secret_length,
hash_alg, salt, salt_length,
label, label_length );
}
else
{
status = psa_generator_tls12_psk_to_ms_setup(
&generator->ctx.tls12_prf,
secret, secret_length,
hash_alg, salt, salt_length,
label, label_length );
}
}
else
#endif
{
return( PSA_ERROR_NOT_SUPPORTED );
}
if( status != PSA_SUCCESS )
return( status );
if( capacity <= max_capacity )
generator->capacity = capacity;
else if( capacity == PSA_GENERATOR_UNBRIDLED_CAPACITY )
generator->capacity = max_capacity;
else
return( PSA_ERROR_INVALID_ARGUMENT );
return( PSA_SUCCESS );
}
psa_status_t psa_key_derivation( psa_crypto_generator_t *generator,
psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *salt,
size_t salt_length,
const uint8_t *label,
size_t label_length,
size_t capacity )
{
psa_key_slot_t *slot;
psa_status_t status;
if( generator->alg != 0 )
return( PSA_ERROR_BAD_STATE );
/* Make sure that alg is a key derivation algorithm. This prevents
* key selection algorithms, which psa_key_derivation_internal
* accepts for the sake of key agreement. */
if( ! PSA_ALG_IS_KEY_DERIVATION( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_get_key_from_slot( handle, &slot, PSA_KEY_USAGE_DERIVE, alg );
if( status != PSA_SUCCESS )
return( status );
if( slot->type != PSA_KEY_TYPE_DERIVE )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_key_derivation_internal( generator,
slot->data.raw.data,
slot->data.raw.bytes,
alg,
salt, salt_length,
label, label_length,
capacity );
if( status != PSA_SUCCESS )
psa_generator_abort( generator );
return( status );
}
static psa_status_t psa_key_derivation_setup_kdf(
psa_crypto_generator_t *generator,
psa_algorithm_t kdf_alg )
{
/* Make sure that kdf_alg is a supported key derivation algorithm. */
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HKDF( kdf_alg ) ||
PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
{
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( kdf_alg );
size_t hash_size = PSA_HASH_SIZE( hash_alg );
if( hash_size == 0 )
return( PSA_ERROR_NOT_SUPPORTED );
if( ( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) ) &&
! ( hash_alg == PSA_ALG_SHA_256 || hash_alg == PSA_ALG_SHA_384 ) )
{
return( PSA_ERROR_NOT_SUPPORTED );
}
generator->capacity = 255 * hash_size;
return( PSA_SUCCESS );
}
#endif /* MBEDTLS_MD_C */
else
return( PSA_ERROR_NOT_SUPPORTED );
}
psa_status_t psa_key_derivation_setup( psa_crypto_generator_t *generator,
psa_algorithm_t alg )
{
psa_status_t status;
if( generator->alg != 0 )
return( PSA_ERROR_BAD_STATE );
if( PSA_ALG_IS_RAW_KEY_AGREEMENT( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
else if( PSA_ALG_IS_KEY_AGREEMENT( alg ) )
{
psa_algorithm_t kdf_alg = PSA_ALG_KEY_AGREEMENT_GET_KDF( alg );
status = psa_key_derivation_setup_kdf( generator, kdf_alg );
}
else if( PSA_ALG_IS_KEY_DERIVATION( alg ) )
{
status = psa_key_derivation_setup_kdf( generator, alg );
}
else
return( PSA_ERROR_INVALID_ARGUMENT );
if( status == PSA_SUCCESS )
generator->alg = alg;
return( status );
}
#if defined(MBEDTLS_MD_C)
static psa_status_t psa_hkdf_input( psa_hkdf_generator_t *hkdf,
psa_algorithm_t hash_alg,
psa_key_derivation_step_t step,
const uint8_t *data,
size_t data_length )
{
psa_status_t status;
switch( step )
{
case PSA_KDF_STEP_SALT:
if( hkdf->state != HKDF_STATE_INIT )
return( PSA_ERROR_BAD_STATE );
status = psa_hmac_setup_internal( &hkdf->hmac,
data, data_length,
hash_alg );
if( status != PSA_SUCCESS )
return( status );
hkdf->state = HKDF_STATE_STARTED;
return( PSA_SUCCESS );
case PSA_KDF_STEP_SECRET:
/* If no salt was provided, use an empty salt. */
if( hkdf->state == HKDF_STATE_INIT )
{
status = psa_hmac_setup_internal( &hkdf->hmac,
NULL, 0,
hash_alg );
if( status != PSA_SUCCESS )
return( status );
hkdf->state = HKDF_STATE_STARTED;
}
if( hkdf->state != HKDF_STATE_STARTED )
return( PSA_ERROR_BAD_STATE );
status = psa_hash_update( &hkdf->hmac.hash_ctx,
data, data_length );
if( status != PSA_SUCCESS )
return( status );
status = psa_hmac_finish_internal( &hkdf->hmac,
hkdf->prk,
sizeof( hkdf->prk ) );
if( status != PSA_SUCCESS )
return( status );
hkdf->offset_in_block = PSA_HASH_SIZE( hash_alg );
hkdf->block_number = 0;
hkdf->state = HKDF_STATE_KEYED;
return( PSA_SUCCESS );
case PSA_KDF_STEP_INFO:
if( hkdf->state == HKDF_STATE_OUTPUT )
return( PSA_ERROR_BAD_STATE );
if( hkdf->info_set )
return( PSA_ERROR_BAD_STATE );
hkdf->info_length = data_length;
if( data_length != 0 )
{
hkdf->info = mbedtls_calloc( 1, data_length );
if( hkdf->info == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
memcpy( hkdf->info, data, data_length );
}
hkdf->info_set = 1;
return( PSA_SUCCESS );
default:
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
#endif /* MBEDTLS_MD_C */
static psa_status_t psa_key_derivation_input_raw(
psa_crypto_generator_t *generator,
psa_key_derivation_step_t step,
const uint8_t *data,
size_t data_length )
{
psa_status_t status;
psa_algorithm_t kdf_alg = psa_generator_get_kdf_alg( generator );
if( kdf_alg == PSA_ALG_SELECT_RAW )
{
if( generator->capacity != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
generator->ctx.buffer.data = mbedtls_calloc( 1, data_length );
if( generator->ctx.buffer.data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
memcpy( generator->ctx.buffer.data, data, data_length );
generator->ctx.buffer.size = data_length;
generator->capacity = data_length;
status = PSA_SUCCESS;
}
else
#if defined(MBEDTLS_MD_C)
if( PSA_ALG_IS_HKDF( kdf_alg ) )
{
status = psa_hkdf_input( &generator->ctx.hkdf,
PSA_ALG_HKDF_GET_HASH( kdf_alg ),
step, data, data_length );
}
else
#endif /* MBEDTLS_MD_C */
#if defined(MBEDTLS_MD_C)
/* TLS-1.2 PRF and TLS-1.2 PSK-to-MS are very similar, so share code. */
if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
{
// To do: implement this
status = PSA_ERROR_NOT_SUPPORTED;
}
else
#endif /* MBEDTLS_MD_C */
{
/* This can't happen unless the generator object was not initialized */
return( PSA_ERROR_BAD_STATE );
}
if( status != PSA_SUCCESS )
psa_generator_abort( generator );
return( status );
}
psa_status_t psa_key_derivation_input_bytes( psa_crypto_generator_t *generator,
psa_key_derivation_step_t step,
const uint8_t *data,
size_t data_length )
{
switch( step )
{
case PSA_KDF_STEP_LABEL:
case PSA_KDF_STEP_SALT:
case PSA_KDF_STEP_INFO:
return( psa_key_derivation_input_raw( generator, step,
data, data_length ) );
default:
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
psa_status_t psa_key_derivation_input_key( psa_crypto_generator_t *generator,
psa_key_derivation_step_t step,
psa_key_handle_t handle )
{
psa_key_slot_t *slot;
psa_status_t status;
status = psa_get_key_from_slot( handle, &slot,
PSA_KEY_USAGE_DERIVE,
generator->alg );
if( status != PSA_SUCCESS )
return( status );
if( slot->type != PSA_KEY_TYPE_DERIVE )
return( PSA_ERROR_INVALID_ARGUMENT );
/* Don't allow a key to be used as an input that is usually public.
* This is debatable. It's ok from a cryptographic perspective to
* use secret material as an input that is usually public. However
* the material should be dedicated to a particular input step,
* otherwise this may allow the key to be used in an unintended way
* and leak values derived from the key. So be conservative. */
if( step != PSA_KDF_STEP_SECRET )
return( PSA_ERROR_INVALID_ARGUMENT );
return( psa_key_derivation_input_raw( generator,
step,
slot->data.raw.data,
slot->data.raw.bytes ) );
}
/****************************************************************/
/* Key agreement */
/****************************************************************/
#if defined(MBEDTLS_ECDH_C)
static psa_status_t psa_key_agreement_ecdh( const uint8_t *peer_key,
size_t peer_key_length,
const mbedtls_ecp_keypair *our_key,
uint8_t *shared_secret,
size_t shared_secret_size,
size_t *shared_secret_length )
{
mbedtls_ecp_keypair *their_key = NULL;
mbedtls_ecdh_context ecdh;
psa_status_t status;
mbedtls_ecdh_init( &ecdh );
status = psa_import_ec_public_key(
mbedtls_ecc_group_to_psa( our_key->grp.id ),
peer_key, peer_key_length,
&their_key );
if( status != PSA_SUCCESS )
goto exit;
status = mbedtls_to_psa_error(
mbedtls_ecdh_get_params( &ecdh, their_key, MBEDTLS_ECDH_THEIRS ) );
if( status != PSA_SUCCESS )
goto exit;
status = mbedtls_to_psa_error(
mbedtls_ecdh_get_params( &ecdh, our_key, MBEDTLS_ECDH_OURS ) );
if( status != PSA_SUCCESS )
goto exit;
status = mbedtls_to_psa_error(
mbedtls_ecdh_calc_secret( &ecdh,
shared_secret_length,
shared_secret, shared_secret_size,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg ) );
exit:
mbedtls_ecdh_free( &ecdh );
mbedtls_ecp_keypair_free( their_key );
mbedtls_free( their_key );
return( status );
}
#endif /* MBEDTLS_ECDH_C */
#define PSA_KEY_AGREEMENT_MAX_SHARED_SECRET_SIZE MBEDTLS_ECP_MAX_BYTES
static psa_status_t psa_key_agreement_raw_internal( psa_algorithm_t alg,
psa_key_slot_t *private_key,
const uint8_t *peer_key,
size_t peer_key_length,
uint8_t *shared_secret,
size_t shared_secret_size,
size_t *shared_secret_length )
{
switch( alg )
{
#if defined(MBEDTLS_ECDH_C)
case PSA_ALG_ECDH:
if( ! PSA_KEY_TYPE_IS_ECC_KEYPAIR( private_key->type ) )
return( PSA_ERROR_INVALID_ARGUMENT );
return( psa_key_agreement_ecdh( peer_key, peer_key_length,
private_key->data.ecp,
shared_secret, shared_secret_size,
shared_secret_length ) );
#endif /* MBEDTLS_ECDH_C */
default:
(void) private_key;
(void) peer_key;
(void) peer_key_length;
(void) shared_secret;
(void) shared_secret_size;
(void) shared_secret_length;
return( PSA_ERROR_NOT_SUPPORTED );
}
}
/* Note that if this function fails, you must call psa_generator_abort()
* to potentially free embedded data structures and wipe confidential data.
*/
static psa_status_t psa_key_agreement_internal( psa_crypto_generator_t *generator,
psa_key_derivation_step_t step,
psa_key_slot_t *private_key,
const uint8_t *peer_key,
size_t peer_key_length )
{
psa_status_t status;
uint8_t shared_secret[PSA_KEY_AGREEMENT_MAX_SHARED_SECRET_SIZE];
size_t shared_secret_length = 0;
psa_algorithm_t ka_alg = PSA_ALG_KEY_AGREEMENT_GET_BASE( generator->alg );
/* Step 1: run the secret agreement algorithm to generate the shared
* secret. */
status = psa_key_agreement_raw_internal( ka_alg,
private_key,
peer_key, peer_key_length,
shared_secret,
sizeof( shared_secret ),
&shared_secret_length );
if( status != PSA_SUCCESS )
goto exit;
/* Step 2: set up the key derivation to generate key material from
* the shared secret. */
status = psa_key_derivation_input_raw( generator, step,
shared_secret, shared_secret_length );
exit:
mbedtls_platform_zeroize( shared_secret, shared_secret_length );
return( status );
}
psa_status_t psa_key_agreement( psa_crypto_generator_t *generator,
psa_key_derivation_step_t step,
psa_key_handle_t private_key,
const uint8_t *peer_key,
size_t peer_key_length )
{
psa_key_slot_t *slot;
psa_status_t status;
if( ! PSA_ALG_IS_KEY_AGREEMENT( generator->alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_get_key_from_slot( private_key, &slot,
PSA_KEY_USAGE_DERIVE, generator->alg );
if( status != PSA_SUCCESS )
return( status );
status = psa_key_agreement_internal( generator, step,
slot,
peer_key, peer_key_length );
if( status != PSA_SUCCESS )
psa_generator_abort( generator );
return( status );
}
psa_status_t psa_key_agreement_raw_shared_secret( psa_algorithm_t alg,
psa_key_handle_t private_key,
const uint8_t *peer_key,
size_t peer_key_length,
uint8_t *output,
size_t output_size,
size_t *output_length )
{
psa_key_slot_t *slot;
psa_status_t status;
if( ! PSA_ALG_IS_KEY_AGREEMENT( alg ) )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
status = psa_get_key_from_slot( private_key, &slot,
PSA_KEY_USAGE_DERIVE, alg );
if( status != PSA_SUCCESS )
goto exit;
status = psa_key_agreement_raw_internal( alg, slot,
peer_key, peer_key_length,
output, output_size,
output_length );
exit:
if( status != PSA_SUCCESS )
{
/* If an error happens and is not handled properly, the output
* may be used as a key to protect sensitive data. Arrange for such
* a key to be random, which is likely to result in decryption or
* verification errors. This is better than filling the buffer with
* some constant data such as zeros, which would result in the data
* being protected with a reproducible, easily knowable key.
*/
psa_generate_random( output, output_size );
*output_length = output_size;
}
return( status );
}
/****************************************************************/
/* Random generation */
/****************************************************************/
psa_status_t psa_generate_random( uint8_t *output,
size_t output_size )
{
int ret;
GUARD_MODULE_INITIALIZED;
ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg, output, output_size );
return( mbedtls_to_psa_error( ret ) );
}
#if defined(MBEDTLS_PSA_INJECT_ENTROPY)
#include "mbedtls/entropy_poll.h"
psa_status_t mbedtls_psa_inject_entropy( const unsigned char *seed,
size_t seed_size )
{
if( global_data.initialized )
return( PSA_ERROR_NOT_PERMITTED );
if( ( ( seed_size < MBEDTLS_ENTROPY_MIN_PLATFORM ) ||
( seed_size < MBEDTLS_ENTROPY_BLOCK_SIZE ) ) ||
( seed_size > MBEDTLS_ENTROPY_MAX_SEED_SIZE ) )
return( PSA_ERROR_INVALID_ARGUMENT );
return( mbedtls_psa_storage_inject_entropy( seed, seed_size ) );
}
#endif /* MBEDTLS_PSA_INJECT_ENTROPY */
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
static psa_status_t psa_read_rsa_exponent( const uint8_t *domain_parameters,
size_t domain_parameters_size,
int *exponent )
{
size_t i;
uint32_t acc = 0;
if( domain_parameters_size == 0 )
{
*exponent = 65537;
return( PSA_SUCCESS );
}
/* Mbed TLS encodes the public exponent as an int. For simplicity, only
* support values that fit in a 32-bit integer, which is larger than
* int on just about every platform anyway. */
if( domain_parameters_size > sizeof( acc ) )
return( PSA_ERROR_NOT_SUPPORTED );
for( i = 0; i < domain_parameters_size; i++ )
acc = ( acc << 8 ) | domain_parameters[i];
if( acc > INT_MAX )
return( PSA_ERROR_NOT_SUPPORTED );
*exponent = acc;
return( PSA_SUCCESS );
}
#endif /* MBEDTLS_RSA_C && MBEDTLS_GENPRIME */
static psa_status_t psa_generate_random_key_internal(
psa_key_slot_t *slot, size_t bits,
const uint8_t *domain_parameters, size_t domain_parameters_size )
{
psa_key_type_t type = slot->type;
if( domain_parameters == NULL && domain_parameters_size != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
if( key_type_is_raw_bytes( type ) )
{
psa_status_t status;
status = prepare_raw_data_slot( type, bits, &slot->data.raw );
if( status != PSA_SUCCESS )
return( status );
status = psa_generate_random( slot->data.raw.data,
slot->data.raw.bytes );
if( status != PSA_SUCCESS )
{
mbedtls_free( slot->data.raw.data );
return( status );
}
#if defined(MBEDTLS_DES_C)
if( type == PSA_KEY_TYPE_DES )
psa_des_set_key_parity( slot->data.raw.data,
slot->data.raw.bytes );
#endif /* MBEDTLS_DES_C */
}
else
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
if ( type == PSA_KEY_TYPE_RSA_KEYPAIR )
{
mbedtls_rsa_context *rsa;
int ret;
int exponent;
psa_status_t status;
if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
return( PSA_ERROR_NOT_SUPPORTED );
/* Accept only byte-aligned keys, for the same reasons as
* in psa_import_rsa_key(). */
if( bits % 8 != 0 )
return( PSA_ERROR_NOT_SUPPORTED );
status = psa_read_rsa_exponent( domain_parameters,
domain_parameters_size,
&exponent );
if( status != PSA_SUCCESS )
return( status );
rsa = mbedtls_calloc( 1, sizeof( *rsa ) );
if( rsa == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
mbedtls_rsa_init( rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
ret = mbedtls_rsa_gen_key( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
(unsigned int) bits,
exponent );
if( ret != 0 )
{
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( mbedtls_to_psa_error( ret ) );
}
slot->data.rsa = rsa;
}
else
#endif /* MBEDTLS_RSA_C && MBEDTLS_GENPRIME */
#if defined(MBEDTLS_ECP_C)
if ( PSA_KEY_TYPE_IS_ECC( type ) && PSA_KEY_TYPE_IS_KEYPAIR( type ) )
{
psa_ecc_curve_t curve = PSA_KEY_TYPE_GET_CURVE( type );
mbedtls_ecp_group_id grp_id = mbedtls_ecc_group_of_psa( curve );
const mbedtls_ecp_curve_info *curve_info =
mbedtls_ecp_curve_info_from_grp_id( grp_id );
mbedtls_ecp_keypair *ecp;
int ret;
if( domain_parameters_size != 0 )
return( PSA_ERROR_NOT_SUPPORTED );
if( grp_id == MBEDTLS_ECP_DP_NONE || curve_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
if( curve_info->bit_size != bits )
return( PSA_ERROR_INVALID_ARGUMENT );
ecp = mbedtls_calloc( 1, sizeof( *ecp ) );
if( ecp == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
mbedtls_ecp_keypair_init( ecp );
ret = mbedtls_ecp_gen_key( grp_id, ecp,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg );
if( ret != 0 )
{
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
return( mbedtls_to_psa_error( ret ) );
}
slot->data.ecp = ecp;
}
else
#endif /* MBEDTLS_ECP_C */
return( PSA_ERROR_NOT_SUPPORTED );
return( PSA_SUCCESS );
}
psa_status_t psa_generate_random_key_to_handle( psa_key_handle_t handle,
psa_key_type_t type,
size_t bits,
const void *extra,
size_t extra_size )
{
psa_key_slot_t *slot;
psa_status_t status;
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
/* The old public exponent encoding is no longer supported. */
if( extra_size != 0 )
return( PSA_ERROR_NOT_SUPPORTED );
#endif
status = psa_get_empty_key_slot( handle, &slot );
if( status != PSA_SUCCESS )
return( status );
slot->type = type;
status = psa_generate_random_key_internal( slot, bits, extra, extra_size );
if( status != PSA_SUCCESS )
slot->type = 0;
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
if( slot->lifetime == PSA_KEY_LIFETIME_PERSISTENT )
{
return( psa_save_generated_persistent_key( slot, bits ) );
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
return( status );
}
psa_status_t psa_generate_random_key( const psa_key_attributes_t *attributes,
psa_key_handle_t *handle )
{
psa_status_t status;
psa_key_slot_t *slot = NULL;
status = psa_start_key_creation( attributes, handle, &slot );
if( status == PSA_SUCCESS )
{
status = psa_generate_random_key_internal(
slot, attributes->bits,
attributes->domain_parameters, attributes->domain_parameters_size );
}
if( status == PSA_SUCCESS )
status = psa_finish_key_creation( slot );
if( status != PSA_SUCCESS )
{
psa_fail_key_creation( slot );
*handle = 0;
}
return( status );
}
/****************************************************************/
/* Module setup */
/****************************************************************/
psa_status_t mbedtls_psa_crypto_configure_entropy_sources(
void (* entropy_init )( mbedtls_entropy_context *ctx ),
void (* entropy_free )( mbedtls_entropy_context *ctx ) )
{
if( global_data.rng_state != RNG_NOT_INITIALIZED )
return( PSA_ERROR_BAD_STATE );
global_data.entropy_init = entropy_init;
global_data.entropy_free = entropy_free;
return( PSA_SUCCESS );
}
void mbedtls_psa_crypto_free( void )
{
psa_wipe_all_key_slots( );
if( global_data.rng_state != RNG_NOT_INITIALIZED )
{
mbedtls_ctr_drbg_free( &global_data.ctr_drbg );
global_data.entropy_free( &global_data.entropy );
}
/* Wipe all remaining data, including configuration.
* In particular, this sets all state indicator to the value
* indicating "uninitialized". */
mbedtls_platform_zeroize( &global_data, sizeof( global_data ) );
}
psa_status_t psa_crypto_init( void )
{
psa_status_t status;
const unsigned char drbg_seed[] = "PSA";
/* Double initialization is explicitly allowed. */
if( global_data.initialized != 0 )
return( PSA_SUCCESS );
/* Set default configuration if
* mbedtls_psa_crypto_configure_entropy_sources() hasn't been called. */
if( global_data.entropy_init == NULL )
global_data.entropy_init = mbedtls_entropy_init;
if( global_data.entropy_free == NULL )
global_data.entropy_free = mbedtls_entropy_free;
/* Initialize the random generator. */
global_data.entropy_init( &global_data.entropy );
mbedtls_ctr_drbg_init( &global_data.ctr_drbg );
global_data.rng_state = RNG_INITIALIZED;
status = mbedtls_to_psa_error(
mbedtls_ctr_drbg_seed( &global_data.ctr_drbg,
mbedtls_entropy_func,
&global_data.entropy,
drbg_seed, sizeof( drbg_seed ) - 1 ) );
if( status != PSA_SUCCESS )
goto exit;
global_data.rng_state = RNG_SEEDED;
status = psa_initialize_key_slots( );
if( status != PSA_SUCCESS )
goto exit;
/* All done. */
global_data.initialized = 1;
exit:
if( status != PSA_SUCCESS )
mbedtls_psa_crypto_free( );
return( status );
}
#endif /* MBEDTLS_PSA_CRYPTO_C */
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