mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-12-26 12:15:44 +00:00
386 lines
14 KiB
C
386 lines
14 KiB
C
/*
|
|
* PSA AEAD entry points
|
|
*/
|
|
/*
|
|
* Copyright The Mbed TLS Contributors
|
|
* 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.
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_C)
|
|
|
|
#include "psa_crypto_aead.h"
|
|
#include "psa_crypto_core.h"
|
|
|
|
#include "mbedtls/ccm.h"
|
|
#include "mbedtls/chachapoly.h"
|
|
#include "mbedtls/cipher.h"
|
|
#include "mbedtls/gcm.h"
|
|
|
|
typedef struct
|
|
{
|
|
union
|
|
{
|
|
unsigned dummy; /* Make the union non-empty even with no supported algorithms. */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
|
|
mbedtls_ccm_context ccm;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
mbedtls_gcm_context gcm;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
mbedtls_chachapoly_context chachapoly;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
} ctx;
|
|
psa_algorithm_t core_alg;
|
|
uint8_t tag_length;
|
|
} aead_operation_t;
|
|
|
|
#define AEAD_OPERATION_INIT {{0}, 0, 0}
|
|
|
|
static void psa_aead_abort_internal( aead_operation_t *operation )
|
|
{
|
|
switch( operation->core_alg )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
|
|
case PSA_ALG_CCM:
|
|
mbedtls_ccm_free( &operation->ctx.ccm );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
case PSA_ALG_GCM:
|
|
mbedtls_gcm_free( &operation->ctx.gcm );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
case PSA_ALG_CHACHA20_POLY1305:
|
|
mbedtls_chachapoly_free( &operation->ctx.chachapoly );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
}
|
|
}
|
|
|
|
static psa_status_t psa_aead_setup(
|
|
aead_operation_t *operation,
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer,
|
|
psa_algorithm_t alg )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
size_t key_bits;
|
|
const mbedtls_cipher_info_t *cipher_info;
|
|
mbedtls_cipher_id_t cipher_id;
|
|
size_t full_tag_length = 0;
|
|
|
|
key_bits = attributes->core.bits;
|
|
|
|
cipher_info = mbedtls_cipher_info_from_psa( alg,
|
|
attributes->core.type, key_bits,
|
|
&cipher_id );
|
|
if( cipher_info == NULL )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
switch( PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg, 0 ) )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
|
|
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 0 ):
|
|
operation->core_alg = PSA_ALG_CCM;
|
|
full_tag_length = 16;
|
|
/* CCM allows the following tag lengths: 4, 6, 8, 10, 12, 14, 16.
|
|
* The call to mbedtls_ccm_encrypt_and_tag or
|
|
* mbedtls_ccm_auth_decrypt will validate the tag length. */
|
|
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.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,
|
|
key_buffer, (unsigned int) key_bits ) );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ):
|
|
operation->core_alg = PSA_ALG_GCM;
|
|
full_tag_length = 16;
|
|
/* GCM allows the following tag lengths: 4, 8, 12, 13, 14, 15, 16.
|
|
* The call to mbedtls_gcm_crypt_and_tag or
|
|
* mbedtls_gcm_auth_decrypt will validate the tag length. */
|
|
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.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,
|
|
key_buffer, (unsigned int) key_bits ) );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CHACHA20_POLY1305, 0 ):
|
|
operation->core_alg = PSA_ALG_CHACHA20_POLY1305;
|
|
full_tag_length = 16;
|
|
/* We only support the default tag length. */
|
|
if( alg != PSA_ALG_CHACHA20_POLY1305 )
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
|
|
mbedtls_chachapoly_init( &operation->ctx.chachapoly );
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_setkey( &operation->ctx.chachapoly,
|
|
key_buffer ) );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
|
|
default:
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( PSA_AEAD_TAG_LENGTH( attributes->core.type,
|
|
key_bits, alg )
|
|
> full_tag_length )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
|
|
operation->tag_length = PSA_AEAD_TAG_LENGTH( attributes->core.type,
|
|
key_bits,
|
|
alg );
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
psa_status_t mbedtls_psa_aead_encrypt(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
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 = PSA_ERROR_CORRUPTION_DETECTED;
|
|
aead_operation_t operation = AEAD_OPERATION_INIT;
|
|
uint8_t *tag;
|
|
(void) key_buffer_size;
|
|
|
|
status = psa_aead_setup( &operation, attributes, key_buffer, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
/* 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_PSA_BUILTIN_ALG_CCM)
|
|
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_PSA_BUILTIN_ALG_CCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
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_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
|
|
{
|
|
if( nonce_length != 12 )
|
|
{
|
|
if( nonce_length == 8 )
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
else
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation.tag_length != 16 )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_encrypt_and_tag( &operation.ctx.chachapoly,
|
|
plaintext_length,
|
|
nonce,
|
|
additional_data,
|
|
additional_data_length,
|
|
plaintext,
|
|
ciphertext,
|
|
tag ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
{
|
|
(void) tag;
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( status == PSA_SUCCESS )
|
|
*ciphertext_length = plaintext_length + operation.tag_length;
|
|
|
|
exit:
|
|
psa_aead_abort_internal( &operation );
|
|
|
|
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 mbedtls_psa_aead_decrypt(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
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 = PSA_ERROR_CORRUPTION_DETECTED;
|
|
aead_operation_t operation = AEAD_OPERATION_INIT;
|
|
const uint8_t *tag = NULL;
|
|
(void) key_buffer_size;
|
|
|
|
status = psa_aead_setup( &operation, attributes, key_buffer, alg );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = psa_aead_unpadded_locate_tag( operation.tag_length,
|
|
ciphertext, ciphertext_length,
|
|
plaintext_size, &tag );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
|
|
if( operation.core_alg == PSA_ALG_CCM )
|
|
{
|
|
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_PSA_BUILTIN_ALG_CCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
if( operation.core_alg == PSA_ALG_GCM )
|
|
{
|
|
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_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
|
|
{
|
|
if( nonce_length != 12 )
|
|
{
|
|
if( nonce_length == 8 )
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
else
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
|
goto exit;
|
|
}
|
|
|
|
if( operation.tag_length != 16 )
|
|
{
|
|
status = PSA_ERROR_NOT_SUPPORTED;
|
|
goto exit;
|
|
}
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_auth_decrypt( &operation.ctx.chachapoly,
|
|
ciphertext_length - operation.tag_length,
|
|
nonce,
|
|
additional_data,
|
|
additional_data_length,
|
|
tag,
|
|
ciphertext,
|
|
plaintext ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
{
|
|
return( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( status == PSA_SUCCESS )
|
|
*plaintext_length = ciphertext_length - operation.tag_length;
|
|
|
|
exit:
|
|
psa_aead_abort_internal( &operation );
|
|
|
|
if( status == PSA_SUCCESS )
|
|
*plaintext_length = ciphertext_length - operation.tag_length;
|
|
return( status );
|
|
}
|
|
|
|
#endif /* MBEDTLS_PSA_CRYPTO_C */
|
|
|