mbedtls/library/pk.c

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/*
* Public Key abstraction layer
*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
*
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* 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
*
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* http://www.apache.org/licenses/LICENSE-2.0
*
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* 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.
*
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* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PK_C)
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#include "mbedtls/pk.h"
#include "mbedtls/pk_internal.h"
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#include "mbedtls/platform_util.h"
#if defined(MBEDTLS_RSA_C)
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#include "mbedtls/rsa.h"
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#endif
#if defined(MBEDTLS_ECP_C)
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#include "mbedtls/ecp.h"
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#endif
#if defined(MBEDTLS_ECDSA_C)
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#include "mbedtls/ecdsa.h"
#endif
#include <limits.h>
#include <stdint.h>
/* Parameter validation macros based on platform_util.h */
#define PK_VALIDATE_RET( cond ) \
MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA )
#define PK_VALIDATE( cond ) \
MBEDTLS_INTERNAL_VALIDATE( cond )
/*
* Access to members of the pk_info structure. These are meant to be replaced
* by zero-runtime-cost accessors when a single PK type is hardcoded.
*
* For function members, don't make a getter, but a function that directly
* calls the method, so that we can entirely get rid of function pointers
* when hardcoding a single PK - some compilers optimize better that way.
*
* Not implemented for members that are only present in builds with
* MBEDTLS_ECP_RESTARTABLE for now, as the main target for hardcoded is builds
* with MBEDTLS_USE_TINYCRYPT, which don't have MBEDTLS_ECP_RESTARTABLE.
*/
MBEDTLS_ALWAYS_INLINE static inline mbedtls_pk_type_t pk_info_type(
const mbedtls_pk_info_t *info )
{
return( info->type );
}
MBEDTLS_ALWAYS_INLINE static inline const char * pk_info_name(
const mbedtls_pk_info_t *info )
{
return( info->name );
}
MBEDTLS_ALWAYS_INLINE static inline size_t pk_info_get_bitlen(
const mbedtls_pk_info_t *info, const void *ctx )
{
return( info->get_bitlen( ctx ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_can_do(
const mbedtls_pk_info_t *info, mbedtls_pk_type_t type )
{
return( info->can_do( type ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_verify_func(
const mbedtls_pk_info_t *info, void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
if( info->verify_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( info->verify_func( ctx, md_alg, hash, hash_len, sig, sig_len ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_sign_func(
const mbedtls_pk_info_t *info, void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
if( info->sign_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( info->sign_func( ctx, md_alg, hash, hash_len, sig, sig_len,
f_rng, p_rng ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_decrypt_func(
const mbedtls_pk_info_t *info, void *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
if( info->decrypt_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( info->decrypt_func( ctx, input, ilen, output, olen, osize,
f_rng, p_rng ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_encrypt_func(
const mbedtls_pk_info_t *info, void *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
if( info->encrypt_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( info->encrypt_func( ctx, input, ilen, output, olen, osize,
f_rng, p_rng ) );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_check_pair_func(
const mbedtls_pk_info_t *info, const void *pub, const void *prv )
{
if( info->check_pair_func == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
return( info->check_pair_func( pub, prv ) );
}
MBEDTLS_ALWAYS_INLINE static inline void *pk_info_ctx_alloc_func(
const mbedtls_pk_info_t *info )
{
return( info->ctx_alloc_func( ) );
}
MBEDTLS_ALWAYS_INLINE static inline void pk_info_ctx_free_func(
const mbedtls_pk_info_t *info, void *ctx )
{
info->ctx_free_func( ctx );
}
MBEDTLS_ALWAYS_INLINE static inline int pk_info_debug_func(
const mbedtls_pk_info_t *info,
const void *ctx, mbedtls_pk_debug_item *items )
{
if( info->debug_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
info->debug_func( ctx, items );
return( 0 );
}
/*
* Initialise a mbedtls_pk_context
*/
void mbedtls_pk_init( mbedtls_pk_context *ctx )
{
PK_VALIDATE( ctx != NULL );
ctx->pk_info = NULL;
ctx->pk_ctx = NULL;
}
/*
* Free (the components of) a mbedtls_pk_context
*/
void mbedtls_pk_free( mbedtls_pk_context *ctx )
{
if( ctx == NULL )
return;
if ( ctx->pk_info != NULL )
pk_info_ctx_free_func( ctx->pk_info, ctx->pk_ctx );
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_pk_context ) );
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/*
* Initialize a restart context
*/
void mbedtls_pk_restart_init( mbedtls_pk_restart_ctx *ctx )
{
PK_VALIDATE( ctx != NULL );
ctx->pk_info = NULL;
ctx->rs_ctx = NULL;
}
/*
* Free the components of a restart context
*/
void mbedtls_pk_restart_free( mbedtls_pk_restart_ctx *ctx )
{
if( ctx == NULL || ctx->pk_info == NULL ||
ctx->pk_info->rs_free_func == NULL )
{
return;
}
ctx->pk_info->rs_free_func( ctx->rs_ctx );
ctx->pk_info = NULL;
ctx->rs_ctx = NULL;
}
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
/*
* Get pk_info structure from type
*/
const mbedtls_pk_info_t * mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type )
{
switch( pk_type ) {
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_PK_RSA:
return( &mbedtls_rsa_info );
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#endif
#if defined(MBEDTLS_ECP_C)
case MBEDTLS_PK_ECKEY_DH:
return( &mbedtls_eckeydh_info );
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#endif
#if defined(MBEDTLS_ECDSA_C)
case MBEDTLS_PK_ECDSA:
return( &mbedtls_ecdsa_info );
#endif
#if defined(MBEDTLS_USE_TINYCRYPT)
case MBEDTLS_PK_ECKEY:
return( &mbedtls_uecc_eckey_info );
#else /* MBEDTLS_USE_TINYCRYPT */
#if defined(MBEDTLS_ECP_C)
case MBEDTLS_PK_ECKEY:
return( &mbedtls_eckey_info );
#endif
#endif /* MBEDTLS_USE_TINYCRYPT */
/* MBEDTLS_PK_RSA_ALT omitted on purpose */
default:
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return( NULL );
}
}
/*
* Initialise context
*/
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int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info )
{
PK_VALIDATE_RET( ctx != NULL );
if( info == NULL || ctx->pk_info != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ( ctx->pk_ctx = pk_info_ctx_alloc_func( info ) ) == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
ctx->pk_info = info;
return( 0 );
}
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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/*
* Initialize an RSA-alt context
*/
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int mbedtls_pk_setup_rsa_alt( mbedtls_pk_context *ctx, void * key,
mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
mbedtls_pk_rsa_alt_sign_func sign_func,
mbedtls_pk_rsa_alt_key_len_func key_len_func )
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{
mbedtls_rsa_alt_context *rsa_alt;
const mbedtls_pk_info_t *info = &mbedtls_rsa_alt_info;
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PK_VALIDATE_RET( ctx != NULL );
if( ctx->pk_info != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
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ctx->pk_info = info;
rsa_alt = (mbedtls_rsa_alt_context *) ctx->pk_ctx;
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rsa_alt->key = key;
rsa_alt->decrypt_func = decrypt_func;
rsa_alt->sign_func = sign_func;
rsa_alt->key_len_func = key_len_func;
return( 0 );
}
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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/*
* Tell if a PK can do the operations of the given type
*/
int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type )
{
/* A context with null pk_info is not set up yet and can't do anything.
* For backward compatibility, also accept NULL instead of a context
* pointer. */
if( ctx == NULL || ctx->pk_info == NULL )
return( 0 );
return( pk_info_can_do( ctx->pk_info, type ) );
}
/*
* Helper for mbedtls_pk_sign and mbedtls_pk_verify
*/
static inline int pk_hashlen_helper( mbedtls_md_type_t md_alg, size_t *hash_len )
{
mbedtls_md_handle_t md_info;
if( *hash_len != 0 )
return( 0 );
if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) ==
MBEDTLS_MD_INVALID_HANDLE )
{
return( -1 );
}
*hash_len = mbedtls_md_get_size( md_info );
return( 0 );
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/*
* Helper to set up a restart context if needed
*/
static int pk_restart_setup( mbedtls_pk_restart_ctx *ctx,
const mbedtls_pk_info_t *info )
{
/* Don't do anything if already set up or invalid */
if( ctx == NULL || ctx->pk_info != NULL )
return( 0 );
/* Should never happen when we're called */
if( info->rs_alloc_func == NULL || info->rs_free_func == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ( ctx->rs_ctx = info->rs_alloc_func() ) == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
ctx->pk_info = info;
return( 0 );
}
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
/*
* Verify a signature (restartable)
*/
int mbedtls_pk_verify_restartable( mbedtls_pk_context *ctx,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
mbedtls_pk_restart_ctx *rs_ctx )
{
PK_VALIDATE_RET( ctx != NULL );
PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
hash != NULL );
PK_VALIDATE_RET( sig != NULL );
if( ctx->pk_info == NULL ||
pk_hashlen_helper( md_alg, &hash_len ) != 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* optimization: use non-restartable version if restart disabled */
if( rs_ctx != NULL &&
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mbedtls_ecp_restart_is_enabled() &&
ctx->pk_info->verify_rs_func != NULL )
{
int ret;
if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
return( ret );
ret = ctx->pk_info->verify_rs_func( ctx->pk_ctx,
md_alg, hash, hash_len, sig, sig_len, rs_ctx->rs_ctx );
if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
mbedtls_pk_restart_free( rs_ctx );
return( ret );
}
#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
(void) rs_ctx;
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
return( pk_info_verify_func( ctx->pk_info, ctx->pk_ctx, md_alg, hash, hash_len,
sig, sig_len ) );
}
/*
* Verify a signature
*/
int mbedtls_pk_verify( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
return( mbedtls_pk_verify_restartable( ctx, md_alg, hash, hash_len,
sig, sig_len, NULL ) );
}
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/*
* Verify a signature with options
*/
int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
PK_VALIDATE_RET( ctx != NULL );
PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
hash != NULL );
PK_VALIDATE_RET( sig != NULL );
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( ! mbedtls_pk_can_do( ctx, type ) )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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if( type == MBEDTLS_PK_RSASSA_PSS )
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{
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
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int ret;
const mbedtls_pk_rsassa_pss_options *pss_opts;
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#if SIZE_MAX > UINT_MAX
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* SIZE_MAX > UINT_MAX */
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if( options == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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pss_opts = (const mbedtls_pk_rsassa_pss_options *) options;
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if( sig_len < mbedtls_pk_get_len( ctx ) )
return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
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ret = mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_pk_rsa( *ctx ),
NULL, NULL, MBEDTLS_RSA_PUBLIC,
md_alg, (unsigned int) hash_len, hash,
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pss_opts->mgf1_hash_id,
pss_opts->expected_salt_len,
sig );
if( ret != 0 )
return( ret );
if( sig_len > mbedtls_pk_get_len( ctx ) )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
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return( 0 );
#else
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
#endif /* MBEDTLS_RSA_C && MBEDTLS_PKCS1_V21 */
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}
/* General case: no options */
if( options != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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return( mbedtls_pk_verify( ctx, md_alg, hash, hash_len, sig, sig_len ) );
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}
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/*
* Make a signature (restartable)
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*/
int mbedtls_pk_sign_restartable( mbedtls_pk_context *ctx,
mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
mbedtls_pk_restart_ctx *rs_ctx )
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{
PK_VALIDATE_RET( ctx != NULL );
PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) ||
hash != NULL );
PK_VALIDATE_RET( sig != NULL );
if( ctx->pk_info == NULL ||
pk_hashlen_helper( md_alg, &hash_len ) != 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* optimization: use non-restartable version if restart disabled */
if( rs_ctx != NULL &&
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mbedtls_ecp_restart_is_enabled() &&
ctx->pk_info->sign_rs_func != NULL )
{
int ret;
if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
return( ret );
ret = ctx->pk_info->sign_rs_func( ctx->pk_ctx, md_alg,
hash, hash_len, sig, sig_len, f_rng, p_rng, rs_ctx->rs_ctx );
if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
mbedtls_pk_restart_free( rs_ctx );
return( ret );
}
#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
(void) rs_ctx;
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
return( pk_info_sign_func( ctx->pk_info, ctx->pk_ctx, md_alg, hash, hash_len,
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sig, sig_len, f_rng, p_rng ) );
}
/*
* Make a signature
*/
int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
return( mbedtls_pk_sign_restartable( ctx, md_alg, hash, hash_len,
sig, sig_len, f_rng, p_rng, NULL ) );
}
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/*
* Decrypt message
*/
int mbedtls_pk_decrypt( mbedtls_pk_context *ctx,
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const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
PK_VALIDATE_RET( ctx != NULL );
PK_VALIDATE_RET( input != NULL || ilen == 0 );
PK_VALIDATE_RET( output != NULL || osize == 0 );
PK_VALIDATE_RET( olen != NULL );
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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return( pk_info_decrypt_func( ctx->pk_info, ctx->pk_ctx, input, ilen,
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output, olen, osize, f_rng, p_rng ) );
}
/*
* Encrypt message
*/
int mbedtls_pk_encrypt( mbedtls_pk_context *ctx,
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const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
PK_VALIDATE_RET( ctx != NULL );
PK_VALIDATE_RET( input != NULL || ilen == 0 );
PK_VALIDATE_RET( output != NULL || osize == 0 );
PK_VALIDATE_RET( olen != NULL );
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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return( pk_info_encrypt_func( ctx->pk_info, ctx->pk_ctx, input, ilen,
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output, olen, osize, f_rng, p_rng ) );
}
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/*
* Check public-private key pair
*/
int mbedtls_pk_check_pair( const mbedtls_pk_context *pub, const mbedtls_pk_context *prv )
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{
PK_VALIDATE_RET( pub != NULL );
PK_VALIDATE_RET( prv != NULL );
if( pub->pk_info == NULL || prv->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
if( pk_info_type( prv->pk_info ) == MBEDTLS_PK_RSA_ALT )
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{
if( pk_info_type( pub->pk_info ) != MBEDTLS_PK_RSA )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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}
else
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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{
if( pub->pk_info != prv->pk_info )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
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}
return( pk_info_check_pair_func( prv->pk_info, pub->pk_ctx, prv->pk_ctx ) );
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}
/*
* Get key size in bits
*/
size_t mbedtls_pk_get_bitlen( const mbedtls_pk_context *ctx )
{
/* For backward compatibility, accept NULL or a context that
* isn't set up yet, and return a fake value that should be safe. */
if( ctx == NULL || ctx->pk_info == NULL )
return( 0 );
return( pk_info_get_bitlen( ctx->pk_info, ctx->pk_ctx ) );
}
/*
* Export debug information
*/
int mbedtls_pk_debug( const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items )
{
PK_VALIDATE_RET( ctx != NULL );
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
return( pk_info_debug_func( ctx->pk_info, ctx->pk_ctx, items ) );
}
/*
* Access the PK type name
*/
const char *mbedtls_pk_get_name( const mbedtls_pk_context *ctx )
{
if( ctx == NULL || ctx->pk_info == NULL )
return( "invalid PK" );
return( pk_info_name( ctx->pk_info ) );
}
/*
* Access the PK type
*/
mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx )
{
if( ctx == NULL || ctx->pk_info == NULL )
return( MBEDTLS_PK_NONE );
return( pk_info_type( ctx->pk_info ) );
}
#endif /* MBEDTLS_PK_C */