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3f864c2457
mbedtls/library/pk_wrap.c
Andrzej Kurek 3f864c2457 pk_wrap: add a check for equal signature parts
2018-11-22 11:17:37 -05:00

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/*
* Public Key abstraction layer: wrapper functions
*
* Copyright (C) 2006-2015, 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_PK_C)
#include "mbedtls/pk_internal.h"
/* Even if RSA not activated, for the sake of RSA-alt */
#include "mbedtls/rsa.h"
#include <string.h>
#if defined(MBEDTLS_ECP_C)
#include "mbedtls/ecp.h"
#endif
#if defined(MBEDTLS_ECDSA_C)
#include "mbedtls/ecdsa.h"
#endif
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
#include "mbedtls/platform_util.h"
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#include "mbedtls/x509.h"
#include "mbedtls/asn1.h"
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
#include <limits.h>
#include <stdint.h>
#if defined(MBEDTLS_RSA_C)
static int rsa_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_RSA ||
type == MBEDTLS_PK_RSASSA_PSS );
}
static size_t rsa_get_bitlen( const void *ctx )
{
const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx;
return( 8 * mbedtls_rsa_get_len( rsa ) );
}
static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
int ret;
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
size_t rsa_len = mbedtls_rsa_get_len( rsa );
#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 */
if( sig_len < rsa_len )
return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
if( ( ret = mbedtls_rsa_pkcs1_verify( rsa, NULL, NULL,
MBEDTLS_RSA_PUBLIC, md_alg,
(unsigned int) hash_len, hash, sig ) ) != 0 )
return( ret );
/* The buffer contains a valid signature followed by extra data.
* We have a special error code for that so that so that callers can
* use mbedtls_pk_verify() to check "Does the buffer start with a
* valid signature?" and not just "Does the buffer contain a valid
* signature?". */
if( sig_len > rsa_len )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
return( 0 );
}
static int rsa_sign_wrap( 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 )
{
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
#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 */
*sig_len = mbedtls_rsa_get_len( rsa );
return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
md_alg, (unsigned int) hash_len, hash, sig ) );
}
static int rsa_decrypt_wrap( 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 )
{
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
if( ilen != mbedtls_rsa_get_len( rsa ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
return( mbedtls_rsa_pkcs1_decrypt( rsa, f_rng, p_rng,
MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
}
static int rsa_encrypt_wrap( 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 )
{
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
*olen = mbedtls_rsa_get_len( rsa );
if( *olen > osize )
return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
return( mbedtls_rsa_pkcs1_encrypt( rsa, f_rng, p_rng, MBEDTLS_RSA_PUBLIC,
ilen, input, output ) );
}
static int rsa_check_pair_wrap( const void *pub, const void *prv )
{
return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
(const mbedtls_rsa_context *) prv ) );
}
static void *rsa_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );
if( ctx != NULL )
mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );
return( ctx );
}
static void rsa_free_wrap( void *ctx )
{
mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
mbedtls_free( ctx );
}
static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )
{
items->type = MBEDTLS_PK_DEBUG_MPI;
items->name = "rsa.N";
items->value = &( ((mbedtls_rsa_context *) ctx)->N );
items++;
items->type = MBEDTLS_PK_DEBUG_MPI;
items->name = "rsa.E";
items->value = &( ((mbedtls_rsa_context *) ctx)->E );
}
const mbedtls_pk_info_t mbedtls_rsa_info = {
MBEDTLS_PK_RSA,
"RSA",
rsa_get_bitlen,
rsa_can_do,
rsa_verify_wrap,
rsa_sign_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
rsa_decrypt_wrap,
rsa_encrypt_wrap,
rsa_check_pair_wrap,
rsa_alloc_wrap,
rsa_free_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
rsa_debug,
};
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_C)
/*
* Generic EC key
*/
static int eckey_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_ECKEY ||
type == MBEDTLS_PK_ECKEY_DH ||
type == MBEDTLS_PK_ECDSA );
}
static size_t eckey_get_bitlen( const void *ctx )
{
return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
}
#if defined(MBEDTLS_ECDSA_C)
/* Forward declarations */
static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len );
static int ecdsa_sign_wrap( 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 );
static int eckey_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
int ret;
mbedtls_ecdsa_context ecdsa;
mbedtls_ecdsa_init( &ecdsa );
if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
mbedtls_ecdsa_free( &ecdsa );
return( ret );
}
static int eckey_sign_wrap( 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 )
{
int ret;
mbedtls_ecdsa_context ecdsa;
mbedtls_ecdsa_init( &ecdsa );
if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
f_rng, p_rng );
mbedtls_ecdsa_free( &ecdsa );
return( ret );
}
#if defined(MBEDTLS_ECP_RESTARTABLE)
/* Forward declarations */
static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx );
static int ecdsa_sign_rs_wrap( 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,
void *rs_ctx );
/*
* Restart context for ECDSA operations with ECKEY context
*
* We need to store an actual ECDSA context, as we need to pass the same to
* the underlying ecdsa function, so we can't create it on the fly every time.
*/
typedef struct
{
mbedtls_ecdsa_restart_ctx ecdsa_rs;
mbedtls_ecdsa_context ecdsa_ctx;
} eckey_restart_ctx;
static void *eckey_rs_alloc( void )
{
eckey_restart_ctx *rs_ctx;
void *ctx = mbedtls_calloc( 1, sizeof( eckey_restart_ctx ) );
if( ctx != NULL )
{
rs_ctx = ctx;
mbedtls_ecdsa_restart_init( &rs_ctx->ecdsa_rs );
mbedtls_ecdsa_init( &rs_ctx->ecdsa_ctx );
}
return( ctx );
}
static void eckey_rs_free( void *ctx )
{
eckey_restart_ctx *rs_ctx;
if( ctx == NULL)
return;
rs_ctx = ctx;
mbedtls_ecdsa_restart_free( &rs_ctx->ecdsa_rs );
mbedtls_ecdsa_free( &rs_ctx->ecdsa_ctx );
mbedtls_free( ctx );
}
static int eckey_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx )
{
int ret;
eckey_restart_ctx *rs = rs_ctx;
/* Should never happen */
if( rs == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
/* set up our own sub-context if needed (that is, on first run) */
if( rs->ecdsa_ctx.grp.pbits == 0 )
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );
MBEDTLS_MPI_CHK( ecdsa_verify_rs_wrap( &rs->ecdsa_ctx,
md_alg, hash, hash_len,
sig, sig_len, &rs->ecdsa_rs ) );
cleanup:
return( ret );
}
static int eckey_sign_rs_wrap( 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,
void *rs_ctx )
{
int ret;
eckey_restart_ctx *rs = rs_ctx;
/* Should never happen */
if( rs == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
/* set up our own sub-context if needed (that is, on first run) */
if( rs->ecdsa_ctx.grp.pbits == 0 )
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );
MBEDTLS_MPI_CHK( ecdsa_sign_rs_wrap( &rs->ecdsa_ctx, md_alg,
hash, hash_len, sig, sig_len,
f_rng, p_rng, &rs->ecdsa_rs ) );
cleanup:
return( ret );
}
#endif /* MBEDTLS_ECP_RESTARTABLE */
#endif /* MBEDTLS_ECDSA_C */
static int eckey_check_pair( const void *pub, const void *prv )
{
return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
(const mbedtls_ecp_keypair *) prv ) );
}
static void *eckey_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
if( ctx != NULL )
mbedtls_ecp_keypair_init( ctx );
return( ctx );
}
static void eckey_free_wrap( void *ctx )
{
mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
mbedtls_free( ctx );
}
static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )
{
items->type = MBEDTLS_PK_DEBUG_ECP;
items->name = "eckey.Q";
items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
}
const mbedtls_pk_info_t mbedtls_eckey_info = {
MBEDTLS_PK_ECKEY,
"EC",
eckey_get_bitlen,
eckey_can_do,
#if defined(MBEDTLS_ECDSA_C)
eckey_verify_wrap,
eckey_sign_wrap,
#if defined(MBEDTLS_ECP_RESTARTABLE)
eckey_verify_rs_wrap,
eckey_sign_rs_wrap,
#endif
#else /* MBEDTLS_ECDSA_C */
NULL,
NULL,
#endif /* MBEDTLS_ECDSA_C */
NULL,
NULL,
eckey_check_pair,
eckey_alloc_wrap,
eckey_free_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
eckey_rs_alloc,
eckey_rs_free,
#endif
eckey_debug,
};
/*
* EC key restricted to ECDH
*/
static int eckeydh_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_ECKEY ||
type == MBEDTLS_PK_ECKEY_DH );
}
const mbedtls_pk_info_t mbedtls_eckeydh_info = {
MBEDTLS_PK_ECKEY_DH,
"EC_DH",
eckey_get_bitlen, /* Same underlying key structure */
eckeydh_can_do,
NULL,
NULL,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
NULL,
NULL,
eckey_check_pair,
eckey_alloc_wrap, /* Same underlying key structure */
eckey_free_wrap, /* Same underlying key structure */
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
eckey_debug, /* Same underlying key structure */
};
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_ECDSA_C)
static int ecdsa_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_ECDSA );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static psa_status_t mbedtls_psa_get_free_key_slot( psa_key_slot_t *key )
{
for( psa_key_slot_t slot = 1; slot <= 32; slot++ )
{
if( psa_get_key_information( slot, NULL, NULL ) == PSA_ERROR_EMPTY_SLOT )
{
*key = slot;
return( PSA_SUCCESS );
}
}
return( PSA_ERROR_INSUFFICIENT_MEMORY );
}
static psa_algorithm_t translate_md_to_psa( mbedtls_md_type_t md_alg )
{
switch( md_alg )
{
#if defined(MBEDTLS_MD2_C)
case MBEDTLS_MD_MD2:
return( PSA_ALG_MD2 );
#endif
#if defined(MBEDTLS_MD4_C)
case MBEDTLS_MD_MD4:
return( PSA_ALG_MD4 );
#endif
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_MD_MD5:
return( PSA_ALG_MD5 );
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_MD_SHA1:
return( PSA_ALG_SHA_1 );
#endif
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_MD_SHA224:
return( PSA_ALG_SHA_224 );
case MBEDTLS_MD_SHA256:
return( PSA_ALG_SHA_256 );
#endif
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_MD_SHA384:
return( PSA_ALG_SHA_384 );
case MBEDTLS_MD_SHA512:
return( PSA_ALG_SHA_512 );
#endif
#if defined(MBEDTLS_RIPEMD160_C)
case MBEDTLS_MD_RIPEMD160:
return( PSA_ALG_RIPEMD160 );
#endif
case MBEDTLS_MD_NONE: // Intentional fallthrough
default:
return( 0 );
}
}
/*
* Convert a signature from an ASN.1 sequence of two integers
* to a raw {r,s} buffer. Note: upon a successful call, the caller
* takes ownership of the sig->p buffer.
*/
static int extract_ecdsa_sig( unsigned char **p, const unsigned char *end,
mbedtls_asn1_buf *sig )
{
int ret, tag_type;
size_t len_signature, len_partial;
if( ( end - *p ) < 1 )
{
return( MBEDTLS_ERR_X509_INVALID_SIGNATURE +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
}
tag_type = **p;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len_partial,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
return( MBEDTLS_ERR_X509_INVALID_SIGNATURE + ret );
}
if( ( ret = mbedtls_asn1_get_tag( p, end, &len_partial, MBEDTLS_ASN1_INTEGER ) )
!= 0 )
return( ret );
if( **p == '\0' )
{
( *p )++;
len_partial--;
}
sig->p = mbedtls_calloc( 2, len_partial );
if( sig->p == NULL )
return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
memcpy( sig->p, *p, len_partial );
len_signature = len_partial;
( *p ) += len_partial;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len_partial,
MBEDTLS_ASN1_INTEGER ) ) != 0 )
{
mbedtls_free( sig->p );
sig->p = NULL;
return( ret );
}
if( **p == '\0' )
{
( *p )++;
len_partial--;
}
// Check if both parts are of the same size
if( len_partial != len_signature )
return( MBEDTLS_ERR_X509_INVALID_SIGNATURE );
memcpy( sig->p + len_partial, *p, len_partial );
len_signature += len_partial;
sig->tag = tag_type;
sig->len = len_signature;
( *p ) += len_partial;
return( 0 );
}
static psa_ecc_curve_t mbedtls_ecc_group_to_psa( mbedtls_ecp_group_id grpid )
{
switch( grpid )
{
#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
case MBEDTLS_ECP_DP_SECP192R1:
return( PSA_ECC_CURVE_SECP192R1 );
#endif
#if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
case MBEDTLS_ECP_DP_SECP224R1:
return( PSA_ECC_CURVE_SECP224R1 );
#endif
#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
case MBEDTLS_ECP_DP_SECP256R1:
return( PSA_ECC_CURVE_SECP256R1 );
#endif
#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
case MBEDTLS_ECP_DP_SECP384R1:
return( PSA_ECC_CURVE_SECP384R1 );
#endif
#if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
case MBEDTLS_ECP_DP_SECP521R1:
return( PSA_ECC_CURVE_SECP521R1 );
#endif
#if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED)
case MBEDTLS_ECP_DP_BP256R1:
return( PSA_ECC_CURVE_BRAINPOOL_P256R1 );
#endif
#if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED)
case MBEDTLS_ECP_DP_BP384R1:
return( PSA_ECC_CURVE_BRAINPOOL_P384R1 );
#endif
#if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)
case MBEDTLS_ECP_DP_BP512R1:
return( PSA_ECC_CURVE_BRAINPOOL_P512R1 );
#endif
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
case MBEDTLS_ECP_DP_CURVE25519:
return( PSA_ECC_CURVE_CURVE25519 );
#endif
#if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
case MBEDTLS_ECP_DP_SECP192K1:
return( PSA_ECC_CURVE_SECP192K1 );
#endif
#if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
case MBEDTLS_ECP_DP_SECP224K1:
return( PSA_ECC_CURVE_SECP224K1 );
#endif
#if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
case MBEDTLS_ECP_DP_SECP256K1:
return( PSA_ECC_CURVE_SECP256K1 );
#endif
#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
case MBEDTLS_ECP_DP_CURVE448:
return( PSA_ECC_CURVE_CURVE448 );
#endif
default:
return( 0 );
}
}
static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
int ret;
psa_key_slot_t key_slot;
psa_key_policy_t policy;
psa_key_type_t psa_type;
mbedtls_pk_context key;
mbedtls_asn1_buf signature;
int key_len;
const int buf_len = 30 + 2 * MBEDTLS_ECP_MAX_BYTES; // Equivalent of ECP_PUB_DER_MAX_BYTES
unsigned char buf[buf_len];
unsigned char *p = (unsigned char*) sig;
mbedtls_pk_info_t pk_info = mbedtls_eckey_info;
psa_algorithm_t psa_sig_md = PSA_ALG_ECDSA( translate_md_to_psa( md_alg ) );
psa_ecc_curve_t curve = mbedtls_ecc_group_to_psa ( ( (mbedtls_ecdsa_context *) ctx )->grp.id );
if( curve == 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
memset( &signature, 0, sizeof( mbedtls_asn1_buf ) );
key.pk_info = &pk_info;
key.pk_ctx = ctx;
psa_crypto_init();
psa_type = PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve );
if( extract_ecdsa_sig( &p, p + sig_len, &signature ) != 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
key_len = mbedtls_pk_write_pubkey_der( &key, buf, buf_len );
if( key_len <= 0 )
{
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
goto cleanup;
}
if( mbedtls_psa_get_free_key_slot( &key_slot ) != PSA_SUCCESS )
{
ret = MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
goto cleanup;
}
psa_key_policy_init( &policy );
psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, psa_sig_md );
if( psa_set_key_policy( key_slot, &policy ) != PSA_SUCCESS )
{
ret = MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
goto cleanup;
}
if( psa_import_key( key_slot, psa_type, buf+buf_len-key_len, key_len )
!= PSA_SUCCESS )
{
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
goto cleanup;
}
if( psa_asymmetric_verify( key_slot, psa_sig_md,
hash, hash_len,
signature.p, signature.len )
!= PSA_SUCCESS )
{
psa_destroy_key( key_slot );
ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
goto cleanup;
}
ret = 0;
psa_destroy_key( key_slot );
cleanup:
mbedtls_free( signature.p );
return( ret );
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
int ret;
((void) md_alg);
ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
hash, hash_len, sig, sig_len );
if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
return( ret );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
static int ecdsa_sign_wrap( 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 )
{
return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,
md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );
}
#if defined(MBEDTLS_ECP_RESTARTABLE)
static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx )
{
int ret;
((void) md_alg);
ret = mbedtls_ecdsa_read_signature_restartable(
(mbedtls_ecdsa_context *) ctx,
hash, hash_len, sig, sig_len,
(mbedtls_ecdsa_restart_ctx *) rs_ctx );
if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
return( ret );
}
static int ecdsa_sign_rs_wrap( 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,
void *rs_ctx )
{
return( mbedtls_ecdsa_write_signature_restartable(
(mbedtls_ecdsa_context *) ctx,
md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng,
(mbedtls_ecdsa_restart_ctx *) rs_ctx ) );
}
#endif /* MBEDTLS_ECP_RESTARTABLE */
static void *ecdsa_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );
if( ctx != NULL )
mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );
return( ctx );
}
static void ecdsa_free_wrap( void *ctx )
{
mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );
mbedtls_free( ctx );
}
#if defined(MBEDTLS_ECP_RESTARTABLE)
static void *ecdsa_rs_alloc( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_restart_ctx ) );
if( ctx != NULL )
mbedtls_ecdsa_restart_init( ctx );
return( ctx );
}
static void ecdsa_rs_free( void *ctx )
{
mbedtls_ecdsa_restart_free( ctx );
mbedtls_free( ctx );
}
#endif /* MBEDTLS_ECP_RESTARTABLE */
const mbedtls_pk_info_t mbedtls_ecdsa_info = {
MBEDTLS_PK_ECDSA,
"ECDSA",
eckey_get_bitlen, /* Compatible key structures */
ecdsa_can_do,
ecdsa_verify_wrap,
ecdsa_sign_wrap,
#if defined(MBEDTLS_ECP_RESTARTABLE)
ecdsa_verify_rs_wrap,
ecdsa_sign_rs_wrap,
#endif
NULL,
NULL,
eckey_check_pair, /* Compatible key structures */
ecdsa_alloc_wrap,
ecdsa_free_wrap,
#if defined(MBEDTLS_ECP_RESTARTABLE)
ecdsa_rs_alloc,
ecdsa_rs_free,
#endif
eckey_debug, /* Compatible key structures */
};
#endif /* MBEDTLS_ECDSA_C */
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/*
* Support for alternative RSA-private implementations
*/
static int rsa_alt_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_RSA );
}
static size_t rsa_alt_get_bitlen( const void *ctx )
{
const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx;
return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
}
static int rsa_alt_sign_wrap( 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 )
{
mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
#if SIZE_MAX > UINT_MAX
if( UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* SIZE_MAX > UINT_MAX */
*sig_len = rsa_alt->key_len_func( rsa_alt->key );
return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
md_alg, (unsigned int) hash_len, hash, sig ) );
}
static int rsa_alt_decrypt_wrap( 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 )
{
mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
((void) f_rng);
((void) p_rng);
if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
return( rsa_alt->decrypt_func( rsa_alt->key,
MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
}
#if defined(MBEDTLS_RSA_C)
static int rsa_alt_check_pair( const void *pub, const void *prv )
{
unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
unsigned char hash[32];
size_t sig_len = 0;
int ret;
if( rsa_alt_get_bitlen( prv ) != rsa_get_bitlen( pub ) )
return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
memset( hash, 0x2a, sizeof( hash ) );
if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,
hash, sizeof( hash ),
sig, &sig_len, NULL, NULL ) ) != 0 )
{
return( ret );
}
if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,
hash, sizeof( hash ), sig, sig_len ) != 0 )
{
return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
}
return( 0 );
}
#endif /* MBEDTLS_RSA_C */
static void *rsa_alt_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );
if( ctx != NULL )
memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );
return( ctx );
}
static void rsa_alt_free_wrap( void *ctx )
{
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );
mbedtls_free( ctx );
}
const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
MBEDTLS_PK_RSA_ALT,
"RSA-alt",
rsa_alt_get_bitlen,
rsa_alt_can_do,
NULL,
rsa_alt_sign_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
rsa_alt_decrypt_wrap,
NULL,
#if defined(MBEDTLS_RSA_C)
rsa_alt_check_pair,
#else
NULL,
#endif
rsa_alt_alloc_wrap,
rsa_alt_free_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
NULL,
};
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
#endif /* MBEDTLS_PK_C */
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