/* | |
* 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_USE_PSA_CRYPTO) | |
#include "mbedtls/asn1write.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/psa_util.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) | |
/* | |
* An ASN.1 encoded signature is a sequence of two ASN.1 integers. Parse one of | |
* those integers and convert it to the fixed-length encoding expected by PSA. | |
*/ | |
static int extract_ecdsa_sig_int( unsigned char **from, const unsigned char *end, | |
unsigned char *to, size_t to_len ) | |
{ | |
int ret; | |
size_t unpadded_len, padding_len; | |
if( ( ret = mbedtls_asn1_get_tag( from, end, &unpadded_len, | |
MBEDTLS_ASN1_INTEGER ) ) != 0 ) | |
{ | |
return( ret ); | |
} | |
while( unpadded_len > 0 && **from == 0x00 ) | |
{ | |
( *from )++; | |
unpadded_len--; | |
} | |
if( unpadded_len > to_len || unpadded_len == 0 ) | |
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); | |
padding_len = to_len - unpadded_len; | |
memset( to, 0x00, padding_len ); | |
memcpy( to + padding_len, *from, unpadded_len ); | |
( *from ) += unpadded_len; | |
return( 0 ); | |
} | |
/* | |
* Convert a signature from an ASN.1 sequence of two integers | |
* to a raw {r,s} buffer. Note: the provided sig buffer must be at least | |
* twice as big as int_size. | |
*/ | |
static int extract_ecdsa_sig( unsigned char **p, const unsigned char *end, | |
unsigned char *sig, size_t int_size ) | |
{ | |
int ret; | |
size_t tmp_size; | |
if( ( ret = mbedtls_asn1_get_tag( p, end, &tmp_size, | |
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) | |
return( ret ); | |
/* Extract r */ | |
if( ( ret = extract_ecdsa_sig_int( p, end, sig, int_size ) ) != 0 ) | |
return( ret ); | |
/* Extract s */ | |
if( ( ret = extract_ecdsa_sig_int( p, end, sig + int_size, int_size ) ) != 0 ) | |
return( ret ); | |
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_handle_t key_slot; | |
psa_key_policy_t policy; | |
psa_key_type_t psa_type; | |
mbedtls_pk_context key; | |
int key_len; | |
/* see ECP_PUB_DER_MAX_BYTES in pkwrite.c */ | |
unsigned char buf[30 + 2 * MBEDTLS_ECP_MAX_BYTES]; | |
unsigned char *p; | |
mbedtls_pk_info_t pk_info = mbedtls_eckey_info; | |
psa_algorithm_t psa_sig_md, psa_md; | |
psa_ecc_curve_t curve = mbedtls_psa_translate_ecc_group( | |
( (mbedtls_ecdsa_context *) ctx )->grp.id ); | |
const size_t signature_part_size = ( ( (mbedtls_ecdsa_context *) ctx )->grp.nbits + 7 ) / 8; | |
if( curve == 0 ) | |
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); | |
/* mbedtls_pk_write_pubkey() expects a full PK context; | |
* re-construct one to make it happy */ | |
key.pk_info = &pk_info; | |
key.pk_ctx = ctx; | |
p = buf + sizeof( buf ); | |
key_len = mbedtls_pk_write_pubkey( &p, buf, &key ); | |
if( key_len <= 0 ) | |
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); | |
psa_md = mbedtls_psa_translate_md( md_alg ); | |
if( psa_md == 0 ) | |
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); | |
psa_sig_md = PSA_ALG_ECDSA( psa_md ); | |
psa_type = PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve ); | |
if( ( ret = psa_allocate_key( &key_slot ) ) != PSA_SUCCESS ) | |
return( mbedtls_psa_err_translate_pk( ret ) ); | |
policy = psa_key_policy_init(); | |
psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, psa_sig_md ); | |
if( ( ret = psa_set_key_policy( key_slot, &policy ) ) != PSA_SUCCESS ) | |
{ | |
ret = mbedtls_psa_err_translate_pk( ret ); | |
goto cleanup; | |
} | |
if( psa_import_key( key_slot, psa_type, buf + sizeof( buf ) - key_len, key_len ) | |
!= PSA_SUCCESS ) | |
{ | |
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA; | |
goto cleanup; | |
} | |
/* We don't need the exported key anymore and can | |
* reuse its buffer for signature extraction. */ | |
if( 2 * signature_part_size > sizeof( buf ) ) | |
{ | |
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA; | |
goto cleanup; | |
} | |
p = (unsigned char*) sig; | |
if( ( ret = extract_ecdsa_sig( &p, sig + sig_len, buf, | |
signature_part_size ) ) != 0 ) | |
{ | |
goto cleanup; | |
} | |
if( psa_asymmetric_verify( key_slot, psa_sig_md, | |
hash, hash_len, | |
buf, 2 * signature_part_size ) | |
!= PSA_SUCCESS ) | |
{ | |
ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; | |
goto cleanup; | |
} | |
if( p != sig + sig_len ) | |
{ | |
ret = MBEDTLS_ERR_PK_SIG_LEN_MISMATCH; | |
goto cleanup; | |
} | |
ret = 0; | |
cleanup: | |
psa_destroy_key( key_slot ); | |
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 */ | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
static void *pk_opaque_alloc_wrap( void ) | |
{ | |
void *ctx = mbedtls_calloc( 1, sizeof( psa_key_handle_t ) ); | |
/* no _init() function to call, an calloc() already zeroized */ | |
return( ctx ); | |
} | |
static void pk_opaque_free_wrap( void *ctx ) | |
{ | |
mbedtls_platform_zeroize( ctx, sizeof( psa_key_handle_t ) ); | |
mbedtls_free( ctx ); | |
} | |
static size_t pk_opaque_get_bitlen( const void *ctx ) | |
{ | |
const psa_key_handle_t *key = (const psa_key_handle_t *) ctx; | |
size_t bits; | |
if( PSA_SUCCESS != psa_get_key_information( *key, NULL, &bits ) ) | |
return( 0 ); | |
return( bits ); | |
} | |
static int pk_opaque_can_do( mbedtls_pk_type_t type ) | |
{ | |
/* For now opaque PSA keys can only wrap ECC keypairs, | |
* as checked by setup_psa(). | |
* Also, ECKEY_DH does not really make sense with the current API. */ | |
return( type == MBEDTLS_PK_ECKEY || | |
type == MBEDTLS_PK_ECDSA ); | |
} | |
/* | |
* Simultaneously convert and move raw MPI from the beginning of a buffer | |
* to an ASN.1 MPI at the end of the buffer. | |
* See also mbedtls_asn1_write_mpi(). | |
* | |
* p: pointer to the end of the output buffer | |
* start: start of the output buffer, and also of the mpi to write at the end | |
* n_len: length of the mpi to read from start | |
*/ | |
static int asn1_write_mpibuf( unsigned char **p, unsigned char *start, | |
size_t n_len ) | |
{ | |
int ret; | |
size_t len = 0; | |
if( (size_t)( *p - start ) < n_len ) | |
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); | |
len = n_len; | |
*p -= len; | |
memmove( *p, start, len ); | |
/* ASN.1 DER encoding requires minimal length, so skip leading 0s. | |
* Neither r nor s should be 0, but as a failsafe measure, still detect | |
* that rather than overflowing the buffer in case of a PSA error. */ | |
while( len > 0 && **p == 0x00 ) | |
{ | |
++(*p); | |
--len; | |
} | |
/* this is only reached if the signature was invalid */ | |
if( len == 0 ) | |
return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED ); | |
/* if the msb is 1, ASN.1 requires that we prepend a 0. | |
* Neither r nor s can be 0, so we can assume len > 0 at all times. */ | |
if( **p & 0x80 ) | |
{ | |
if( *p - start < 1 ) | |
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); | |
*--(*p) = 0x00; | |
len += 1; | |
} | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, | |
MBEDTLS_ASN1_INTEGER ) ); | |
return( (int) len ); | |
} | |
/* Transcode signature from PSA format to ASN.1 sequence. | |
* See ecdsa_signature_to_asn1 in ecdsa.c, but with byte buffers instead of | |
* MPIs, and in-place. | |
* | |
* [in/out] sig: the signature pre- and post-transcoding | |
* [in/out] sig_len: signature length pre- and post-transcoding | |
* [int] buf_len: the available size the in/out buffer | |
*/ | |
static int pk_ecdsa_sig_asn1_from_psa( unsigned char *sig, size_t *sig_len, | |
size_t buf_len ) | |
{ | |
int ret; | |
size_t len = 0; | |
const size_t rs_len = *sig_len / 2; | |
unsigned char *p = sig + buf_len; | |
MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig + rs_len, rs_len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig, rs_len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, sig, len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, sig, | |
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ); | |
memmove( sig, p, len ); | |
*sig_len = len; | |
return( 0 ); | |
} | |
static int pk_opaque_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 ) | |
{ | |
const psa_key_handle_t *key = (const psa_key_handle_t *) ctx; | |
psa_algorithm_t alg = PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) ); | |
size_t bits, buf_len; | |
psa_status_t status; | |
/* PSA has its own RNG */ | |
(void) f_rng; | |
(void) p_rng; | |
/* PSA needs an output buffer of known size, but our API doesn't provide | |
* that information. Assume that the buffer is large enough for a | |
* maximal-length signature with that key (otherwise the application is | |
* buggy anyway). */ | |
status = psa_get_key_information( *key, NULL, &bits ); | |
if( status != PSA_SUCCESS ) | |
return( mbedtls_psa_err_translate_pk( status ) ); | |
buf_len = MBEDTLS_ECDSA_MAX_SIG_LEN( bits ); | |
/* make the signature */ | |
status = psa_asymmetric_sign( *key, alg, hash, hash_len, | |
sig, buf_len, sig_len ); | |
if( status != PSA_SUCCESS ) | |
return( mbedtls_psa_err_translate_pk( status ) ); | |
/* transcode it to ASN.1 sequence */ | |
return( pk_ecdsa_sig_asn1_from_psa( sig, sig_len, buf_len ) ); | |
} | |
const mbedtls_pk_info_t mbedtls_pk_opaque_info = { | |
MBEDTLS_PK_OPAQUE, | |
"Opaque", | |
pk_opaque_get_bitlen, | |
pk_opaque_can_do, | |
NULL, /* verify - will be done later */ | |
pk_opaque_sign_wrap, | |
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) | |
NULL, /* restartable verify - not relevant */ | |
NULL, /* restartable sign - not relevant */ | |
#endif | |
NULL, /* decrypt - will be done later */ | |
NULL, /* encrypt - will be done later */ | |
NULL, /* check_pair - could be done later or left NULL */ | |
pk_opaque_alloc_wrap, | |
pk_opaque_free_wrap, | |
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) | |
NULL, /* restart alloc - not relevant */ | |
NULL, /* restart free - not relevant */ | |
#endif | |
NULL, /* debug - could be done later, or even left NULL */ | |
}; | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#endif /* MBEDTLS_PK_C */ |