| /* |
| * Public Key abstraction layer: wrapper functions |
| * |
| * 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_PK_C) |
| #include "pk_wrap.h" |
| #include "mbedtls/error.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_ERR_ERROR_CORRUPTION_DETECTED; |
| 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, 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, |
| 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, |
| 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, |
| ilen, input, output ) ); |
| } |
| |
| static int rsa_check_pair_wrap( const void *pub, const void *prv, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng ) |
| { |
| (void) f_rng; |
| (void) p_rng; |
| 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 ); |
| |
| 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 ) |
| { |
| #if defined(MBEDTLS_RSA_ALT) |
| /* Not supported */ |
| (void) ctx; |
| (void) items; |
| #else |
| 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 ); |
| #endif |
| } |
| |
| 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_ERR_ERROR_CORRUPTION_DETECTED; |
| 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_ERR_ERROR_CORRUPTION_DETECTED; |
| 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 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, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng ) |
| { |
| return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub, |
| (const mbedtls_ecp_keypair *) prv, |
| f_rng, p_rng ) ); |
| } |
| |
| 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 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_arg, mbedtls_md_type_t md_alg, |
| const unsigned char *hash, size_t hash_len, |
| const unsigned char *sig, size_t sig_len ) |
| { |
| mbedtls_ecdsa_context *ctx = ctx_arg; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; |
| psa_key_id_t key_id = 0; |
| psa_status_t status; |
| 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_ALG_ECDSA_ANY; |
| size_t curve_bits; |
| psa_ecc_family_t curve = |
| mbedtls_ecc_group_to_psa( ctx->grp.id, &curve_bits ); |
| const size_t signature_part_size = ( ctx->grp.nbits + 7 ) / 8; |
| ((void) md_alg); |
| |
| 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_set_key_type( &attributes, PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve ) ); |
| psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY_HASH ); |
| psa_set_key_algorithm( &attributes, psa_sig_md ); |
| |
| status = psa_import_key( &attributes, |
| buf + sizeof( buf ) - key_len, key_len, |
| &key_id ); |
| if( status != PSA_SUCCESS ) |
| { |
| ret = mbedtls_psa_err_translate_pk( status ); |
| 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_verify_hash( key_id, 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_id ); |
| 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| ((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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| ((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 ); |
| if( *sig_len > MBEDTLS_PK_SIGNATURE_MAX_SIZE ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, |
| 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, |
| olen, input, output, osize ) ); |
| } |
| |
| #if defined(MBEDTLS_RSA_C) |
| static int rsa_alt_check_pair( const void *pub, const void *prv, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng ) |
| { |
| unsigned char sig[MBEDTLS_MPI_MAX_SIZE]; |
| unsigned char hash[32]; |
| size_t sig_len = 0; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| 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, f_rng, p_rng ) ) != 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_id_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_id_t ) ); |
| mbedtls_free( ctx ); |
| } |
| |
| static size_t pk_opaque_get_bitlen( const void *ctx ) |
| { |
| const psa_key_id_t *key = (const psa_key_id_t *) ctx; |
| size_t bits; |
| psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; |
| |
| if( PSA_SUCCESS != psa_get_key_attributes( *key, &attributes ) ) |
| return( 0 ); |
| |
| bits = psa_get_key_bits( &attributes ); |
| psa_reset_key_attributes( &attributes ); |
| 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 ); |
| } |
| |
| #if defined(MBEDTLS_ECDSA_C) |
| |
| /* |
| * 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 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_PLATFORM_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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| 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 ); |
| } |
| |
| #endif /* MBEDTLS_ECDSA_C */ |
| |
| 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 ) |
| { |
| #if !defined(MBEDTLS_ECDSA_C) |
| ((void) ctx); |
| ((void) md_alg); |
| ((void) hash); |
| ((void) hash_len); |
| ((void) sig); |
| ((void) sig_len); |
| ((void) f_rng); |
| ((void) p_rng); |
| return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
| #else /* !MBEDTLS_ECDSA_C */ |
| const psa_key_id_t *key = (const psa_key_id_t *) ctx; |
| psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; |
| psa_algorithm_t alg = PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) ); |
| size_t 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_attributes( *key, &attributes ); |
| if( status != PSA_SUCCESS ) |
| return( mbedtls_psa_err_translate_pk( status ) ); |
| buf_len = MBEDTLS_ECDSA_MAX_SIG_LEN( psa_get_key_bits( &attributes ) ); |
| psa_reset_key_attributes( &attributes ); |
| if( buf_len > MBEDTLS_PK_SIGNATURE_MAX_SIZE ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| /* make the signature */ |
| status = psa_sign_hash( *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 ) ); |
| #endif /* !MBEDTLS_ECDSA_C */ |
| } |
| |
| 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 */ |
