| /* |
| * Public Key abstraction layer |
| * |
| * 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.h" |
| #include "mbedtls/pk_internal.h" |
| |
| #if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PK_RSA_ALT_SUPPORT) |
| #include "mbedtls/rsa.h" |
| #endif |
| #if defined(MBEDTLS_ECP_C) |
| #include "mbedtls/ecp.h" |
| #endif |
| #if defined(MBEDTLS_ECDSA_C) |
| #include "mbedtls/ecdsa.h" |
| #endif |
| #if defined(MBEDTLS_USE_TINYCRYPT) |
| #include "tinycrypt/ecc.h" |
| #include "tinycrypt/ecc_dsa.h" |
| #include "mbedtls/asn1.h" |
| #include "mbedtls/asn1write.h" |
| #endif /* MBEDTLS_USE_TINYCRYPT */ |
| |
| #include "mbedtls/platform_util.h" |
| #include "mbedtls/platform.h" |
| |
| #if !defined(MBEDTLS_PLATFORM_C) |
| #include <stdlib.h> |
| #define mbedtls_calloc calloc |
| #define mbedtls_free free |
| #endif |
| |
| #include <string.h> |
| #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 ) |
| |
| /* |
| * Internal wrappers around RSA functions |
| */ |
| #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 */ |
| |
| /* |
| * Internal wrappers around ECC functions - based on ECP module |
| */ |
| #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 */ |
| |
| /* |
| * Internal wrappers around ECC functions - based on TinyCrypt |
| */ |
| #if defined(MBEDTLS_USE_TINYCRYPT) |
| /* |
| * 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. |
| */ |
| 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 ); |
| mbedtls_platform_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 size_t uecc_eckey_get_bitlen( const void *ctx ) |
| { |
| (void) ctx; |
| return( (size_t) ( NUM_ECC_BYTES * 8 ) ); |
| } |
| |
| static int uecc_eckey_check_pair( const void *pub, const void *prv ) |
| { |
| const mbedtls_uecc_keypair *uecc_pub = |
| (const mbedtls_uecc_keypair *) pub; |
| const mbedtls_uecc_keypair *uecc_prv = |
| (const mbedtls_uecc_keypair *) prv; |
| |
| if( mbedtls_platform_memcmp( uecc_pub->public_key, |
| uecc_prv->public_key, |
| 2 * NUM_ECC_BYTES ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| } |
| |
| static int uecc_eckey_can_do( mbedtls_pk_type_t type ) |
| { |
| return( type == MBEDTLS_PK_ECDSA || |
| type == MBEDTLS_PK_ECKEY ); |
| } |
| |
| static int uecc_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_PLATFORM_FAULT_DETECTED; |
| volatile int ret_fi = UECC_FAULT_DETECTED; |
| uint8_t signature[2*NUM_ECC_BYTES]; |
| unsigned char *p; |
| const mbedtls_uecc_keypair *keypair = (const mbedtls_uecc_keypair *) ctx; |
| |
| ((void) md_alg); |
| p = (unsigned char*) sig; |
| |
| ret = extract_ecdsa_sig( &p, sig + sig_len, signature, NUM_ECC_BYTES ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| ret_fi = uECC_verify( keypair->public_key, hash, |
| (unsigned) hash_len, signature ); |
| |
| if( ret_fi == UECC_FAULT_DETECTED ) |
| return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED ); |
| |
| if( ret_fi == UECC_SUCCESS ) |
| { |
| mbedtls_platform_random_delay(); |
| if( ret_fi == UECC_SUCCESS ) |
| return( 0 ); |
| else |
| return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED ); |
| } |
| |
| return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED ); |
| } |
| |
| /* |
| * 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 |
| * |
| * Warning: |
| * The total length of the output buffer must be smaller than 128 Bytes. |
| */ |
| static int asn1_write_mpibuf( unsigned char **p, unsigned char *start, |
| size_t n_len ) |
| { |
| size_t len = 0; |
| int ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED; |
| |
| if( (size_t)( *p - start ) < n_len ) |
| return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
| |
| len = n_len; |
| *p -= len; |
| ret = mbedtls_platform_memmove( *p, start, len ); |
| if( ret != 0 ) |
| { |
| return( ret ); |
| } |
| |
| /* 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 an 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; |
| } |
| |
| /* The ASN.1 length encoding is just a single Byte containing the length, |
| * as we assume that the total buffer length is smaller than 128 Bytes. */ |
| *--(*p) = len; |
| *--(*p) = MBEDTLS_ASN1_INTEGER; |
| len += 2; |
| |
| return( (int) len ); |
| } |
| |
| /* Transcode signature from uECC 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 |
| * |
| * Warning: buf_len must be smaller than 128 Bytes. |
| */ |
| static int pk_ecdsa_sig_asn1_from_uecc( unsigned char *sig, size_t *sig_len, |
| size_t buf_len ) |
| { |
| int ret = MBEDTLS_ERR_PLATFORM_FAULT_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 ) ); |
| |
| /* The ASN.1 length encoding is just a single Byte containing the length, |
| * as we assume that the total buffer length is smaller than 128 Bytes. */ |
| *--p = len; |
| *--p = MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE; |
| len += 2; |
| |
| ret = mbedtls_platform_memmove( sig, p, len ); |
| if( ret != 0 ) |
| { |
| return( ret ); |
| } |
| *sig_len = len; |
| |
| return( ret ); |
| } |
| |
| static int uecc_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 ) |
| { |
| const mbedtls_uecc_keypair *keypair = (const mbedtls_uecc_keypair *) ctx; |
| int ret; |
| |
| /* |
| * RFC-4492 page 20: |
| * |
| * Ecdsa-Sig-Value ::= SEQUENCE { |
| * r INTEGER, |
| * s INTEGER |
| * } |
| * |
| * Size is at most |
| * 1 (tag) + 1 (len) + 1 (initial 0) + NUM_ECC_BYTES for each of r and s, |
| * twice that + 1 (tag) + 2 (len) for the sequence |
| * |
| * (The ASN.1 length encodings are all 1-Byte encodings because |
| * the total size is smaller than 128 Bytes). |
| */ |
| #define MAX_SECP256R1_ECDSA_SIG_LEN ( 3 + 2 * ( 3 + NUM_ECC_BYTES ) ) |
| |
| ret = uECC_sign( keypair->private_key, hash, hash_len, sig ); |
| if( ret == UECC_FAULT_DETECTED ) |
| return( MBEDTLS_ERR_PLATFORM_FAULT_DETECTED ); |
| if( ret != UECC_SUCCESS ) |
| return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED ); |
| |
| *sig_len = 2 * NUM_ECC_BYTES; |
| |
| /* uECC owns its rng function pointer */ |
| (void) f_rng; |
| (void) p_rng; |
| (void) md_alg; |
| |
| return( pk_ecdsa_sig_asn1_from_uecc( sig, sig_len, |
| MAX_SECP256R1_ECDSA_SIG_LEN ) ); |
| |
| #undef MAX_SECP256R1_ECDSA_SIG_LEN |
| } |
| |
| #if !defined(MBEDTLS_PK_SINGLE_TYPE) |
| static void *uecc_eckey_alloc_wrap( void ) |
| { |
| return( mbedtls_calloc( 1, sizeof( mbedtls_uecc_keypair ) ) ); |
| } |
| |
| static void uecc_eckey_free_wrap( void *ctx ) |
| { |
| if( ctx == NULL ) |
| return; |
| |
| mbedtls_platform_zeroize( ctx, sizeof( mbedtls_uecc_keypair ) ); |
| mbedtls_free( ctx ); |
| } |
| #endif /* MBEDTLS_PK_SINGLE_TYPE */ |
| |
| #if !defined(MBEDTLS_PK_SINGLE_TYPE) |
| const mbedtls_pk_info_t mbedtls_uecc_eckey_info = |
| MBEDTLS_PK_INFO( MBEDTLS_PK_INFO_ECKEY ); |
| #endif |
| #endif /* MBEDTLS_USE_TINYCRYPT */ |
| |
| /* |
| * Internal wrappers around ECDSA functions |
| */ |
| #if defined(MBEDTLS_ECDSA_C) |
| static int ecdsa_can_do( mbedtls_pk_type_t type ) |
| { |
| return( type == MBEDTLS_PK_ECDSA ); |
| } |
| |
| 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 ); |
| } |
| |
| 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 */ |
| |
| /* |
| * Internal wrappers for RSA-alt support |
| */ |
| #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT) |
| 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 ); |
| |
| mbedtls_platform_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 ) |
| mbedtls_platform_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 */ |
| |
| /* |
| * Access to members of the pk_info structure. When a single PK type is |
| * hardcoded, these should have zero runtime cost; otherwise, the usual |
| * dynamic dispatch based on pk_info is used. |
| * |
| * 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 this is builds |
| * with MBEDTLS_USE_TINYCRYPT, which don't have MBEDTLS_ECP_RESTARTABLE. |
| */ |
| #if defined(MBEDTLS_PK_SINGLE_TYPE) |
| |
| MBEDTLS_ALWAYS_INLINE static inline mbedtls_pk_type_t pk_info_type( |
| mbedtls_pk_handle_t info ) |
| { |
| (void) info; |
| return( MBEDTLS_PK_INFO_TYPE( MBEDTLS_PK_SINGLE_TYPE ) ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline const char * pk_info_name( |
| mbedtls_pk_handle_t info ) |
| { |
| (void) info; |
| return( MBEDTLS_PK_INFO_NAME( MBEDTLS_PK_SINGLE_TYPE ) ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline size_t pk_info_get_bitlen( |
| mbedtls_pk_handle_t info, const void *ctx ) |
| { |
| (void) info; |
| return( MBEDTLS_PK_INFO_GET_BITLEN( MBEDTLS_PK_SINGLE_TYPE )( ctx ) ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_can_do( |
| mbedtls_pk_handle_t info, mbedtls_pk_type_t type ) |
| { |
| (void) info; |
| return( MBEDTLS_PK_INFO_CAN_DO( MBEDTLS_PK_SINGLE_TYPE )( type ) ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_verify_func( |
| mbedtls_pk_handle_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 ) |
| { |
| (void) info; |
| #if MBEDTLS_PK_INFO_VERIFY_OMIT( MBEDTLS_PK_SINGLE_TYPE ) |
| (void) ctx; |
| (void) md_alg; |
| (void) hash; |
| (void) hash_len; |
| (void) sig; |
| (void) sig_len; |
| return( MBEDTLS_ERR_PK_TYPE_MISMATCH ); |
| #else |
| return( MBEDTLS_PK_INFO_VERIFY_FUNC( MBEDTLS_PK_SINGLE_TYPE )( |
| ctx, md_alg, hash, hash_len, sig, sig_len ) ); |
| #endif |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_sign_func( |
| mbedtls_pk_handle_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 ) |
| { |
| (void) info; |
| #if MBEDTLS_PK_INFO_SIGN_OMIT( MBEDTLS_PK_SINGLE_TYPE ) |
| (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_TYPE_MISMATCH ); |
| #else |
| return( MBEDTLS_PK_INFO_SIGN_FUNC( MBEDTLS_PK_SINGLE_TYPE )( |
| ctx, md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) ); |
| #endif |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_decrypt_func( |
| mbedtls_pk_handle_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 ) |
| { |
| (void) info; |
| #if MBEDTLS_PK_INFO_DECRYPT_OMIT( MBEDTLS_PK_SINGLE_TYPE ) |
| (void) ctx; |
| (void) input; |
| (void) ilen; |
| (void) output; |
| (void) olen; |
| (void) osize; |
| (void) f_rng; |
| (void) p_rng; |
| return( MBEDTLS_ERR_PK_TYPE_MISMATCH ); |
| #else |
| return( MBEDTLS_PK_INFO_DECRYPT_FUNC( MBEDTLS_PK_SINGLE_TYPE )( |
| ctx, input, ilen, output, olen, osize, f_rng, p_rng ) ); |
| #endif |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_encrypt_func( |
| mbedtls_pk_handle_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 ) |
| { |
| (void) info; |
| #if MBEDTLS_PK_INFO_ENCRYPT_OMIT( MBEDTLS_PK_SINGLE_TYPE ) |
| (void) ctx; |
| (void) input; |
| (void) ilen; |
| (void) output; |
| (void) olen; |
| (void) osize; |
| (void) f_rng; |
| (void) p_rng; |
| return( MBEDTLS_ERR_PK_TYPE_MISMATCH ); |
| #else |
| return( MBEDTLS_PK_INFO_ENCRYPT_FUNC( MBEDTLS_PK_SINGLE_TYPE )( |
| ctx, input, ilen, output, olen, osize, f_rng, p_rng ) ); |
| #endif |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_check_pair_func( |
| mbedtls_pk_handle_t info, const void *pub, const void *prv ) |
| { |
| (void) info; |
| #if MBEDTLS_PK_INFO_CHECK_PAIR_OMIT( MBEDTLS_PK_SINGLE_TYPE ) |
| (void) pub; |
| (void) prv; |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| #else |
| return( MBEDTLS_PK_INFO_CHECK_PAIR_FUNC( MBEDTLS_PK_SINGLE_TYPE )( |
| pub, prv ) ); |
| #endif |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_debug_func( |
| mbedtls_pk_handle_t info, |
| const void *ctx, mbedtls_pk_debug_item *items ) |
| { |
| (void) info; |
| #if MBEDTLS_PK_INFO_DEBUG_OMIT( MBEDTLS_PK_SINGLE_TYPE ) |
| (void) ctx; |
| (void) items; |
| return( MBEDTLS_ERR_PK_TYPE_MISMATCH ); |
| #else |
| return( MBEDTLS_PK_INFO_DEBUG_FUNC( MBEDTLS_PK_SINGLE_TYPE )( ctx, items ) ); |
| #endif |
| } |
| |
| #else /* MBEDTLS_PK_SINGLE_TYPE */ |
| |
| MBEDTLS_ALWAYS_INLINE static inline mbedtls_pk_type_t pk_info_type( |
| mbedtls_pk_handle_t info ) |
| { |
| return( info->type ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline const char * pk_info_name( |
| mbedtls_pk_handle_t info ) |
| { |
| return( info->name ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline size_t pk_info_get_bitlen( |
| mbedtls_pk_handle_t info, const void *ctx ) |
| { |
| return( info->get_bitlen( ctx ) ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_can_do( |
| mbedtls_pk_handle_t info, mbedtls_pk_type_t type ) |
| { |
| return( info->can_do( type ) ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_verify_func( |
| mbedtls_pk_handle_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( |
| mbedtls_pk_handle_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( |
| mbedtls_pk_handle_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( |
| mbedtls_pk_handle_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( |
| mbedtls_pk_handle_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( |
| mbedtls_pk_handle_t info ) |
| { |
| return( info->ctx_alloc_func( ) ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline void pk_info_ctx_free_func( |
| mbedtls_pk_handle_t info, void *ctx ) |
| { |
| info->ctx_free_func( ctx ); |
| } |
| |
| MBEDTLS_ALWAYS_INLINE static inline int pk_info_debug_func( |
| mbedtls_pk_handle_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 ); |
| } |
| |
| #endif /* MBEDTLS_PK_SINGLE_TYPE */ |
| |
| /* |
| * Initialise a mbedtls_pk_context |
| */ |
| void mbedtls_pk_init( mbedtls_pk_context *ctx ) |
| { |
| PK_VALIDATE( ctx != NULL ); |
| |
| #if !defined(MBEDTLS_PK_SINGLE_TYPE) |
| ctx->pk_info = MBEDTLS_PK_INVALID_HANDLE; |
| ctx->pk_ctx = NULL; |
| #else |
| memset( ctx, 0, sizeof( mbedtls_pk_context ) ); |
| #endif |
| } |
| |
| /* |
| * Free (the components of) a mbedtls_pk_context |
| */ |
| void mbedtls_pk_free( mbedtls_pk_context *ctx ) |
| { |
| if( ctx == NULL ) |
| return; |
| |
| #if !defined(MBEDTLS_PK_SINGLE_TYPE) |
| if( MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| pk_info_ctx_free_func( MBEDTLS_PK_CTX_INFO( ctx ), ctx->pk_ctx ); |
| #endif |
| |
| 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 || !MBEDTLS_PK_CTX_IS_VALID( ctx ) || |
| ctx->pk_info->rs_free_func == NULL ) |
| { |
| return; |
| } |
| |
| ctx->pk_info->rs_free_func( ctx->rs_ctx ); |
| |
| ctx->pk_info = MBEDTLS_PK_INVALID_HANDLE; |
| ctx->rs_ctx = NULL; |
| } |
| #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ |
| |
| /* |
| * Get pk_info structure from type |
| */ |
| mbedtls_pk_handle_t mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type ) |
| { |
| #if defined(MBEDTLS_PK_SINGLE_TYPE) |
| if( pk_type == MBEDTLS_PK_INFO_TYPE( MBEDTLS_PK_SINGLE_TYPE ) ) |
| return( MBEDTLS_PK_UNIQUE_VALID_HANDLE ); |
| |
| return( MBEDTLS_PK_INVALID_HANDLE ); |
| |
| #else /* MBEDTLS_PK_SINGLE_TYPE */ |
| |
| switch( pk_type ) { |
| #if defined(MBEDTLS_RSA_C) |
| case MBEDTLS_PK_RSA: |
| return( &mbedtls_rsa_info ); |
| #endif |
| #if defined(MBEDTLS_ECP_C) |
| case MBEDTLS_PK_ECKEY_DH: |
| return( &mbedtls_eckeydh_info ); |
| #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: |
| return( NULL ); |
| } |
| #endif /* MBEDTLS_PK_SINGLE_TYPE */ |
| } |
| |
| /* |
| * Initialise context |
| */ |
| int mbedtls_pk_setup( mbedtls_pk_context *ctx, mbedtls_pk_handle_t info ) |
| { |
| PK_VALIDATE_RET( ctx != NULL ); |
| if( info == MBEDTLS_PK_INVALID_HANDLE ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| #if !defined(MBEDTLS_PK_SINGLE_TYPE) |
| if( ctx->pk_info != NULL ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| ctx->pk_info = info; |
| |
| if( ( ctx->pk_ctx = pk_info_ctx_alloc_func( info ) ) == NULL ) |
| return( MBEDTLS_ERR_PK_ALLOC_FAILED ); |
| #else |
| (void) ctx; |
| #endif |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT) |
| /* |
| * Initialize an RSA-alt context |
| */ |
| 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 ) |
| { |
| mbedtls_rsa_alt_context *rsa_alt; |
| mbedtls_pk_handle_t info = &mbedtls_rsa_alt_info; |
| |
| PK_VALIDATE_RET( ctx != NULL ); |
| if( MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL ) |
| return( MBEDTLS_ERR_PK_ALLOC_FAILED ); |
| |
| ctx->pk_info = info; |
| |
| rsa_alt = (mbedtls_rsa_alt_context *) ctx->pk_ctx; |
| |
| 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 */ |
| |
| /* |
| * 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 || !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( 0 ); |
| |
| return( pk_info_can_do( MBEDTLS_PK_CTX_INFO( ctx ), 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, |
| mbedtls_pk_handle_t info ) |
| { |
| /* Don't do anything if already set up or invalid */ |
| if( ctx == NULL || MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| 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 ) |
| { |
| volatile int verify_ret = MBEDTLS_ERR_PK_HW_ACCEL_FAILED; |
| PK_VALIDATE_RET( ctx != NULL ); |
| PK_VALIDATE_RET( ( md_alg == MBEDTLS_MD_NONE && hash_len == 0 ) || |
| hash != NULL ); |
| PK_VALIDATE_RET( sig != NULL ); |
| |
| if( !MBEDTLS_PK_CTX_IS_VALID( ctx ) || |
| 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 && |
| 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 */ |
| |
| verify_ret = pk_info_verify_func( MBEDTLS_PK_CTX_INFO( ctx ), |
| ctx->pk_ctx, md_alg, hash, hash_len, sig, sig_len ); |
| |
| if( verify_ret == 0 ) |
| { |
| mbedtls_platform_random_delay(); |
| if( verify_ret == 0 ) |
| { |
| return( verify_ret ); |
| } |
| else |
| { |
| verify_ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED; |
| } |
| } |
| |
| return( verify_ret ); |
| } |
| |
| /* |
| * 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 ) ); |
| } |
| |
| /* |
| * 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, |
| 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( !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| if( ! mbedtls_pk_can_do( ctx, type ) ) |
| return( MBEDTLS_ERR_PK_TYPE_MISMATCH ); |
| |
| if( type == MBEDTLS_PK_RSASSA_PSS ) |
| { |
| #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21) |
| int ret; |
| const mbedtls_pk_rsassa_pss_options *pss_opts; |
| |
| #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( options == NULL ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| pss_opts = (const mbedtls_pk_rsassa_pss_options *) options; |
| |
| if( sig_len < mbedtls_pk_get_len( ctx ) ) |
| return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
| |
| ret = mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_pk_rsa( *ctx ), |
| NULL, NULL, MBEDTLS_RSA_PUBLIC, |
| md_alg, (unsigned int) hash_len, hash, |
| 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 ); |
| |
| return( 0 ); |
| #else |
| return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
| #endif /* MBEDTLS_RSA_C && MBEDTLS_PKCS1_V21 */ |
| } |
| |
| /* General case: no options */ |
| if( options != NULL ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| return( mbedtls_pk_verify( ctx, md_alg, hash, hash_len, sig, sig_len ) ); |
| } |
| |
| /* |
| * Make a signature (restartable) |
| */ |
| int mbedtls_pk_sign_restartable( 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, |
| 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( !MBEDTLS_PK_CTX_IS_VALID( ctx ) || |
| 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 && |
| 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( MBEDTLS_PK_CTX_INFO( ctx ), ctx->pk_ctx, |
| md_alg, hash, hash_len, 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 ) ); |
| } |
| |
| /* |
| * Decrypt message |
| */ |
| int mbedtls_pk_decrypt( mbedtls_pk_context *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 ) |
| { |
| 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( !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| return( pk_info_decrypt_func( MBEDTLS_PK_CTX_INFO( ctx ), ctx->pk_ctx, |
| input, ilen, output, olen, osize, f_rng, p_rng ) ); |
| } |
| |
| /* |
| * Encrypt message |
| */ |
| int mbedtls_pk_encrypt( mbedtls_pk_context *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 ) |
| { |
| 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( !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| return( pk_info_encrypt_func( MBEDTLS_PK_CTX_INFO( ctx ), ctx->pk_ctx, |
| input, ilen, output, olen, osize, f_rng, p_rng ) ); |
| } |
| |
| /* |
| * Check public-private key pair |
| */ |
| int mbedtls_pk_check_pair( const mbedtls_pk_context *pub, const mbedtls_pk_context *prv ) |
| { |
| PK_VALIDATE_RET( pub != NULL ); |
| PK_VALIDATE_RET( prv != NULL ); |
| |
| if( !MBEDTLS_PK_CTX_IS_VALID( pub ) || !MBEDTLS_PK_CTX_IS_VALID( prv ) ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT) |
| if( pk_info_type( prv->pk_info ) == MBEDTLS_PK_RSA_ALT ) |
| { |
| if( pk_info_type( pub->pk_info ) != MBEDTLS_PK_RSA ) |
| return( MBEDTLS_ERR_PK_TYPE_MISMATCH ); |
| } |
| else |
| #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */ |
| { |
| if( MBEDTLS_PK_CTX_INFO( pub ) != MBEDTLS_PK_CTX_INFO( prv ) ) |
| return( MBEDTLS_ERR_PK_TYPE_MISMATCH ); |
| } |
| |
| return( pk_info_check_pair_func( MBEDTLS_PK_CTX_INFO( prv ), |
| pub->pk_ctx, prv->pk_ctx ) ); |
| } |
| |
| /* |
| * 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 || !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( 0 ); |
| |
| return( pk_info_get_bitlen( MBEDTLS_PK_CTX_INFO( ctx ), 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( !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); |
| |
| return( pk_info_debug_func( MBEDTLS_PK_CTX_INFO( ctx ), ctx->pk_ctx, items ) ); |
| } |
| |
| /* |
| * Access the PK type name |
| */ |
| const char *mbedtls_pk_get_name( const mbedtls_pk_context *ctx ) |
| { |
| if( ctx == NULL || !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( "invalid PK" ); |
| |
| return( pk_info_name( MBEDTLS_PK_CTX_INFO( ctx ) ) ); |
| } |
| |
| /* |
| * Access the PK type |
| */ |
| mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx ) |
| { |
| if( ctx == NULL || !MBEDTLS_PK_CTX_IS_VALID( ctx ) ) |
| return( MBEDTLS_PK_NONE ); |
| |
| return( pk_info_type( MBEDTLS_PK_CTX_INFO( ctx ) ) ); |
| } |
| |
| #endif /* MBEDTLS_PK_C */ |