2 * Public Key abstraction layer: wrapper functions
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * This file is part of mbed TLS (https://tls.mbed.org)
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
25 #include MBEDTLS_CONFIG_FILE
28 #if defined(MBEDTLS_PK_C)
29 #include "mbedtls/pk_internal.h"
31 /* Even if RSA not activated, for the sake of RSA-alt */
32 #include "mbedtls/rsa.h"
36 #if defined(MBEDTLS_ECP_C)
37 #include "mbedtls/ecp.h"
40 #if defined(MBEDTLS_ECDSA_C)
41 #include "mbedtls/ecdsa.h"
44 #if defined(MBEDTLS_USE_PSA_CRYPTO)
45 #include "mbedtls/asn1write.h"
48 #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
49 #include "mbedtls/platform_util.h"
52 #if defined(MBEDTLS_USE_PSA_CRYPTO)
53 #include "psa/crypto.h"
54 #include "mbedtls/psa_util.h"
55 #include "mbedtls/asn1.h"
58 #if defined(MBEDTLS_PLATFORM_C)
59 #include "mbedtls/platform.h"
62 #define mbedtls_calloc calloc
63 #define mbedtls_free free
69 #if defined(MBEDTLS_RSA_C)
70 static int rsa_can_do( mbedtls_pk_type_t type )
72 return( type == MBEDTLS_PK_RSA ||
73 type == MBEDTLS_PK_RSASSA_PSS );
76 static size_t rsa_get_bitlen( const void *ctx )
78 const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx;
79 return( 8 * mbedtls_rsa_get_len( rsa ) );
82 static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
83 const unsigned char *hash, size_t hash_len,
84 const unsigned char *sig, size_t sig_len )
87 mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
88 size_t rsa_len = mbedtls_rsa_get_len( rsa );
90 #if SIZE_MAX > UINT_MAX
91 if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
92 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
93 #endif /* SIZE_MAX > UINT_MAX */
95 if( sig_len < rsa_len )
96 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
98 if( ( ret = mbedtls_rsa_pkcs1_verify( rsa, NULL, NULL,
99 MBEDTLS_RSA_PUBLIC, md_alg,
100 (unsigned int) hash_len, hash, sig ) ) != 0 )
103 /* The buffer contains a valid signature followed by extra data.
104 * We have a special error code for that so that so that callers can
105 * use mbedtls_pk_verify() to check "Does the buffer start with a
106 * valid signature?" and not just "Does the buffer contain a valid
108 if( sig_len > rsa_len )
109 return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
114 static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
115 const unsigned char *hash, size_t hash_len,
116 unsigned char *sig, size_t *sig_len,
117 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
119 mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
121 #if SIZE_MAX > UINT_MAX
122 if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
123 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
124 #endif /* SIZE_MAX > UINT_MAX */
126 *sig_len = mbedtls_rsa_get_len( rsa );
128 return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
129 md_alg, (unsigned int) hash_len, hash, sig ) );
132 static int rsa_decrypt_wrap( void *ctx,
133 const unsigned char *input, size_t ilen,
134 unsigned char *output, size_t *olen, size_t osize,
135 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
137 mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
139 if( ilen != mbedtls_rsa_get_len( rsa ) )
140 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
142 return( mbedtls_rsa_pkcs1_decrypt( rsa, f_rng, p_rng,
143 MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
146 static int rsa_encrypt_wrap( void *ctx,
147 const unsigned char *input, size_t ilen,
148 unsigned char *output, size_t *olen, size_t osize,
149 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
151 mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
152 *olen = mbedtls_rsa_get_len( rsa );
155 return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
157 return( mbedtls_rsa_pkcs1_encrypt( rsa, f_rng, p_rng, MBEDTLS_RSA_PUBLIC,
158 ilen, input, output ) );
161 static int rsa_check_pair_wrap( const void *pub, const void *prv )
163 return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
164 (const mbedtls_rsa_context *) prv ) );
167 static void *rsa_alloc_wrap( void )
169 void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );
172 mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );
177 static void rsa_free_wrap( void *ctx )
179 mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
183 static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )
185 items->type = MBEDTLS_PK_DEBUG_MPI;
186 items->name = "rsa.N";
187 items->value = &( ((mbedtls_rsa_context *) ctx)->N );
191 items->type = MBEDTLS_PK_DEBUG_MPI;
192 items->name = "rsa.E";
193 items->value = &( ((mbedtls_rsa_context *) ctx)->E );
196 const mbedtls_pk_info_t mbedtls_rsa_info = {
203 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
212 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
218 #endif /* MBEDTLS_RSA_C */
220 #if defined(MBEDTLS_ECP_C)
224 static int eckey_can_do( mbedtls_pk_type_t type )
226 return( type == MBEDTLS_PK_ECKEY ||
227 type == MBEDTLS_PK_ECKEY_DH ||
228 type == MBEDTLS_PK_ECDSA );
231 static size_t eckey_get_bitlen( const void *ctx )
233 return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
236 #if defined(MBEDTLS_ECDSA_C)
237 /* Forward declarations */
238 static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
239 const unsigned char *hash, size_t hash_len,
240 const unsigned char *sig, size_t sig_len );
242 static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
243 const unsigned char *hash, size_t hash_len,
244 unsigned char *sig, size_t *sig_len,
245 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
247 static int eckey_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
248 const unsigned char *hash, size_t hash_len,
249 const unsigned char *sig, size_t sig_len )
252 mbedtls_ecdsa_context ecdsa;
254 mbedtls_ecdsa_init( &ecdsa );
256 if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
257 ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
259 mbedtls_ecdsa_free( &ecdsa );
264 static int eckey_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
265 const unsigned char *hash, size_t hash_len,
266 unsigned char *sig, size_t *sig_len,
267 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
270 mbedtls_ecdsa_context ecdsa;
272 mbedtls_ecdsa_init( &ecdsa );
274 if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
275 ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
278 mbedtls_ecdsa_free( &ecdsa );
283 #if defined(MBEDTLS_ECP_RESTARTABLE)
284 /* Forward declarations */
285 static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
286 const unsigned char *hash, size_t hash_len,
287 const unsigned char *sig, size_t sig_len,
290 static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
291 const unsigned char *hash, size_t hash_len,
292 unsigned char *sig, size_t *sig_len,
293 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
297 * Restart context for ECDSA operations with ECKEY context
299 * We need to store an actual ECDSA context, as we need to pass the same to
300 * the underlying ecdsa function, so we can't create it on the fly every time.
304 mbedtls_ecdsa_restart_ctx ecdsa_rs;
305 mbedtls_ecdsa_context ecdsa_ctx;
308 static void *eckey_rs_alloc( void )
310 eckey_restart_ctx *rs_ctx;
312 void *ctx = mbedtls_calloc( 1, sizeof( eckey_restart_ctx ) );
317 mbedtls_ecdsa_restart_init( &rs_ctx->ecdsa_rs );
318 mbedtls_ecdsa_init( &rs_ctx->ecdsa_ctx );
324 static void eckey_rs_free( void *ctx )
326 eckey_restart_ctx *rs_ctx;
332 mbedtls_ecdsa_restart_free( &rs_ctx->ecdsa_rs );
333 mbedtls_ecdsa_free( &rs_ctx->ecdsa_ctx );
338 static int eckey_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
339 const unsigned char *hash, size_t hash_len,
340 const unsigned char *sig, size_t sig_len,
344 eckey_restart_ctx *rs = rs_ctx;
346 /* Should never happen */
348 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
350 /* set up our own sub-context if needed (that is, on first run) */
351 if( rs->ecdsa_ctx.grp.pbits == 0 )
352 MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );
354 MBEDTLS_MPI_CHK( ecdsa_verify_rs_wrap( &rs->ecdsa_ctx,
355 md_alg, hash, hash_len,
356 sig, sig_len, &rs->ecdsa_rs ) );
362 static int eckey_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
363 const unsigned char *hash, size_t hash_len,
364 unsigned char *sig, size_t *sig_len,
365 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
369 eckey_restart_ctx *rs = rs_ctx;
371 /* Should never happen */
373 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
375 /* set up our own sub-context if needed (that is, on first run) */
376 if( rs->ecdsa_ctx.grp.pbits == 0 )
377 MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );
379 MBEDTLS_MPI_CHK( ecdsa_sign_rs_wrap( &rs->ecdsa_ctx, md_alg,
380 hash, hash_len, sig, sig_len,
381 f_rng, p_rng, &rs->ecdsa_rs ) );
386 #endif /* MBEDTLS_ECP_RESTARTABLE */
387 #endif /* MBEDTLS_ECDSA_C */
389 static int eckey_check_pair( const void *pub, const void *prv )
391 return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
392 (const mbedtls_ecp_keypair *) prv ) );
395 static void *eckey_alloc_wrap( void )
397 void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
400 mbedtls_ecp_keypair_init( ctx );
405 static void eckey_free_wrap( void *ctx )
407 mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
411 static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )
413 items->type = MBEDTLS_PK_DEBUG_ECP;
414 items->name = "eckey.Q";
415 items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
418 const mbedtls_pk_info_t mbedtls_eckey_info = {
423 #if defined(MBEDTLS_ECDSA_C)
426 #if defined(MBEDTLS_ECP_RESTARTABLE)
427 eckey_verify_rs_wrap,
430 #else /* MBEDTLS_ECDSA_C */
433 #endif /* MBEDTLS_ECDSA_C */
439 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
447 * EC key restricted to ECDH
449 static int eckeydh_can_do( mbedtls_pk_type_t type )
451 return( type == MBEDTLS_PK_ECKEY ||
452 type == MBEDTLS_PK_ECKEY_DH );
455 const mbedtls_pk_info_t mbedtls_eckeydh_info = {
458 eckey_get_bitlen, /* Same underlying key structure */
462 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
469 eckey_alloc_wrap, /* Same underlying key structure */
470 eckey_free_wrap, /* Same underlying key structure */
471 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
475 eckey_debug, /* Same underlying key structure */
477 #endif /* MBEDTLS_ECP_C */
479 #if defined(MBEDTLS_ECDSA_C)
480 static int ecdsa_can_do( mbedtls_pk_type_t type )
482 return( type == MBEDTLS_PK_ECDSA );
485 #if defined(MBEDTLS_USE_PSA_CRYPTO)
487 * An ASN.1 encoded signature is a sequence of two ASN.1 integers. Parse one of
488 * those integers and convert it to the fixed-length encoding expected by PSA.
490 static int extract_ecdsa_sig_int( unsigned char **from, const unsigned char *end,
491 unsigned char *to, size_t to_len )
494 size_t unpadded_len, padding_len;
496 if( ( ret = mbedtls_asn1_get_tag( from, end, &unpadded_len,
497 MBEDTLS_ASN1_INTEGER ) ) != 0 )
502 while( unpadded_len > 0 && **from == 0x00 )
508 if( unpadded_len > to_len || unpadded_len == 0 )
509 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
511 padding_len = to_len - unpadded_len;
512 memset( to, 0x00, padding_len );
513 memcpy( to + padding_len, *from, unpadded_len );
514 ( *from ) += unpadded_len;
520 * Convert a signature from an ASN.1 sequence of two integers
521 * to a raw {r,s} buffer. Note: the provided sig buffer must be at least
522 * twice as big as int_size.
524 static int extract_ecdsa_sig( unsigned char **p, const unsigned char *end,
525 unsigned char *sig, size_t int_size )
530 if( ( ret = mbedtls_asn1_get_tag( p, end, &tmp_size,
531 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
535 if( ( ret = extract_ecdsa_sig_int( p, end, sig, int_size ) ) != 0 )
538 if( ( ret = extract_ecdsa_sig_int( p, end, sig + int_size, int_size ) ) != 0 )
544 static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
545 const unsigned char *hash, size_t hash_len,
546 const unsigned char *sig, size_t sig_len )
549 psa_key_handle_t key_slot;
550 psa_key_policy_t policy;
551 psa_key_type_t psa_type;
552 mbedtls_pk_context key;
554 /* see ECP_PUB_DER_MAX_BYTES in pkwrite.c */
555 unsigned char buf[30 + 2 * MBEDTLS_ECP_MAX_BYTES];
557 mbedtls_pk_info_t pk_info = mbedtls_eckey_info;
558 psa_algorithm_t psa_sig_md, psa_md;
559 psa_ecc_curve_t curve = mbedtls_psa_translate_ecc_group(
560 ( (mbedtls_ecdsa_context *) ctx )->grp.id );
561 const size_t signature_part_size = ( ( (mbedtls_ecdsa_context *) ctx )->grp.nbits + 7 ) / 8;
564 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
566 /* mbedtls_pk_write_pubkey() expects a full PK context;
567 * re-construct one to make it happy */
568 key.pk_info = &pk_info;
570 p = buf + sizeof( buf );
571 key_len = mbedtls_pk_write_pubkey( &p, buf, &key );
573 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
575 psa_md = mbedtls_psa_translate_md( md_alg );
577 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
578 psa_sig_md = PSA_ALG_ECDSA( psa_md );
579 psa_type = PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve );
581 if( ( ret = psa_allocate_key( &key_slot ) ) != PSA_SUCCESS )
582 return( mbedtls_psa_err_translate_pk( ret ) );
584 policy = psa_key_policy_init();
585 psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, psa_sig_md );
586 if( ( ret = psa_set_key_policy( key_slot, &policy ) ) != PSA_SUCCESS )
588 ret = mbedtls_psa_err_translate_pk( ret );
592 if( psa_import_key( key_slot, psa_type, buf + sizeof( buf ) - key_len, key_len )
595 ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
599 /* We don't need the exported key anymore and can
600 * reuse its buffer for signature extraction. */
601 if( 2 * signature_part_size > sizeof( buf ) )
603 ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
607 p = (unsigned char*) sig;
608 if( ( ret = extract_ecdsa_sig( &p, sig + sig_len, buf,
609 signature_part_size ) ) != 0 )
614 if( psa_asymmetric_verify( key_slot, psa_sig_md,
616 buf, 2 * signature_part_size )
619 ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
623 if( p != sig + sig_len )
625 ret = MBEDTLS_ERR_PK_SIG_LEN_MISMATCH;
631 psa_destroy_key( key_slot );
634 #else /* MBEDTLS_USE_PSA_CRYPTO */
635 static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
636 const unsigned char *hash, size_t hash_len,
637 const unsigned char *sig, size_t sig_len )
642 ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
643 hash, hash_len, sig, sig_len );
645 if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
646 return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
650 #endif /* MBEDTLS_USE_PSA_CRYPTO */
652 static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
653 const unsigned char *hash, size_t hash_len,
654 unsigned char *sig, size_t *sig_len,
655 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
657 return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,
658 md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );
661 #if defined(MBEDTLS_ECP_RESTARTABLE)
662 static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
663 const unsigned char *hash, size_t hash_len,
664 const unsigned char *sig, size_t sig_len,
670 ret = mbedtls_ecdsa_read_signature_restartable(
671 (mbedtls_ecdsa_context *) ctx,
672 hash, hash_len, sig, sig_len,
673 (mbedtls_ecdsa_restart_ctx *) rs_ctx );
675 if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
676 return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
681 static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
682 const unsigned char *hash, size_t hash_len,
683 unsigned char *sig, size_t *sig_len,
684 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
687 return( mbedtls_ecdsa_write_signature_restartable(
688 (mbedtls_ecdsa_context *) ctx,
689 md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng,
690 (mbedtls_ecdsa_restart_ctx *) rs_ctx ) );
693 #endif /* MBEDTLS_ECP_RESTARTABLE */
695 static void *ecdsa_alloc_wrap( void )
697 void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );
700 mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );
705 static void ecdsa_free_wrap( void *ctx )
707 mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );
711 #if defined(MBEDTLS_ECP_RESTARTABLE)
712 static void *ecdsa_rs_alloc( void )
714 void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_restart_ctx ) );
717 mbedtls_ecdsa_restart_init( ctx );
722 static void ecdsa_rs_free( void *ctx )
724 mbedtls_ecdsa_restart_free( ctx );
727 #endif /* MBEDTLS_ECP_RESTARTABLE */
729 const mbedtls_pk_info_t mbedtls_ecdsa_info = {
732 eckey_get_bitlen, /* Compatible key structures */
736 #if defined(MBEDTLS_ECP_RESTARTABLE)
737 ecdsa_verify_rs_wrap,
742 eckey_check_pair, /* Compatible key structures */
745 #if defined(MBEDTLS_ECP_RESTARTABLE)
749 eckey_debug, /* Compatible key structures */
751 #endif /* MBEDTLS_ECDSA_C */
753 #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
755 * Support for alternative RSA-private implementations
758 static int rsa_alt_can_do( mbedtls_pk_type_t type )
760 return( type == MBEDTLS_PK_RSA );
763 static size_t rsa_alt_get_bitlen( const void *ctx )
765 const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx;
767 return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
770 static int rsa_alt_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
771 const unsigned char *hash, size_t hash_len,
772 unsigned char *sig, size_t *sig_len,
773 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
775 mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
777 #if SIZE_MAX > UINT_MAX
778 if( UINT_MAX < hash_len )
779 return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
780 #endif /* SIZE_MAX > UINT_MAX */
782 *sig_len = rsa_alt->key_len_func( rsa_alt->key );
784 return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
785 md_alg, (unsigned int) hash_len, hash, sig ) );
788 static int rsa_alt_decrypt_wrap( void *ctx,
789 const unsigned char *input, size_t ilen,
790 unsigned char *output, size_t *olen, size_t osize,
791 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
793 mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
798 if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
799 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
801 return( rsa_alt->decrypt_func( rsa_alt->key,
802 MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
805 #if defined(MBEDTLS_RSA_C)
806 static int rsa_alt_check_pair( const void *pub, const void *prv )
808 unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
809 unsigned char hash[32];
813 if( rsa_alt_get_bitlen( prv ) != rsa_get_bitlen( pub ) )
814 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
816 memset( hash, 0x2a, sizeof( hash ) );
818 if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,
819 hash, sizeof( hash ),
820 sig, &sig_len, NULL, NULL ) ) != 0 )
825 if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,
826 hash, sizeof( hash ), sig, sig_len ) != 0 )
828 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
833 #endif /* MBEDTLS_RSA_C */
835 static void *rsa_alt_alloc_wrap( void )
837 void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );
840 memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );
845 static void rsa_alt_free_wrap( void *ctx )
847 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );
851 const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
858 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
862 rsa_alt_decrypt_wrap,
864 #if defined(MBEDTLS_RSA_C)
871 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
878 #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
880 #if defined(MBEDTLS_USE_PSA_CRYPTO)
882 static void *pk_opaque_alloc_wrap( void )
884 void *ctx = mbedtls_calloc( 1, sizeof( psa_key_handle_t ) );
886 /* no _init() function to call, an calloc() already zeroized */
891 static void pk_opaque_free_wrap( void *ctx )
893 mbedtls_platform_zeroize( ctx, sizeof( psa_key_handle_t ) );
897 static size_t pk_opaque_get_bitlen( const void *ctx )
899 const psa_key_handle_t *key = (const psa_key_handle_t *) ctx;
902 if( PSA_SUCCESS != psa_get_key_information( *key, NULL, &bits ) )
908 static int pk_opaque_can_do( mbedtls_pk_type_t type )
910 /* For now opaque PSA keys can only wrap ECC keypairs,
911 * as checked by setup_psa().
912 * Also, ECKEY_DH does not really make sense with the current API. */
913 return( type == MBEDTLS_PK_ECKEY ||
914 type == MBEDTLS_PK_ECDSA );
918 * Simultaneously convert and move raw MPI from the beginning of a buffer
919 * to an ASN.1 MPI at the end of the buffer.
920 * See also mbedtls_asn1_write_mpi().
922 * p: pointer to the end of the output buffer
923 * start: start of the output buffer, and also of the mpi to write at the end
924 * n_len: length of the mpi to read from start
926 static int asn1_write_mpibuf( unsigned char **p, unsigned char *start,
932 if( (size_t)( *p - start ) < n_len )
933 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
937 memmove( *p, start, len );
939 /* ASN.1 DER encoding requires minimal length, so skip leading 0s.
940 * Neither r nor s should be 0, but as a failsafe measure, still detect
941 * that rather than overflowing the buffer in case of a PSA error. */
942 while( len > 0 && **p == 0x00 )
948 /* this is only reached if the signature was invalid */
950 return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED );
952 /* if the msb is 1, ASN.1 requires that we prepend a 0.
953 * Neither r nor s can be 0, so we can assume len > 0 at all times. */
957 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
963 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
964 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
965 MBEDTLS_ASN1_INTEGER ) );
970 /* Transcode signature from PSA format to ASN.1 sequence.
971 * See ecdsa_signature_to_asn1 in ecdsa.c, but with byte buffers instead of
972 * MPIs, and in-place.
974 * [in/out] sig: the signature pre- and post-transcoding
975 * [in/out] sig_len: signature length pre- and post-transcoding
976 * [int] buf_len: the available size the in/out buffer
978 static int pk_ecdsa_sig_asn1_from_psa( unsigned char *sig, size_t *sig_len,
983 const size_t rs_len = *sig_len / 2;
984 unsigned char *p = sig + buf_len;
986 MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig + rs_len, rs_len ) );
987 MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig, rs_len ) );
989 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, sig, len ) );
990 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, sig,
991 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
993 memmove( sig, p, len );
999 static int pk_opaque_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
1000 const unsigned char *hash, size_t hash_len,
1001 unsigned char *sig, size_t *sig_len,
1002 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
1004 const psa_key_handle_t *key = (const psa_key_handle_t *) ctx;
1005 psa_algorithm_t alg = PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) );
1006 size_t bits, buf_len;
1007 psa_status_t status;
1009 /* PSA has its own RNG */
1013 /* PSA needs an output buffer of known size, but our API doesn't provide
1014 * that information. Assume that the buffer is large enough for a
1015 * maximal-length signature with that key (otherwise the application is
1017 status = psa_get_key_information( *key, NULL, &bits );
1018 if( status != PSA_SUCCESS )
1019 return( mbedtls_psa_err_translate_pk( status ) );
1021 buf_len = MBEDTLS_ECDSA_MAX_SIG_LEN( bits );
1023 /* make the signature */
1024 status = psa_asymmetric_sign( *key, alg, hash, hash_len,
1025 sig, buf_len, sig_len );
1026 if( status != PSA_SUCCESS )
1027 return( mbedtls_psa_err_translate_pk( status ) );
1029 /* transcode it to ASN.1 sequence */
1030 return( pk_ecdsa_sig_asn1_from_psa( sig, sig_len, buf_len ) );
1033 const mbedtls_pk_info_t mbedtls_pk_opaque_info = {
1036 pk_opaque_get_bitlen,
1038 NULL, /* verify - will be done later */
1039 pk_opaque_sign_wrap,
1040 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
1041 NULL, /* restartable verify - not relevant */
1042 NULL, /* restartable sign - not relevant */
1044 NULL, /* decrypt - will be done later */
1045 NULL, /* encrypt - will be done later */
1046 NULL, /* check_pair - could be done later or left NULL */
1047 pk_opaque_alloc_wrap,
1048 pk_opaque_free_wrap,
1049 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
1050 NULL, /* restart alloc - not relevant */
1051 NULL, /* restart free - not relevant */
1053 NULL, /* debug - could be done later, or even left NULL */
1056 #endif /* MBEDTLS_USE_PSA_CRYPTO */
1058 #endif /* MBEDTLS_PK_C */