--- /dev/null
+/*\r
+ * Public Key abstraction layer: wrapper functions\r
+ *\r
+ * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved\r
+ * SPDX-License-Identifier: Apache-2.0\r
+ *\r
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may\r
+ * not use this file except in compliance with the License.\r
+ * You may obtain a copy of the License at\r
+ *\r
+ * http://www.apache.org/licenses/LICENSE-2.0\r
+ *\r
+ * Unless required by applicable law or agreed to in writing, software\r
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT\r
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ * See the License for the specific language governing permissions and\r
+ * limitations under the License.\r
+ *\r
+ * This file is part of mbed TLS (https://tls.mbed.org)\r
+ */\r
+\r
+#if !defined(MBEDTLS_CONFIG_FILE)\r
+#include "mbedtls/config.h"\r
+#else\r
+#include MBEDTLS_CONFIG_FILE\r
+#endif\r
+\r
+#if defined(MBEDTLS_PK_C)\r
+#include "mbedtls/pk_internal.h"\r
+\r
+/* Even if RSA not activated, for the sake of RSA-alt */\r
+#include "mbedtls/rsa.h"\r
+\r
+#include <string.h>\r
+\r
+#if defined(MBEDTLS_ECP_C)\r
+#include "mbedtls/ecp.h"\r
+#endif\r
+\r
+#if defined(MBEDTLS_ECDSA_C)\r
+#include "mbedtls/ecdsa.h"\r
+#endif\r
+\r
+#if defined(MBEDTLS_USE_PSA_CRYPTO)\r
+#include "mbedtls/asn1write.h"\r
+#endif\r
+\r
+#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)\r
+#include "mbedtls/platform_util.h"\r
+#endif\r
+\r
+#if defined(MBEDTLS_USE_PSA_CRYPTO)\r
+#include "psa/crypto.h"\r
+#include "mbedtls/psa_util.h"\r
+#include "mbedtls/asn1.h"\r
+#endif\r
+\r
+#if defined(MBEDTLS_PLATFORM_C)\r
+#include "mbedtls/platform.h"\r
+#else\r
+#include <stdlib.h>\r
+#define mbedtls_calloc calloc\r
+#define mbedtls_free free\r
+#endif\r
+\r
+#include <limits.h>\r
+#include <stdint.h>\r
+\r
+#if defined(MBEDTLS_RSA_C)\r
+static int rsa_can_do( mbedtls_pk_type_t type )\r
+{\r
+ return( type == MBEDTLS_PK_RSA ||\r
+ type == MBEDTLS_PK_RSASSA_PSS );\r
+}\r
+\r
+static size_t rsa_get_bitlen( const void *ctx )\r
+{\r
+ const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx;\r
+ return( 8 * mbedtls_rsa_get_len( rsa ) );\r
+}\r
+\r
+static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len )\r
+{\r
+ int ret;\r
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;\r
+ size_t rsa_len = mbedtls_rsa_get_len( rsa );\r
+\r
+#if SIZE_MAX > UINT_MAX\r
+ if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+#endif /* SIZE_MAX > UINT_MAX */\r
+\r
+ if( sig_len < rsa_len )\r
+ return( MBEDTLS_ERR_RSA_VERIFY_FAILED );\r
+\r
+ if( ( ret = mbedtls_rsa_pkcs1_verify( rsa, NULL, NULL,\r
+ MBEDTLS_RSA_PUBLIC, md_alg,\r
+ (unsigned int) hash_len, hash, sig ) ) != 0 )\r
+ return( ret );\r
+\r
+ /* The buffer contains a valid signature followed by extra data.\r
+ * We have a special error code for that so that so that callers can\r
+ * use mbedtls_pk_verify() to check "Does the buffer start with a\r
+ * valid signature?" and not just "Does the buffer contain a valid\r
+ * signature?". */\r
+ if( sig_len > rsa_len )\r
+ return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );\r
+\r
+ return( 0 );\r
+}\r
+\r
+static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;\r
+\r
+#if SIZE_MAX > UINT_MAX\r
+ if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+#endif /* SIZE_MAX > UINT_MAX */\r
+\r
+ *sig_len = mbedtls_rsa_get_len( rsa );\r
+\r
+ return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,\r
+ md_alg, (unsigned int) hash_len, hash, sig ) );\r
+}\r
+\r
+static int rsa_decrypt_wrap( void *ctx,\r
+ const unsigned char *input, size_t ilen,\r
+ unsigned char *output, size_t *olen, size_t osize,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;\r
+\r
+ if( ilen != mbedtls_rsa_get_len( rsa ) )\r
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );\r
+\r
+ return( mbedtls_rsa_pkcs1_decrypt( rsa, f_rng, p_rng,\r
+ MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );\r
+}\r
+\r
+static int rsa_encrypt_wrap( void *ctx,\r
+ const unsigned char *input, size_t ilen,\r
+ unsigned char *output, size_t *olen, size_t osize,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;\r
+ *olen = mbedtls_rsa_get_len( rsa );\r
+\r
+ if( *olen > osize )\r
+ return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );\r
+\r
+ return( mbedtls_rsa_pkcs1_encrypt( rsa, f_rng, p_rng, MBEDTLS_RSA_PUBLIC,\r
+ ilen, input, output ) );\r
+}\r
+\r
+static int rsa_check_pair_wrap( const void *pub, const void *prv )\r
+{\r
+ return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,\r
+ (const mbedtls_rsa_context *) prv ) );\r
+}\r
+\r
+static void *rsa_alloc_wrap( void )\r
+{\r
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );\r
+\r
+ if( ctx != NULL )\r
+ mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );\r
+\r
+ return( ctx );\r
+}\r
+\r
+static void rsa_free_wrap( void *ctx )\r
+{\r
+ mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );\r
+ mbedtls_free( ctx );\r
+}\r
+\r
+static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )\r
+{\r
+ items->type = MBEDTLS_PK_DEBUG_MPI;\r
+ items->name = "rsa.N";\r
+ items->value = &( ((mbedtls_rsa_context *) ctx)->N );\r
+\r
+ items++;\r
+\r
+ items->type = MBEDTLS_PK_DEBUG_MPI;\r
+ items->name = "rsa.E";\r
+ items->value = &( ((mbedtls_rsa_context *) ctx)->E );\r
+}\r
+\r
+const mbedtls_pk_info_t mbedtls_rsa_info = {\r
+ MBEDTLS_PK_RSA,\r
+ "RSA",\r
+ rsa_get_bitlen,\r
+ rsa_can_do,\r
+ rsa_verify_wrap,\r
+ rsa_sign_wrap,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL,\r
+ NULL,\r
+#endif\r
+ rsa_decrypt_wrap,\r
+ rsa_encrypt_wrap,\r
+ rsa_check_pair_wrap,\r
+ rsa_alloc_wrap,\r
+ rsa_free_wrap,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL,\r
+ NULL,\r
+#endif\r
+ rsa_debug,\r
+};\r
+#endif /* MBEDTLS_RSA_C */\r
+\r
+#if defined(MBEDTLS_ECP_C)\r
+/*\r
+ * Generic EC key\r
+ */\r
+static int eckey_can_do( mbedtls_pk_type_t type )\r
+{\r
+ return( type == MBEDTLS_PK_ECKEY ||\r
+ type == MBEDTLS_PK_ECKEY_DH ||\r
+ type == MBEDTLS_PK_ECDSA );\r
+}\r
+\r
+static size_t eckey_get_bitlen( const void *ctx )\r
+{\r
+ return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );\r
+}\r
+\r
+#if defined(MBEDTLS_ECDSA_C)\r
+/* Forward declarations */\r
+static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len );\r
+\r
+static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );\r
+\r
+static int eckey_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len )\r
+{\r
+ int ret;\r
+ mbedtls_ecdsa_context ecdsa;\r
+\r
+ mbedtls_ecdsa_init( &ecdsa );\r
+\r
+ if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )\r
+ ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );\r
+\r
+ mbedtls_ecdsa_free( &ecdsa );\r
+\r
+ return( ret );\r
+}\r
+\r
+static int eckey_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ int ret;\r
+ mbedtls_ecdsa_context ecdsa;\r
+\r
+ mbedtls_ecdsa_init( &ecdsa );\r
+\r
+ if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )\r
+ ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,\r
+ f_rng, p_rng );\r
+\r
+ mbedtls_ecdsa_free( &ecdsa );\r
+\r
+ return( ret );\r
+}\r
+\r
+#if defined(MBEDTLS_ECP_RESTARTABLE)\r
+/* Forward declarations */\r
+static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len,\r
+ void *rs_ctx );\r
+\r
+static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,\r
+ void *rs_ctx );\r
+\r
+/*\r
+ * Restart context for ECDSA operations with ECKEY context\r
+ *\r
+ * We need to store an actual ECDSA context, as we need to pass the same to\r
+ * the underlying ecdsa function, so we can't create it on the fly every time.\r
+ */\r
+typedef struct\r
+{\r
+ mbedtls_ecdsa_restart_ctx ecdsa_rs;\r
+ mbedtls_ecdsa_context ecdsa_ctx;\r
+} eckey_restart_ctx;\r
+\r
+static void *eckey_rs_alloc( void )\r
+{\r
+ eckey_restart_ctx *rs_ctx;\r
+\r
+ void *ctx = mbedtls_calloc( 1, sizeof( eckey_restart_ctx ) );\r
+\r
+ if( ctx != NULL )\r
+ {\r
+ rs_ctx = ctx;\r
+ mbedtls_ecdsa_restart_init( &rs_ctx->ecdsa_rs );\r
+ mbedtls_ecdsa_init( &rs_ctx->ecdsa_ctx );\r
+ }\r
+\r
+ return( ctx );\r
+}\r
+\r
+static void eckey_rs_free( void *ctx )\r
+{\r
+ eckey_restart_ctx *rs_ctx;\r
+\r
+ if( ctx == NULL)\r
+ return;\r
+\r
+ rs_ctx = ctx;\r
+ mbedtls_ecdsa_restart_free( &rs_ctx->ecdsa_rs );\r
+ mbedtls_ecdsa_free( &rs_ctx->ecdsa_ctx );\r
+\r
+ mbedtls_free( ctx );\r
+}\r
+\r
+static int eckey_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len,\r
+ void *rs_ctx )\r
+{\r
+ int ret;\r
+ eckey_restart_ctx *rs = rs_ctx;\r
+\r
+ /* Should never happen */\r
+ if( rs == NULL )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+\r
+ /* set up our own sub-context if needed (that is, on first run) */\r
+ if( rs->ecdsa_ctx.grp.pbits == 0 )\r
+ MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );\r
+\r
+ MBEDTLS_MPI_CHK( ecdsa_verify_rs_wrap( &rs->ecdsa_ctx,\r
+ md_alg, hash, hash_len,\r
+ sig, sig_len, &rs->ecdsa_rs ) );\r
+\r
+cleanup:\r
+ return( ret );\r
+}\r
+\r
+static int eckey_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,\r
+ void *rs_ctx )\r
+{\r
+ int ret;\r
+ eckey_restart_ctx *rs = rs_ctx;\r
+\r
+ /* Should never happen */\r
+ if( rs == NULL )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+\r
+ /* set up our own sub-context if needed (that is, on first run) */\r
+ if( rs->ecdsa_ctx.grp.pbits == 0 )\r
+ MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );\r
+\r
+ MBEDTLS_MPI_CHK( ecdsa_sign_rs_wrap( &rs->ecdsa_ctx, md_alg,\r
+ hash, hash_len, sig, sig_len,\r
+ f_rng, p_rng, &rs->ecdsa_rs ) );\r
+\r
+cleanup:\r
+ return( ret );\r
+}\r
+#endif /* MBEDTLS_ECP_RESTARTABLE */\r
+#endif /* MBEDTLS_ECDSA_C */\r
+\r
+static int eckey_check_pair( const void *pub, const void *prv )\r
+{\r
+ return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,\r
+ (const mbedtls_ecp_keypair *) prv ) );\r
+}\r
+\r
+static void *eckey_alloc_wrap( void )\r
+{\r
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );\r
+\r
+ if( ctx != NULL )\r
+ mbedtls_ecp_keypair_init( ctx );\r
+\r
+ return( ctx );\r
+}\r
+\r
+static void eckey_free_wrap( void *ctx )\r
+{\r
+ mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );\r
+ mbedtls_free( ctx );\r
+}\r
+\r
+static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )\r
+{\r
+ items->type = MBEDTLS_PK_DEBUG_ECP;\r
+ items->name = "eckey.Q";\r
+ items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );\r
+}\r
+\r
+const mbedtls_pk_info_t mbedtls_eckey_info = {\r
+ MBEDTLS_PK_ECKEY,\r
+ "EC",\r
+ eckey_get_bitlen,\r
+ eckey_can_do,\r
+#if defined(MBEDTLS_ECDSA_C)\r
+ eckey_verify_wrap,\r
+ eckey_sign_wrap,\r
+#if defined(MBEDTLS_ECP_RESTARTABLE)\r
+ eckey_verify_rs_wrap,\r
+ eckey_sign_rs_wrap,\r
+#endif\r
+#else /* MBEDTLS_ECDSA_C */\r
+ NULL,\r
+ NULL,\r
+#endif /* MBEDTLS_ECDSA_C */\r
+ NULL,\r
+ NULL,\r
+ eckey_check_pair,\r
+ eckey_alloc_wrap,\r
+ eckey_free_wrap,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ eckey_rs_alloc,\r
+ eckey_rs_free,\r
+#endif\r
+ eckey_debug,\r
+};\r
+\r
+/*\r
+ * EC key restricted to ECDH\r
+ */\r
+static int eckeydh_can_do( mbedtls_pk_type_t type )\r
+{\r
+ return( type == MBEDTLS_PK_ECKEY ||\r
+ type == MBEDTLS_PK_ECKEY_DH );\r
+}\r
+\r
+const mbedtls_pk_info_t mbedtls_eckeydh_info = {\r
+ MBEDTLS_PK_ECKEY_DH,\r
+ "EC_DH",\r
+ eckey_get_bitlen, /* Same underlying key structure */\r
+ eckeydh_can_do,\r
+ NULL,\r
+ NULL,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL,\r
+ NULL,\r
+#endif\r
+ NULL,\r
+ NULL,\r
+ eckey_check_pair,\r
+ eckey_alloc_wrap, /* Same underlying key structure */\r
+ eckey_free_wrap, /* Same underlying key structure */\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL,\r
+ NULL,\r
+#endif\r
+ eckey_debug, /* Same underlying key structure */\r
+};\r
+#endif /* MBEDTLS_ECP_C */\r
+\r
+#if defined(MBEDTLS_ECDSA_C)\r
+static int ecdsa_can_do( mbedtls_pk_type_t type )\r
+{\r
+ return( type == MBEDTLS_PK_ECDSA );\r
+}\r
+\r
+#if defined(MBEDTLS_USE_PSA_CRYPTO)\r
+/*\r
+ * An ASN.1 encoded signature is a sequence of two ASN.1 integers. Parse one of\r
+ * those integers and convert it to the fixed-length encoding expected by PSA.\r
+ */\r
+static int extract_ecdsa_sig_int( unsigned char **from, const unsigned char *end,\r
+ unsigned char *to, size_t to_len )\r
+{\r
+ int ret;\r
+ size_t unpadded_len, padding_len;\r
+\r
+ if( ( ret = mbedtls_asn1_get_tag( from, end, &unpadded_len,\r
+ MBEDTLS_ASN1_INTEGER ) ) != 0 )\r
+ {\r
+ return( ret );\r
+ }\r
+\r
+ while( unpadded_len > 0 && **from == 0x00 )\r
+ {\r
+ ( *from )++;\r
+ unpadded_len--;\r
+ }\r
+\r
+ if( unpadded_len > to_len || unpadded_len == 0 )\r
+ return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );\r
+\r
+ padding_len = to_len - unpadded_len;\r
+ memset( to, 0x00, padding_len );\r
+ memcpy( to + padding_len, *from, unpadded_len );\r
+ ( *from ) += unpadded_len;\r
+\r
+ return( 0 );\r
+}\r
+\r
+/*\r
+ * Convert a signature from an ASN.1 sequence of two integers\r
+ * to a raw {r,s} buffer. Note: the provided sig buffer must be at least\r
+ * twice as big as int_size.\r
+ */\r
+static int extract_ecdsa_sig( unsigned char **p, const unsigned char *end,\r
+ unsigned char *sig, size_t int_size )\r
+{\r
+ int ret;\r
+ size_t tmp_size;\r
+\r
+ if( ( ret = mbedtls_asn1_get_tag( p, end, &tmp_size,\r
+ MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )\r
+ return( ret );\r
+\r
+ /* Extract r */\r
+ if( ( ret = extract_ecdsa_sig_int( p, end, sig, int_size ) ) != 0 )\r
+ return( ret );\r
+ /* Extract s */\r
+ if( ( ret = extract_ecdsa_sig_int( p, end, sig + int_size, int_size ) ) != 0 )\r
+ return( ret );\r
+\r
+ return( 0 );\r
+}\r
+\r
+static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len )\r
+{\r
+ int ret;\r
+ psa_key_handle_t key_slot;\r
+ psa_key_policy_t policy;\r
+ psa_key_type_t psa_type;\r
+ mbedtls_pk_context key;\r
+ int key_len;\r
+ /* see ECP_PUB_DER_MAX_BYTES in pkwrite.c */\r
+ unsigned char buf[30 + 2 * MBEDTLS_ECP_MAX_BYTES];\r
+ unsigned char *p;\r
+ mbedtls_pk_info_t pk_info = mbedtls_eckey_info;\r
+ psa_algorithm_t psa_sig_md, psa_md;\r
+ psa_ecc_curve_t curve = mbedtls_psa_translate_ecc_group(\r
+ ( (mbedtls_ecdsa_context *) ctx )->grp.id );\r
+ const size_t signature_part_size = ( ( (mbedtls_ecdsa_context *) ctx )->grp.nbits + 7 ) / 8;\r
+\r
+ if( curve == 0 )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+\r
+ /* mbedtls_pk_write_pubkey() expects a full PK context;\r
+ * re-construct one to make it happy */\r
+ key.pk_info = &pk_info;\r
+ key.pk_ctx = ctx;\r
+ p = buf + sizeof( buf );\r
+ key_len = mbedtls_pk_write_pubkey( &p, buf, &key );\r
+ if( key_len <= 0 )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+\r
+ psa_md = mbedtls_psa_translate_md( md_alg );\r
+ if( psa_md == 0 )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+ psa_sig_md = PSA_ALG_ECDSA( psa_md );\r
+ psa_type = PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve );\r
+\r
+ if( ( ret = psa_allocate_key( &key_slot ) ) != PSA_SUCCESS )\r
+ return( mbedtls_psa_err_translate_pk( ret ) );\r
+\r
+ policy = psa_key_policy_init();\r
+ psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, psa_sig_md );\r
+ if( ( ret = psa_set_key_policy( key_slot, &policy ) ) != PSA_SUCCESS )\r
+ {\r
+ ret = mbedtls_psa_err_translate_pk( ret );\r
+ goto cleanup;\r
+ }\r
+\r
+ if( psa_import_key( key_slot, psa_type, buf + sizeof( buf ) - key_len, key_len )\r
+ != PSA_SUCCESS )\r
+ {\r
+ ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;\r
+ goto cleanup;\r
+ }\r
+\r
+ /* We don't need the exported key anymore and can\r
+ * reuse its buffer for signature extraction. */\r
+ if( 2 * signature_part_size > sizeof( buf ) )\r
+ {\r
+ ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;\r
+ goto cleanup;\r
+ }\r
+\r
+ p = (unsigned char*) sig;\r
+ if( ( ret = extract_ecdsa_sig( &p, sig + sig_len, buf,\r
+ signature_part_size ) ) != 0 )\r
+ {\r
+ goto cleanup;\r
+ }\r
+\r
+ if( psa_asymmetric_verify( key_slot, psa_sig_md,\r
+ hash, hash_len,\r
+ buf, 2 * signature_part_size )\r
+ != PSA_SUCCESS )\r
+ {\r
+ ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;\r
+ goto cleanup;\r
+ }\r
+\r
+ if( p != sig + sig_len )\r
+ {\r
+ ret = MBEDTLS_ERR_PK_SIG_LEN_MISMATCH;\r
+ goto cleanup;\r
+ }\r
+ ret = 0;\r
+\r
+cleanup:\r
+ psa_destroy_key( key_slot );\r
+ return( ret );\r
+}\r
+#else /* MBEDTLS_USE_PSA_CRYPTO */\r
+static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len )\r
+{\r
+ int ret;\r
+ ((void) md_alg);\r
+\r
+ ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,\r
+ hash, hash_len, sig, sig_len );\r
+\r
+ if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )\r
+ return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );\r
+\r
+ return( ret );\r
+}\r
+#endif /* MBEDTLS_USE_PSA_CRYPTO */\r
+\r
+static int ecdsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,\r
+ md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );\r
+}\r
+\r
+#if defined(MBEDTLS_ECP_RESTARTABLE)\r
+static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ const unsigned char *sig, size_t sig_len,\r
+ void *rs_ctx )\r
+{\r
+ int ret;\r
+ ((void) md_alg);\r
+\r
+ ret = mbedtls_ecdsa_read_signature_restartable(\r
+ (mbedtls_ecdsa_context *) ctx,\r
+ hash, hash_len, sig, sig_len,\r
+ (mbedtls_ecdsa_restart_ctx *) rs_ctx );\r
+\r
+ if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )\r
+ return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );\r
+\r
+ return( ret );\r
+}\r
+\r
+static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,\r
+ void *rs_ctx )\r
+{\r
+ return( mbedtls_ecdsa_write_signature_restartable(\r
+ (mbedtls_ecdsa_context *) ctx,\r
+ md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng,\r
+ (mbedtls_ecdsa_restart_ctx *) rs_ctx ) );\r
+\r
+}\r
+#endif /* MBEDTLS_ECP_RESTARTABLE */\r
+\r
+static void *ecdsa_alloc_wrap( void )\r
+{\r
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );\r
+\r
+ if( ctx != NULL )\r
+ mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );\r
+\r
+ return( ctx );\r
+}\r
+\r
+static void ecdsa_free_wrap( void *ctx )\r
+{\r
+ mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );\r
+ mbedtls_free( ctx );\r
+}\r
+\r
+#if defined(MBEDTLS_ECP_RESTARTABLE)\r
+static void *ecdsa_rs_alloc( void )\r
+{\r
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_restart_ctx ) );\r
+\r
+ if( ctx != NULL )\r
+ mbedtls_ecdsa_restart_init( ctx );\r
+\r
+ return( ctx );\r
+}\r
+\r
+static void ecdsa_rs_free( void *ctx )\r
+{\r
+ mbedtls_ecdsa_restart_free( ctx );\r
+ mbedtls_free( ctx );\r
+}\r
+#endif /* MBEDTLS_ECP_RESTARTABLE */\r
+\r
+const mbedtls_pk_info_t mbedtls_ecdsa_info = {\r
+ MBEDTLS_PK_ECDSA,\r
+ "ECDSA",\r
+ eckey_get_bitlen, /* Compatible key structures */\r
+ ecdsa_can_do,\r
+ ecdsa_verify_wrap,\r
+ ecdsa_sign_wrap,\r
+#if defined(MBEDTLS_ECP_RESTARTABLE)\r
+ ecdsa_verify_rs_wrap,\r
+ ecdsa_sign_rs_wrap,\r
+#endif\r
+ NULL,\r
+ NULL,\r
+ eckey_check_pair, /* Compatible key structures */\r
+ ecdsa_alloc_wrap,\r
+ ecdsa_free_wrap,\r
+#if defined(MBEDTLS_ECP_RESTARTABLE)\r
+ ecdsa_rs_alloc,\r
+ ecdsa_rs_free,\r
+#endif\r
+ eckey_debug, /* Compatible key structures */\r
+};\r
+#endif /* MBEDTLS_ECDSA_C */\r
+\r
+#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)\r
+/*\r
+ * Support for alternative RSA-private implementations\r
+ */\r
+\r
+static int rsa_alt_can_do( mbedtls_pk_type_t type )\r
+{\r
+ return( type == MBEDTLS_PK_RSA );\r
+}\r
+\r
+static size_t rsa_alt_get_bitlen( const void *ctx )\r
+{\r
+ const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx;\r
+\r
+ return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );\r
+}\r
+\r
+static int rsa_alt_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;\r
+\r
+#if SIZE_MAX > UINT_MAX\r
+ if( UINT_MAX < hash_len )\r
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );\r
+#endif /* SIZE_MAX > UINT_MAX */\r
+\r
+ *sig_len = rsa_alt->key_len_func( rsa_alt->key );\r
+\r
+ return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,\r
+ md_alg, (unsigned int) hash_len, hash, sig ) );\r
+}\r
+\r
+static int rsa_alt_decrypt_wrap( void *ctx,\r
+ const unsigned char *input, size_t ilen,\r
+ unsigned char *output, size_t *olen, size_t osize,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;\r
+\r
+ ((void) f_rng);\r
+ ((void) p_rng);\r
+\r
+ if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )\r
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );\r
+\r
+ return( rsa_alt->decrypt_func( rsa_alt->key,\r
+ MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );\r
+}\r
+\r
+#if defined(MBEDTLS_RSA_C)\r
+static int rsa_alt_check_pair( const void *pub, const void *prv )\r
+{\r
+ unsigned char sig[MBEDTLS_MPI_MAX_SIZE];\r
+ unsigned char hash[32];\r
+ size_t sig_len = 0;\r
+ int ret;\r
+\r
+ if( rsa_alt_get_bitlen( prv ) != rsa_get_bitlen( pub ) )\r
+ return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );\r
+\r
+ memset( hash, 0x2a, sizeof( hash ) );\r
+\r
+ if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,\r
+ hash, sizeof( hash ),\r
+ sig, &sig_len, NULL, NULL ) ) != 0 )\r
+ {\r
+ return( ret );\r
+ }\r
+\r
+ if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,\r
+ hash, sizeof( hash ), sig, sig_len ) != 0 )\r
+ {\r
+ return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );\r
+ }\r
+\r
+ return( 0 );\r
+}\r
+#endif /* MBEDTLS_RSA_C */\r
+\r
+static void *rsa_alt_alloc_wrap( void )\r
+{\r
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );\r
+\r
+ if( ctx != NULL )\r
+ memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );\r
+\r
+ return( ctx );\r
+}\r
+\r
+static void rsa_alt_free_wrap( void *ctx )\r
+{\r
+ mbedtls_platform_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );\r
+ mbedtls_free( ctx );\r
+}\r
+\r
+const mbedtls_pk_info_t mbedtls_rsa_alt_info = {\r
+ MBEDTLS_PK_RSA_ALT,\r
+ "RSA-alt",\r
+ rsa_alt_get_bitlen,\r
+ rsa_alt_can_do,\r
+ NULL,\r
+ rsa_alt_sign_wrap,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL,\r
+ NULL,\r
+#endif\r
+ rsa_alt_decrypt_wrap,\r
+ NULL,\r
+#if defined(MBEDTLS_RSA_C)\r
+ rsa_alt_check_pair,\r
+#else\r
+ NULL,\r
+#endif\r
+ rsa_alt_alloc_wrap,\r
+ rsa_alt_free_wrap,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL,\r
+ NULL,\r
+#endif\r
+ NULL,\r
+};\r
+\r
+#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */\r
+\r
+#if defined(MBEDTLS_USE_PSA_CRYPTO)\r
+\r
+static void *pk_opaque_alloc_wrap( void )\r
+{\r
+ void *ctx = mbedtls_calloc( 1, sizeof( psa_key_handle_t ) );\r
+\r
+ /* no _init() function to call, an calloc() already zeroized */\r
+\r
+ return( ctx );\r
+}\r
+\r
+static void pk_opaque_free_wrap( void *ctx )\r
+{\r
+ mbedtls_platform_zeroize( ctx, sizeof( psa_key_handle_t ) );\r
+ mbedtls_free( ctx );\r
+}\r
+\r
+static size_t pk_opaque_get_bitlen( const void *ctx )\r
+{\r
+ const psa_key_handle_t *key = (const psa_key_handle_t *) ctx;\r
+ size_t bits;\r
+\r
+ if( PSA_SUCCESS != psa_get_key_information( *key, NULL, &bits ) )\r
+ return( 0 );\r
+\r
+ return( bits );\r
+}\r
+\r
+static int pk_opaque_can_do( mbedtls_pk_type_t type )\r
+{\r
+ /* For now opaque PSA keys can only wrap ECC keypairs,\r
+ * as checked by setup_psa().\r
+ * Also, ECKEY_DH does not really make sense with the current API. */\r
+ return( type == MBEDTLS_PK_ECKEY ||\r
+ type == MBEDTLS_PK_ECDSA );\r
+}\r
+\r
+/*\r
+ * Simultaneously convert and move raw MPI from the beginning of a buffer\r
+ * to an ASN.1 MPI at the end of the buffer.\r
+ * See also mbedtls_asn1_write_mpi().\r
+ *\r
+ * p: pointer to the end of the output buffer\r
+ * start: start of the output buffer, and also of the mpi to write at the end\r
+ * n_len: length of the mpi to read from start\r
+ */\r
+static int asn1_write_mpibuf( unsigned char **p, unsigned char *start,\r
+ size_t n_len )\r
+{\r
+ int ret;\r
+ size_t len = 0;\r
+\r
+ if( (size_t)( *p - start ) < n_len )\r
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );\r
+\r
+ len = n_len;\r
+ *p -= len;\r
+ memmove( *p, start, len );\r
+\r
+ /* ASN.1 DER encoding requires minimal length, so skip leading 0s.\r
+ * Neither r nor s should be 0, but as a failsafe measure, still detect\r
+ * that rather than overflowing the buffer in case of a PSA error. */\r
+ while( len > 0 && **p == 0x00 )\r
+ {\r
+ ++(*p);\r
+ --len;\r
+ }\r
+\r
+ /* this is only reached if the signature was invalid */\r
+ if( len == 0 )\r
+ return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED );\r
+\r
+ /* if the msb is 1, ASN.1 requires that we prepend a 0.\r
+ * Neither r nor s can be 0, so we can assume len > 0 at all times. */\r
+ if( **p & 0x80 )\r
+ {\r
+ if( *p - start < 1 )\r
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );\r
+\r
+ *--(*p) = 0x00;\r
+ len += 1;\r
+ }\r
+\r
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );\r
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,\r
+ MBEDTLS_ASN1_INTEGER ) );\r
+\r
+ return( (int) len );\r
+}\r
+\r
+/* Transcode signature from PSA format to ASN.1 sequence.\r
+ * See ecdsa_signature_to_asn1 in ecdsa.c, but with byte buffers instead of\r
+ * MPIs, and in-place.\r
+ *\r
+ * [in/out] sig: the signature pre- and post-transcoding\r
+ * [in/out] sig_len: signature length pre- and post-transcoding\r
+ * [int] buf_len: the available size the in/out buffer\r
+ */\r
+static int pk_ecdsa_sig_asn1_from_psa( unsigned char *sig, size_t *sig_len,\r
+ size_t buf_len )\r
+{\r
+ int ret;\r
+ size_t len = 0;\r
+ const size_t rs_len = *sig_len / 2;\r
+ unsigned char *p = sig + buf_len;\r
+\r
+ MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig + rs_len, rs_len ) );\r
+ MBEDTLS_ASN1_CHK_ADD( len, asn1_write_mpibuf( &p, sig, rs_len ) );\r
+\r
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, sig, len ) );\r
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, sig,\r
+ MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );\r
+\r
+ memmove( sig, p, len );\r
+ *sig_len = len;\r
+\r
+ return( 0 );\r
+}\r
+\r
+static int pk_opaque_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,\r
+ const unsigned char *hash, size_t hash_len,\r
+ unsigned char *sig, size_t *sig_len,\r
+ int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )\r
+{\r
+ const psa_key_handle_t *key = (const psa_key_handle_t *) ctx;\r
+ psa_algorithm_t alg = PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) );\r
+ size_t bits, buf_len;\r
+ psa_status_t status;\r
+\r
+ /* PSA has its own RNG */\r
+ (void) f_rng;\r
+ (void) p_rng;\r
+\r
+ /* PSA needs an output buffer of known size, but our API doesn't provide\r
+ * that information. Assume that the buffer is large enough for a\r
+ * maximal-length signature with that key (otherwise the application is\r
+ * buggy anyway). */\r
+ status = psa_get_key_information( *key, NULL, &bits );\r
+ if( status != PSA_SUCCESS )\r
+ return( mbedtls_psa_err_translate_pk( status ) );\r
+\r
+ buf_len = MBEDTLS_ECDSA_MAX_SIG_LEN( bits );\r
+\r
+ /* make the signature */\r
+ status = psa_asymmetric_sign( *key, alg, hash, hash_len,\r
+ sig, buf_len, sig_len );\r
+ if( status != PSA_SUCCESS )\r
+ return( mbedtls_psa_err_translate_pk( status ) );\r
+\r
+ /* transcode it to ASN.1 sequence */\r
+ return( pk_ecdsa_sig_asn1_from_psa( sig, sig_len, buf_len ) );\r
+}\r
+\r
+const mbedtls_pk_info_t mbedtls_pk_opaque_info = {\r
+ MBEDTLS_PK_OPAQUE,\r
+ "Opaque",\r
+ pk_opaque_get_bitlen,\r
+ pk_opaque_can_do,\r
+ NULL, /* verify - will be done later */\r
+ pk_opaque_sign_wrap,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL, /* restartable verify - not relevant */\r
+ NULL, /* restartable sign - not relevant */\r
+#endif\r
+ NULL, /* decrypt - will be done later */\r
+ NULL, /* encrypt - will be done later */\r
+ NULL, /* check_pair - could be done later or left NULL */\r
+ pk_opaque_alloc_wrap,\r
+ pk_opaque_free_wrap,\r
+#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)\r
+ NULL, /* restart alloc - not relevant */\r
+ NULL, /* restart free - not relevant */\r
+#endif\r
+ NULL, /* debug - could be done later, or even left NULL */\r
+};\r
+\r
+#endif /* MBEDTLS_USE_PSA_CRYPTO */\r
+\r
+#endif /* MBEDTLS_PK_C */\r
projects / freertos / blobdiff