/* * Public Key abstraction layer * * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "common.h" #if defined(MBEDTLS_PK_C) #include "mbedtls/pk.h" #include "pk_wrap.h" #include "pkwrite.h" #include "hash_info.h" #include "mbedtls/platform_util.h" #include "mbedtls/error.h" #if defined(MBEDTLS_RSA_C) #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_PSA_CRYPTO_C) #include "mbedtls/psa_util.h" #endif #include #include /* * Initialise a mbedtls_pk_context */ void mbedtls_pk_init(mbedtls_pk_context *ctx) { ctx->pk_info = NULL; ctx->pk_ctx = NULL; } /* * Free (the components of) a mbedtls_pk_context */ void mbedtls_pk_free(mbedtls_pk_context *ctx) { if (ctx == NULL) { return; } if (ctx->pk_info != NULL) { ctx->pk_info->ctx_free_func(ctx->pk_ctx); } 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) { 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 || ctx->pk_info == NULL || ctx->pk_info->rs_free_func == NULL) { return; } ctx->pk_info->rs_free_func(ctx->rs_ctx); ctx->pk_info = NULL; ctx->rs_ctx = NULL; } #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ /* * Get pk_info structure from type */ const mbedtls_pk_info_t *mbedtls_pk_info_from_type(mbedtls_pk_type_t pk_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: return &mbedtls_eckey_info; case MBEDTLS_PK_ECKEY_DH: return &mbedtls_eckeydh_info; #endif #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) case MBEDTLS_PK_ECDSA: return &mbedtls_ecdsa_info; #endif /* MBEDTLS_PK_RSA_ALT omitted on purpose */ default: return NULL; } } /* * Initialise context */ int mbedtls_pk_setup(mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info) { if (info == NULL || ctx->pk_info != NULL) { 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; return 0; } #if defined(MBEDTLS_USE_PSA_CRYPTO) /* * Initialise a PSA-wrapping context */ int mbedtls_pk_setup_opaque(mbedtls_pk_context *ctx, const mbedtls_svc_key_id_t key) { const mbedtls_pk_info_t *info = NULL; psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; mbedtls_svc_key_id_t *pk_ctx; psa_key_type_t type; if (ctx == NULL || ctx->pk_info != NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (PSA_SUCCESS != psa_get_key_attributes(key, &attributes)) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } type = psa_get_key_type(&attributes); psa_reset_key_attributes(&attributes); if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(type)) { info = &mbedtls_pk_ecdsa_opaque_info; } else if (type == PSA_KEY_TYPE_RSA_KEY_PAIR) { info = &mbedtls_pk_rsa_opaque_info; } else { return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE; } if ((ctx->pk_ctx = info->ctx_alloc_func()) == NULL) { return MBEDTLS_ERR_PK_ALLOC_FAILED; } ctx->pk_info = info; pk_ctx = (mbedtls_svc_key_id_t *) ctx->pk_ctx; *pk_ctx = key; return 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #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; const mbedtls_pk_info_t *info = &mbedtls_rsa_alt_info; if (ctx->pk_info != NULL) { 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 || ctx->pk_info == NULL) { return 0; } return ctx->pk_info->can_do(type); } #if defined(MBEDTLS_USE_PSA_CRYPTO) /* * Tell if a PK can do the operations of the given PSA algorithm */ int mbedtls_pk_can_do_ext(const mbedtls_pk_context *ctx, psa_algorithm_t alg, psa_key_usage_t usage) { psa_key_usage_t key_usage; /* 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 || ctx->pk_info == NULL) { return 0; } /* Filter out non allowed algorithms */ if (PSA_ALG_IS_ECDSA(alg) == 0 && PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) == 0 && PSA_ALG_IS_RSA_PSS(alg) == 0 && alg != PSA_ALG_RSA_PKCS1V15_CRYPT && PSA_ALG_IS_ECDH(alg) == 0) { return 0; } /* Filter out non allowed usage flags */ if (usage == 0 || (usage & ~(PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_DECRYPT | PSA_KEY_USAGE_DERIVE)) != 0) { return 0; } /* Wildcard hash is not allowed */ if (PSA_ALG_IS_SIGN_HASH(alg) && PSA_ALG_SIGN_GET_HASH(alg) == PSA_ALG_ANY_HASH) { return 0; } if (mbedtls_pk_get_type(ctx) != MBEDTLS_PK_OPAQUE) { mbedtls_pk_type_t type; if (PSA_ALG_IS_ECDSA(alg) || PSA_ALG_IS_ECDH(alg)) { type = MBEDTLS_PK_ECKEY; } else if (PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) || alg == PSA_ALG_RSA_PKCS1V15_CRYPT) { type = MBEDTLS_PK_RSA; } else if (PSA_ALG_IS_RSA_PSS(alg)) { type = MBEDTLS_PK_RSASSA_PSS; } else { return 0; } if (ctx->pk_info->can_do(type) == 0) { return 0; } switch (type) { case MBEDTLS_PK_ECKEY: key_usage = PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_DERIVE; break; case MBEDTLS_PK_RSA: case MBEDTLS_PK_RSASSA_PSS: key_usage = PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_SIGN_MESSAGE | PSA_KEY_USAGE_DECRYPT; break; default: /* Should never happen */ return 0; } return (key_usage & usage) == usage; } const mbedtls_svc_key_id_t *key = (const mbedtls_svc_key_id_t *) ctx->pk_ctx; psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; psa_algorithm_t key_alg, key_alg2; psa_status_t status; status = psa_get_key_attributes(*key, &attributes); if (status != PSA_SUCCESS) { return 0; } key_alg = psa_get_key_algorithm(&attributes); key_alg2 = psa_get_key_enrollment_algorithm(&attributes); key_usage = psa_get_key_usage_flags(&attributes); psa_reset_key_attributes(&attributes); if ((key_usage & usage) != usage) { return 0; } /* * Common case: the key alg or alg2 only allows alg. * This will match PSA_ALG_RSA_PKCS1V15_CRYPT & PSA_ALG_IS_ECDH * directly. * This would also match ECDSA/RSA_PKCS1V15_SIGN/RSA_PSS with * a fixed hash on key_alg/key_alg2. */ if (alg == key_alg || alg == key_alg2) { return 1; } /* * If key_alg or key_alg2 is a hash-and-sign with a wildcard for the hash, * and alg is the same hash-and-sign family with any hash, * then alg is compliant with this key alg */ if (PSA_ALG_IS_SIGN_HASH(alg)) { if (PSA_ALG_IS_SIGN_HASH(key_alg) && PSA_ALG_SIGN_GET_HASH(key_alg) == PSA_ALG_ANY_HASH && (alg & ~PSA_ALG_HASH_MASK) == (key_alg & ~PSA_ALG_HASH_MASK)) { return 1; } if (PSA_ALG_IS_SIGN_HASH(key_alg2) && PSA_ALG_SIGN_GET_HASH(key_alg2) == PSA_ALG_ANY_HASH && (alg & ~PSA_ALG_HASH_MASK) == (key_alg2 & ~PSA_ALG_HASH_MASK)) { return 1; } } return 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ /* * 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) { if (*hash_len != 0) { return 0; } *hash_len = mbedtls_hash_info_get_size(md_alg); if (*hash_len == 0) { return -1; } 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, const mbedtls_pk_info_t *info) { /* Don't do anything if already set up or invalid */ if (ctx == NULL || ctx->pk_info != NULL) { 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) { if ((md_alg != MBEDTLS_MD_NONE || hash_len != 0) && hash == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (ctx->pk_info == NULL || 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 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 */ if (ctx->pk_info->verify_func == NULL) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } return ctx->pk_info->verify_func(ctx->pk_ctx, md_alg, hash, hash_len, sig, sig_len); } /* * 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) { if ((md_alg != MBEDTLS_MD_NONE || hash_len != 0) && hash == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (ctx->pk_info == NULL) { 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) { /* 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); } #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21) int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; const mbedtls_pk_rsassa_pss_options *pss_opts; if (md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (options == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } pss_opts = (const mbedtls_pk_rsassa_pss_options *) options; #if defined(MBEDTLS_USE_PSA_CRYPTO) if (pss_opts->mgf1_hash_id == md_alg) { unsigned char buf[MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES]; unsigned char *p; int key_len; size_t signature_length; psa_status_t status = PSA_ERROR_DATA_CORRUPT; psa_status_t destruction_status = PSA_ERROR_DATA_CORRUPT; psa_algorithm_t psa_md_alg = mbedtls_hash_info_psa_from_md(md_alg); mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT; psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; psa_algorithm_t psa_sig_alg = PSA_ALG_RSA_PSS_ANY_SALT(psa_md_alg); p = buf + sizeof(buf); key_len = mbedtls_pk_write_pubkey(&p, buf, ctx); if (key_len < 0) { return key_len; } psa_set_key_type(&attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY); psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_VERIFY_HASH); psa_set_key_algorithm(&attributes, psa_sig_alg); status = psa_import_key(&attributes, buf + sizeof(buf) - key_len, key_len, &key_id); if (status != PSA_SUCCESS) { psa_destroy_key(key_id); return mbedtls_pk_error_from_psa(status); } /* This function requires returning MBEDTLS_ERR_PK_SIG_LEN_MISMATCH * on a valid signature with trailing data in a buffer, but * mbedtls_psa_rsa_verify_hash requires the sig_len to be exact, * so for this reason the passed sig_len is overwritten. Smaller * signature lengths should not be accepted for verification. */ signature_length = sig_len > mbedtls_pk_get_len(ctx) ? mbedtls_pk_get_len(ctx) : sig_len; status = psa_verify_hash(key_id, psa_sig_alg, hash, hash_len, sig, signature_length); destruction_status = psa_destroy_key(key_id); if (status == PSA_SUCCESS && sig_len > mbedtls_pk_get_len(ctx)) { return MBEDTLS_ERR_PK_SIG_LEN_MISMATCH; } if (status == PSA_SUCCESS) { status = destruction_status; } return mbedtls_pk_error_from_psa_rsa(status); } else #endif { 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), 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 */ } /* * 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_size, size_t *sig_len, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng, mbedtls_pk_restart_ctx *rs_ctx) { if ((md_alg != MBEDTLS_MD_NONE || hash_len != 0) && hash == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (ctx->pk_info == NULL || 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 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_size, 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 */ if (ctx->pk_info->sign_func == NULL) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } return ctx->pk_info->sign_func(ctx->pk_ctx, md_alg, hash, hash_len, sig, sig_size, 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_size, 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_size, sig_len, f_rng, p_rng, NULL); } #if defined(MBEDTLS_PSA_CRYPTO_C) /* * Make a signature given a signature type. */ int mbedtls_pk_sign_ext(mbedtls_pk_type_t pk_type, mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, unsigned char *sig, size_t sig_size, size_t *sig_len, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) { #if defined(MBEDTLS_RSA_C) psa_algorithm_t psa_md_alg; #endif /* MBEDTLS_RSA_C */ *sig_len = 0; if (ctx->pk_info == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (!mbedtls_pk_can_do(ctx, pk_type)) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } if (pk_type != MBEDTLS_PK_RSASSA_PSS) { return mbedtls_pk_sign(ctx, md_alg, hash, hash_len, sig, sig_size, sig_len, f_rng, p_rng); } #if defined(MBEDTLS_RSA_C) psa_md_alg = mbedtls_hash_info_psa_from_md(md_alg); if (psa_md_alg == 0) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (mbedtls_pk_get_type(ctx) == MBEDTLS_PK_OPAQUE) { const mbedtls_svc_key_id_t *key = (const mbedtls_svc_key_id_t *) ctx->pk_ctx; psa_status_t status; status = psa_sign_hash(*key, PSA_ALG_RSA_PSS(psa_md_alg), hash, hash_len, sig, sig_size, sig_len); return mbedtls_pk_error_from_psa_rsa(status); } return mbedtls_pk_psa_rsa_sign_ext(PSA_ALG_RSA_PSS(psa_md_alg), ctx->pk_ctx, hash, hash_len, sig, sig_size, sig_len); #else /* MBEDTLS_RSA_C */ return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE; #endif /* !MBEDTLS_RSA_C */ } #endif /* MBEDTLS_PSA_CRYPTO_C */ /* * 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) { if (ctx->pk_info == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (ctx->pk_info->decrypt_func == NULL) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } return ctx->pk_info->decrypt_func(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) { if (ctx->pk_info == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (ctx->pk_info->encrypt_func == NULL) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } return ctx->pk_info->encrypt_func(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, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) { if (pub->pk_info == NULL || prv->pk_info == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (f_rng == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (prv->pk_info->check_pair_func == NULL) { return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE; } if (prv->pk_info->type == MBEDTLS_PK_RSA_ALT) { if (pub->pk_info->type != MBEDTLS_PK_RSA) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } } else { if (pub->pk_info != prv->pk_info) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } } return prv->pk_info->check_pair_func(pub->pk_ctx, prv->pk_ctx, f_rng, p_rng); } /* * 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 || ctx->pk_info == NULL) { return 0; } return ctx->pk_info->get_bitlen(ctx->pk_ctx); } /* * Export debug information */ int mbedtls_pk_debug(const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items) { if (ctx->pk_info == NULL) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } if (ctx->pk_info->debug_func == NULL) { return MBEDTLS_ERR_PK_TYPE_MISMATCH; } ctx->pk_info->debug_func(ctx->pk_ctx, items); return 0; } /* * Access the PK type name */ const char *mbedtls_pk_get_name(const mbedtls_pk_context *ctx) { if (ctx == NULL || ctx->pk_info == NULL) { return "invalid PK"; } return ctx->pk_info->name; } /* * Access the PK type */ mbedtls_pk_type_t mbedtls_pk_get_type(const mbedtls_pk_context *ctx) { if (ctx == NULL || ctx->pk_info == NULL) { return MBEDTLS_PK_NONE; } return ctx->pk_info->type; } #if defined(MBEDTLS_USE_PSA_CRYPTO) /* * Load the key to a PSA key slot, * then turn the PK context into a wrapper for that key slot. * * Currently only works for EC & RSA private keys. */ int mbedtls_pk_wrap_as_opaque(mbedtls_pk_context *pk, mbedtls_svc_key_id_t *key, psa_algorithm_t alg, psa_key_usage_t usage, psa_algorithm_t alg2) { #if !defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_RSA_C) ((void) pk); ((void) key); ((void) alg); ((void) usage); ((void) alg2); #else #if defined(MBEDTLS_ECP_C) if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_ECKEY) { const mbedtls_ecp_keypair *ec; unsigned char d[MBEDTLS_ECP_MAX_BYTES]; size_t d_len; psa_ecc_family_t curve_id; psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; psa_key_type_t key_type; size_t bits; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; psa_status_t status; /* export the private key material in the format PSA wants */ ec = mbedtls_pk_ec(*pk); d_len = PSA_BITS_TO_BYTES(ec->grp.nbits); if ((ret = mbedtls_mpi_write_binary(&ec->d, d, d_len)) != 0) { return ret; } curve_id = mbedtls_ecc_group_to_psa(ec->grp.id, &bits); key_type = PSA_KEY_TYPE_ECC_KEY_PAIR(curve_id); /* prepare the key attributes */ psa_set_key_type(&attributes, key_type); psa_set_key_bits(&attributes, bits); psa_set_key_usage_flags(&attributes, usage); psa_set_key_algorithm(&attributes, alg); if (alg2 != PSA_ALG_NONE) { psa_set_key_enrollment_algorithm(&attributes, alg2); } /* import private key into PSA */ status = psa_import_key(&attributes, d, d_len, key); if (status != PSA_SUCCESS) { return mbedtls_pk_error_from_psa(status); } /* make PK context wrap the key slot */ mbedtls_pk_free(pk); mbedtls_pk_init(pk); return mbedtls_pk_setup_opaque(pk, *key); } else #endif /* MBEDTLS_ECP_C */ #if defined(MBEDTLS_RSA_C) if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_RSA) { unsigned char buf[MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES]; psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; int key_len; psa_status_t status; /* export the private key material in the format PSA wants */ key_len = mbedtls_pk_write_key_der(pk, buf, sizeof(buf)); if (key_len <= 0) { return MBEDTLS_ERR_PK_BAD_INPUT_DATA; } /* prepare the key attributes */ psa_set_key_type(&attributes, PSA_KEY_TYPE_RSA_KEY_PAIR); psa_set_key_bits(&attributes, mbedtls_pk_get_bitlen(pk)); psa_set_key_usage_flags(&attributes, usage); psa_set_key_algorithm(&attributes, alg); if (alg2 != PSA_ALG_NONE) { psa_set_key_enrollment_algorithm(&attributes, alg2); } /* import private key into PSA */ status = psa_import_key(&attributes, buf + sizeof(buf) - key_len, key_len, key); mbedtls_platform_zeroize(buf, sizeof(buf)); if (status != PSA_SUCCESS) { return mbedtls_pk_error_from_psa(status); } /* make PK context wrap the key slot */ mbedtls_pk_free(pk); mbedtls_pk_init(pk); return mbedtls_pk_setup_opaque(pk, *key); } else #endif /* MBEDTLS_RSA_C */ #endif /* !MBEDTLS_ECP_C && !MBEDTLS_RSA_C */ return MBEDTLS_ERR_PK_TYPE_MISMATCH; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #endif /* MBEDTLS_PK_C */