/* * PSA RSA layer on top of Mbed TLS crypto */ /* * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */ #include "common.h" #if defined(MBEDTLS_PSA_CRYPTO_C) #include #include "psa/crypto_values.h" #include "psa_crypto_core.h" #include "psa_crypto_random_impl.h" #include "psa_crypto_rsa.h" #include "psa_crypto_hash.h" #include "md_psa.h" #include #include #include "mbedtls/platform.h" #include #include #include #include "pk_wrap.h" #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) || \ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) || \ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) || \ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) /* Mbed TLS doesn't support non-byte-aligned key sizes (i.e. key sizes * that are not a multiple of 8) well. For example, there is only * mbedtls_rsa_get_len(), which returns a number of bytes, and no * way to return the exact bit size of a key. * To keep things simple, reject non-byte-aligned key sizes. */ static psa_status_t psa_check_rsa_key_byte_aligned( const mbedtls_rsa_context *rsa) { mbedtls_mpi n; psa_status_t status; mbedtls_mpi_init(&n); status = mbedtls_to_psa_error( mbedtls_rsa_export(rsa, &n, NULL, NULL, NULL, NULL)); if (status == PSA_SUCCESS) { if (mbedtls_mpi_bitlen(&n) % 8 != 0) { status = PSA_ERROR_NOT_SUPPORTED; } } mbedtls_mpi_free(&n); return status; } psa_status_t mbedtls_psa_rsa_load_representation( psa_key_type_t type, const uint8_t *data, size_t data_length, mbedtls_rsa_context **p_rsa) { psa_status_t status; mbedtls_pk_context ctx; size_t bits; mbedtls_pk_init(&ctx); /* Parse the data. */ if (PSA_KEY_TYPE_IS_KEY_PAIR(type)) { status = mbedtls_to_psa_error( mbedtls_pk_parse_key(&ctx, data, data_length, NULL, 0, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE)); } else { status = mbedtls_to_psa_error( mbedtls_pk_parse_public_key(&ctx, data, data_length)); } if (status != PSA_SUCCESS) { goto exit; } /* We have something that the pkparse module recognizes. If it is a * valid RSA key, store it. */ if (mbedtls_pk_get_type(&ctx) != MBEDTLS_PK_RSA) { status = PSA_ERROR_INVALID_ARGUMENT; goto exit; } /* The size of an RSA key doesn't have to be a multiple of 8. Mbed TLS * supports non-byte-aligned key sizes, but not well. For example, * mbedtls_rsa_get_len() returns the key size in bytes, not in bits. */ bits = PSA_BYTES_TO_BITS(mbedtls_rsa_get_len(mbedtls_pk_rsa(ctx))); if (bits > PSA_VENDOR_RSA_MAX_KEY_BITS) { status = PSA_ERROR_NOT_SUPPORTED; goto exit; } status = psa_check_rsa_key_byte_aligned(mbedtls_pk_rsa(ctx)); if (status != PSA_SUCCESS) { goto exit; } /* Copy out the pointer to the RSA context, and reset the PK context * such that pk_free doesn't free the RSA context we just grabbed. */ *p_rsa = mbedtls_pk_rsa(ctx); ctx.pk_info = NULL; exit: mbedtls_pk_free(&ctx); return status; } #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) || * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) || * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) || * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */ #if (defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) && \ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT)) || \ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) psa_status_t mbedtls_psa_rsa_import_key( const psa_key_attributes_t *attributes, const uint8_t *data, size_t data_length, uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length, size_t *bits) { psa_status_t status; mbedtls_rsa_context *rsa = NULL; /* Parse input */ status = mbedtls_psa_rsa_load_representation(attributes->core.type, data, data_length, &rsa); if (status != PSA_SUCCESS) { goto exit; } *bits = (psa_key_bits_t) PSA_BYTES_TO_BITS(mbedtls_rsa_get_len(rsa)); /* Re-export the data to PSA export format, such that we can store export * representation in the key slot. Export representation in case of RSA is * the smallest representation that's allowed as input, so a straight-up * allocation of the same size as the input buffer will be large enough. */ status = mbedtls_psa_rsa_export_key(attributes->core.type, rsa, key_buffer, key_buffer_size, key_buffer_length); exit: /* Always free the RSA object */ mbedtls_rsa_free(rsa); mbedtls_free(rsa); return status; } #endif /* (defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_IMPORT) && * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT)) || * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */ #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) || \ defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) psa_status_t mbedtls_psa_rsa_export_key(psa_key_type_t type, mbedtls_rsa_context *rsa, uint8_t *data, size_t data_size, size_t *data_length) { int ret; mbedtls_pk_context pk; uint8_t *pos = data + data_size; mbedtls_pk_init(&pk); pk.pk_info = &mbedtls_rsa_info; pk.pk_ctx = rsa; /* PSA Crypto API defines the format of an RSA key as a DER-encoded * representation of the non-encrypted PKCS#1 RSAPrivateKey for a * private key and of the RFC3279 RSAPublicKey for a public key. */ if (PSA_KEY_TYPE_IS_KEY_PAIR(type)) { ret = mbedtls_pk_write_key_der(&pk, data, data_size); } else { ret = mbedtls_pk_write_pubkey(&pos, data, &pk); } if (ret < 0) { /* Clean up in case pk_write failed halfway through. */ memset(data, 0, data_size); return mbedtls_to_psa_error(ret); } /* The mbedtls_pk_xxx functions write to the end of the buffer. * Move the data to the beginning and erase remaining data * at the original location. */ if (2 * (size_t) ret <= data_size) { memcpy(data, data + data_size - ret, ret); memset(data + data_size - ret, 0, ret); } else if ((size_t) ret < data_size) { memmove(data, data + data_size - ret, ret); memset(data + ret, 0, data_size - ret); } *data_length = ret; return PSA_SUCCESS; } psa_status_t mbedtls_psa_rsa_export_public_key( const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, uint8_t *data, size_t data_size, size_t *data_length) { psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; mbedtls_rsa_context *rsa = NULL; status = mbedtls_psa_rsa_load_representation( attributes->core.type, key_buffer, key_buffer_size, &rsa); if (status != PSA_SUCCESS) { return status; } status = mbedtls_psa_rsa_export_key(PSA_KEY_TYPE_RSA_PUBLIC_KEY, rsa, data, data_size, data_length); mbedtls_rsa_free(rsa); mbedtls_free(rsa); return status; } #endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_EXPORT) || * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */ #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE) static psa_status_t psa_rsa_read_exponent(const uint8_t *domain_parameters, size_t domain_parameters_size, int *exponent) { size_t i; uint32_t acc = 0; if (domain_parameters_size == 0) { *exponent = 65537; return PSA_SUCCESS; } /* Mbed TLS encodes the public exponent as an int. For simplicity, only * support values that fit in a 32-bit integer, which is larger than * int on just about every platform anyway. */ if (domain_parameters_size > sizeof(acc)) { return PSA_ERROR_NOT_SUPPORTED; } for (i = 0; i < domain_parameters_size; i++) { acc = (acc << 8) | domain_parameters[i]; } if (acc > INT_MAX) { return PSA_ERROR_NOT_SUPPORTED; } *exponent = acc; return PSA_SUCCESS; } psa_status_t mbedtls_psa_rsa_generate_key( const psa_key_attributes_t *attributes, uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length) { psa_status_t status; mbedtls_rsa_context rsa; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; int exponent; status = psa_rsa_read_exponent(attributes->domain_parameters, attributes->domain_parameters_size, &exponent); if (status != PSA_SUCCESS) { return status; } mbedtls_rsa_init(&rsa); ret = mbedtls_rsa_gen_key(&rsa, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE, (unsigned int) attributes->core.bits, exponent); if (ret != 0) { return mbedtls_to_psa_error(ret); } status = mbedtls_psa_rsa_export_key(attributes->core.type, &rsa, key_buffer, key_buffer_size, key_buffer_length); mbedtls_rsa_free(&rsa); return status; } #endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR_GENERATE) */ /****************************************************************/ /* Sign/verify hashes */ /****************************************************************/ #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) /* Decode the hash algorithm from alg and store the mbedtls encoding in * md_alg. Verify that the hash length is acceptable. */ static psa_status_t psa_rsa_decode_md_type(psa_algorithm_t alg, size_t hash_length, mbedtls_md_type_t *md_alg) { psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH(alg); *md_alg = mbedtls_md_type_from_psa_alg(hash_alg); /* The Mbed TLS RSA module uses an unsigned int for hash length * parameters. Validate that it fits so that we don't risk an * overflow later. */ #if SIZE_MAX > UINT_MAX if (hash_length > UINT_MAX) { return PSA_ERROR_INVALID_ARGUMENT; } #endif /* For signatures using a hash, the hash length must be correct. */ if (alg != PSA_ALG_RSA_PKCS1V15_SIGN_RAW) { if (*md_alg == MBEDTLS_MD_NONE) { return PSA_ERROR_NOT_SUPPORTED; } if (mbedtls_md_get_size_from_type(*md_alg) != hash_length) { return PSA_ERROR_INVALID_ARGUMENT; } } return PSA_SUCCESS; } psa_status_t mbedtls_psa_rsa_sign_hash( const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg, const uint8_t *hash, size_t hash_length, uint8_t *signature, size_t signature_size, size_t *signature_length) { psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; mbedtls_rsa_context *rsa = NULL; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_type_t md_alg; status = mbedtls_psa_rsa_load_representation(attributes->core.type, key_buffer, key_buffer_size, &rsa); if (status != PSA_SUCCESS) { return status; } status = psa_rsa_decode_md_type(alg, hash_length, &md_alg); if (status != PSA_SUCCESS) { goto exit; } if (signature_size < mbedtls_rsa_get_len(rsa)) { status = PSA_ERROR_BUFFER_TOO_SMALL; goto exit; } #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) if (PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg)) { ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE); if (ret == 0) { ret = mbedtls_rsa_pkcs1_sign(rsa, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE, md_alg, (unsigned int) hash_length, hash, signature); } } else #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN */ #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) if (PSA_ALG_IS_RSA_PSS(alg)) { ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V21, md_alg); if (ret == 0) { ret = mbedtls_rsa_rsassa_pss_sign(rsa, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE, MBEDTLS_MD_NONE, (unsigned int) hash_length, hash, signature); } } else #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS */ { status = PSA_ERROR_INVALID_ARGUMENT; goto exit; } if (ret == 0) { *signature_length = mbedtls_rsa_get_len(rsa); } status = mbedtls_to_psa_error(ret); exit: mbedtls_rsa_free(rsa); mbedtls_free(rsa); return status; } #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) static int rsa_pss_expected_salt_len(psa_algorithm_t alg, const mbedtls_rsa_context *rsa, size_t hash_length) { if (PSA_ALG_IS_RSA_PSS_ANY_SALT(alg)) { return MBEDTLS_RSA_SALT_LEN_ANY; } /* Otherwise: standard salt length, i.e. largest possible salt length * up to the hash length. */ int klen = (int) mbedtls_rsa_get_len(rsa); // known to fit int hlen = (int) hash_length; // known to fit int room = klen - 2 - hlen; if (room < 0) { return 0; // there is no valid signature in this case anyway } else if (room > hlen) { return hlen; } else { return room; } } #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS */ psa_status_t mbedtls_psa_rsa_verify_hash( const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg, const uint8_t *hash, size_t hash_length, const uint8_t *signature, size_t signature_length) { psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; mbedtls_rsa_context *rsa = NULL; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_type_t md_alg; status = mbedtls_psa_rsa_load_representation(attributes->core.type, key_buffer, key_buffer_size, &rsa); if (status != PSA_SUCCESS) { goto exit; } status = psa_rsa_decode_md_type(alg, hash_length, &md_alg); if (status != PSA_SUCCESS) { goto exit; } if (signature_length != mbedtls_rsa_get_len(rsa)) { status = PSA_ERROR_INVALID_SIGNATURE; goto exit; } #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) if (PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg)) { ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE); if (ret == 0) { ret = mbedtls_rsa_pkcs1_verify(rsa, md_alg, (unsigned int) hash_length, hash, signature); } } else #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN */ #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) if (PSA_ALG_IS_RSA_PSS(alg)) { ret = mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V21, md_alg); if (ret == 0) { int slen = rsa_pss_expected_salt_len(alg, rsa, hash_length); ret = mbedtls_rsa_rsassa_pss_verify_ext(rsa, md_alg, (unsigned) hash_length, hash, md_alg, slen, signature); } } else #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS */ { status = PSA_ERROR_INVALID_ARGUMENT; goto exit; } /* Mbed TLS distinguishes "invalid padding" from "valid padding but * the rest of the signature is invalid". This has little use in * practice and PSA doesn't report this distinction. */ status = (ret == MBEDTLS_ERR_RSA_INVALID_PADDING) ? PSA_ERROR_INVALID_SIGNATURE : mbedtls_to_psa_error(ret); exit: mbedtls_rsa_free(rsa); mbedtls_free(rsa); return status; } #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) */ /****************************************************************/ /* Asymmetric cryptography */ /****************************************************************/ #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) static int psa_rsa_oaep_set_padding_mode(psa_algorithm_t alg, mbedtls_rsa_context *rsa) { psa_algorithm_t hash_alg = PSA_ALG_RSA_OAEP_GET_HASH(alg); mbedtls_md_type_t md_alg = mbedtls_md_type_from_psa_alg(hash_alg); /* Just to get the error status right, as rsa_set_padding() doesn't * distinguish between "bad RSA algorithm" and "unknown hash". */ if (mbedtls_md_info_from_type(md_alg) == NULL) { return PSA_ERROR_NOT_SUPPORTED; } return mbedtls_rsa_set_padding(rsa, MBEDTLS_RSA_PKCS_V21, md_alg); } #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */ psa_status_t mbedtls_psa_asymmetric_encrypt(const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg, const uint8_t *input, size_t input_length, const uint8_t *salt, size_t salt_length, uint8_t *output, size_t output_size, size_t *output_length) { psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; (void) key_buffer; (void) key_buffer_size; (void) input; (void) input_length; (void) salt; (void) salt_length; (void) output; (void) output_size; (void) output_length; if (PSA_KEY_TYPE_IS_RSA(attributes->core.type)) { #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) mbedtls_rsa_context *rsa = NULL; status = mbedtls_psa_rsa_load_representation(attributes->core.type, key_buffer, key_buffer_size, &rsa); if (status != PSA_SUCCESS) { goto rsa_exit; } if (output_size < mbedtls_rsa_get_len(rsa)) { status = PSA_ERROR_BUFFER_TOO_SMALL; goto rsa_exit; } #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */ if (alg == PSA_ALG_RSA_PKCS1V15_CRYPT) { #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) status = mbedtls_to_psa_error( mbedtls_rsa_pkcs1_encrypt(rsa, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE, input_length, input, output)); #else status = PSA_ERROR_NOT_SUPPORTED; #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT */ } else if (PSA_ALG_IS_RSA_OAEP(alg)) { #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) status = mbedtls_to_psa_error( psa_rsa_oaep_set_padding_mode(alg, rsa)); if (status != PSA_SUCCESS) { goto rsa_exit; } status = mbedtls_to_psa_error( mbedtls_rsa_rsaes_oaep_encrypt(rsa, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE, salt, salt_length, input_length, input, output)); #else status = PSA_ERROR_NOT_SUPPORTED; #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP */ } else { status = PSA_ERROR_INVALID_ARGUMENT; } #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) rsa_exit: if (status == PSA_SUCCESS) { *output_length = mbedtls_rsa_get_len(rsa); } mbedtls_rsa_free(rsa); mbedtls_free(rsa); #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */ } else { status = PSA_ERROR_NOT_SUPPORTED; } return status; } psa_status_t mbedtls_psa_asymmetric_decrypt(const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg, const uint8_t *input, size_t input_length, const uint8_t *salt, size_t salt_length, uint8_t *output, size_t output_size, size_t *output_length) { psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; (void) key_buffer; (void) key_buffer_size; (void) input; (void) input_length; (void) salt; (void) salt_length; (void) output; (void) output_size; (void) output_length; *output_length = 0; if (attributes->core.type == PSA_KEY_TYPE_RSA_KEY_PAIR) { #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) mbedtls_rsa_context *rsa = NULL; status = mbedtls_psa_rsa_load_representation(attributes->core.type, key_buffer, key_buffer_size, &rsa); if (status != PSA_SUCCESS) { goto rsa_exit; } if (input_length != mbedtls_rsa_get_len(rsa)) { status = PSA_ERROR_INVALID_ARGUMENT; goto rsa_exit; } #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */ if (alg == PSA_ALG_RSA_PKCS1V15_CRYPT) { #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) status = mbedtls_to_psa_error( mbedtls_rsa_pkcs1_decrypt(rsa, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE, output_length, input, output, output_size)); #else status = PSA_ERROR_NOT_SUPPORTED; #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT */ } else if (PSA_ALG_IS_RSA_OAEP(alg)) { #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) status = mbedtls_to_psa_error( psa_rsa_oaep_set_padding_mode(alg, rsa)); if (status != PSA_SUCCESS) { goto rsa_exit; } status = mbedtls_to_psa_error( mbedtls_rsa_rsaes_oaep_decrypt(rsa, mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE, salt, salt_length, output_length, input, output, output_size)); #else status = PSA_ERROR_NOT_SUPPORTED; #endif /* MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP */ } else { status = PSA_ERROR_INVALID_ARGUMENT; } #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) rsa_exit: mbedtls_rsa_free(rsa); mbedtls_free(rsa); #endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_CRYPT) || * defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_OAEP) */ } else { status = PSA_ERROR_NOT_SUPPORTED; } return status; } #endif /* MBEDTLS_PSA_CRYPTO_C */