/* * PSA RSA layer on top of Mbed TLS crypto */ /* * 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_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 #include #include "mbedtls/platform.h" #if !defined(MBEDTLS_PLATFORM_C) #define mbedtls_calloc calloc #define mbedtls_free free #endif #include #include #include #include "pk_wrap.h" #include "md_internal.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) || \ 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) || * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */ #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \ 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 ); } 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 ) { #if defined(MBEDTLS_PK_WRITE_C) 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 ); #else (void) type; (void) rsa; (void) data; (void) data_size; (void) data_length; return( PSA_ERROR_NOT_SUPPORTED ); #endif /* MBEDTLS_PK_WRITE_C */ } 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) || * defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */ #if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) && \ defined(MBEDTLS_GENPRIME) 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) * defined(MBEDTLS_GENPRIME) */ /****************************************************************/ /* Sign/verify hashes */ /****************************************************************/ #if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \ defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) /* Convert a hash algorithm from PSA to MD identifier */ static inline mbedtls_md_type_t get_md_alg_from_psa( psa_algorithm_t psa_alg ) { switch( psa_alg ) { case PSA_ALG_MD5: return( MBEDTLS_MD_MD5 ); case PSA_ALG_RIPEMD160: return( MBEDTLS_MD_RIPEMD160 ); case PSA_ALG_SHA_1: return( MBEDTLS_MD_SHA1 ); case PSA_ALG_SHA_224: return( MBEDTLS_MD_SHA224 ); case PSA_ALG_SHA_256: return( MBEDTLS_MD_SHA256 ); case PSA_ALG_SHA_384: return( MBEDTLS_MD_SHA384 ); case PSA_ALG_SHA_512: return( MBEDTLS_MD_SHA512 ); default: return( MBEDTLS_MD_NONE ); } } /* 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 = get_md_alg_from_psa( 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_internal_get_size( *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 ); const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg ); mbedtls_md_type_t md_alg = mbedtls_md_get_type( md_info ); 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 */