diff options
Diffstat (limited to 'thirdparty/mbedtls/library/psa_crypto_rsa.c')
| -rw-r--r-- | thirdparty/mbedtls/library/psa_crypto_rsa.c | 705 |
1 files changed, 705 insertions, 0 deletions
diff --git a/thirdparty/mbedtls/library/psa_crypto_rsa.c b/thirdparty/mbedtls/library/psa_crypto_rsa.c new file mode 100644 index 0000000000..38dc3b8edc --- /dev/null +++ b/thirdparty/mbedtls/library/psa_crypto_rsa.c @@ -0,0 +1,705 @@ +/* + * 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 <psa/crypto.h> +#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 "mbedtls/psa_util.h" + +#include <stdlib.h> +#include <string.h> +#include "mbedtls/platform.h" + +#include <mbedtls/rsa.h> +#include <mbedtls/error.h> +#include "rsa_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_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; + size_t bits; + + *p_rsa = mbedtls_calloc(1, sizeof(mbedtls_rsa_context)); + if (*p_rsa == NULL) { + return PSA_ERROR_INSUFFICIENT_MEMORY; + } + mbedtls_rsa_init(*p_rsa); + + /* Parse the data. */ + if (PSA_KEY_TYPE_IS_KEY_PAIR(type)) { + status = mbedtls_to_psa_error(mbedtls_rsa_parse_key(*p_rsa, data, data_length)); + } else { + status = mbedtls_to_psa_error(mbedtls_rsa_parse_pubkey(*p_rsa, data, data_length)); + } + if (status != PSA_SUCCESS) { + 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(*p_rsa)); + if (bits > PSA_VENDOR_RSA_MAX_KEY_BITS) { + status = PSA_ERROR_NOT_SUPPORTED; + goto exit; + } + status = psa_check_rsa_key_byte_aligned(*p_rsa); + if (status != PSA_SUCCESS) { + goto exit; + } + +exit: + 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->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->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; + uint8_t *end = data + data_size; + + /* 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_rsa_write_key(rsa, data, &end); + } else { + ret = mbedtls_rsa_write_pubkey(rsa, data, &end); + } + + 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->type, key_buffer, key_buffer_size, &rsa); + if (status == PSA_SUCCESS) { + 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 *e_bytes, + size_t e_length, + int *exponent) +{ + size_t i; + uint32_t acc = 0; + + /* 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 (e_length > sizeof(acc)) { + return PSA_ERROR_NOT_SUPPORTED; + } + for (i = 0; i < e_length; i++) { + acc = (acc << 8) | e_bytes[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, + const uint8_t *custom_data, size_t custom_data_length, + 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 = 65537; + + if (custom_data_length != 0) { + status = psa_rsa_read_exponent(custom_data, custom_data_length, + &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->bits, + exponent); + if (ret != 0) { + mbedtls_rsa_free(&rsa); + return mbedtls_to_psa_error(ret); + } + + status = mbedtls_psa_rsa_export_key(attributes->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->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_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->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->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->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->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->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 */ |