| 1 | /* |
| 2 | * QEMU Crypto hash algorithms |
| 3 | * |
| 4 | * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates |
| 5 | * Copyright (c) 2016 Red Hat, Inc. |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include "qemu/osdep.h" |
| 23 | #include <gcrypt.h> |
| 24 | #include "qapi/error.h" |
| 25 | #include "crypto/hash.h" |
| 26 | #include "hashpriv.h" |
| 27 | |
| 28 | |
| 29 | static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = { |
| 30 | [QCRYPTO_HASH_ALGO_MD5] = GCRY_MD_MD5, |
| 31 | [QCRYPTO_HASH_ALGO_SHA1] = GCRY_MD_SHA1, |
| 32 | [QCRYPTO_HASH_ALGO_SHA224] = GCRY_MD_SHA224, |
| 33 | [QCRYPTO_HASH_ALGO_SHA256] = GCRY_MD_SHA256, |
| 34 | [QCRYPTO_HASH_ALGO_SHA384] = GCRY_MD_SHA384, |
| 35 | [QCRYPTO_HASH_ALGO_SHA512] = GCRY_MD_SHA512, |
| 36 | [QCRYPTO_HASH_ALGO_RIPEMD160] = GCRY_MD_RMD160, |
| 37 | #ifdef CONFIG_CRYPTO_SM3 |
| 38 | [QCRYPTO_HASH_ALGO_SM3] = GCRY_MD_SM3, |
| 39 | #endif |
| 40 | }; |
| 41 | |
| 42 | gboolean qcrypto_hash_supports(QCryptoHashAlgo alg) |
| 43 | { |
| 44 | if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) && |
| 45 | qcrypto_hash_alg_map[alg] != GCRY_MD_NONE) { |
| 46 | return gcry_md_test_algo(qcrypto_hash_alg_map[alg]) == 0; |
| 47 | } |
| 48 | return false; |
| 49 | } |
| 50 | |
| 51 | static |
| 52 | QCryptoHash *qcrypto_gcrypt_hash_new(QCryptoHashAlgo alg, Error **errp) |
| 53 | { |
| 54 | QCryptoHash *hash; |
| 55 | gcry_error_t ret; |
| 56 | |
| 57 | hash = g_new(QCryptoHash, 1); |
| 58 | hash->alg = alg; |
| 59 | hash->opaque = g_new(gcry_md_hd_t, 1); |
| 60 | |
| 61 | ret = gcry_md_open((gcry_md_hd_t *) hash->opaque, |
| 62 | qcrypto_hash_alg_map[alg], 0); |
| 63 | if (ret != 0) { |
| 64 | error_setg(errp, |
| 65 | "Unable to initialize hash algorithm: %s", |
| 66 | gcry_strerror(ret)); |
| 67 | g_free(hash->opaque); |
| 68 | g_free(hash); |
| 69 | return NULL; |
| 70 | } |
| 71 | return hash; |
| 72 | } |
| 73 | |
| 74 | static |
| 75 | void qcrypto_gcrypt_hash_free(QCryptoHash *hash) |
| 76 | { |
| 77 | gcry_md_hd_t *ctx = hash->opaque; |
| 78 | |
| 79 | if (ctx) { |
| 80 | gcry_md_close(*ctx); |
| 81 | g_free(ctx); |
| 82 | } |
| 83 | |
| 84 | g_free(hash); |
| 85 | } |
| 86 | |
| 87 | |
| 88 | static |
| 89 | int qcrypto_gcrypt_hash_update(QCryptoHash *hash, |
| 90 | const struct iovec *iov, |
| 91 | size_t niov, |
| 92 | Error **errp) |
| 93 | { |
| 94 | gcry_md_hd_t *ctx = hash->opaque; |
| 95 | |
| 96 | for (int i = 0; i < niov; i++) { |
| 97 | gcry_md_write(*ctx, iov[i].iov_base, iov[i].iov_len); |
| 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static |
| 104 | int qcrypto_gcrypt_hash_finalize(QCryptoHash *hash, |
| 105 | uint8_t **result, |
| 106 | size_t *result_len, |
| 107 | Error **errp) |
| 108 | { |
| 109 | int ret; |
| 110 | unsigned char *digest; |
| 111 | gcry_md_hd_t *ctx = hash->opaque; |
| 112 | |
| 113 | ret = gcry_md_get_algo_dlen(qcrypto_hash_alg_map[hash->alg]); |
| 114 | if (ret == 0) { |
| 115 | error_setg(errp, "Unable to get hash length"); |
| 116 | return -1; |
| 117 | } |
| 118 | |
| 119 | if (*result_len == 0) { |
| 120 | *result_len = ret; |
| 121 | *result = g_new(uint8_t, *result_len); |
| 122 | } else if (*result_len != ret) { |
| 123 | error_setg(errp, |
| 124 | "Result buffer size %zu is smaller than hash %d", |
| 125 | *result_len, ret); |
| 126 | return -1; |
| 127 | } |
| 128 | |
| 129 | /* Digest is freed by gcry_md_close(), copy it */ |
| 130 | digest = gcry_md_read(*ctx, 0); |
| 131 | memcpy(*result, digest, *result_len); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | QCryptoHashDriver qcrypto_hash_lib_driver = { |
| 136 | .hash_new = qcrypto_gcrypt_hash_new, |
| 137 | .hash_update = qcrypto_gcrypt_hash_update, |
| 138 | .hash_finalize = qcrypto_gcrypt_hash_finalize, |
| 139 | .hash_free = qcrypto_gcrypt_hash_free, |
| 140 | }; |