1 /* 2 * QEMU Crypto hash algorithms 3 * 4 * Copyright (c) 2021 Red Hat, Inc. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #include "qemu/osdep.h" 22 #include <gnutls/crypto.h> 23 #include "qapi/error.h" 24 #include "crypto/hash.h" 25 #include "hashpriv.h" 26 27 28 static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = { 29 [QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5, 30 [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1, 31 [QCRYPTO_HASH_ALG_SHA224] = GNUTLS_DIG_SHA224, 32 [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256, 33 [QCRYPTO_HASH_ALG_SHA384] = GNUTLS_DIG_SHA384, 34 [QCRYPTO_HASH_ALG_SHA512] = GNUTLS_DIG_SHA512, 35 [QCRYPTO_HASH_ALG_RIPEMD160] = GNUTLS_DIG_RMD160, 36 }; 37 38 gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg) 39 { 40 size_t i; 41 const gnutls_digest_algorithm_t *algs; 42 if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) || 43 qcrypto_hash_alg_map[alg] == GNUTLS_DIG_UNKNOWN) { 44 return false; 45 } 46 algs = gnutls_digest_list(); 47 for (i = 0; algs[i] != GNUTLS_DIG_UNKNOWN; i++) { 48 if (algs[i] == qcrypto_hash_alg_map[alg]) { 49 return true; 50 } 51 } 52 return false; 53 } 54 55 56 static int 57 qcrypto_gnutls_hash_bytesv(QCryptoHashAlgorithm alg, 58 const struct iovec *iov, 59 size_t niov, 60 uint8_t **result, 61 size_t *resultlen, 62 Error **errp) 63 { 64 int i, ret; 65 gnutls_hash_hd_t hash; 66 67 if (!qcrypto_hash_supports(alg)) { 68 error_setg(errp, 69 "Unknown hash algorithm %d", 70 alg); 71 return -1; 72 } 73 74 ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]); 75 if (*resultlen == 0) { 76 *resultlen = ret; 77 *result = g_new0(uint8_t, *resultlen); 78 } else if (*resultlen != ret) { 79 error_setg(errp, 80 "Result buffer size %zu is smaller than hash %d", 81 *resultlen, ret); 82 return -1; 83 } 84 85 ret = gnutls_hash_init(&hash, qcrypto_hash_alg_map[alg]); 86 if (ret < 0) { 87 error_setg(errp, 88 "Unable to initialize hash algorithm: %s", 89 gnutls_strerror(ret)); 90 return -1; 91 } 92 93 for (i = 0; i < niov; i++) { 94 gnutls_hash(hash, iov[i].iov_base, iov[i].iov_len); 95 } 96 97 gnutls_hash_deinit(hash, *result); 98 return 0; 99 } 100 101 102 QCryptoHashDriver qcrypto_hash_lib_driver = { 103 .hash_bytesv = qcrypto_gnutls_hash_bytesv, 104 }; 105