1 /* 2 * QEMU Crypto hash algorithms 3 * 4 * Copyright (c) 2016 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 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 "qapi/error.h" 23 #include "crypto/hash.h" 24 #include "hashpriv.h" 25 26 27 static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = { 28 [QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5, 29 [QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1, 30 [QCRYPTO_HASH_ALG_SHA224] = -1, 31 [QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256, 32 [QCRYPTO_HASH_ALG_SHA384] = -1, 33 #if GLIB_CHECK_VERSION(2, 36, 0) 34 [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512, 35 #else 36 [QCRYPTO_HASH_ALG_SHA512] = -1, 37 #endif 38 [QCRYPTO_HASH_ALG_RIPEMD160] = -1, 39 }; 40 41 gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg) 42 { 43 if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) && 44 qcrypto_hash_alg_map[alg] != -1) { 45 return true; 46 } 47 return false; 48 } 49 50 51 static int 52 qcrypto_glib_hash_bytesv(QCryptoHashAlgorithm alg, 53 const struct iovec *iov, 54 size_t niov, 55 uint8_t **result, 56 size_t *resultlen, 57 Error **errp) 58 { 59 int i, ret; 60 GChecksum *cs; 61 62 if (!qcrypto_hash_supports(alg)) { 63 error_setg(errp, 64 "Unknown hash algorithm %d", 65 alg); 66 return -1; 67 } 68 69 cs = g_checksum_new(qcrypto_hash_alg_map[alg]); 70 71 for (i = 0; i < niov; i++) { 72 g_checksum_update(cs, iov[i].iov_base, iov[i].iov_len); 73 } 74 75 ret = g_checksum_type_get_length(qcrypto_hash_alg_map[alg]); 76 if (ret < 0) { 77 error_setg(errp, "%s", 78 "Unable to get hash length"); 79 goto error; 80 } 81 if (*resultlen == 0) { 82 *resultlen = ret; 83 *result = g_new0(uint8_t, *resultlen); 84 } else if (*resultlen != ret) { 85 error_setg(errp, 86 "Result buffer size %zu is smaller than hash %d", 87 *resultlen, ret); 88 goto error; 89 } 90 91 g_checksum_get_digest(cs, *result, resultlen); 92 93 g_checksum_free(cs); 94 return 0; 95 96 error: 97 g_checksum_free(cs); 98 return -1; 99 } 100 101 102 QCryptoHashDriver qcrypto_hash_lib_driver = { 103 .hash_bytesv = qcrypto_glib_hash_bytesv, 104 }; 105