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