crypto/hash-glib.c

   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 }