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 #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     [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
  34     [QCRYPTO_HASH_ALG_RIPEMD160] = -1,
  35 };
  36
  37 gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
  38 {
  39     if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
  40         qcrypto_hash_alg_map[alg] != -1) {
  41         return true;
  42     }
  43     return false;
  44 }
  45
  46
  47 static int
  48 qcrypto_glib_hash_bytesv(QCryptoHashAlgorithm alg,
  49                          const struct iovec *iov,
  50                          size_t niov,
  51                          uint8_t **result,
  52                          size_t *resultlen,
  53                          Error **errp)
  54 {
  55     int i, ret;
  56     GChecksum *cs;
  57
  58     if (!qcrypto_hash_supports(alg)) {
  59         error_setg(errp,
  60                    "Unknown hash algorithm %d",
  61                    alg);
  62         return -1;
  63     }
  64
  65     cs = g_checksum_new(qcrypto_hash_alg_map[alg]);
  66
  67     for (i = 0; i < niov; i++) {
  68         g_checksum_update(cs, iov[i].iov_base, iov[i].iov_len);
  69     }
  70
  71     ret = g_checksum_type_get_length(qcrypto_hash_alg_map[alg]);
  72     if (ret < 0) {
  73         error_setg(errp, "%s",
  74                    "Unable to get hash length");
  75         goto error;
  76     }
  77     if (*resultlen == 0) {
  78         *resultlen = ret;
  79         *result = g_new0(uint8_t, *resultlen);
  80     } else if (*resultlen != ret) {
  81         error_setg(errp,
  82                    "Result buffer size %zu is smaller than hash %d",
  83                    *resultlen, ret);
  84         goto error;
  85     }
  86
  87     g_checksum_get_digest(cs, *result, resultlen);
  88
  89     g_checksum_free(cs);
  90     return 0;
  91
  92  error:
  93     g_checksum_free(cs);
  94     return -1;
  95 }
  96
  97
  98 QCryptoHashDriver qcrypto_hash_lib_driver = {
  99     .hash_bytesv = qcrypto_glib_hash_bytesv,
 100 };