LXR qemu/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 2.1 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 "qapi/error.h"
  23#include "crypto/hash.h"
  24#include "hashpriv.h"
  25
  26
  27static 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
  37gboolean 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
  47static int
  48qcrypto_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
  98QCryptoHashDriver qcrypto_hash_lib_driver = {
  99    .hash_bytesv = qcrypto_glib_hash_bytesv,
 100};
 101