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 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
  26static 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
  40gboolean 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
  50int 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