crypto/hash-glib.c

   1 /*
   2  * QEMU Crypto hash algorithms
   3  *
   4  * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
   5  * Copyright (c) 2016 Red Hat, Inc.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 #include "qemu/osdep.h"
  23 #include "qapi/error.h"
  24 #include "crypto/hash.h"
  25 #include "hashpriv.h"
  26
  27
  28 static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = {
  29     [QCRYPTO_HASH_ALGO_MD5] = G_CHECKSUM_MD5,
  30     [QCRYPTO_HASH_ALGO_SHA1] = G_CHECKSUM_SHA1,
  31     [QCRYPTO_HASH_ALGO_SHA224] = -1,
  32     [QCRYPTO_HASH_ALGO_SHA256] = G_CHECKSUM_SHA256,
  33     [QCRYPTO_HASH_ALGO_SHA384] = G_CHECKSUM_SHA384,
  34     [QCRYPTO_HASH_ALGO_SHA512] = G_CHECKSUM_SHA512,
  35     [QCRYPTO_HASH_ALGO_RIPEMD160] = -1,
  36 };
  37
  38 gboolean qcrypto_hash_supports(QCryptoHashAlgo alg)
  39 {
  40     if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
  41         qcrypto_hash_alg_map[alg] != -1) {
  42         return true;
  43     }
  44     return false;
  45 }
  46
  47 static
  48 QCryptoHash *qcrypto_glib_hash_new(QCryptoHashAlgo alg,
  49                                    Error **errp)
  50 {
  51     QCryptoHash *hash;
  52
  53     hash = g_new(QCryptoHash, 1);
  54     hash->alg = alg;
  55     hash->opaque = g_checksum_new(qcrypto_hash_alg_map[alg]);
  56
  57     return hash;
  58 }
  59
  60 static
  61 void qcrypto_glib_hash_free(QCryptoHash *hash)
  62 {
  63     if (hash->opaque) {
  64         g_checksum_free(hash->opaque);
  65     }
  66
  67     g_free(hash);
  68 }
  69
  70
  71 static
  72 int qcrypto_glib_hash_update(QCryptoHash *hash,
  73                              const struct iovec *iov,
  74                              size_t niov,
  75                              Error **errp)
  76 {
  77     GChecksum *ctx = hash->opaque;
  78
  79     for (int i = 0; i < niov; i++) {
  80         g_checksum_update(ctx, iov[i].iov_base, iov[i].iov_len);
  81     }
  82
  83     return 0;
  84 }
  85
  86 static
  87 int qcrypto_glib_hash_finalize(QCryptoHash *hash,
  88                                uint8_t **result,
  89                                size_t *result_len,
  90                                Error **errp)
  91 {
  92     int ret;
  93     GChecksum *ctx = hash->opaque;
  94
  95     ret = g_checksum_type_get_length(qcrypto_hash_alg_map[hash->alg]);
  96     if (ret < 0) {
  97         error_setg(errp, "Unable to get hash length");
  98         *result_len = 0;
  99         return -1;
 100     }
 101
 102     *result_len = ret;
 103     *result = g_new(uint8_t, *result_len);
 104
 105     g_checksum_get_digest(ctx, *result, result_len);
 106     return 0;
 107 }
 108
 109 QCryptoHashDriver qcrypto_hash_lib_driver = {
 110     .hash_new      = qcrypto_glib_hash_new,
 111     .hash_update   = qcrypto_glib_hash_update,
 112     .hash_finalize = qcrypto_glib_hash_finalize,
 113     .hash_free     = qcrypto_glib_hash_free,
 114 };