crypto/hash.c

   1 /*
   2  * QEMU Crypto hash algorithms
   3  *
   4  * Copyright (c) 2015 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 static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
  27     [QCRYPTO_HASH_ALG_MD5] = 16,
  28     [QCRYPTO_HASH_ALG_SHA1] = 20,
  29     [QCRYPTO_HASH_ALG_SHA224] = 28,
  30     [QCRYPTO_HASH_ALG_SHA256] = 32,
  31     [QCRYPTO_HASH_ALG_SHA384] = 48,
  32     [QCRYPTO_HASH_ALG_SHA512] = 64,
  33     [QCRYPTO_HASH_ALG_RIPEMD160] = 20,
  34 };
  35
  36 size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
  37 {
  38     assert(alg < G_N_ELEMENTS(qcrypto_hash_alg_size));
  39     return qcrypto_hash_alg_size[alg];
  40 }
  41
  42 int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
  43                         const struct iovec *iov,
  44                         size_t niov,
  45                         uint8_t **result,
  46                         size_t *resultlen,
  47                         Error **errp)
  48 {
  49 #ifdef CONFIG_AF_ALG
  50     int ret;
  51
  52     ret = qcrypto_hash_afalg_driver.hash_bytesv(alg, iov, niov,
  53                                                 result, resultlen,
  54                                                 errp);
  55     if (ret == 0) {
  56         return ret;
  57     }
  58
  59     /*
  60      * TODO:
  61      * Maybe we should treat some afalg errors as fatal
  62      */
  63     error_free(*errp);
  64 #endif
  65
  66     return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
  67                                                result, resultlen,
  68                                                errp);
  69 }
  70
  71
  72 int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
  73                        const char *buf,
  74                        size_t len,
  75                        uint8_t **result,
  76                        size_t *resultlen,
  77                        Error **errp)
  78 {
  79     struct iovec iov = { .iov_base = (char *)buf,
  80                          .iov_len = len };
  81     return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
  82 }
  83
  84 static const char hex[] = "0123456789abcdef";
  85
  86 int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
  87                          const struct iovec *iov,
  88                          size_t niov,
  89                          char **digest,
  90                          Error **errp)
  91 {
  92     uint8_t *result = NULL;
  93     size_t resultlen = 0;
  94     size_t i;
  95
  96     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
  97         return -1;
  98     }
  99
 100     *digest = g_new0(char, (resultlen * 2) + 1);
 101     for (i = 0 ; i < resultlen ; i++) {
 102         (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
 103         (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
 104     }
 105     (*digest)[resultlen * 2] = '\0';
 106     g_free(result);
 107     return 0;
 108 }
 109
 110 int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
 111                         const char *buf,
 112                         size_t len,
 113                         char **digest,
 114                         Error **errp)
 115 {
 116     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
 117
 118     return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
 119 }
 120
 121 int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
 122                          const struct iovec *iov,
 123                          size_t niov,
 124                          char **base64,
 125                          Error **errp)
 126 {
 127     uint8_t *result = NULL;
 128     size_t resultlen = 0;
 129
 130     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
 131         return -1;
 132     }
 133
 134     *base64 = g_base64_encode(result, resultlen);
 135     g_free(result);
 136     return 0;
 137 }
 138
 139 int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
 140                         const char *buf,
 141                         size_t len,
 142                         char **base64,
 143                         Error **errp)
 144 {
 145     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
 146
 147     return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
 148 }