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 "crypto/hash.h"
  23 #include "hashpriv.h"
  24
  25 static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
  26     [QCRYPTO_HASH_ALG_MD5] = 16,
  27     [QCRYPTO_HASH_ALG_SHA1] = 20,
  28     [QCRYPTO_HASH_ALG_SHA224] = 28,
  29     [QCRYPTO_HASH_ALG_SHA256] = 32,
  30     [QCRYPTO_HASH_ALG_SHA384] = 48,
  31     [QCRYPTO_HASH_ALG_SHA512] = 64,
  32     [QCRYPTO_HASH_ALG_RIPEMD160] = 20,
  33 };
  34
  35 size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
  36 {
  37     assert(alg < G_N_ELEMENTS(qcrypto_hash_alg_size));
  38     return qcrypto_hash_alg_size[alg];
  39 }
  40
  41 int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
  42                         const struct iovec *iov,
  43                         size_t niov,
  44                         uint8_t **result,
  45                         size_t *resultlen,
  46                         Error **errp)
  47 {
  48 #ifdef CONFIG_AF_ALG
  49     int ret;
  50     /*
  51      * TODO:
  52      * Maybe we should treat some afalg errors as fatal
  53      */
  54     ret = qcrypto_hash_afalg_driver.hash_bytesv(alg, iov, niov,
  55                                                 result, resultlen,
  56                                                 NULL);
  57     if (ret == 0) {
  58         return ret;
  59     }
  60 #endif
  61
  62     return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
  63                                                result, resultlen,
  64                                                errp);
  65 }
  66
  67
  68 int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
  69                        const char *buf,
  70                        size_t len,
  71                        uint8_t **result,
  72                        size_t *resultlen,
  73                        Error **errp)
  74 {
  75     struct iovec iov = { .iov_base = (char *)buf,
  76                          .iov_len = len };
  77     return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
  78 }
  79
  80 static const char hex[] = "0123456789abcdef";
  81
  82 int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
  83                          const struct iovec *iov,
  84                          size_t niov,
  85                          char **digest,
  86                          Error **errp)
  87 {
  88     uint8_t *result = NULL;
  89     size_t resultlen = 0;
  90     size_t i;
  91
  92     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
  93         return -1;
  94     }
  95
  96     *digest = g_new0(char, (resultlen * 2) + 1);
  97     for (i = 0 ; i < resultlen ; i++) {
  98         (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
  99         (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
 100     }
 101     (*digest)[resultlen * 2] = '\0';
 102     g_free(result);
 103     return 0;
 104 }
 105
 106 int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
 107                         const char *buf,
 108                         size_t len,
 109                         char **digest,
 110                         Error **errp)
 111 {
 112     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
 113
 114     return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
 115 }
 116
 117 int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
 118                          const struct iovec *iov,
 119                          size_t niov,
 120                          char **base64,
 121                          Error **errp)
 122 {
 123     uint8_t *result = NULL;
 124     size_t resultlen = 0;
 125
 126     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
 127         return -1;
 128     }
 129
 130     *base64 = g_base64_encode(result, resultlen);
 131     g_free(result);
 132     return 0;
 133 }
 134
 135 int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
 136                         const char *buf,
 137                         size_t len,
 138                         char **base64,
 139                         Error **errp)
 140 {
 141     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
 142
 143     return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
 144 }