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      * TODO:
  53      * Maybe we should treat some afalg errors as fatal
  54      */
  55     ret = qcrypto_hash_afalg_driver.hash_bytesv(alg, iov, niov,
  56                                                 result, resultlen,
  57                                                 NULL);
  58     if (ret == 0) {
  59         return ret;
  60     }
  61 #endif
  62
  63     return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
  64                                                result, resultlen,
  65                                                errp);
  66 }
  67
  68
  69 int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
  70                        const char *buf,
  71                        size_t len,
  72                        uint8_t **result,
  73                        size_t *resultlen,
  74                        Error **errp)
  75 {
  76     struct iovec iov = { .iov_base = (char *)buf,
  77                          .iov_len = len };
  78     return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
  79 }
  80
  81 static const char hex[] = "0123456789abcdef";
  82
  83 int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
  84                          const struct iovec *iov,
  85                          size_t niov,
  86                          char **digest,
  87                          Error **errp)
  88 {
  89     uint8_t *result = NULL;
  90     size_t resultlen = 0;
  91     size_t i;
  92
  93     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
  94         return -1;
  95     }
  96
  97     *digest = g_new0(char, (resultlen * 2) + 1);
  98     for (i = 0 ; i < resultlen ; i++) {
  99         (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
 100         (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
 101     }
 102     (*digest)[resultlen * 2] = '\0';
 103     g_free(result);
 104     return 0;
 105 }
 106
 107 int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
 108                         const char *buf,
 109                         size_t len,
 110                         char **digest,
 111                         Error **errp)
 112 {
 113     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
 114
 115     return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
 116 }
 117
 118 int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
 119                          const struct iovec *iov,
 120                          size_t niov,
 121                          char **base64,
 122                          Error **errp)
 123 {
 124     uint8_t *result = NULL;
 125     size_t resultlen = 0;
 126
 127     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
 128         return -1;
 129     }
 130
 131     *base64 = g_base64_encode(result, resultlen);
 132     g_free(result);
 133     return 0;
 134 }
 135
 136 int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
 137                         const char *buf,
 138                         size_t len,
 139                         char **base64,
 140                         Error **errp)
 141 {
 142     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
 143
 144     return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
 145 }