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
  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
  42 int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
  43                        const char *buf,
  44                        size_t len,
  45                        uint8_t **result,
  46                        size_t *resultlen,
  47                        Error **errp)
  48 {
  49     struct iovec iov = { .iov_base = (char *)buf,
  50                          .iov_len = len };
  51     return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
  52 }
  53
  54 static const char hex[] = "0123456789abcdef";
  55
  56 int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
  57                          const struct iovec *iov,
  58                          size_t niov,
  59                          char **digest,
  60                          Error **errp)
  61 {
  62     uint8_t *result = NULL;
  63     size_t resultlen = 0;
  64     size_t i;
  65
  66     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
  67         return -1;
  68     }
  69
  70     *digest = g_new0(char, (resultlen * 2) + 1);
  71     for (i = 0 ; i < resultlen ; i++) {
  72         (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
  73         (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
  74     }
  75     (*digest)[resultlen * 2] = '\0';
  76     g_free(result);
  77     return 0;
  78 }
  79
  80 int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
  81                         const char *buf,
  82                         size_t len,
  83                         char **digest,
  84                         Error **errp)
  85 {
  86     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
  87
  88     return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
  89 }
  90
  91 int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
  92                          const struct iovec *iov,
  93                          size_t niov,
  94                          char **base64,
  95                          Error **errp)
  96 {
  97     uint8_t *result = NULL;
  98     size_t resultlen = 0;
  99
 100     if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
 101         return -1;
 102     }
 103
 104     *base64 = g_base64_encode(result, resultlen);
 105     g_free(result);
 106     return 0;
 107 }
 108
 109 int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
 110                         const char *buf,
 111                         size_t len,
 112                         char **base64,
 113                         Error **errp)
 114 {
 115     struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
 116
 117     return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
 118 }