qemu

FORK: QEMU emulator
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hash-gcrypt.c (3213B)

      1 /*
      2  * QEMU Crypto hash algorithms
      3  *
      4  * Copyright (c) 2016 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 2.1 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 <gcrypt.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_ALG__MAX] = {
     29     [QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5,
     30     [QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1,
     31     [QCRYPTO_HASH_ALG_SHA224] = GCRY_MD_SHA224,
     32     [QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256,
     33     [QCRYPTO_HASH_ALG_SHA384] = GCRY_MD_SHA384,
     34     [QCRYPTO_HASH_ALG_SHA512] = GCRY_MD_SHA512,
     35     [QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MD_RMD160,
     36 };
     37 
     38 gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
     39 {
     40     if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
     41         qcrypto_hash_alg_map[alg] != GCRY_MD_NONE) {
     42         return true;
     43     }
     44     return false;
     45 }
     46 
     47 
     48 static int
     49 qcrypto_gcrypt_hash_bytesv(QCryptoHashAlgorithm alg,
     50                            const struct iovec *iov,
     51                            size_t niov,
     52                            uint8_t **result,
     53                            size_t *resultlen,
     54                            Error **errp)
     55 {
     56     int i, ret;
     57     gcry_md_hd_t md;
     58     unsigned char *digest;
     59 
     60     if (!qcrypto_hash_supports(alg)) {
     61         error_setg(errp,
     62                    "Unknown hash algorithm %d",
     63                    alg);
     64         return -1;
     65     }
     66 
     67     ret = gcry_md_open(&md, qcrypto_hash_alg_map[alg], 0);
     68 
     69     if (ret < 0) {
     70         error_setg(errp,
     71                    "Unable to initialize hash algorithm: %s",
     72                    gcry_strerror(ret));
     73         return -1;
     74     }
     75 
     76     for (i = 0; i < niov; i++) {
     77         gcry_md_write(md, iov[i].iov_base, iov[i].iov_len);
     78     }
     79 
     80     ret = gcry_md_get_algo_dlen(qcrypto_hash_alg_map[alg]);
     81     if (ret <= 0) {
     82         error_setg(errp,
     83                    "Unable to get hash length: %s",
     84                    gcry_strerror(ret));
     85         goto error;
     86     }
     87     if (*resultlen == 0) {
     88         *resultlen = ret;
     89         *result = g_new0(uint8_t, *resultlen);
     90     } else if (*resultlen != ret) {
     91         error_setg(errp,
     92                    "Result buffer size %zu is smaller than hash %d",
     93                    *resultlen, ret);
     94         goto error;
     95     }
     96 
     97     digest = gcry_md_read(md, 0);
     98     if (!digest) {
     99         error_setg(errp,
    100                    "No digest produced");
    101         goto error;
    102     }
    103     memcpy(*result, digest, *resultlen);
    104 
    105     gcry_md_close(md);
    106     return 0;
    107 
    108  error:
    109     gcry_md_close(md);
    110     return -1;
    111 }
    112 
    113 
    114 QCryptoHashDriver qcrypto_hash_lib_driver = {
    115     .hash_bytesv = qcrypto_gcrypt_hash_bytesv,
    116 };