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/*
* QEMU Crypto hash algorithms
*
* Copyright (c) 2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "crypto/hash.h"
#include "gcrypt.h"
static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5,
[QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1,
[QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256,
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
qcrypto_hash_alg_map[alg] != GCRY_MD_NONE) {
return true;
}
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,
uint8_t **result,
size_t *resultlen,
Error **errp)
{
int i, ret;
gcry_md_hd_t md;
unsigned char *digest;
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
qcrypto_hash_alg_map[alg] == GCRY_MD_NONE) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);
return -1;
}
ret = gcry_md_open(&md, qcrypto_hash_alg_map[alg], 0);
if (ret < 0) {
error_setg(errp,
"Unable to initialize hash algorithm: %s",
gcry_strerror(ret));
return -1;
}
for (i = 0; i < niov; i++) {
gcry_md_write(md, iov[i].iov_base, iov[i].iov_len);
}
ret = gcry_md_get_algo_dlen(qcrypto_hash_alg_map[alg]);
if (ret <= 0) {
error_setg(errp,
"Unable to get hash length: %s",
gcry_strerror(ret));
goto error;
}
if (*resultlen == 0) {
*resultlen = ret;
*result = g_new0(uint8_t, *resultlen);
} else if (*resultlen != ret) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %d",
*resultlen, ret);
goto error;
}
digest = gcry_md_read(md, 0);
if (!digest) {
error_setg(errp,
"No digest produced");
goto error;
}
memcpy(*result, digest, *resultlen);
gcry_md_close(md);
return 0;
error:
gcry_md_close(md);
return -1;
}
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