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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 <nettle/md5.h>
#include <nettle/sha.h>
typedef void (*qcrypto_nettle_init)(void *ctx);
typedef void (*qcrypto_nettle_write)(void *ctx,
unsigned int len,
const uint8_t *buf);
typedef void (*qcrypto_nettle_result)(void *ctx,
unsigned int len,
uint8_t *buf);
union qcrypto_hash_ctx {
struct md5_ctx md5;
struct sha1_ctx sha1;
struct sha256_ctx sha256;
};
struct qcrypto_hash_alg {
qcrypto_nettle_init init;
qcrypto_nettle_write write;
qcrypto_nettle_result result;
size_t len;
} qcrypto_hash_alg_map[] = {
[QCRYPTO_HASH_ALG_MD5] = {
.init = (qcrypto_nettle_init)md5_init,
.write = (qcrypto_nettle_write)md5_update,
.result = (qcrypto_nettle_result)md5_digest,
.len = MD5_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA1] = {
.init = (qcrypto_nettle_init)sha1_init,
.write = (qcrypto_nettle_write)sha1_update,
.result = (qcrypto_nettle_result)sha1_digest,
.len = SHA1_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA256] = {
.init = (qcrypto_nettle_init)sha256_init,
.write = (qcrypto_nettle_write)sha256_update,
.result = (qcrypto_nettle_result)sha256_digest,
.len = SHA256_DIGEST_SIZE,
},
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
qcrypto_hash_alg_map[alg].init != NULL) {
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;
union qcrypto_hash_ctx ctx;
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
qcrypto_hash_alg_map[alg].init == NULL) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);
return -1;
}
qcrypto_hash_alg_map[alg].init(&ctx);
for (i = 0; i < niov; i++) {
/* Some versions of nettle have functions
* declared with 'int' instead of 'size_t'
* so to be safe avoid writing more than
* UINT_MAX bytes at a time
*/
size_t len = iov[i].iov_len;
uint8_t *base = iov[i].iov_base;
while (len) {
size_t shortlen = MIN(len, UINT_MAX);
qcrypto_hash_alg_map[alg].write(&ctx, len, base);
len -= shortlen;
base += len;
}
}
if (*resultlen == 0) {
*resultlen = qcrypto_hash_alg_map[alg].len;
*result = g_new0(uint8_t, *resultlen);
} else if (*resultlen != qcrypto_hash_alg_map[alg].len) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %zu",
*resultlen, qcrypto_hash_alg_map[alg].len);
return -1;
}
qcrypto_hash_alg_map[alg].result(&ctx, *resultlen, *result);
return 0;
}
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