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/*
* QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
*
* Copyright (c) 2015-2016 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 2.1 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 <nettle/pbkdf2.h>
#include <nettle/hmac.h>
#include "qapi/error.h"
#include "crypto/pbkdf.h"
bool qcrypto_pbkdf2_supports(QCryptoHashAlgo hash)
{
switch (hash) {
case QCRYPTO_HASH_ALGO_SHA1:
case QCRYPTO_HASH_ALGO_SHA224:
case QCRYPTO_HASH_ALGO_SHA256:
case QCRYPTO_HASH_ALGO_SHA384:
case QCRYPTO_HASH_ALGO_SHA512:
case QCRYPTO_HASH_ALGO_RIPEMD160:
return true;
default:
return false;
}
}
int qcrypto_pbkdf2(QCryptoHashAlgo hash,
const uint8_t *key, size_t nkey,
const uint8_t *salt, size_t nsalt,
uint64_t iterations,
uint8_t *out, size_t nout,
Error **errp)
{
union {
struct hmac_md5_ctx md5;
struct hmac_sha1_ctx sha1;
struct hmac_sha224_ctx sha224;
struct hmac_sha256_ctx sha256;
struct hmac_sha384_ctx sha384;
struct hmac_sha512_ctx sha512;
struct hmac_ripemd160_ctx ripemd160;
} ctx;
if (iterations > UINT_MAX) {
error_setg_errno(errp, ERANGE,
"PBKDF iterations %llu must be less than %u",
(long long unsigned)iterations, UINT_MAX);
return -1;
}
switch (hash) {
case QCRYPTO_HASH_ALGO_MD5:
hmac_md5_set_key(&ctx.md5, nkey, key);
PBKDF2(&ctx.md5, hmac_md5_update, hmac_md5_digest,
MD5_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
break;
case QCRYPTO_HASH_ALGO_SHA1:
hmac_sha1_set_key(&ctx.sha1, nkey, key);
PBKDF2(&ctx.sha1, hmac_sha1_update, hmac_sha1_digest,
SHA1_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
break;
case QCRYPTO_HASH_ALGO_SHA224:
hmac_sha224_set_key(&ctx.sha224, nkey, key);
PBKDF2(&ctx.sha224, hmac_sha224_update, hmac_sha224_digest,
SHA224_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
break;
case QCRYPTO_HASH_ALGO_SHA256:
hmac_sha256_set_key(&ctx.sha256, nkey, key);
PBKDF2(&ctx.sha256, hmac_sha256_update, hmac_sha256_digest,
SHA256_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
break;
case QCRYPTO_HASH_ALGO_SHA384:
hmac_sha384_set_key(&ctx.sha384, nkey, key);
PBKDF2(&ctx.sha384, hmac_sha384_update, hmac_sha384_digest,
SHA384_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
break;
case QCRYPTO_HASH_ALGO_SHA512:
hmac_sha512_set_key(&ctx.sha512, nkey, key);
PBKDF2(&ctx.sha512, hmac_sha512_update, hmac_sha512_digest,
SHA512_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
break;
case QCRYPTO_HASH_ALGO_RIPEMD160:
hmac_ripemd160_set_key(&ctx.ripemd160, nkey, key);
PBKDF2(&ctx.ripemd160, hmac_ripemd160_update, hmac_ripemd160_digest,
RIPEMD160_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
break;
default:
error_setg_errno(errp, ENOSYS,
"PBKDF does not support hash algorithm %s",
QCryptoHashAlgo_str(hash));
return -1;
}
return 0;
}
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