110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/*
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* QEMU Crypto hash algorithms
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*
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* Copyright (c) 2016 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include <gcrypt.h>
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#include "qapi/error.h"
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#include "crypto/hash.h"
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static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
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[QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5,
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[QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1,
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[QCRYPTO_HASH_ALG_SHA224] = GCRY_MD_SHA224,
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[QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256,
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[QCRYPTO_HASH_ALG_SHA384] = GCRY_MD_SHA384,
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[QCRYPTO_HASH_ALG_SHA512] = GCRY_MD_SHA512,
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[QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MD_RMD160,
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};
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gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
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{
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if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
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qcrypto_hash_alg_map[alg] != GCRY_MD_NONE) {
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return true;
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}
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return false;
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}
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int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
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const struct iovec *iov,
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size_t niov,
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uint8_t **result,
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size_t *resultlen,
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Error **errp)
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{
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int i, ret;
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gcry_md_hd_t md;
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unsigned char *digest;
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if (!qcrypto_hash_supports(alg)) {
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error_setg(errp,
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"Unknown hash algorithm %d",
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alg);
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return -1;
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}
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ret = gcry_md_open(&md, qcrypto_hash_alg_map[alg], 0);
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if (ret < 0) {
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error_setg(errp,
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"Unable to initialize hash algorithm: %s",
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gcry_strerror(ret));
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return -1;
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}
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for (i = 0; i < niov; i++) {
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gcry_md_write(md, iov[i].iov_base, iov[i].iov_len);
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}
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ret = gcry_md_get_algo_dlen(qcrypto_hash_alg_map[alg]);
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if (ret <= 0) {
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error_setg(errp,
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"Unable to get hash length: %s",
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gcry_strerror(ret));
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goto error;
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}
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if (*resultlen == 0) {
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*resultlen = ret;
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*result = g_new0(uint8_t, *resultlen);
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} else if (*resultlen != ret) {
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error_setg(errp,
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"Result buffer size %zu is smaller than hash %d",
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*resultlen, ret);
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goto error;
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}
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digest = gcry_md_read(md, 0);
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if (!digest) {
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error_setg(errp,
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"No digest produced");
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goto error;
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}
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memcpy(*result, digest, *resultlen);
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gcry_md_close(md);
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return 0;
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error:
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gcry_md_close(md);
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return -1;
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}
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