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141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* QEMU Crypto hash algorithms
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*
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* Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
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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 2.1 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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#include "hashpriv.h"
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static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = {
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[QCRYPTO_HASH_ALGO_MD5] = GCRY_MD_MD5,
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[QCRYPTO_HASH_ALGO_SHA1] = GCRY_MD_SHA1,
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[QCRYPTO_HASH_ALGO_SHA224] = GCRY_MD_SHA224,
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[QCRYPTO_HASH_ALGO_SHA256] = GCRY_MD_SHA256,
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[QCRYPTO_HASH_ALGO_SHA384] = GCRY_MD_SHA384,
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[QCRYPTO_HASH_ALGO_SHA512] = GCRY_MD_SHA512,
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[QCRYPTO_HASH_ALGO_RIPEMD160] = GCRY_MD_RMD160,
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#ifdef CONFIG_CRYPTO_SM3
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[QCRYPTO_HASH_ALGO_SM3] = GCRY_MD_SM3,
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#endif
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};
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gboolean qcrypto_hash_supports(QCryptoHashAlgo 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 gcry_md_test_algo(qcrypto_hash_alg_map[alg]) == 0;
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}
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return false;
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}
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static
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QCryptoHash *qcrypto_gcrypt_hash_new(QCryptoHashAlgo alg, Error **errp)
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{
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QCryptoHash *hash;
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gcry_error_t ret;
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hash = g_new(QCryptoHash, 1);
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hash->alg = alg;
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hash->opaque = g_new(gcry_md_hd_t, 1);
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ret = gcry_md_open((gcry_md_hd_t *) hash->opaque,
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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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g_free(hash->opaque);
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g_free(hash);
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return NULL;
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}
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return hash;
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}
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static
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void qcrypto_gcrypt_hash_free(QCryptoHash *hash)
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{
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gcry_md_hd_t *ctx = hash->opaque;
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if (ctx) {
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gcry_md_close(*ctx);
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g_free(ctx);
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}
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g_free(hash);
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}
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static
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int qcrypto_gcrypt_hash_update(QCryptoHash *hash,
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const struct iovec *iov,
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size_t niov,
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Error **errp)
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{
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gcry_md_hd_t *ctx = hash->opaque;
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for (int i = 0; i < niov; i++) {
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gcry_md_write(*ctx, iov[i].iov_base, iov[i].iov_len);
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}
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return 0;
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}
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static
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int qcrypto_gcrypt_hash_finalize(QCryptoHash *hash,
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uint8_t **result,
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size_t *result_len,
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Error **errp)
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{
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int ret;
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unsigned char *digest;
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gcry_md_hd_t *ctx = hash->opaque;
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ret = gcry_md_get_algo_dlen(qcrypto_hash_alg_map[hash->alg]);
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if (ret == 0) {
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error_setg(errp, "Unable to get hash length");
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return -1;
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}
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if (*result_len == 0) {
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*result_len = ret;
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*result = g_new(uint8_t, *result_len);
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} else if (*result_len != 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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*result_len, ret);
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return -1;
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}
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/* Digest is freed by gcry_md_close(), copy it */
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digest = gcry_md_read(*ctx, 0);
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memcpy(*result, digest, *result_len);
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return 0;
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}
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QCryptoHashDriver qcrypto_hash_lib_driver = {
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.hash_new = qcrypto_gcrypt_hash_new,
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.hash_update = qcrypto_gcrypt_hash_update,
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.hash_finalize = qcrypto_gcrypt_hash_finalize,
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.hash_free = qcrypto_gcrypt_hash_free,
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};
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