/* * 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 <gcrypt.h> #include "qapi/error.h" #include "crypto/hash.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_SHA224] = GCRY_MD_SHA224, [QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256, [QCRYPTO_HASH_ALG_SHA384] = GCRY_MD_SHA384, [QCRYPTO_HASH_ALG_SHA512] = GCRY_MD_SHA512, [QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MD_RMD160, }; 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 (!qcrypto_hash_supports(alg)) { 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; }