| /* |
| * 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 "gcrypt.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 (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) || |
| qcrypto_hash_alg_map[alg] == GCRY_MD_NONE) { |
| 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; |
| } |