xref: /openbmc/qemu/crypto/hash-glib.c (revision 700784bf)
1 /*
2  * QEMU Crypto hash algorithms
3  *
4  * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
5  * Copyright (c) 2016 Red Hat, Inc.
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19  *
20  */
21 
22 #include "qemu/osdep.h"
23 #include "qapi/error.h"
24 #include "crypto/hash.h"
25 #include "hashpriv.h"
26 
27 
28 static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = {
29     [QCRYPTO_HASH_ALGO_MD5] = G_CHECKSUM_MD5,
30     [QCRYPTO_HASH_ALGO_SHA1] = G_CHECKSUM_SHA1,
31     [QCRYPTO_HASH_ALGO_SHA224] = -1,
32     [QCRYPTO_HASH_ALGO_SHA256] = G_CHECKSUM_SHA256,
33     [QCRYPTO_HASH_ALGO_SHA384] = G_CHECKSUM_SHA384,
34     [QCRYPTO_HASH_ALGO_SHA512] = G_CHECKSUM_SHA512,
35     [QCRYPTO_HASH_ALGO_RIPEMD160] = -1,
36 };
37 
38 gboolean qcrypto_hash_supports(QCryptoHashAlgo alg)
39 {
40     if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
41         qcrypto_hash_alg_map[alg] != -1) {
42         return true;
43     }
44     return false;
45 }
46 
47 static
48 QCryptoHash *qcrypto_glib_hash_new(QCryptoHashAlgo alg,
49                                    Error **errp)
50 {
51     QCryptoHash *hash;
52 
53     hash = g_new(QCryptoHash, 1);
54     hash->alg = alg;
55     hash->opaque = g_checksum_new(qcrypto_hash_alg_map[alg]);
56 
57     return hash;
58 }
59 
60 static
61 void qcrypto_glib_hash_free(QCryptoHash *hash)
62 {
63     if (hash->opaque) {
64         g_checksum_free(hash->opaque);
65     }
66 
67     g_free(hash);
68 }
69 
70 
71 static
72 int qcrypto_glib_hash_update(QCryptoHash *hash,
73                              const struct iovec *iov,
74                              size_t niov,
75                              Error **errp)
76 {
77     GChecksum *ctx = hash->opaque;
78 
79     for (int i = 0; i < niov; i++) {
80         g_checksum_update(ctx, iov[i].iov_base, iov[i].iov_len);
81     }
82 
83     return 0;
84 }
85 
86 static
87 int qcrypto_glib_hash_finalize(QCryptoHash *hash,
88                                uint8_t **result,
89                                size_t *result_len,
90                                Error **errp)
91 {
92     int ret;
93     GChecksum *ctx = hash->opaque;
94 
95     ret = g_checksum_type_get_length(qcrypto_hash_alg_map[hash->alg]);
96     if (ret < 0) {
97         error_setg(errp, "Unable to get hash length");
98         *result_len = 0;
99         return -1;
100     }
101 
102     if (*result_len == 0) {
103         *result_len = ret;
104         *result = g_new(uint8_t, *result_len);
105     } else if (*result_len != ret) {
106         error_setg(errp,
107                    "Result buffer size %zu is smaller than hash %d",
108                    *result_len, ret);
109         return -1;
110     }
111 
112     g_checksum_get_digest(ctx, *result, result_len);
113     return 0;
114 }
115 
116 QCryptoHashDriver qcrypto_hash_lib_driver = {
117     .hash_new      = qcrypto_glib_hash_new,
118     .hash_update   = qcrypto_glib_hash_update,
119     .hash_finalize = qcrypto_glib_hash_finalize,
120     .hash_free     = qcrypto_glib_hash_free,
121 };
122