1/*
2 * QEMU Crypto initialization
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21#include "qemu/osdep.h"
22#include "crypto/init.h"
23#include "qapi/error.h"
24#include "qemu/thread.h"
25
26#ifdef CONFIG_GNUTLS
27#include <gnutls/gnutls.h>
28#include <gnutls/crypto.h>
29#endif
30
31#ifdef CONFIG_GCRYPT
32#include <gcrypt.h>
33#endif
34
35#include "crypto/random.h"
36
37/* #define DEBUG_GNUTLS */
38
39/*
40 * We need to init gcrypt threading if
41 *
42 * - gcrypt < 1.6.0
43 *
44 */
45
46#if (defined(CONFIG_GCRYPT) && \
47 (GCRYPT_VERSION_NUMBER < 0x010600))
48#define QCRYPTO_INIT_GCRYPT_THREADS
49#else
50#undef QCRYPTO_INIT_GCRYPT_THREADS
51#endif
52
53#ifdef DEBUG_GNUTLS
54static void qcrypto_gnutls_log(int level, const char *str)
55{
56 fprintf(stderr, "%d: %s", level, str);
57}
58#endif
59
60#ifdef QCRYPTO_INIT_GCRYPT_THREADS
61static int qcrypto_gcrypt_mutex_init(void **priv)
62{ \
63 QemuMutex *lock = NULL;
64 lock = g_new0(QemuMutex, 1);
65 qemu_mutex_init(lock);
66 *priv = lock;
67 return 0;
68}
69
70static int qcrypto_gcrypt_mutex_destroy(void **priv)
71{
72 QemuMutex *lock = *priv;
73 qemu_mutex_destroy(lock);
74 g_free(lock);
75 return 0;
76}
77
78static int qcrypto_gcrypt_mutex_lock(void **priv)
79{
80 QemuMutex *lock = *priv;
81 qemu_mutex_lock(lock);
82 return 0;
83}
84
85static int qcrypto_gcrypt_mutex_unlock(void **priv)
86{
87 QemuMutex *lock = *priv;
88 qemu_mutex_unlock(lock);
89 return 0;
90}
91
92static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = {
93 (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)),
94 NULL,
95 qcrypto_gcrypt_mutex_init,
96 qcrypto_gcrypt_mutex_destroy,
97 qcrypto_gcrypt_mutex_lock,
98 qcrypto_gcrypt_mutex_unlock,
99 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
100};
101#endif /* QCRYPTO_INIT_GCRYPT */
102
103int qcrypto_init(Error **errp)
104{
105#ifdef QCRYPTO_INIT_GCRYPT_THREADS
106 gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl);
107#endif /* QCRYPTO_INIT_GCRYPT_THREADS */
108
109#ifdef CONFIG_GNUTLS
110 int ret;
111 ret = gnutls_global_init();
112 if (ret < 0) {
113 error_setg(errp,
114 "Unable to initialize GNUTLS library: %s",
115 gnutls_strerror(ret));
116 return -1;
117 }
118#ifdef DEBUG_GNUTLS
119 gnutls_global_set_log_level(10);
120 gnutls_global_set_log_function(qcrypto_gnutls_log);
121#endif
122#endif
123
124#ifdef CONFIG_GCRYPT
125 if (!gcry_check_version(GCRYPT_VERSION)) {
126 error_setg(errp, "Unable to initialize gcrypt");
127 return -1;
128 }
129 gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
130#endif
131
132 if (qcrypto_random_init(errp) < 0) {
133 return -1;
134 }
135
136 return 0;
137}
138