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-rw-r--r--qemu/crypto/init.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/qemu/crypto/init.c b/qemu/crypto/init.c
new file mode 100644
index 000000000..7447882c7
--- /dev/null
+++ b/qemu/crypto/init.c
@@ -0,0 +1,150 @@
+/*
+ * QEMU Crypto initialization
+ *
+ * Copyright (c) 2015 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 "crypto/init.h"
+#include "qemu/thread.h"
+
+#ifdef CONFIG_GNUTLS
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+#ifdef CONFIG_GNUTLS_GCRYPT
+#include <gcrypt.h>
+#endif
+
+/* #define DEBUG_GNUTLS */
+
+/*
+ * If GNUTLS is built against GCrypt then
+ *
+ * - When GNUTLS >= 2.12, we must not initialize gcrypt threading
+ * because GNUTLS will do that itself
+ * - When GNUTLS < 2.12 we must always initialize gcrypt threading
+ *
+ * But....
+ *
+ * When gcrypt >= 1.6.0 we must not initialize gcrypt threading
+ * because gcrypt will do that itself.
+ *
+ * So we need to init gcrypt threading if
+ *
+ * - gcrypt < 1.6.0
+ * AND
+ * - gnutls < 2.12
+ *
+ */
+
+#if (defined(CONFIG_GNUTLS_GCRYPT) && \
+ (!defined(GNUTLS_VERSION_NUMBER) || \
+ (GNUTLS_VERSION_NUMBER < 0x020c00)) && \
+ (!defined(GCRYPT_VERSION_NUMBER) || \
+ (GCRYPT_VERSION_NUMBER < 0x010600)))
+#define QCRYPTO_INIT_GCRYPT_THREADS
+#else
+#undef QCRYPTO_INIT_GCRYPT_THREADS
+#endif
+
+#ifdef DEBUG_GNUTLS
+static void qcrypto_gnutls_log(int level, const char *str)
+{
+ fprintf(stderr, "%d: %s", level, str);
+}
+#endif
+
+#ifdef QCRYPTO_INIT_GCRYPT_THREADS
+static int qcrypto_gcrypt_mutex_init(void **priv)
+{ \
+ QemuMutex *lock = NULL;
+ lock = g_new0(QemuMutex, 1);
+ qemu_mutex_init(lock);
+ *priv = lock;
+ return 0;
+}
+
+static int qcrypto_gcrypt_mutex_destroy(void **priv)
+{
+ QemuMutex *lock = *priv;
+ qemu_mutex_destroy(lock);
+ g_free(lock);
+ return 0;
+}
+
+static int qcrypto_gcrypt_mutex_lock(void **priv)
+{
+ QemuMutex *lock = *priv;
+ qemu_mutex_lock(lock);
+ return 0;
+}
+
+static int qcrypto_gcrypt_mutex_unlock(void **priv)
+{
+ QemuMutex *lock = *priv;
+ qemu_mutex_unlock(lock);
+ return 0;
+}
+
+static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = {
+ (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)),
+ NULL,
+ qcrypto_gcrypt_mutex_init,
+ qcrypto_gcrypt_mutex_destroy,
+ qcrypto_gcrypt_mutex_lock,
+ qcrypto_gcrypt_mutex_unlock,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+#endif /* QCRYPTO_INIT_GCRYPT */
+
+int qcrypto_init(Error **errp)
+{
+ int ret;
+ ret = gnutls_global_init();
+ if (ret < 0) {
+ error_setg(errp,
+ "Unable to initialize GNUTLS library: %s",
+ gnutls_strerror(ret));
+ return -1;
+ }
+#ifdef DEBUG_GNUTLS
+ gnutls_global_set_log_level(10);
+ gnutls_global_set_log_function(qcrypto_gnutls_log);
+#endif
+
+#ifdef CONFIG_GNUTLS_GCRYPT
+ if (!gcry_check_version(GCRYPT_VERSION)) {
+ error_setg(errp, "Unable to initialize gcrypt");
+ return -1;
+ }
+#ifdef QCRYPTO_INIT_GCRYPT_THREADS
+ gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl);
+#endif /* QCRYPTO_INIT_GCRYPT_THREADS */
+ gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
+#endif
+
+ return 0;
+}
+
+#else /* ! CONFIG_GNUTLS */
+
+int qcrypto_init(Error **errp G_GNUC_UNUSED)
+{
+ return 0;
+}
+
+#endif /* ! CONFIG_GNUTLS */