1 files changed, 83 insertions, 0 deletions
diff --git a/lib/nettle/sysrng-bcrypt.c b/lib/nettle/sysrng-bcrypt.c
new file mode 100644
index 0000000..a08e9de
--- /dev/null
+++ b/lib/nettle/sysrng-bcrypt.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2010-2016 Free Software Foundation, Inc.
+ * Copyright (C) 2015-2016 Red Hat, Inc.
+ * Copyright (C) 2000, 2001, 2008 Niels Möller
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GNUTLS.
+ *
+ * The GNUTLS 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 2.1 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 program.  If not, see <https://www.gnu.org/licenses/>
+ *
+ */
+
+/* Here are the common parts of the random generator layer. 
+ * Some of this code was based on the LSH 
+ * random generator (the trivia and device source functions for POSIX)
+ * and modified to fit gnutls' needs. Relicenced with permission. 
+ * Original author Niels Möller.
+ */
+
+#include "gnutls_int.h"
+#include "errors.h"
+#include <locks.h>
+#include <num.h>
+#include <nettle/yarrow.h>
+#include <errno.h>
+#include <rnd-common.h>
+#include <hash-pjw-bare.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+/* The windows randomness gatherer.
+ */
+
+#include <windows.h>
+#include <bcrypt.h>
+
+get_entropy_func _rnd_get_system_entropy = NULL;
+
+static BCRYPT_ALG_HANDLE device_fd = 0;
+
+static
+int _rnd_get_system_entropy_win32(void* rnd, size_t size)
+{
+	NTSTATUS err = BCryptGenRandom(device_fd, rnd, size, 0);
+	if (!BCRYPT_SUCCESS(err)) {
+		_gnutls_debug_log("Error in BCryptGenRandom: %ld\n", err);
+		return GNUTLS_E_RANDOM_DEVICE_ERROR;
+	}
+
+	return 0;
+}
+
+int _rnd_system_entropy_init(void)
+{
+	NTSTATUS err = BCryptOpenAlgorithmProvider
+	    (&device_fd, BCRYPT_RNG_ALGORITHM, NULL, 0);
+	if (!BCRYPT_SUCCESS(err)) {
+		_gnutls_debug_log("error in BCryptOpenAlgorithmProvider!\n");
+		return GNUTLS_E_RANDOM_DEVICE_ERROR;
+	}
+
+	_rnd_get_system_entropy = _rnd_get_system_entropy_win32;
+	return 0;
+}
+
+void _rnd_system_entropy_deinit(void)
+{
+	BCryptCloseAlgorithmProvider(device_fd, 0);
+}