Initial implementation of the FHMQV-C handshake

1 files changed, 61 insertions, 0 deletions

diff --git a/src/random.c b/src/random.c
new file mode 100644
index 0000000..0681d77
--- /dev/null
+++ b/src/random.c
@@ -0,0 +1,61 @@
+/*
+  Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net>
+  Partly based on QuickTun Copyright (c) 2010, Ivo Smits <Ivo@UCIS.nl>.
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include "fastd.h"
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+
+void fastd_random_bytes(fastd_context *ctx, void *buffer, size_t len, bool secure) {
+	int fd;
+	size_t read_bytes = 0;
+
+	if (secure)
+		fd = open("/dev/random", O_RDONLY);
+	else
+		fd = open("/dev/urandom", O_RDONLY);
+
+	if (fd < 0)
+		exit_errno(ctx, "unable to open random device");
+
+	while (read_bytes < len) {
+		ssize_t ret = read(fd, ((char*)buffer)+read_bytes, len-read_bytes);
+
+		if (ret < 0) {
+			if (errno == EINTR)
+				continue;
+
+			exit_errno(ctx, "unable to read from random device");
+		}
+
+		read_bytes += ret;
+	}
+
+	close(fd);
+}