From: Niels Möller <nisse@lysator.liu.se>
Date: Fri, 19 Sep 2003 11:56:04 +0000 (+0200)
Subject: New example program that generates
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6857a6b664cfb15f45f63f2dc5c5f04d3bb07875;p=thirdparty%2Fnettle.git

New example program that generates
pseudorandom output.

Rev: src/nettle/examples/.cvsignore:1.1.2.1
Rev: src/nettle/examples/lfib-stream.c:1.1.2.1
---

diff --git a/examples/.cvsignore b/examples/.cvsignore
index e2026661..0763fe85 100644
--- a/examples/.cvsignore
+++ b/examples/.cvsignore
@@ -1,4 +1,5 @@
 .deps
 Makefile
 Makefile.in
+lfib-stream
 nettle-benchmark
diff --git a/examples/.gitignore b/examples/.gitignore
index 5bfd2056..dca9d918 100644
--- a/examples/.gitignore
+++ b/examples/.gitignore
@@ -1,4 +1,5 @@
 /.deps
 /Makefile
 /Makefile.in
+/lfib-stream
 /nettle-benchmark
diff --git a/examples/lfib-stream.c b/examples/lfib-stream.c
new file mode 100644
index 00000000..83c8116d
--- /dev/null
+++ b/examples/lfib-stream.c
@@ -0,0 +1,81 @@
+/* lfib-stream.c
+ *
+ * Generates a pseudorandom stream, using the Knuth lfig
+ * (non-cryptographic) pseudorandom generator.
+ *
+ */
+ 
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2003 Niels Möller
+ *  
+ * The nettle 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.
+ * 
+ * The nettle 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 the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#include "knuth-lfib.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <time.h>
+
+#define BUFSIZE 500
+
+static void
+usage(void)
+{
+  fprintf(stderr, "Usage: lfib-stream [SEED]\n");
+}
+
+int
+main(int argc, char **argv)
+{
+  struct knuth_lfib_ctx ctx;
+  uint32_t seed;
+
+  if (argc == 1)
+    seed = time(NULL);
+
+  else if (argc == 2)
+    {
+      seed = atoi(argv[1]);
+      if (!seed)
+	{
+	  usage();
+	  return EXIT_FAILURE;
+	}
+    }
+  else
+    {
+      usage();
+      return EXIT_FAILURE;
+    }
+
+  knuth_lfib_init(&ctx, seed);
+
+  for (;;)
+    {
+      char buffer[BUFSIZE];
+      knuth_lfib_random(&ctx, BUFSIZE, buffer);
+
+      if (fwrite(buffer, 1, BUFSIZE, stdout) < BUFSIZE
+	  || fflush(stdout) < 0)
+	return EXIT_FAILURE;
+    }
+
+  /* Not reached. This program is usually terminated by SIGPIPE */
+}