From f86be52ec2ba31a11b19ba831db56432c9df2155 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Thu, 5 Feb 2004 17:02:11 +0100
Subject: * configure.ac: Use assembler file arcfour-crypt.asm if available.

* arcfour.c (arcfour_crypt): Moved function too...
* arcfour-crypt.c (arcfour_crypt): New file.

Rev: src/nettle/Makefile.am:1.69
Rev: src/nettle/arcfour-crypt.c:1.1
Rev: src/nettle/arcfour.c:1.5
Rev: src/nettle/configure.ac:1.29
---
 arcfour-crypt.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 arcfour-crypt.c

(limited to 'arcfour-crypt.c')

diff --git a/arcfour-crypt.c b/arcfour-crypt.c
new file mode 100644
index 00000000..e3d678ff
--- /dev/null
+++ b/arcfour-crypt.c
@@ -0,0 +1,52 @@
+/* arcfour-crypt.c
+ *
+ * The arcfour/rc4 stream cipher.
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2001, 2004 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.
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+
+#include "arcfour.h"
+
+void
+arcfour_crypt(struct arcfour_ctx *ctx,
+	      unsigned length, uint8_t *dst,
+	      const uint8_t *src)
+{
+  register uint8_t i, j;
+  register int si, sj;
+
+  i = ctx->i; j = ctx->j;
+  while(length--)
+    {
+      i++; i &= 0xff;
+      si = ctx->S[i];
+      j += si; j &= 0xff;
+      sj = ctx->S[i] = ctx->S[j];
+      *dst++ = *src++ ^ ctx->S[ (si + sj) & 0xff ];
+    }
+  ctx->i = i; ctx->j = j;
+}
-- 
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