wpa_supplicant: Initial Revision 0.8.X
Based on:
commit 0725cc7b7efc434910e89865c42eda7ce61bbf08
Author: Jouni Malinen <j@w1.fi>
Date: Thu Apr 21 20:41:01 2011 +0300
Enable CONFIG_DRIVER_NL80211=y in the default configuration
nl80211 should be preferred over WEXT with any recent Linux
kernel version.
Change-Id: I26aec5afbbd4f4a1f5fd900912545b6f5050de64
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/crypto/rc4.c b/src/crypto/rc4.c
new file mode 100644
index 0000000..5ab1be1
--- /dev/null
+++ b/src/crypto/rc4.c
@@ -0,0 +1,60 @@
+/*
+ * RC4 stream cipher
+ * Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "crypto.h"
+
+#define S_SWAP(a,b) do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0)
+
+int rc4_skip(const u8 *key, size_t keylen, size_t skip,
+ u8 *data, size_t data_len)
+{
+ u32 i, j, k;
+ u8 S[256], *pos;
+ size_t kpos;
+
+ /* Setup RC4 state */
+ for (i = 0; i < 256; i++)
+ S[i] = i;
+ j = 0;
+ kpos = 0;
+ for (i = 0; i < 256; i++) {
+ j = (j + S[i] + key[kpos]) & 0xff;
+ kpos++;
+ if (kpos >= keylen)
+ kpos = 0;
+ S_SWAP(i, j);
+ }
+
+ /* Skip the start of the stream */
+ i = j = 0;
+ for (k = 0; k < skip; k++) {
+ i = (i + 1) & 0xff;
+ j = (j + S[i]) & 0xff;
+ S_SWAP(i, j);
+ }
+
+ /* Apply RC4 to data */
+ pos = data;
+ for (k = 0; k < data_len; k++) {
+ i = (i + 1) & 0xff;
+ j = (j + S[i]) & 0xff;
+ S_SWAP(i, j);
+ *pos++ ^= S[(S[i] + S[j]) & 0xff];
+ }
+
+ return 0;
+}