- Renamed include directory to polarssl
diff --git a/library/arc4.c b/library/arc4.c
new file mode 100644
index 0000000..d226c07
--- /dev/null
+++ b/library/arc4.c
@@ -0,0 +1,158 @@
+/*
+ * An implementation of the ARCFOUR algorithm
+ *
+ * Copyright (C) 2006-2007 Christophe Devine
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+/*
+ * The ARCFOUR algorithm was publicly disclosed on 94/09.
+ *
+ * http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0
+ */
+
+#include "xyssl/config.h"
+
+#if defined(XYSSL_ARC4_C)
+
+#include "xyssl/arc4.h"
+
+/*
+ * ARC4 key schedule
+ */
+void arc4_setup( arc4_context *ctx, unsigned char *key, int keylen )
+{
+ int i, j, k, a;
+ unsigned char *m;
+
+ ctx->x = 0;
+ ctx->y = 0;
+ m = ctx->m;
+
+ for( i = 0; i < 256; i++ )
+ m[i] = (unsigned char) i;
+
+ j = k = 0;
+
+ for( i = 0; i < 256; i++, k++ )
+ {
+ if( k >= keylen ) k = 0;
+
+ a = m[i];
+ j = ( j + a + key[k] ) & 0xFF;
+ m[i] = m[j];
+ m[j] = (unsigned char) a;
+ }
+}
+
+/*
+ * ARC4 cipher function
+ */
+void arc4_crypt( arc4_context *ctx, unsigned char *buf, int buflen )
+{
+ int i, x, y, a, b;
+ unsigned char *m;
+
+ x = ctx->x;
+ y = ctx->y;
+ m = ctx->m;
+
+ for( i = 0; i < buflen; i++ )
+ {
+ x = ( x + 1 ) & 0xFF; a = m[x];
+ y = ( y + a ) & 0xFF; b = m[y];
+
+ m[x] = (unsigned char) b;
+ m[y] = (unsigned char) a;
+
+ buf[i] = (unsigned char)
+ ( buf[i] ^ m[(unsigned char)( a + b )] );
+ }
+
+ ctx->x = x;
+ ctx->y = y;
+}
+
+#if defined(XYSSL_SELF_TEST)
+
+#include <string.h>
+#include <stdio.h>
+
+/*
+ * ARC4 tests vectors as posted by Eric Rescorla in sep. 1994:
+ *
+ * http://groups.google.com/group/comp.security.misc/msg/10a300c9d21afca0
+ */
+static const unsigned char arc4_test_key[3][8] =
+{
+ { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
+ { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
+};
+
+static const unsigned char arc4_test_pt[3][8] =
+{
+ { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
+};
+
+static const unsigned char arc4_test_ct[3][8] =
+{
+ { 0x75, 0xB7, 0x87, 0x80, 0x99, 0xE0, 0xC5, 0x96 },
+ { 0x74, 0x94, 0xC2, 0xE7, 0x10, 0x4B, 0x08, 0x79 },
+ { 0xDE, 0x18, 0x89, 0x41, 0xA3, 0x37, 0x5D, 0x3A }
+};
+
+/*
+ * Checkup routine
+ */
+int arc4_self_test( int verbose )
+{
+ int i;
+ unsigned char buf[8];
+ arc4_context ctx;
+
+ for( i = 0; i < 3; i++ )
+ {
+ if( verbose != 0 )
+ printf( " ARC4 test #%d: ", i + 1 );
+
+ memcpy( buf, arc4_test_pt[i], 8 );
+
+ arc4_setup( &ctx, (unsigned char *) arc4_test_key[i], 8 );
+ arc4_crypt( &ctx, buf, 8 );
+
+ if( memcmp( buf, arc4_test_ct[i], 8 ) != 0 )
+ {
+ if( verbose != 0 )
+ printf( "failed\n" );
+
+ return( 1 );
+ }
+
+ if( verbose != 0 )
+ printf( "passed\n" );
+ }
+
+ if( verbose != 0 )
+ printf( "\n" );
+
+ return( 0 );
+}
+
+#endif
+
+#endif