Renamed rc4 -> arcfour.

Rev: src/symmetric/Makefile.am.in:1.6
Rev: src/symmetric/arcfour.c:1.1
Rev: src/symmetric/include/arcfour.h:1.1
Rev: src/symmetric/include/rc4.h:1.5(DEAD)
Rev: src/symmetric/rc4.c:1.3(DEAD)

1 files changed, 49 insertions, 0 deletions

diff --git a/arcfour.c b/arcfour.c
new file mode 100644
index 00000000..4aeedc9d
--- /dev/null
+++ b/arcfour.c
@@ -0,0 +1,49 @@
+/* arcfour.c
+ *
+ */
+
+#include "crypto_types.h"
+#include <arcfour.h>
+
+#ifdef RCSID
+RCSID("$Id$");
+#endif
+
+#define SWAP(a,b) do { int _t = a; a = b; b = _t; } while(0)
+
+void arcfour_set_key(struct arcfour_ctx *ctx, const UINT8 *key, UINT32 len)
+{
+  register UINT8 j; /* Depends on the eight-bitness of these variables. */
+  unsigned i;
+  UINT32 k;
+
+  /* Initialize context */
+  i = 0;
+  do ctx->S[i] = i; while (++i < 256);
+
+  /* Expand key */
+  i = j = k = 0;
+  do {
+    j += ctx->S[i] + key[k];
+    SWAP(ctx->S[i], ctx->S[j]);
+    k = (k+1) % len; /* Repeat key if needed */
+  } while(++i < 256);
+  
+  ctx->i = ctx->j = 0;
+}
+
+void arcfour_crypt(struct arcfour_ctx *ctx, UINT8 *dest,
+		   const UINT8 *src, UINT32 len)
+{
+  register UINT8 i, j;
+
+  i = ctx->i; j = ctx->j;
+  while(len--)
+    {
+      i++; i &= 0xff;
+      j += ctx->S[i]; j &= 0xff;
+      SWAP(ctx->S[i], ctx->S[j]);
+      *dest++ = *src++ ^ ctx->S[ (ctx->S[i] + ctx->S[j]) & 0xff ];
+    }
+  ctx->i = i; ctx->j = j;
+}