1 files changed, 55 insertions, 0 deletions
diff --git a/src/lib/stream/rc4/rc4.h b/src/lib/stream/rc4/rc4.h
new file mode 100644
index 000000000..c23f8c853
--- /dev/null
+++ b/src/lib/stream/rc4/rc4.h
@@ -0,0 +1,55 @@
+/*
+* RC4
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_RC4_H__
+#define BOTAN_RC4_H__
+
+#include <botan/stream_cipher.h>
+#include <botan/types.h>
+
+namespace Botan {
+
+/**
+* RC4 stream cipher
+*/
+class BOTAN_DLL RC4 : public StreamCipher
+   {
+   public:
+      void cipher(const byte in[], byte out[], size_t length);
+
+      void clear();
+      std::string name() const;
+
+      StreamCipher* clone() const { return new RC4(SKIP); }
+
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(1, 256);
+         }
+
+      /**
+      * @param skip skip this many initial bytes in the keystream
+      */
+      RC4(size_t skip = 0);
+
+      ~RC4() { clear(); }
+   private:
+      void key_schedule(const byte[], size_t);
+      void generate();
+
+      const size_t SKIP;
+
+      byte X, Y;
+      secure_vector<byte> state;
+
+      secure_vector<byte> buffer;
+      size_t position;
+   };
+
+}
+
+#endif