1 files changed, 57 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/stream/rc4/rc4.h b/comm/third_party/botan/src/lib/stream/rc4/rc4.h
new file mode 100644
index 0000000000..eff3c568db
--- /dev/null
+++ b/comm/third_party/botan/src/lib/stream/rc4/rc4.h
@@ -0,0 +1,57 @@
+/*
+* RC4
+* (C) 1999-2008 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_RC4_H_
+#define BOTAN_RC4_H_
+
+#include <botan/stream_cipher.h>
+#include <botan/types.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(rc4.h)
+
+namespace Botan {
+
+/**
+* RC4 stream cipher
+*/
+class BOTAN_PUBLIC_API(2,0) RC4 final : public StreamCipher
+   {
+   public:
+      void cipher(const uint8_t in[], uint8_t out[], size_t length) override;
+
+      void set_iv(const uint8_t iv[], size_t iv_len) override;
+
+      void clear() override;
+      std::string name() const override;
+
+      StreamCipher* clone() const override;
+
+      Key_Length_Specification key_spec() const override;
+
+      /**
+      * @param skip skip this many initial bytes in the keystream
+      */
+      explicit RC4(size_t skip = 0);
+
+      ~RC4() { clear(); }
+
+      void seek(uint64_t offset) override;
+   private:
+      void key_schedule(const uint8_t[], size_t) override;
+      void generate();
+
+      const size_t m_SKIP;
+      uint8_t m_X = 0;
+      uint8_t m_Y = 0;
+      secure_vector<uint8_t> m_state;
+      secure_vector<uint8_t> m_buffer;
+      size_t m_position = 0;
+   };
+
+}
+
+#endif