1 files changed, 49 insertions, 0 deletions
diff --git a/src/lib/stream/chacha/chacha.h b/src/lib/stream/chacha/chacha.h
new file mode 100644
index 000000000..b7d720685
--- /dev/null
+++ b/src/lib/stream/chacha/chacha.h
@@ -0,0 +1,49 @@
+/*
+* ChaCha20
+* (C) 2014 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_CHACHA_H__
+#define BOTAN_CHACHA_H__
+
+#include <botan/stream_cipher.h>
+
+namespace Botan {
+
+/**
+* DJB's ChaCha (http://cr.yp.to/chacha.html)
+*/
+class BOTAN_DLL ChaCha : public StreamCipher
+   {
+   public:
+      void cipher(const byte in[], byte out[], size_t length);
+
+      void set_iv(const byte iv[], size_t iv_len);
+
+      bool valid_iv_length(size_t iv_len) const
+         { return (iv_len == 8); }
+
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(16, 32, 16);
+         }
+
+      void clear();
+      std::string name() const;
+
+      StreamCipher* clone() const { return new ChaCha; }
+   protected:
+      virtual void chacha(byte output[64], const u32bit input[16]);
+   private:
+      void key_schedule(const byte key[], size_t key_len);
+
+      secure_vector<u32bit> m_state;
+      secure_vector<byte> m_buffer;
+      size_t m_position = 0;
+   };
+
+}
+
+#endif