1 files changed, 46 insertions, 0 deletions
diff --git a/lib/stream/salsa20/salsa20.h b/lib/stream/salsa20/salsa20.h
new file mode 100644
index 000000000..b68bb979e
--- /dev/null
+++ b/lib/stream/salsa20/salsa20.h
@@ -0,0 +1,46 @@
+/*
+* Salsa20 / XSalsa20
+* (C) 1999-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_SALSA20_H__
+#define BOTAN_SALSA20_H__
+
+#include <botan/stream_cipher.h>
+
+namespace Botan {
+
+/**
+* DJB's Salsa20 (and XSalsa20)
+*/
+class BOTAN_DLL Salsa20 : 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 || iv_len == 24); }
+
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(16, 32, 16);
+         }
+
+      void clear();
+      std::string name() const;
+      StreamCipher* clone() const { return new Salsa20; }
+   private:
+      void key_schedule(const byte key[], size_t key_len);
+
+      secure_vector<u32bit> state;
+      secure_vector<byte> buffer;
+      size_t position;
+   };
+
+}
+
+#endif