Add implementation of Salsa20 stream cipher

1 files changed, 39 insertions, 0 deletions

diff --git a/include/salsa20.h b/include/salsa20.h
new file mode 100644
index 000000000..e107d8569
--- /dev/null
+++ b/include/salsa20.h
@@ -0,0 +1,39 @@
+/*************************************************
+* Salsa20 Header File                            *
+* (C) 1999-2008 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_SALSA20_H__
+#define BOTAN_SALSA20_H__
+
+#include <botan/base.h>
+
+namespace Botan {
+
+/*************************************************
+* Salsa20                                        *
+*************************************************/
+class BOTAN_DLL Salsa20 : public StreamCipher
+   {
+   public:
+      void clear() throw();
+      std::string name() const;
+      StreamCipher* clone() const { return new Salsa20; }
+
+      void resync(const byte[], u32bit);
+
+      Salsa20();
+      ~Salsa20() { clear(); }
+   private:
+      void cipher(const byte[], byte[], u32bit);
+      void key(const byte[], u32bit);
+
+      SecureBuffer<u32bit, 16> state;
+
+      SecureBuffer<byte, 64> buffer;
+      u32bit position;
+   };
+
+}
+
+#endif