Add Poly1305, based on poly1305-donna by Andrew Moon.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/lib/mac/poly1305/poly1305.h b/src/lib/mac/poly1305/poly1305.h
new file mode 100644
index 000000000..8334edb03
--- /dev/null
+++ b/src/lib/mac/poly1305/poly1305.h
@@ -0,0 +1,48 @@
+/*
+* Poly1305
+* (C) 2014 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_MAC_POLY1305_H__
+#define BOTAN_MAC_POLY1305_H__
+
+#include <botan/mac.h>
+#include <memory>
+
+namespace Botan {
+
+/**
+* DJB's Poly1305
+* Important note: each key can only be used once
+*/
+class BOTAN_DLL Poly1305 : public MessageAuthenticationCode
+   {
+   public:
+      std::string name() const override { return "Poly1305"; }
+
+      MessageAuthenticationCode* clone() const { return new Poly1305; }
+
+      void clear();
+
+      size_t output_length() const { return 16; }
+
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(32);
+         }
+
+   private:
+      void add_data(const byte[], size_t);
+      void final_result(byte[]);
+      void key_schedule(const byte[], size_t);
+
+      secure_vector<u64bit> m_poly;
+      secure_vector<byte> m_buf;
+      size_t m_buf_pos = 0;
+   };
+
+}
+
+#endif