From 62e99837e8277290e90f93ee615aa5d711645822 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Sun, 27 Nov 2016 15:31:50 -0500
Subject: Add Poly1305 class (Issue 338)

---
 poly1305.h | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 poly1305.h

(limited to 'poly1305.h')

diff --git a/poly1305.h b/poly1305.h
new file mode 100644
index 00000000..d848ed2d
--- /dev/null
+++ b/poly1305.h
@@ -0,0 +1,102 @@
+// poly1305.h - written and placed in the public domain by Jeffrey Walton and Jean-Pierre Munch
+//              Based on Andy Polyakov's 32-bit OpenSSL implementation using scalar multiplication.
+//              Copyright assigned to the Crypto++ project
+
+//! \file poly1305.h
+//! \brief Classes for Poly1305 message authentication code
+//! \sa Daniel J. Bernstein <A HREF="http://cr.yp.to/mac/poly1305-20050329.pdf">The Poly1305-AES
+//!   Message-Authentication Code (20050329)</A> and Andy Polyakov <A
+//!   HREF="http://www.openssl.org/blog/blog/2016/02/15/poly1305-revised/">Poly1305 Revised</A>
+//! \since Crypto++ 5.7
+
+#ifndef CRYPTOPP_POLY1305_H
+#define CRYPTOPP_POLY1305_H
+
+#include "cryptlib.h"
+#include "seckey.h"
+#include "secblock.h"
+#include "argnames.h"
+#include "algparam.h"
+
+
+#include "files.h"
+#include "filters.h"
+#include "hex.h"
+#include <iostream>
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! \class Poly1305_Base
+//! \brief Poly1305 message authentication code base class
+//! \tparam T class derived from BlockCipherDocumentation with 16-byte key and 16-byte blocksize
+//! \since Crypto++ 5.7
+template <class T>
+class CRYPTOPP_NO_VTABLE Poly1305_Base : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 16>, public MessageAuthenticationCode
+{
+	CRYPTOPP_COMPILE_ASSERT(T::DEFAULT_KEYLENGTH == 16);
+	CRYPTOPP_COMPILE_ASSERT(T::BLOCKSIZE == 16);
+
+public:
+	static std::string StaticAlgorithmName() {return std::string("Poly1305(") + T::StaticAlgorithmName() + ")";}
+
+	CRYPTOPP_CONSTANT(DIGESTSIZE=T::BLOCKSIZE)
+	CRYPTOPP_CONSTANT(BLOCKSIZE=T::BLOCKSIZE)
+
+	Poly1305_Base() : m_used(true) {}
+
+	void Resynchronize (const byte *iv, int ivLength=-1);
+	void GetNextIV (RandomNumberGenerator &rng, byte *iv);
+
+	void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);
+	void Update(const byte *input, size_t length);
+	void TruncatedFinal(byte *mac, size_t size);
+	void Restart();
+
+	unsigned int BlockSize() const {return BLOCKSIZE;}
+	unsigned int DigestSize() const {return DIGESTSIZE;}
+
+protected:
+	void ProcessBlocks(const byte *input, size_t length, word32 padbit);
+	void ProcessFinal(byte *mac, size_t length);
+
+	CPP_TYPENAME T::Encryption m_cipher;
+
+	// Accumulated hash, clamped r-key, and encrypted nonce
+	FixedSizeAlignedSecBlock<word32, 5> m_h;
+	FixedSizeAlignedSecBlock<word32, 4> m_r;
+	FixedSizeAlignedSecBlock<word32, 4> m_n;
+
+	// Accumulated message bytes and index
+	FixedSizeAlignedSecBlock<byte, BLOCKSIZE> m_acc;
+	size_t m_idx;
+
+	// Track nonce reuse; assert in debug but continue
+	bool m_used;
+};
+
+//! \class Poly1305
+//! \brief Poly1305 message authentication code
+//! \tparam T class derived from BlockCipherDocumentation
+//! \sa Daniel J. Bernstein <A HREF="http://cr.yp.to/mac/poly1305-20050329.pdf">The Poly1305-AES
+//!   Message-Authentication Code (20050329)</A> and Andy Polyakov <A
+//!   HREF="http://www.openssl.org/blog/blog/2016/02/15/poly1305-revised/">Poly1305 Revised</A>
+//! \since Crypto++ 5.7
+template <class T>
+class Poly1305 : public MessageAuthenticationCodeFinal<Poly1305_Base<T> >
+{
+public:
+	CRYPTOPP_CONSTANT(DEFAULT_KEYLENGTH=Poly1305_Base<T>::DEFAULT_KEYLENGTH);
+
+	//! \brief Construct a Poly1305
+	Poly1305() {}
+
+	//! \brief Construct a Poly1305
+	//! \param key a byte array used to key the cipher
+	//! \param length the size of the byte array, in bytes
+	Poly1305(const byte *key, size_t keyLength=DEFAULT_KEYLENGTH, const byte *nonce=NULL, size_t nonceLength=0)
+		{this->SetKey(key, keyLength, MakeParameters(Name::IV(), ConstByteArrayParameter(nonce, nonceLength)));}
+};
+
+NAMESPACE_END
+
+#endif  // CRYPTOPP_POLY1305_H
-- 
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