add new algorithms (Kevin Springle)

1 files changed, 38 insertions, 0 deletions

diff --git a/ttmac.h b/ttmac.h
new file mode 100644
index 00000000..7ca7ecfa
--- /dev/null
+++ b/ttmac.h
@@ -0,0 +1,38 @@
+// ttmac.h - written and placed in the public domain by Kevin Springle
+
+#ifndef CRYPTOPP_TTMAC_H
+#define CRYPTOPP_TTMAC_H
+
+#include "seckey.h"
+#include "iterhash.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+//! <a href="http://www.eskimo.com/~weidai/scan-mirror/mac.html#Two-Track-MAC">Two-Track-MAC</a>
+/*! 160 Bit MAC with 160 Bit Key */
+
+class TTMAC_Base : public FixedKeyLength<20>, public IteratedHash<word32, LittleEndian, 64, MessageAuthenticationCode>
+{
+public:
+	static std::string StaticAlgorithmName() {return std::string("Two-Track-MAC");}
+	enum {DIGESTSIZE=20};
+
+	TTMAC_Base() : IteratedHash<word32, LittleEndian, 64, MessageAuthenticationCode>(DIGESTSIZE*2) {}
+
+	unsigned int DigestSize() const {return DIGESTSIZE;};
+	void UncheckedSetKey(const byte *userKey, unsigned int keylength);
+	void TruncatedFinal(byte *mac, unsigned int size);
+
+protected:
+	static void Transform (word32 *digest, const word32 *X, bool last);
+	void vTransform(const word32 *data) {Transform(m_digest, data, false);}
+	void Init();
+
+	FixedSizeSecBlock<word32, DIGESTSIZE> m_key;
+};
+
+//! <a href="http://www.weidai.com/scan-mirror/mac.html#TTMAC">Two-Track-MAC</a>
+typedef MessageAuthenticationCodeTemplate<TTMAC_Base> TTMAC;
+
+NAMESPACE_END
+
+#endif