Initial revision

1 files changed, 95 insertions, 0 deletions

diff --git a/tiger.cpp b/tiger.cpp
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+++ b/tiger.cpp
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+// tiger.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "tiger.h"
+#include "misc.h"
+
+#ifdef WORD64_AVAILABLE
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void Tiger::Init()
+{
+	m_digest[0] = W64LIT(0x0123456789ABCDEF);
+	m_digest[1] = W64LIT(0xFEDCBA9876543210);
+	m_digest[2] = W64LIT(0xF096A5B4C3B2E187);
+}
+
+void Tiger::TruncatedFinal(byte *hash, unsigned int size)
+{
+	ThrowIfInvalidTruncatedSize(size);
+
+	PadLastBlock(56, 0x01);
+	CorrectEndianess(m_data, m_data, 56);
+
+	m_data[7] = GetBitCountLo();
+
+	Transform(m_digest, m_data);
+	CorrectEndianess(m_digest, m_digest, DigestSize());
+	memcpy(hash, m_digest, size);
+
+	Restart();		// reinit for next use
+}
+
+#define t1 (table)
+#define t2 (table+256)
+#define t3 (table+256*2)
+#define t4 (table+256*3)
+
+#define round(a,b,c,x,mul) \
+	c ^= x; \
+	a -= t1[GETBYTE(c,0)] ^ t2[GETBYTE(c,2)] ^ t3[GETBYTE(c,4)] ^ t4[GETBYTE(c,6)]; \
+	b += t4[GETBYTE(c,1)] ^ t3[GETBYTE(c,3)] ^ t2[GETBYTE(c,5)] ^ t1[GETBYTE(c,7)]; \
+	b *= mul
+
+#define pass(a,b,c,mul,X) \
+	round(a,b,c,X[0],mul); \
+	round(b,c,a,X[1],mul); \
+	round(c,a,b,X[2],mul); \
+	round(a,b,c,X[3],mul); \
+	round(b,c,a,X[4],mul); \
+	round(c,a,b,X[5],mul); \
+	round(a,b,c,X[6],mul); \
+	round(b,c,a,X[7],mul)
+
+#define key_schedule(Y,X) \
+	Y[0] = X[0] - (X[7]^W64LIT(0xA5A5A5A5A5A5A5A5)); \
+	Y[1] = X[1] ^ Y[0]; \
+	Y[2] = X[2] + Y[1]; \
+	Y[3] = X[3] - (Y[2] ^ ((~Y[1])<<19)); \
+	Y[4] = X[4] ^ Y[3]; \
+	Y[5] = X[5] + Y[4]; \
+	Y[6] = X[6] - (Y[5] ^ ((~Y[4])>>23)); \
+	Y[7] = X[7] ^ Y[6]; \
+	Y[0] += Y[7]; \
+	Y[1] -= Y[0] ^ ((~Y[7])<<19); \
+	Y[2] ^= Y[1]; \
+	Y[3] += Y[2]; \
+	Y[4] -= Y[3] ^ ((~Y[2])>>23); \
+	Y[5] ^= Y[4]; \
+	Y[6] += Y[5]; \
+	Y[7] -= Y[6] ^ W64LIT(0x0123456789ABCDEF)
+
+void Tiger::Transform (word64 *digest, const word64 *X)
+{
+	word64 a = digest[0];
+	word64 b = digest[1];
+	word64 c = digest[2];
+	word64 Y[8];
+
+	pass(a,b,c,5,X);
+	key_schedule(Y,X);
+	pass(c,a,b,7,Y);
+	key_schedule(Y,Y);
+	pass(b,c,a,9,Y);
+
+	digest[0] = a ^ digest[0];
+	digest[1] = b - digest[1];
+	digest[2] = c + digest[2];
+
+	Y[0] = Y[1] = Y[2] = Y[3] = Y[4] = Y[5] = Y[6] = Y[7] = 0;
+}
+
+NAMESPACE_END
+
+#endif	// WORD64_AVAILABLE