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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::InitState(HashWordType *state)
{
state[0] = W64LIT(0x0123456789ABCDEF);
state[1] = W64LIT(0xFEDCBA9876543210);
state[2] = W64LIT(0xF096A5B4C3B2E187);
}
void Tiger::TruncatedFinal(byte *hash, size_t 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];
memset(Y, 0, sizeof(Y));
}
NAMESPACE_END
#endif // WORD64_AVAILABLE
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