First Commit

externals/cryptopp/3way.cpp

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+// 3way.cpp - modified by Wei Dai from Joan Daemen's 3way.c
+// The original code and all modifications are in the public domain.
+
+#include "pch.h"
+#include "3way.h"
+#include "misc.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)
+void ThreeWay_TestInstantiations()
+{
+	ThreeWay::Encryption x1;
+	ThreeWay::Decryption x2;
+}
+#endif
+
+namespace
+{
+	const word32 START_E = 0x0b0b; // round constant of first encryption round
+	const word32 START_D = 0xb1b1; // round constant of first decryption round
+}
+
+static inline word32 reverseBits(word32 a)
+{
+	a = ((a & 0xAAAAAAAA) >> 1) | ((a & 0x55555555) << 1);
+	a = ((a & 0xCCCCCCCC) >> 2) | ((a & 0x33333333) << 2);
+	return ((a & 0xF0F0F0F0) >> 4) | ((a & 0x0F0F0F0F) << 4);
+}
+
+#define mu(a0, a1, a2)				\
+{									\
+	a1 = reverseBits(a1);			\
+	word32 t = reverseBits(a0);		\
+	a0 = reverseBits(a2);			\
+	a2 = t;							\
+}
+
+#define pi_gamma_pi(a0, a1, a2)   \
+{                                 \
+	word32 b0, b2;                          \
+	b2 = rotlConstant<1>(a2);               \
+	b0 = rotlConstant<22>(a0);				\
+	a0 = rotlConstant<1>(b0 ^ (a1|(~b2)));	\
+	a2 = rotlConstant<22>(b2 ^ (b0|(~a1))); \
+	a1 ^= (b2|(~b0));                       \
+}
+
+// thanks to Paulo Barreto for this optimized theta()
+#define theta(a0, a1, a2)									\
+{ 															\
+	word32 b0, b1, c; 										\
+	c = a0 ^ a1 ^ a2; 										\
+	c = rotlConstant<16>(c) ^ rotlConstant<8>(c);			\
+	b0 = (a0 << 24) ^ (a2 >> 8) ^ (a1 << 8) ^ (a0 >> 24); 	\
+	b1 = (a1 << 24) ^ (a0 >> 8) ^ (a2 << 8) ^ (a1 >> 24); 	\
+	a0 ^= c ^ b0; 											\
+	a1 ^= c ^ b1; 											\
+	a2 ^= c ^ (b0 >> 16) ^ (b1 << 16); 						\
+}
+
+#define rho(a0, a1, a2)			\
+{								\
+	theta(a0, a1, a2);			\
+	pi_gamma_pi(a0, a1, a2);	\
+}
+
+void ThreeWay::Base::UncheckedSetKey(const byte *uk, unsigned int length, const NameValuePairs &params)
+{
+	AssertValidKeyLength(length);
+
+	m_rounds = GetRoundsAndThrowIfInvalid(params, this);
+
+	for (unsigned int i=0; i<3; i++)
+		m_k[i] = (word32)uk[4*i+3] | ((word32)uk[4*i+2]<<8) | ((word32)uk[4*i+1]<<16) | ((word32)uk[4*i]<<24);
+
+	if (!IsForwardTransformation())
+	{
+		theta(m_k[0], m_k[1], m_k[2]);
+		mu(m_k[0], m_k[1], m_k[2]);
+		m_k[0] = ByteReverse(m_k[0]);
+		m_k[1] = ByteReverse(m_k[1]);
+		m_k[2] = ByteReverse(m_k[2]);
+	}
+}
+
+void ThreeWay::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	typedef BlockGetAndPut<word32, BigEndian> Block;
+
+	word32 a0, a1, a2;
+	Block::Get(inBlock)(a0)(a1)(a2);
+
+	word32 rc = START_E;
+
+	for(unsigned i=0; i<m_rounds; i++)
+	{
+		a0 ^= m_k[0] ^ (rc<<16);
+		a1 ^= m_k[1];
+		a2 ^= m_k[2] ^ rc;
+		rho(a0, a1, a2);
+
+		rc <<= 1;
+		if (rc&0x10000) rc ^= 0x11011;
+	}
+	a0 ^= m_k[0] ^ (rc<<16);
+	a1 ^= m_k[1];
+	a2 ^= m_k[2] ^ rc;
+	theta(a0, a1, a2);
+
+	Block::Put(xorBlock, outBlock)(a0)(a1)(a2);
+}
+
+void ThreeWay::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	typedef BlockGetAndPut<word32, LittleEndian> Block;
+
+	word32 a0, a1, a2;
+	Block::Get(inBlock)(a0)(a1)(a2);
+
+	word32 rc = START_D;
+
+	mu(a0, a1, a2);
+	for(unsigned i=0; i<m_rounds; i++)
+	{
+		a0 ^= m_k[0] ^ (rc<<16);
+		a1 ^= m_k[1];
+		a2 ^= m_k[2] ^ rc;
+		rho(a0, a1, a2);
+
+		rc <<= 1;
+		if (rc&0x10000) rc ^= 0x11011;
+	}
+	a0 ^= m_k[0] ^ (rc<<16);
+	a1 ^= m_k[1];
+	a2 ^= m_k[2] ^ rc;
+	theta(a0, a1, a2);
+	mu(a0, a1, a2);
+
+	Block::Put(xorBlock, outBlock)(a0)(a1)(a2);
+}
+
+NAMESPACE_END