140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
// 3way.cpp - modifed 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)
|
|
|
|
void ThreeWay_TestInstantiations()
|
|
{
|
|
ThreeWay::Encryption x1;
|
|
ThreeWay::Decryption x2;
|
|
}
|
|
|
|
static const word32 START_E = 0x0b0b; // round constant of first encryption round
|
|
static const word32 START_D = 0xb1b1; // round constant of first decryption round
|
|
static const word32 RC_MODULUS = 0x11011;
|
|
|
|
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 = rotlFixed(a2, 1U); \
|
|
b0 = rotlFixed(a0, 22U); \
|
|
a0 = rotlFixed(b0 ^ (a1|(~b2)), 1U); \
|
|
a2 = rotlFixed(b2 ^ (b0|(~a1)), 22U);\
|
|
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 = rotlFixed(c, 16U) ^ rotlFixed(c, 8U); \
|
|
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 ¶ms)
|
|
{
|
|
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
|