void squareDecrypt (word32 text[4], squareKeySchedule roundKeys)
{
word32 temp[4];
/* initial key addition */
text[0] ^= roundKeys[0][0];
text[1] ^= roundKeys[0][1];
text[2] ^= roundKeys[0][2];
text[3] ^= roundKeys[0][3];
/* R - 1 full rounds */
squareRound (text, temp, Td0, Td1, Td2, Td3, roundKeys[1]);
squareRound (temp, text, Td0, Td1, Td2, Td3, roundKeys[2]);
squareRound (text, temp, Td0, Td1, Td2, Td3, roundKeys[3]);
squareRound (temp, text, Td0, Td1, Td2, Td3, roundKeys[4]);
squareRound (text, temp, Td0, Td1, Td2, Td3, roundKeys[5]);
squareRound (temp, text, Td0, Td1, Td2, Td3, roundKeys[6]);
squareRound (text, temp, Td0, Td1, Td2, Td3, roundKeys[7]);
/* last round (diffusion becomes only transposition) */
squareFinal (text, temp, Sd, roundKeys[R]);
#ifdef DESTROY_TEMPORARIES
/* destroy sensitive data: */
temp[0] = temp[1] = temp[2] = temp[3] = 0L;
#endif /* ?DESTROY_TEMPORARIES */
} /* squareDecrypt */
void Square::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
{
word32 text[4], temp[4];
Block::Get(inBlock)(text[0])(text[1])(text[2])(text[3]);
/* initial key addition */
text[0] ^= roundkeys[0][0];
text[1] ^= roundkeys[0][1];
text[2] ^= roundkeys[0][2];
text[3] ^= roundkeys[0][3];
/* ROUNDS - 1 full rounds */
for (int i=1; i+1<ROUNDS; i+=2)
{
squareRound (text, temp, Td[0], Td[1], Td[2], Td[3], roundkeys[i]);
squareRound (temp, text, Td[0], Td[1], Td[2], Td[3], roundkeys[i+1]);
}
squareRound (text, temp, Td[0], Td[1], Td[2], Td[3], roundkeys[ROUNDS-1]);
/* last round (diffusion becomes only transposition) */
squareFinal (text, temp, Sd, roundkeys[ROUNDS]);
Block::Put(xorBlock, outBlock)(text[0])(text[1])(text[2])(text[3]);
}
void Square::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
{
word32 text[4], temp[4];
Block::Get(inBlock)(text[0])(text[1])(text[2])(text[3]);
/* initial key addition */
text[0] ^= roundkeys(0, 0);
text[1] ^= roundkeys(0, 1);
text[2] ^= roundkeys(0, 2);
text[3] ^= roundkeys(0, 3);
/* ROUNDS - 1 full rounds */
for (int i=1; i+1<ROUNDS; i+=2)
{
squareRound (text, temp, Te[0], Te[1], Te[2], Te[3], roundkeys4(i));
squareRound (temp, text, Te[0], Te[1], Te[2], Te[3], roundkeys4(i+1));
}
squareRound (text, temp, Te[0], Te[1], Te[2], Te[3], roundkeys4(ROUNDS-1));
/* last round (diffusion becomes only transposition) */
squareFinal (text, temp, Se, roundkeys4(ROUNDS));
Block::Put(xorBlock, outBlock)(text[0])(text[1])(text[2])(text[3]);
}