void RC6Decryption::ProcessBlock(const byte *in, byte *out) const
{
const RC6_WORD *sptr = sTable+sTable.size;
RC6_WORD a, b, c, d, t, u;
GetBlockLittleEndian(in, a, b, c, d);
sptr -= 2;
c -= sptr[1];
a -= sptr[0];
for (unsigned i=0; i < r; i++)
{
sptr -= 2;
t = a; a = d; d = c; c = b; b = t;
u = rotlFixed(d*(2*d+1), 5);
t = rotlFixed(b*(2*b+1), 5);
c = rotrMod(c-sptr[1], t) ^ u;
a = rotrMod(a-sptr[0], u) ^ t;
}
sptr -= 2;
d -= sTable[1];
b -= sTable[0];
PutBlockLittleEndian(out, a, b, c, d);
}
void RC6Encryption::ProcessBlock(const byte *in, byte *out) const
{
const RC6_WORD *sptr = sTable;
RC6_WORD a, b, c, d, t, u;
GetBlockLittleEndian(in, a, b, c, d);
b += sptr[0];
d += sptr[1];
sptr += 2;
for(unsigned i=0; i<r; i++)
{
t = rotlFixed(b*(2*b+1), 5);
u = rotlFixed(d*(2*d+1), 5);
a = rotlMod(a^t,u) + sptr[0];
c = rotlMod(c^u,t) + sptr[1];
t = a; a = b; b = c; c = d; d = t;
sptr += 2;
}
a += sptr[0];
c += sptr[1];
PutBlockLittleEndian(out, a, b, c, d);
}
void CRC2Encryptor::Transform(TDes8& aBlock)
{
assert(aBlock.Size() == KRC2BlockBytes);
TUint16 R0, R1, R2, R3;
GetBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3);
TInt i = 0;
for (; i < 16; i++)
{
R0 += (R1 & ~R3) + (R2 & R3) + iK[4*i+0];
R0 = rotlFixed(R0, 1);
R1 += (R2 & ~R0) + (R3 & R0) + iK[4*i+1];
R1 = rotlFixed(R1, 2);
R2 += (R3 & ~R1) + (R0 & R1) + iK[4*i+2];
R2 = rotlFixed(R2, 3);
R3 += (R0 & ~R2) + (R1 & R2) + iK[4*i+3];
R3 = rotlFixed(R3, 5);
if (i == 4 || i == 10)
{
R0 += iK[R3 & 63];
R1 += iK[R0 & 63];
R2 += iK[R1 & 63];
R3 += iK[R2 & 63];
}
}
PutBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3);
}
void CRC2Decryptor::Transform(TDes8& aBlock)
{
assert(aBlock.Size() == KRC2BlockBytes);
TUint16 R0, R1, R2, R3;
GetBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3);
TInt i = 15;
for (; i >= 0; i--)
{
if (i == 4 || i == 10)
{
R3 -= iK[R2 & 63];
R2 -= iK[R1 & 63];
R1 -= iK[R0 & 63];
R0 -= iK[R3 & 63];
}
R3 = rotrFixed(R3, 5);
R3 -= (R0 & ~R2) + (R1 & R2) + iK[4*i+3];
R2 = rotrFixed(R2, 3);
R2 -= (R3 & ~R1) + (R0 & R1) + iK[4*i+2];
R1 = rotrFixed(R1, 2);
R1 -= (R2 & ~R0) + (R3 & R0) + iK[4*i+1];
R0 = rotrFixed(R0, 1);
R0 -= (R1 & ~R3) + (R2 & R3) + iK[4*i+0];
}
PutBlockLittleEndian((TUint8*)&aBlock[0], R0, R1, R2, R3);
}
void RijndaelDecryption::ProcessBlock(const UCHAR *inBlock, UCHAR *outBlock) const
{
ULONG b0[4], b1[4];
GetBlockLittleEndian(inBlock, b0[0], b0[1], b0[2], b0[3]);
b0[0] ^= key[4 * k_len + 24];
b0[1] ^= key[4 * k_len + 25];
b0[2] ^= key[4 * k_len + 26];
b0[3] ^= key[4 * k_len + 27];
const ULONG *kp = key + 4 * (k_len + 5);
if(k_len > 6)
{
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
}
if(k_len > 4)
{
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
}
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_nround(b0, b1, kp);
i_nround(b1, b0, kp); i_lround(b0, b1, kp);
PutBlockLittleEndian(outBlock, b0[0], b0[1], b0[2], b0[3]);
}
void RijndaelEncryption::ProcessBlock(const UCHAR *inBlock, UCHAR *outBlock) const
{
ULONG b0[4], b1[4];
GetBlockLittleEndian(inBlock, b0[0], b0[1], b0[2], b0[3]);
b0[0] ^= key[0];
b0[1] ^= key[1];
b0[2] ^= key[2];
b0[3] ^= key[3];
const ULONG *kp = key + 4;
if(k_len > 6)
{
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
}
if(k_len > 4)
{
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
}
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_nround(b0, b1, kp);
f_nround(b1, b0, kp); f_lround(b0, b1, kp);
PutBlockLittleEndian(outBlock, b0[0], b0[1], b0[2], b0[3]);
}
