private void Encrypt16(byte[] Input, int InOffset, byte[] Output, int OutOffset)
{
int LRD = _expKey.Length - 1;
int keyCtr = 0;
UInt32 X0 = IntUtils.BytesToLe32(Input, InOffset) ^ _expKey[keyCtr];
UInt32 X1 = IntUtils.BytesToLe32(Input, InOffset + 4) ^ _expKey[++keyCtr];
UInt32 X2 = IntUtils.BytesToLe32(Input, InOffset + 8) ^ _expKey[++keyCtr];
UInt32 X3 = IntUtils.BytesToLe32(Input, InOffset + 12) ^ _expKey[++keyCtr];
UInt32 T0, T1;
keyCtr = 7;
do
{
T0 = Fe0(X0);
T1 = Fe3(X1);
X2 ^= T0 + T1 + _expKey[++keyCtr];
X2 = (X2 >> 1) | X2 << 31;
X3 = (X3 << 1 | (X3 >> 31)) ^ (T0 + 2 * T1 + _expKey[++keyCtr]);
T0 = Fe0(X2);
T1 = Fe3(X3);
X0 ^= T0 + T1 + _expKey[++keyCtr];
X0 = (X0 >> 1) | X0 << 31;
X1 = (X1 << 1 | (X1 >> 31)) ^ (T0 + 2 * T1 + _expKey[++keyCtr]);
} while (keyCtr != LRD);
keyCtr = 4;
IntUtils.Le32ToBytes(X2 ^ _expKey[keyCtr], Output, OutOffset);
IntUtils.Le32ToBytes(X3 ^ _expKey[++keyCtr], Output, OutOffset + 4);
IntUtils.Le32ToBytes(X0 ^ _expKey[++keyCtr], Output, OutOffset + 8);
IntUtils.Le32ToBytes(X1 ^ _expKey[++keyCtr], Output, OutOffset + 12);
}
private void SetKey(byte[] Key, byte[] Iv)
{
if (Key != null)
{
if (Key.Length == 32)
{
m_wrkState[0] = IntUtils.BytesToLe32(m_dstCode, 0);
m_wrkState[1] = IntUtils.BytesToLe32(Key, 0);
m_wrkState[2] = IntUtils.BytesToLe32(Key, 4);
m_wrkState[3] = IntUtils.BytesToLe32(Key, 8);
m_wrkState[4] = IntUtils.BytesToLe32(Key, 12);
m_wrkState[5] = IntUtils.BytesToLe32(m_dstCode, 4);
m_wrkState[6] = IntUtils.BytesToLe32(Iv, 0);
m_wrkState[7] = IntUtils.BytesToLe32(Iv, 4);
m_wrkState[8] = IntUtils.BytesToLe32(m_dstCode, 8);
m_wrkState[9] = IntUtils.BytesToLe32(Key, 16);
m_wrkState[10] = IntUtils.BytesToLe32(Key, 20);
m_wrkState[11] = IntUtils.BytesToLe32(Key, 24);
m_wrkState[12] = IntUtils.BytesToLe32(Key, 28);
m_wrkState[13] = IntUtils.BytesToLe32(m_dstCode, 12);
}
else
{
m_wrkState[0] = IntUtils.BytesToLe32(m_dstCode, 0);
m_wrkState[1] = IntUtils.BytesToLe32(Key, 0);
m_wrkState[2] = IntUtils.BytesToLe32(Key, 4);
m_wrkState[3] = IntUtils.BytesToLe32(Key, 8);
m_wrkState[4] = IntUtils.BytesToLe32(Key, 12);
m_wrkState[5] = IntUtils.BytesToLe32(m_dstCode, 4);
m_wrkState[6] = IntUtils.BytesToLe32(Iv, 0);
m_wrkState[7] = IntUtils.BytesToLe32(Iv, 4);
m_wrkState[8] = IntUtils.BytesToLe32(m_dstCode, 8);
m_wrkState[9] = IntUtils.BytesToLe32(Key, 0);
m_wrkState[10] = IntUtils.BytesToLe32(Key, 4);
m_wrkState[11] = IntUtils.BytesToLe32(Key, 8);
m_wrkState[12] = IntUtils.BytesToLe32(Key, 12);
m_wrkState[13] = IntUtils.BytesToLe32(m_dstCode, 12);
}
}
}
private void Encrypt16(byte[] Input, int InOffset, byte[] Output, int OutOffset)
{
int LRD = m_expKey.Length - 5;
int keyCtr = -1;
// input round
uint R0 = IntUtils.BytesToLe32(Input, InOffset);
uint R1 = IntUtils.BytesToLe32(Input, InOffset + 4);
uint R2 = IntUtils.BytesToLe32(Input, InOffset + 8);
uint R3 = IntUtils.BytesToLe32(Input, InOffset + 12);
// process 8 round blocks
do
{
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb0(ref R0, ref R1, ref R2, ref R3);
LinearTransform(ref R0, ref R1, ref R2, ref R3);
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb1(ref R0, ref R1, ref R2, ref R3);
LinearTransform(ref R0, ref R1, ref R2, ref R3);
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb2(ref R0, ref R1, ref R2, ref R3);
LinearTransform(ref R0, ref R1, ref R2, ref R3);;
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb3(ref R0, ref R1, ref R2, ref R3);
LinearTransform(ref R0, ref R1, ref R2, ref R3);
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb4(ref R0, ref R1, ref R2, ref R3);
LinearTransform(ref R0, ref R1, ref R2, ref R3);
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb5(ref R0, ref R1, ref R2, ref R3);
LinearTransform(ref R0, ref R1, ref R2, ref R3);
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb6(ref R0, ref R1, ref R2, ref R3);
LinearTransform(ref R0, ref R1, ref R2, ref R3);
R0 ^= m_expKey[++keyCtr];
R1 ^= m_expKey[++keyCtr];
R2 ^= m_expKey[++keyCtr];
R3 ^= m_expKey[++keyCtr];
Sb7(ref R0, ref R1, ref R2, ref R3);
// skip on last block
if (keyCtr != LRD)
{
LinearTransform(ref R0, ref R1, ref R2, ref R3);
}
}while (keyCtr != LRD);
// last round
IntUtils.Le32ToBytes(m_expKey[++keyCtr] ^ R0, Output, OutOffset);
IntUtils.Le32ToBytes(m_expKey[++keyCtr] ^ R1, Output, OutOffset + 4);
IntUtils.Le32ToBytes(m_expKey[++keyCtr] ^ R2, Output, OutOffset + 8);
IntUtils.Le32ToBytes(m_expKey[++keyCtr] ^ R3, Output, OutOffset + 12);
}
private UInt32[] ExpandKey(byte[] Key)
{
int k64Cnt = Key.Length / 8;
int kmLen = k64Cnt > 4 ? 8 : 4;
int keyCtr = 0;
UInt32 A, B, Q;
UInt32 Y0, Y1, Y2, Y3;
UInt32[] eKm = new UInt32[kmLen];
UInt32[] oKm = new UInt32[kmLen];
byte[] sbKey = new byte[Key.Length == 64 ? 32 : 16];
UInt32[] wK = new UInt32[_dfnRounds * 2 + 8];
for (int i = 0; i < k64Cnt; i++)
{
// round key material
eKm[i] = IntUtils.BytesToLe32(Key, keyCtr);
keyCtr += 4;
oKm[i] = IntUtils.BytesToLe32(Key, keyCtr);
keyCtr += 4;
// sbox key material
IntUtils.Le32ToBytes(MDSEncode(eKm[i], oKm[i]), sbKey, ((k64Cnt * 4) - 4) - (i * 4));
}
keyCtr = 0;
while (keyCtr < KEY_BITS)
{
// create the expanded key
if (keyCtr < (wK.Length / 2))
{
Q = (uint)keyCtr * SK_STEP;
A = Mix(Q, eKm, k64Cnt);
B = Mix(Q + SK_BUMP, oKm, k64Cnt);
B = B << 8 | (UInt32)(B >> 24);
A += B;
wK[keyCtr * 2] = A;
A += B;
wK[keyCtr * 2 + 1] = A << SK_ROTL | (UInt32)(A >> (32 - SK_ROTL));
}
Y0 = Y1 = Y2 = Y3 = (uint)keyCtr;
// 512 key
if (Key.Length == 64)
{
Y0 = (uint)(byte)Q1[Y0] ^ sbKey[28];
Y1 = (uint)(byte)Q0[Y1] ^ sbKey[29];
Y2 = (uint)(byte)Q0[Y2] ^ sbKey[30];
Y3 = (uint)(byte)Q1[Y3] ^ sbKey[31];
Y0 = (uint)(byte)Q1[Y0] ^ sbKey[24];
Y1 = (uint)(byte)Q1[Y1] ^ sbKey[25];
Y2 = (uint)(byte)Q0[Y2] ^ sbKey[26];
Y3 = (uint)(byte)Q0[Y3] ^ sbKey[27];
Y0 = (uint)(byte)Q0[Y0] ^ sbKey[20];
Y1 = (uint)(byte)Q1[Y1] ^ sbKey[21];
Y2 = (uint)(byte)Q1[Y2] ^ sbKey[22];
Y3 = (uint)(byte)Q0[Y3] ^ sbKey[23];
Y0 = (uint)(byte)Q0[Y0] ^ sbKey[16];
Y1 = (uint)(byte)Q0[Y1] ^ sbKey[17];
Y2 = (uint)(byte)Q1[Y2] ^ sbKey[18];
Y3 = (uint)(byte)Q1[Y3] ^ sbKey[19];
}
// 256 key
if (Key.Length > 24)
{
Y0 = (uint)(byte)Q1[Y0] ^ sbKey[12];
Y1 = (uint)(byte)Q0[Y1] ^ sbKey[13];
Y2 = (uint)(byte)Q0[Y2] ^ sbKey[14];
Y3 = (uint)(byte)Q1[Y3] ^ sbKey[15];
}
// 192 key
if (Key.Length > 16)
{
Y0 = (uint)(byte)Q1[Y0] ^ sbKey[8];
Y1 = (uint)(byte)Q1[Y1] ^ sbKey[9];
Y2 = (uint)(byte)Q0[Y2] ^ sbKey[10];
Y3 = (uint)(byte)Q0[Y3] ^ sbKey[11];
}
// sbox members as MDS matrix multiplies
_sprBox[keyCtr * 2] = MDS0[(byte)Q0[(byte)Q0[Y0] ^ sbKey[4]] ^ sbKey[0]];
_sprBox[keyCtr * 2 + 1] = MDS1[(byte)Q0[Q1[Y1] ^ sbKey[5]] ^ sbKey[1]];
_sprBox[(keyCtr * 2) + 0x200] = MDS2[(byte)Q1[(byte)Q0[Y2] ^ sbKey[6]] ^ sbKey[2]];
_sprBox[keyCtr++ *2 + 0x201] = MDS3[(byte)Q1[(byte)Q1[Y3] ^ sbKey[7]] ^ sbKey[3]];
}
// key processed
_isInitialized = true;
return(wK);
}
private void Decrypt16(byte[] Input, int InOffset, byte[] Output, int OutOffset)
{
int LRD = 4;
int keyCtr = m_expKey.Length;
// input round
uint R3 = m_expKey[--keyCtr] ^ IntUtils.BytesToLe32(Input, InOffset + 12);
uint R2 = m_expKey[--keyCtr] ^ IntUtils.BytesToLe32(Input, InOffset + 8);
uint R1 = m_expKey[--keyCtr] ^ IntUtils.BytesToLe32(Input, InOffset + 4);
uint R0 = m_expKey[--keyCtr] ^ IntUtils.BytesToLe32(Input, InOffset);
// process 8 round blocks
do
{
Ib7(ref R0, ref R1, ref R2, ref R3);
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
Ib6(ref R0, ref R1, ref R2, ref R3);
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
Ib5(ref R0, ref R1, ref R2, ref R3);
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
Ib4(ref R0, ref R1, ref R2, ref R3);
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
Ib3(ref R0, ref R1, ref R2, ref R3);
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
Ib2(ref R0, ref R1, ref R2, ref R3);
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
Ib1(ref R0, ref R1, ref R2, ref R3);
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
Ib0(ref R0, ref R1, ref R2, ref R3);
// skip on last block
if (keyCtr != LRD)
{
R3 ^= m_expKey[--keyCtr];
R2 ^= m_expKey[--keyCtr];
R1 ^= m_expKey[--keyCtr];
R0 ^= m_expKey[--keyCtr];
InverseTransform(ref R0, ref R1, ref R2, ref R3);
}
}while (keyCtr != LRD);
// last round
IntUtils.Le32ToBytes(R3 ^ m_expKey[--keyCtr], Output, OutOffset + 12);
IntUtils.Le32ToBytes(R2 ^ m_expKey[--keyCtr], Output, OutOffset + 8);
IntUtils.Le32ToBytes(R1 ^ m_expKey[--keyCtr], Output, OutOffset + 4);
IntUtils.Le32ToBytes(R0 ^ m_expKey[--keyCtr], Output, OutOffset);
}