internal override void SetKey(byte[] key)
{
uint num = 1518500249u;
uint num2 = 1859775393u;
int num3 = 19;
int num4 = 17;
for (int i = 0; i < 24; i++)
{
for (int j = 0; j < 8; j++)
{
_Tm[i * 8 + j] = num;
num += num2;
_Tr[i * 8 + j] = num3;
num3 = ((num3 + num4) & 0x1F);
}
}
byte[] array = new byte[64];
key.CopyTo(array, 0);
for (int k = 0; k < 8; k++)
{
_workingKey[k] = Pack.BE_To_UInt32(array, k * 4);
}
for (int l = 0; l < 12; l++)
{
int num5 = l * 2 * 8;
uint[] workingKey;
(workingKey = _workingKey)[6] = (workingKey[6] ^ Cast5Engine.F1(_workingKey[7], _Tm[num5], _Tr[num5]));
(workingKey = _workingKey)[5] = (workingKey[5] ^ Cast5Engine.F2(_workingKey[6], _Tm[num5 + 1], _Tr[num5 + 1]));
(workingKey = _workingKey)[4] = (workingKey[4] ^ Cast5Engine.F3(_workingKey[5], _Tm[num5 + 2], _Tr[num5 + 2]));
(workingKey = _workingKey)[3] = (workingKey[3] ^ Cast5Engine.F1(_workingKey[4], _Tm[num5 + 3], _Tr[num5 + 3]));
(workingKey = _workingKey)[2] = (workingKey[2] ^ Cast5Engine.F2(_workingKey[3], _Tm[num5 + 4], _Tr[num5 + 4]));
(workingKey = _workingKey)[1] = (workingKey[1] ^ Cast5Engine.F3(_workingKey[2], _Tm[num5 + 5], _Tr[num5 + 5]));
(workingKey = _workingKey)[0] = (workingKey[0] ^ Cast5Engine.F1(_workingKey[1], _Tm[num5 + 6], _Tr[num5 + 6]));
(workingKey = _workingKey)[7] = (workingKey[7] ^ Cast5Engine.F2(_workingKey[0], _Tm[num5 + 7], _Tr[num5 + 7]));
num5 = (l * 2 + 1) * 8;
(workingKey = _workingKey)[6] = (workingKey[6] ^ Cast5Engine.F1(_workingKey[7], _Tm[num5], _Tr[num5]));
(workingKey = _workingKey)[5] = (workingKey[5] ^ Cast5Engine.F2(_workingKey[6], _Tm[num5 + 1], _Tr[num5 + 1]));
(workingKey = _workingKey)[4] = (workingKey[4] ^ Cast5Engine.F3(_workingKey[5], _Tm[num5 + 2], _Tr[num5 + 2]));
(workingKey = _workingKey)[3] = (workingKey[3] ^ Cast5Engine.F1(_workingKey[4], _Tm[num5 + 3], _Tr[num5 + 3]));
(workingKey = _workingKey)[2] = (workingKey[2] ^ Cast5Engine.F2(_workingKey[3], _Tm[num5 + 4], _Tr[num5 + 4]));
(workingKey = _workingKey)[1] = (workingKey[1] ^ Cast5Engine.F3(_workingKey[2], _Tm[num5 + 5], _Tr[num5 + 5]));
(workingKey = _workingKey)[0] = (workingKey[0] ^ Cast5Engine.F1(_workingKey[1], _Tm[num5 + 6], _Tr[num5 + 6]));
(workingKey = _workingKey)[7] = (workingKey[7] ^ Cast5Engine.F2(_workingKey[0], _Tm[num5 + 7], _Tr[num5 + 7]));
_Kr[l * 4] = (int)(_workingKey[0] & 0x1F);
_Kr[l * 4 + 1] = (int)(_workingKey[2] & 0x1F);
_Kr[l * 4 + 2] = (int)(_workingKey[4] & 0x1F);
_Kr[l * 4 + 3] = (int)(_workingKey[6] & 0x1F);
_Km[l * 4] = _workingKey[7];
_Km[l * 4 + 1] = _workingKey[5];
_Km[l * 4 + 2] = _workingKey[3];
_Km[l * 4 + 3] = _workingKey[1];
}
}
private void CAST_Decipher(uint A, uint B, uint C, uint D, uint[] result)
{
for (int i = 0; i < 6; i++)
{
int num = (11 - i) * 4;
C ^= Cast5Engine.F1(D, _Km[num], _Kr[num]);
B ^= Cast5Engine.F2(C, _Km[num + 1], _Kr[num + 1]);
A ^= Cast5Engine.F3(B, _Km[num + 2], _Kr[num + 2]);
D ^= Cast5Engine.F1(A, _Km[num + 3], _Kr[num + 3]);
}
for (int j = 6; j < 12; j++)
{
int num2 = (11 - j) * 4;
D ^= Cast5Engine.F1(A, _Km[num2 + 3], _Kr[num2 + 3]);
A ^= Cast5Engine.F3(B, _Km[num2 + 2], _Kr[num2 + 2]);
B ^= Cast5Engine.F2(C, _Km[num2 + 1], _Kr[num2 + 1]);
C ^= Cast5Engine.F1(D, _Km[num2], _Kr[num2]);
}
result[0] = A;
result[1] = B;
result[2] = C;
result[3] = D;
}