// constructs the enctryption sieve
public void Initialize(byte *key, int keybytes)
{
int i, j;
uint data, datal, datar;
aword temp = new aword();
// first fill arrays from data tables
for (i = 0; i < 18; i++)
{
PArray[i] = bf_P[i];
}
for (i = 0; i < 4; i++)
{
for (j = 0; j < 256; j++)
{
SBoxes[i, j] = bf_S[i, j];
}
}
j = 0;
for (i = 0; i < NPASS + 2; ++i)
{
temp.dword = 0;
temp.byte0 = key[j];
temp.byte1 = key[(j + 1) % keybytes];
temp.byte2 = key[(j + 2) % keybytes];
temp.byte3 = key[(j + 3) % keybytes];
data = temp.dword;
PArray[i] ^= data;
j = (j + 4) % keybytes;
}
datal = 0;
datar = 0;
for (i = 0; i < NPASS + 2; i += 2)
{
Blowfish_encipher(&datal, &datar);
PArray[i] = datal;
PArray[i + 1] = datar;
}
for (i = 0; i < 4; ++i)
{
for (j = 0; j < 256; j += 2)
{
Blowfish_encipher(&datal, &datar);
SBoxes[i, j] = datal;
SBoxes[i, j + 1] = datar;
}
}
}
private unsafe void Blowfish_decipher(uint *xl, uint *xr)
{
aword Xl = new aword();
aword Xr = new aword();
Xl.dword = *xl;
Xr.dword = *xr;
Xl.dword ^= PArray[17];
/*ROUND(ref Xr, Xl, 16);
* ROUND(ref Xl, Xr, 15);
* ROUND(ref Xr, Xl, 14);
* ROUND(ref Xl, Xr, 13);
* ROUND(ref Xr, Xl, 12);
* ROUND(ref Xl, Xr, 11);
* ROUND(ref Xr, Xl, 10);
* ROUND(ref Xl, Xr, 9);
* ROUND(ref Xr, Xl, 8);
* ROUND(ref Xl, Xr, 7);
* ROUND(ref Xr, Xl, 6);
* ROUND(ref Xl, Xr, 5);
* ROUND(ref Xr, Xl, 4);
* ROUND(ref Xl, Xr, 3);
* ROUND(ref Xr, Xl, 2);
* ROUND(ref Xl, Xr, 1);*/
Xr.dword ^= ROUND(Xl, 16);
Xl.dword ^= ROUND(Xr, 15);
Xr.dword ^= ROUND(Xl, 14);
Xl.dword ^= ROUND(Xr, 13);
Xr.dword ^= ROUND(Xl, 12);
Xl.dword ^= ROUND(Xr, 11);
Xr.dword ^= ROUND(Xl, 10);
Xl.dword ^= ROUND(Xr, 9);
Xr.dword ^= ROUND(Xl, 8);
Xl.dword ^= ROUND(Xr, 7);
Xr.dword ^= ROUND(Xl, 6);
Xl.dword ^= ROUND(Xr, 5);
Xr.dword ^= ROUND(Xl, 4);
Xl.dword ^= ROUND(Xr, 3);
Xr.dword ^= ROUND(Xl, 2);
Xl.dword ^= ROUND(Xr, 1);
Xr.dword ^= PArray[0];
*xl = Xr.dword;
*xr = Xl.dword;
}
//[MethodImpl(MethodImplOptions.AggressiveInlining)]
private uint ROUND(aword x, int n)
{
//a.dword ^= bf_F(x) ^ PArray[n];
Count++;
return((((SBoxes[0, x.byte0] + SBoxes[1, x.byte1]) ^ SBoxes[2, x.byte2]) + SBoxes[3, x.byte3]) ^ PArray[n]);
}
private void ROUND(ref aword a, aword x, int n)
{
//a.dword ^= bf_F(x) ^ PArray[n];
a.dword ^= (((SBoxes[0, x.byte0] + SBoxes[1, x.byte1]) ^ SBoxes[2, x.byte2]) + SBoxes[3, x.byte3]) ^ PArray[n];
}
/*private uint S(aword x, int i) {
* return SBoxes[i, x.bytes[i]];
* }*/
//[MethodImpl(MethodImplOptions.AggressiveInlining)]
private uint bf_F(aword x)
{
return(((SBoxes[0, x.byte0] + SBoxes[1, x.byte1]) ^ SBoxes[2, x.byte2]) + SBoxes[3, x.byte3]);
}
