public void initializeKey(byte[] key)
{
int i, j, len = key.Length;
uint temp;
Array.Copy(blowfish_pbox, 0, P, 0, 18);
Array.Copy(blowfish_sbox, 0, S0, 0, 256);
Array.Copy(blowfish_sbox, 256, S1, 0, 256);
Array.Copy(blowfish_sbox, 512, S2, 0, 256);
Array.Copy(blowfish_sbox, 768, S3, 0, 256);
for (j = 0, i = 0; i < 16 + 2; i++)
{
temp = (((uint)(key[j]) << 24) |
((uint)(key[(j + 1) % len]) << 16) |
((uint)(key[(j + 2) % len]) << 8) |
((uint)(key[(j + 3) % len])));
P[i] = P[i] ^ temp;
j = (j + 4) % len;
}
byte[] LR = new byte[8];
for (i = 0; i < 16 + 2; i += 2)
{
blockEncrypt(LR, 0, LR, 0);
P[i] = CipherUtil.GetIntBE(LR, 0);
P[i + 1] = CipherUtil.GetIntBE(LR, 4);
}
for (j = 0; j < 256; j += 2)
{
blockEncrypt(LR, 0, LR, 0);
S0[j] = CipherUtil.GetIntBE(LR, 0);
S0[j + 1] = CipherUtil.GetIntBE(LR, 4);
}
for (j = 0; j < 256; j += 2)
{
blockEncrypt(LR, 0, LR, 0);
S1[j] = CipherUtil.GetIntBE(LR, 0);
S1[j + 1] = CipherUtil.GetIntBE(LR, 4);
}
for (j = 0; j < 256; j += 2)
{
blockEncrypt(LR, 0, LR, 0);
S2[j] = CipherUtil.GetIntBE(LR, 0);
S2[j + 1] = CipherUtil.GetIntBE(LR, 4);
}
for (j = 0; j < 256; j += 2)
{
blockEncrypt(LR, 0, LR, 0);
S3[j] = CipherUtil.GetIntBE(LR, 0);
S3[j + 1] = CipherUtil.GetIntBE(LR, 4);
}
}
public void blockDecrypt(byte[] input, int inOffset, byte[] output, int outOffset)
{
uint L, R;
L = CipherUtil.GetIntBE(input, inOffset);
R = CipherUtil.GetIntBE(input, inOffset + 4);
L ^= P[17];
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[16]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[15]);
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[14]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[13]);
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[12]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[11]);
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[10]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[9]);
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[8]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[7]);
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[6]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[5]);
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[4]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[3]);
R ^= ((((S0[(int)((L >> 24) & 0xff)] + S1[(int)((L >> 16) & 0xff)]) ^
S2[(int)((L >> 8) & 0xff)]) + S3[(int)(L & 0xff)]) ^ P[2]);
L ^= ((((S0[(int)((R >> 24) & 0xff)] + S1[(int)((R >> 16) & 0xff)]) ^
S2[(int)((R >> 8) & 0xff)]) + S3[(int)(R & 0xff)]) ^ P[1]);
R ^= P[0];
CipherUtil.PutIntBE(R, output, outOffset);
CipherUtil.PutIntBE(L, output, outOffset + 4);
}
