public void BlockDecrypt(byte[] input, int inOffset, byte[] output, int outOffset)
{
uint t;
int i;
uint[] lr = new uint[2];
lr[0] = CipherUtil.GetIntLE(input, inOffset);
lr[1] = CipherUtil.GetIntLE(input, inOffset + 4);
initPerm(lr);
t = (lr[1] << 1) | (lr[1] >> 31);
lr[1] = (lr[0] << 1) | (lr[0] >> 31);
lr[0] = t;
for (i = 30; i > 0; i -= 4)
{
desCipher1(lr, i);
desCipher2(lr, i - 2);
}
lr[0] = (lr[0] >> 1) | (lr[0] << 31);
lr[1] = (lr[1] >> 1) | (lr[1] << 31);
finalPerm(lr);
CipherUtil.PutIntLE(lr[0], output, outOffset);
CipherUtil.PutIntLE(lr[1], output, outOffset + 4);
}
public void InitializeKey(byte[] key, int offset)
{
uint i, c, d, t, s, shifts;
c = CipherUtil.GetIntLE(key, offset + 0);
d = CipherUtil.GetIntLE(key, offset + 4);
t = ((d >> 4) ^ c) & 0x0f0f0f0f;
c ^= t;
d ^= t << 4;
t = (((c << (16 - (-2))) ^ c) & 0xcccc0000);
c = c ^ t ^ (t >> (16 - (-2)));
t = (((d << (16 - (-2))) ^ d) & 0xcccc0000);
d = d ^ t ^ (t >> (16 - (-2)));
t = ((d >> 1) ^ c) & 0x55555555;
c ^= t;
d ^= t << 1;
t = ((c >> 8) ^ d) & 0x00ff00ff;
d ^= t;
c ^= t << 8;
t = ((d >> 1) ^ c) & 0x55555555;
c ^= t;
d ^= t << 1;
d = ((d & 0xff) << 16) | (d & 0xff00) |
((d >> 16) & 0xff) | ((c >> 4) & 0xf000000);
c &= 0x0fffffff;
shifts = 0x7efc;
for (i = 0; i < 16; i++)
{
if ((shifts & 1) != 0)
{
c = ((c >> 2) | (c << 26));
d = ((d >> 2) | (d << 26));
}
else
{
c = ((c >> 1) | (c << 27));
d = ((d >> 1) | (d << 27));
}
shifts >>= 1;
c &= 0x0fffffff;
d &= 0x0fffffff;
s = SKB[0, (c) & 0x3f] |
SKB[1, ((c >> 6) & 0x03) | ((c >> 7) & 0x3c)] |
SKB[2, ((c >> 13) & 0x0f) | ((c >> 14) & 0x30)] |
SKB[3, ((c >> 20) & 0x01) | ((c >> 21) & 0x06) | ((c >> 22) & 0x38)];
t = SKB[4, (d) & 0x3f] |
SKB[5, ((d >> 7) & 0x03) | ((d >> 8) & 0x3c)] |
SKB[6, (d >> 15) & 0x3f] |
SKB[7, ((d >> 21) & 0x0f) | ((d >> 22) & 0x30)];
_key[i * 2] = ((t << 16) | (s & 0xffff));
s = ((s >> 16) | (t & 0xffff0000));
_key[(i * 2) + 1] = (s << 4) | (s >> 28);
}
}
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 EncryptCBC(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
{
int nBlocks = inputLen / 8;
for (int bc = 0; bc < nBlocks; bc++)
{
CipherUtil.BlockXor(input, inputOffset, 8, _iv, 0);
BlockEncrypt(_iv, 0, output, outputOffset);
Array.Copy(output, outputOffset, _iv, 0, 8);
inputOffset += 8;
outputOffset += 8;
}
}
public void encryptCBC(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
{
int nBlocks = inputLen / BLOCK_SIZE;
for (int bc = 0; bc < nBlocks; bc++)
{
CipherUtil.BlockXor(input, inputOffset, BLOCK_SIZE, IV, 0);
blockEncrypt(IV, 0, output, outputOffset);
Array.Copy(output, outputOffset, IV, 0, BLOCK_SIZE);
inputOffset += BLOCK_SIZE;
outputOffset += BLOCK_SIZE;
}
}
public void encryptCBC(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
{
int block_size = GetBlockSize();
int nBlocks = inputLen / block_size;
for (int bc = 0; bc < nBlocks; bc++)
{
CipherUtil.BlockXor(input, inputOffset, block_size, _IV, 0);
blockEncrypt(_IV, 0, output, outputOffset);
Array.Copy(output, outputOffset, _IV, 0, block_size);
inputOffset += block_size;
outputOffset += block_size;
}
}
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);
}
