private static void Enc(ref uint ll, uint r, BlowfishData key, int pi)
{
ll ^= key.P[pi];
var t = key.S[0 + ((r >> 24) & 0xFFU)];
t += key.S[256 + ((r >> 16) & 0xFFU)];
t ^= key.S[512 + ((r >> 8) & 0xFFU)];
t += key.S[768 + (r & 0xFFU)];
ll ^= t;
}
public static void Decrypt(uint[] data, int offset, BlowfishData key)
{
var l = data[offset];
var r = data[offset + 1];
l ^= key.P[BfRounds + 1];
Enc(ref r, l, key, 4);
Enc(ref l, r, key, 3);
Enc(ref r, l, key, 2);
Enc(ref l, r, key, 1);
r ^= key.P[0];
data[offset + 1] = l & 0xFFFFFFFFU;
data[offset] = r & 0xFFFFFFFFU;
}
public static void SetKey(byte[] data, BlowfishData key)
{
byte d = 0;
const byte end = 8;
uint[] im = { 0U, 0U };
Array.Copy(BfInit.P, key.P, BfInit.P.Length);
Array.Copy(BfInit.S, key.S, BfInit.S.Length);
for (var i = 0; i < 6; ++i)
{
uint ri = data[d++];
if (d >= end)
{
d = 0;
}
ri <<= 8;
ri |= data[d++];
if (d >= end)
{
d = 0;
}
ri <<= 8;
ri |= data[d++];
if (d >= end)
{
d = 0;
}
ri <<= 8;
ri |= data[d++];
if (d >= end)
{
d = 0;
}
key.P[i] ^= ri;
}
im[0] = 0;
im[1] = 0;
for (var ii = 0; ii < 6; ii += 2)
{
Encrypt(im, 0, key);
key.P[ii] = im[0];
key.P[ii + 1] = im[1];
}
for (var k = 0; k < 1024; k += 2)
{
Encrypt(im, 0, key);
key.S[k] = im[0];
key.S[k + 1] = im[1];
}
}
