unsafe public void Blowfish_Encrypt(BLOWFISH_CTX ctx, ulong *xl, ulong *xr)
{
ulong Xl;
ulong Xr;
ulong temp;
short i;
Xl = *xl;
Xr = *xr;
for (i = 0; i < nValue; ++i)
{
Xl = Xl ^ ctx.P[i];
Xr = F(ctx, Xl) ^ Xr;
temp = Xl;
Xl = Xr;
Xr = temp;
}
temp = Xl;
Xl = Xr;
Xr = temp;
Xr = Xr ^ ctx.P[nValue];
Xl = Xl ^ ctx.P[nValue + 1];
*xl = Xl;
*xr = Xr;
}
unsafe public void Blowfish_Decrypt(BLOWFISH_CTX ctx, ulong *xl, ulong *xr)
{
ulong Xl;
ulong Xr;
ulong temp;
short i;
Xl = *xl;
Xr = *xr;
for (i = nValue + 1; i > 1; --i)
{
Xl = Xl ^ ctx.P[i];
Xr = F(ctx, Xl) ^ Xr;
/* Exchange Xl and Xr */
temp = Xl;
Xl = Xr;
Xr = temp;
}
/* Exchange Xl and Xr */
temp = Xl;
Xl = Xr;
Xr = temp;
Xr = Xr ^ ctx.P[1];
Xl = Xl ^ ctx.P[0];
*xl = Xl;
*xr = Xr;
}
unsafe public void Blowfish_Init(BLOWFISH_CTX ctx, string inKey, int keyLen)
{
// char* key = (char*)inKey;
int i, j, k;
ulong data, datal, datar;
for (i = 0; i < 4; i++)
{
for (j = 0; j < 256; j++)
{
ctx.S[i, j] = ORIG_S[i, j];
}
}
j = 0;
for (i = 0; i < nValue + 2; ++i)
{
data = 0x00000000;
for (k = 0; k < 4; ++k)
{
data = (data << 8) | inKey[j];
j = j + 1;
if (j >= keyLen)
{
j = 0;
}
}
ctx.P[i] = ORIG_P[i] ^ data;
}
datal = 0x00000000;
datar = 0x00000000;
for (i = 0; i < nValue + 2; i += 2)
{
Blowfish_Encrypt(ctx, &datal, &datar);
ctx.P[i] = datal;
ctx.P[i + 1] = datar;
}
for (i = 0; i < 4; ++i)
{
for (j = 0; j < 256; j += 2)
{
Blowfish_Encrypt(ctx, &datal, &datar);
ctx.S[i, j] = datal;
ctx.S[i, j + 1] = datar;
}
}
}
unsafe static ulong F(BLOWFISH_CTX ctx, ulong x)
{
short a, b, c, d;
ulong y;
d = (short)(x & 0xFF);
x >>= 8;
c = (short)(x & 0xFF);
x >>= 8;
b = (short)(x & 0xFF);
x >>= 8;
a = (short)(x & 0xFF);
y = ctx.S[0, a] + ctx.S[1, b];
y = y ^ ctx.S[2, c];
y = y + ctx.S[3, d];
return(y);
}
