void _Generate(FF_pike ctx)
{
for (int i = 0; i < 1024; ++i)
{
int carry = ctx.addikey[0].carry + ctx.addikey[1].carry + ctx.addikey[2].carry;
if (carry == 0 || carry == 3)
{
_AddikeyNext(ctx.addikey[0]);
_AddikeyNext(ctx.addikey[1]);
_AddikeyNext(ctx.addikey[2]);
}
else
{
int flag = 0;
if (carry == 2)
{
flag = 1;
}
for (int j = 0; j < 3; ++j)
{
if (ctx.addikey[j].carry == flag)
{
_AddikeyNext(ctx.addikey[j]);
}
}
}
uint tmp = ctx.addikey[0].buffer[ctx.addikey[0].index] ^ ctx.addikey[1].buffer[ctx.addikey[1].index]
^ ctx.addikey[2].buffer[ctx.addikey[2].index];
int base_ = i << 2;
ctx.buffer[base_] = (byte)tmp;
ctx.buffer[base_ + 1] = (byte)(tmp >> 8);
ctx.buffer[base_ + 2] = (byte)(tmp >> 16);
ctx.buffer[base_ + 3] = (byte)(tmp >> 24);
}
ctx.index = 0;
}
FF_pike NewCtx(uint sd)
{
FF_pike ctx = new FF_pike();
ctx.sd = sd ^ GENIUS_NUMBER;
ctx.addikey[0].sd = ctx.sd;
ctx.addikey[0].sd = Linearity(ctx.addikey[0].sd);
ctx.addikey[0].dis1 = 55;
ctx.addikey[0].dis2 = 24;
ctx.addikey[1].sd = ((ctx.sd & 0xAAAAAAAA) >> 1) | ((ctx.sd & 0x55555555) << 1);
ctx.addikey[1].sd = Linearity(ctx.addikey[1].sd);
ctx.addikey[1].dis1 = 57;
ctx.addikey[1].dis2 = 7;
ctx.addikey[2].sd = ~(((ctx.sd & 0xF0F0F0F0) >> 4) | ((ctx.sd & 0x0F0F0F0F) << 4));
ctx.addikey[2].sd = Linearity(ctx.addikey[2].sd);
ctx.addikey[2].dis1 = 58;
ctx.addikey[2].dis2 = 19;
for (int i = 0; i < 3; ++i)
{
uint tmp = ctx.addikey[i].sd;
for (int j = 0; j < 64; ++j)
{
for (int k = 0; k < 32; ++k)
{
tmp = Linearity(tmp);
}
ctx.addikey[i].buffer[j] = tmp;
}
ctx.addikey[i].carry = 0;
ctx.addikey[i].index = 63;
}
ctx.index = 4096;
return(ctx);
}
void Codec(FF_pike ctx, ref byte[] data, int offset = 0)
{
if (data.Length - offset <= 0)
{
return;
}
unsafe
{
fixed(byte *pDataBase_ = data, pSequenceBase = ctx.buffer)
{
int len = data.Length - offset;
byte *pDataBase = pDataBase_ + offset;
byte *pData = pDataBase;
while (true)
{
int n = 4096 - ctx.index;
if (n <= 0)
{
_Generate(ctx);
continue;
}
if (n > len - (int)(pData - pDataBase))
{
n = len - (int)(pData - pDataBase);
}
byte *pSequence = pSequenceBase + ctx.index;
int w = n / sizeof(uint);
if (w > 0)
{
uint *dx = (uint *)pData;
uint *ax = (uint *)pSequence;
for (int i = 0; i < w; ++i)
{
*dx ^= *ax;
++dx;
++ax;
}
}
pData += w * sizeof(uint);
pSequence += w * sizeof(uint);
for (int i = (n - n % sizeof(uint)); i < n; ++i)
{
*pData ^= *pSequence;
++pData;
++pSequence;
}
ctx.index += n;
if (pData - pDataBase == len)
{
break;
}
}
}
}
}
public Pike(uint key)
{
ctx = NewCtx(key);
}
