public override void SetParameter(Octets param)
{
Octets k_ipad = new Octets(64);
int keylen = param.size();
if (keylen > 64)
{
Octets key = MD5Hash.Digest(param);
k_ipad.replace(key);
k_opad.replace(key);
keylen = key.size();
}
else
{
k_ipad.replace(param);
k_opad.replace(param);
}
int i = 0;
for (; i < keylen; i++)
{
k_ipad.setByte(i, (byte)(k_ipad.getByte(i) ^ 0x36));
k_opad.setByte(i, (byte)(k_opad.getByte(i) ^ 0x5c));
}
for (; i < 64; i++)
{
k_ipad.setByte(i, (byte)0x36);
k_opad.setByte(i, (byte)0x5c);
}
k_ipad.resize(64);
k_opad.resize(64);
md5hash.Update(k_ipad);
}
public override Octets Update(Octets o)
{
int len = o.size();
for (int i = 0; i < len; i++)
{
index2 += perm[(++index1) & 0xff];
byte k = perm[index1 & 0xff]; perm[index1 & 0xff] = perm[index2 & 0xff]; perm[index2 & 0xff] = k;
byte j = (byte)(perm[index1 & 0xff] + perm[index2 & 0xff]);
o.setByte(i, (byte)(o.getByte(i) ^ perm[j & 0xff]));
}
return o;
}
public override void SetParameter(Octets o)
{
int keylen = o.size();
byte j = 0;
for (int i = 0; i < 256; i++) perm[i] = (byte)i;
for (int i = 0; i < 256; i++)
{
j += perm[i];
j += o.getByte(i % keylen);
byte k; k = perm[i]; perm[i] = perm[j & 0xff]; perm[j & 0xff] = k;
}
index1 = index2 = 0;
}