internal override Stream DecryptEntry(Stream input, PazEntry entry)
{
if (Version < 1)
{
using (input)
{
var data = new byte[entry.AlignedSize];
input.Read(data, 0, data.Length);
for (int i = 0; i < data.Length; ++i)
{
data[i] = MovKey[data[i]];
}
return(new BinMemoryStream(data, entry.Name));
}
}
var key = new byte[0x100];
for (int i = 0; i < 0x100; ++i)
{
key[i] = (byte)(MovKey[i] ^ entry.Key[i % entry.Key.Length]);
}
var rc4 = new Rc4Transform(key);
var block = rc4.GenerateBlock((int)Math.Min(0x10000, input.Length));
return(new ByteStringEncryptedStream(input, block));
}
internal override Stream DecryptEntry(Stream input, PazEntry entry)
{
input = new InputCryptoStream(input, Encryption.CreateDecryptor());
var key = entry.Key;
if (null == key)
{
return(input);
}
var rc4 = new Rc4Transform(key);
if (Version >= 2)
{
uint crc = Crc32.Compute(key, 0, key.Length);
int skip_rounds = (int)(crc >> 12) & 0xFF;
for (int i = 0; i < skip_rounds; ++i)
{
rc4.NextByte();
}
}
return(new InputCryptoStream(input, rc4));
}
internal abstract Stream DecryptEntry(Stream input, PazEntry entry);
