public Biff8DecryptingStream(Stream in1, int InitialOffSet, Biff8EncryptionKey key)
{
_rc4 = new Biff8RC4(InitialOffSet, key);
if (in1 is ILittleEndianInput)
{
// accessing directly is an optimisation
_le = (ILittleEndianInput)in1;
}
else
{
// less optimal, but should work OK just the same. Often occurs in junit tests.
_le = new LittleEndianInputStream(in1);
}
}
public Biff8RC4(int InitialOffset, Biff8EncryptionKey key)
{
if (InitialOffset >= RC4_REKEYING_INTERVAL)
{
throw new Exception("InitialOffset (" + InitialOffset + ")>"
+ RC4_REKEYING_INTERVAL + " not supported yet");
}
_key = key;
_streamPos = 0;
RekeyForNextBlock();
_streamPos = InitialOffset;
for (int i = InitialOffset; i > 0; i--)
{
_rc4.Output();
}
_shouldSkipEncryptionOnCurrentRecord = false;
}