public EncryptedStream(Stream output, NpaEntry entry, EncryptionScheme scheme, int arc_key)
{
m_read_mode = false;
m_encrypted_length = GetEncryptedLength(entry, scheme.TitleId);
int key = NpaOpener.GetKeyFromEntry(entry, scheme, arc_key);
m_stream = output;
m_encrypted = new Lazy <byte[]> (() => new byte[m_encrypted_length]);
m_base_pos = m_stream.Position;
byte[] decrypt_table = NpaOpener.GenerateKeyTable(scheme);
byte[] encrypt_table = new byte[256];
for (int i = 0; i < 256; ++i)
{
encrypt_table[decrypt_table[i]] = (byte)i;
}
if (NpaTitleId.LAMENTO == scheme.TitleId)
{
Encrypt = (i, x) => encrypt_table[(x + key) & 0xff];
}
else
{
Encrypt = (i, x) => encrypt_table[(x + key + i) & 0xff];
}
}
public EncryptedStream(NpaArchive arc, NpaEntry entry)
{
m_read_mode = true;
m_encrypted_length = GetEncryptedLength(entry, arc.Scheme.TitleId);
if (m_encrypted_length > entry.Size)
{
m_encrypted_length = (int)entry.Size;
}
int key = NpaOpener.GetKeyFromEntry(entry, arc.Scheme, arc.Key);
m_stream = arc.File.CreateStream(entry.Offset, entry.Size);
m_encrypted = new Lazy <byte[]> (() => InitEncrypted(key, arc.Scheme.TitleId, arc.KeyTable));
m_base_pos = m_stream.Position;
}
