public byte[] DecryptData(ZipReader.ZipEntry entry, byte[] block, int start, int count)
{
if (block == null || block.Length < count || count < 12)
{
throw new ArgumentException("Invalid arguments for decryption");
}
CRC32 crcgen = new CRC32();
UInt32[] Keys = InitCipher(tpfkey, crcgen);
// Decrypt crypt header
DecryptBlock(block, start, 12, Keys, crcgen); // 12 = crypt header size
// KFreon: Testing header
//Console.WriteLine($"crypt header crc: {block[start + 10]}, {block[start + 11]}");
// KFreon: Doesn't seem to require this
/*if (block[11] != (byte)((entry.CRC >> 24) & 0xff) && (entry.BitFlag & 0x8) != 0x8)
* Console.WriteLine("Incorrect password");*/
DecryptBlock(block, start + 12, count - 12, Keys, crcgen); // Decrypt main block after crypt header
return(block);
}
public static void DecryptData(ZipReader.ZipEntry entry, byte[] block, int start, int count)
{
if (block == null || block.Length < count || count < 12)
{
throw new ArgumentException("Invalid arguments for decryption");
}
crcgen = new CRC32();
InitCipher(tpfkey);
DecryptBlock(block, start, 12);
// KFreon: Apparently not required. Causes some TPF's to fail loading, but when commented out, TPF loads fine, so...
/*if (block[11] != (byte)((entry.CRC >> 24) & 0xff) && (entry.BitFlag & 0x8) != 0x8)
* throw new FormatException("Incorrect password");*/
DecryptBlock(block, start + 12, count - 12);
}
public static void DecryptData(ZipReader.ZipEntry entry, byte[] block, int start, int count)
{
if (block == null || block.Length < count || count < 12)
{
throw new ArgumentException("Invalid arguments for decryption");
}
crcgen = new CRC32();
InitCipher(tpfkey);
DecryptBlock(block, start, 12);
if (block[11] != (byte)((entry.CRC >> 24) & 0xff) && (entry.BitFlag & 0x8) != 0x8)
{
throw new FormatException("Incorrect password");
}
DecryptBlock(block, start + 12, count - 12);
}
public KFreonZipCrypto(ZipReader.ZipEntry entry, byte[] block, int start, int count)
{
Blocks = DecryptData(entry, block, start, count);
}