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Blowfish cipher
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Blowfish is a symmetric cipher algorithm that works in block sizes of 8 bytes. The encrypted and decrypted data is always the of the same length. It is used to decrypt V_CODEs and KIF Archive entries/entry data, encrypt Key Files, and presumably more...
Important Note: Setting the key for a Blowfish cipher is much more expensive than the decryption process. It's highly recommend you keep a copy of your seeded Blowfish class handy so that you do not need to set the key every time.
Because Blowfish works in blocks of 8 bytes, the cipher may only decrypt lengths of bytes that are divisible by 8.
- For KIF Archives, any remaining bytes are not passed when decrypted.
- For V_CODEs, the V_CODE data buffer size must be rounded up to the next 8 bytes in size. (with zero-padding)
The initial values of the Blowfish cipher are the HEX digits of pi in order, from the start of the passes array (PArray) to the end of the substitution boxes (SBlocks).
The exposed class structure during code samples using Blowfish will look as such:
class Blowfish {
// Constructs and initializes a blowfish cipher with the specified key
public Blowfish(byte[] key);
// Set the new key for the blowfish cipher
void SetKey(byte[] key);
// Encrypt/Decrypt the buffer and output to the same buffer
public void Encrypt(byte[] buffer);
public void Decrypt(byte[] buffer);
}