Module Blowfish

Blowfish symmetric cipher

Blowfish is a symmetric block cipher designed by Bruce Schneier.

It has a fixed data block size of 8 bytes and its keys can vary in length from 32 to 448 bits (4 to 56 bytes).

Blowfish is deemed secure and it is fast. However, its keys should be chosen to be big enough to withstand a brute force attack (e.g. at least 16 bytes).

As an example, encryption can be done as follows:

>>> from Crypto.Cipher import Blowfish
>>> from Crypto import Random
>>> from struct import pack
>>>
>>> bs = Blowfish.block_size
>>> key = b'An arbitrarily long key'
>>> iv = Random.new().read(bs)
>>> cipher = Blowfish.new(key, Blowfish.MODE_CBC, iv)
>>> plaintext = b'docendo discimus '
>>> plen = bs - divmod(len(plaintext),bs)[1]
>>> padding = [plen]*plen
>>> padding = pack('b'*plen, *padding)
>>> msg = iv + cipher.encrypt(plaintext + padding)