Blowfish-algorithm-python

Implementation of blowfish algorithm in python.

Algorithm for blowfish encryption and decryption-

Encryption:

Take plaintext input. Divide plaintext into two halves of 32 bit each. For i=1 to 16 left = left^p[i] Right = right ^ F(left) Left,right = swap (left,right) i++ Left,right = swap(left,right) Left = left^p[18] Right = right^p[17] Combine left and right to get encrypted text.

Decryption:

Take plaintext input. Divide plaintext into two halves of 32 bit each. For i=18 to 3 left = left^p[i] Right = right ^ F(left) Left,right = swap (left,right) i++ Left,right = swap(left,right) Left = left^p[0] Right = right^p[1] Combine left and right to get decrypted text.