Some throwaway code I used to demonstrate the blowfish cipher with the PyCrypto library

ciphering_blowfish.py

# Sample code by Mark Nenadov.
#
# Warning, this is OLD legacy code. It hasn't been tested in semi recent versions
# of Python or PyCrypto.
#
# You may use this however you wish, but I retain no responsibility whatsoever for how
# you use it and provide it with no warranty, either.


from Crypto.Cipher import Blowfish

INPUT_SIZE = 8

def pad_string(str):

	new_str = str
	pad_chars = INPUT_SIZE - (len(str) % INPUT_SIZE)

	if pad_chars != 0:
		for x in range(pad_chars):
			new_str += " "
		

	return new_str

plaintext = "Meet me and Charles at 7pm at the bridge."

crypt_obj = Blowfish.new('abcdefghijklmnop', Blowfish.MODE_ECB)
ciphertext = crypt_obj.encrypt(pad_string(plaintext))

print "Plaintext: " + plaintext
print "Blowfish Cyphertext: " + ciphertext
print "Back to Plaintext: " + crypt_obj.decrypt(ciphertext)