import sha
import md5
VOWELS = list('aeiouy')
CONSONANTS = list('bcdfghklmnprstvzx')
def bubble_babble(message):
"""Encode a message in bubblebabble format.
The Bubble Babble Binary Data Encoding
ftp://ftp.ietf.org/ietf-mail-archive/secsh/2001-08.mail
The Bubble Babble Encoding encodes arbitrary binary data into
pseudowords that are more natural to humans and that can be
pronounced relatively easily.
Code is an adapted from the following Perl module: Digest::BubbleBabble v0.01
http://search.cpan.org/~btrott/Digest-BubbleBabble-0.01/BubbleBabble.pm
"""
seed = 1
mlen = len(message)
mval = [ord(str(x)) for x in message]
rounds = mlen//2 + 1
encparts = ['x']
eextend = encparts.extend
for i in xrange(rounds):
if (i+1 < rounds) or (mlen % 2 != 0):
imval2i = int(mval[2*i])
idx0 = (((imval2i >> 6) & 3) + seed) % 6
idx1 = (imval2i >> 2) & 15
idx2 = ((imval2i & 3) + seed//6) % 6
eextend([VOWELS[idx0],CONSONANTS[idx1],VOWELS[idx2]])
if (i+1 < rounds):
imval2i1 = int(mval[2*i + 1])
idx3 = (imval2i1 >> 4) & 15
idx4 = imval2i1 & 15
eextend([CONSONANTS[idx3],'-',CONSONANTS[idx4]])
seed = (seed*5 + imval2i*7 + imval2i1) % 36
else:
idx0 = seed % 6
idx1 = 16
idx2 = seed//6
eextend([VOWELS[idx0],CONSONANTS[idx1],VOWELS[idx2]])
eextend(['x'])
encoded = ''.join(encparts)
return encoded
def digestbb(message, algo=sha):
"""Compute the digest of a message in Bubble Babble format."""
mdigest = algo.new()
mdigest.update(message)
return bubble_babble(mdigest.digest())
if __name__ == '__main__':
assert bubble_babble('') == 'xexax'
assert bubble_babble('1234567890') == 'xesef-disof-gytuf-katof-movif-baxux'
assert bubble_babble('Pineapple') == 'xigak-nyryk-humil-bosek-sonax'
assert digestbb('foo',algo=sha) == 'xedov-vycir-hopof-zofot-radoh-tofyt-gezuf-sikus-dotet-pydif-faxux'
assert digestbb('foo',algo=md5) == 'xorar-takyt-rufys-davuh-suruv-zinog-zifos-genet-moxix'
