Crypto.Cipher.ARC4, bust or me doing something wrong?

[Michael Sparks]

Hi,


I suspect this is a bug with AMK's Crypto package from
http://www.amk.ca/python/code/crypto , but want to
check to see if I'm being dumb before posting a bug
report.

I'm looking at using this library and to familiarise myself writing
small tests with each of the ciphers. When I hit Crypto.Cipher.ARC4 I've
found that I can't get it to decode what it encodes. This might be a
case of PEBKAC, but I'm trying the following:

>>> from Crypto.Cipher import ARC4 as cipher
>>> key = "........"
>>> obj = cipher.new(key)
>>> obj.encrypt("This is some random text")
')f\xd4\xf6\xa6Lm\x9a%}\x8a\x95\x8ef\x00\xd6:\x12\x00!\xf3k\xafX'
>>> X=_
>>> X
')f\xd4\xf6\xa6Lm\x9a%}\x8a\x95\x8ef\x00\xd6:\x12\x00!\xf3k\xafX'
>>> obj.decrypt(X)
'\x87\xe1\x83\xc1\x93\xdb\xed\x93U\xe4_\x92}\x9f\xdb\x84Y\xa3\xd4b\x9eHu~'

Clearly this decode doesn't match the encode. Me being dumb or bug?

Any comments welcome :)


Michael.
-- 
Michael.Sparks at rd.bbc.co.uk, http://kamaelia.sourceforge.net/
British Broadcasting Corporation, Research and Development
Kingswood Warren, Surrey KT20 6NP

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