Jp Calderone wrote: > On Tue, 20 Sep 2005 16:08:19 +0100, Michael Sparks <[EMAIL PROTECTED]> > wrote: >>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 :) >> > > You need two ARC4 instances. Performing any operation alters the internal > state (as it is a stream cipher), which is why your bytes did not come out > intact.
Ahh. That makes perfect sense. (I thought it must be me missing something) Many thanks! :-) Regards, Michael. -- http://mail.python.org/mailman/listinfo/python-list