[Pycrypto-checkins] [ pycrypto-Bugs-1473773 ] Every mode except ECB in AES fails?

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Bugs item #1473773, was opened at 2006-04-20 18:59
Message generated for change (Comment added) made by calzas
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Category: None
Group: None
Status: Open
Resolution: Rejected
Priority: 5
Submitted By: Juan de las Calzas Verdes (calzas)
Assigned to: Nobody/Anonymous (nobody)
Summary: Every mode except ECB in AES fails?

Initial Comment:
See a little script and its results

--------------------------
import Crypto.Cipher.AES
import binascii

AES = Crypto.Cipher.AES
text = 'abcdefghijklmnop'
myIV = '0123456789ABCDEF'
mykey = '16 bytes text XX'
print 'Original: ', binascii.hexlify(text)
for mode in range(1, 6):
    obj = AES.new(mykey, mode, myIV)
    dec = obj.decrypt(obj.encrypt(text))
    print 'Mode: ', mode, '  Decr(Encr(Original)): ',
binascii.hexlify(dec)
--------------------------

Output:

Original:  6162636465666768696a6b6c6d6e6f70
Mode:  1   Decr(Encr(Original)): 
6162636465666768696a6b6c6d6e6f70
Mode:  2   Decr(Encr(Original)): 
fe8c779f1bf840fc83de99bf8ddca587
Mode:  3   Decr(Encr(Original)): 
776978676b3c2d69180143ed54cfd062
Mode:  4   Decr(Encr(Original)): 
9ef7106d9d229f2d696a6b6c6d6e6f70
Mode:  5   Decr(Encr(Original)): 
c2e0fd3ee88477829300f6a77565cbc0


Why doesn't it work? Shouldn't it? It does work if you
create different objects for encryption and decryption.



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>Comment By: Juan de las Calzas Verdes (calzas)
Date: 2006-04-20 19:58

Message:
Logged In: YES 
user_id=1506211

Forget it. Of course the objects have to "remember" the
state of the enciphering process in most of the modes. I am
stupid.


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=120937&aid=1473773&group_id=20937