[ pycrypto-Bugs-2070522 ] Encryption modes not functioning properly

Bugs item #2070522, was opened at 2008-08-24 00:56
Message generated for change (Comment added) made by nobody
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Encryption modes not functioning properly

Initial Comment:
Modes of encryption/decryption other than 1 and 4 do not seem to function properly for any of the various ciphers in the toolkit. It seems to be the first block which comes out incorrect but mode 5 does not function at all. Example:
plain = 
'Block001Block002Block003Block004Block005
Block006Block007Block008Block009Block010'
for x in range(1,6):
...     AESobj = AES.new('1234567812345678',x)
...     ciph = AESobj.encrypt(plain)
...     AESobj.decrypt(ciph)
        print ""
...
'Block001Block002Block003Block004Block005
Block006Block007Block008Block009Block010'

'\xf6\x8c5n\xcc\xc2\x12\x840p\xd3,\xe2\xac{\xe5Block003Block004Block005
Block006Block007Block008Block009Block010'

'( -\xd7\xa6\n\x0f\xaa\x14]\xa203b\x9eBlock003
Block004Block005Block006Block007Block008
Block009Block010'

'L\x17\xd0\x93\x9b\x8ad\xe7Block002Block003Block004
Block005Block006Block007Block008Block009Block010'

'\x06\x83\xd1KwZ\xd0\x0bn\x88\x1cc\xcd\x99yV\xc4\x15\xdc\x8b\xf8\xd3\x7f8\xd8 \xdaj\xa8\x05\xb2\x86_UG\xe0#\xad\xc8d\xe5E\xb3\xa2io\x00B&\xab\x85\xac\xbdT\xb5m\xa2S#\xbb7\x8c\xad\xe4\xe6D\xbd<\x83C|V\xd4D[\xdd\xf3\x82'

Also, I get memory errors when setting RC5 rounds to higher than 49. 
Example 1:
>>> RC5obj = RC5.new('123456781234567812345678',1,rounds=100)
Segmentation fault
Example 2:
>>> RC5obj = RC5.new('123456781234567812345678',3,rounds=255)
*** glibc detected *** python: malloc(): memory corruption: 0x000000000080c050 ***
Also, AllOrNothing protocol produces some list entries that are only 7 bytes instead of 8 and so the undigest operation always fails.

Sorry if this is some error in implementation on my part I'm new to programming/cryptography/Linux. Also just to note the example usages at www.amk.ca use a different format to specify the mode than the toolkit demanded of me in practice (accepting only an integer). I have tried installations both through the Adept Package manager and as installed by the scripts available at amk.ca with the same results.
Thanks, Edward John Carscallen [email protected]

----------------------------------------------------------------------

Comment By: Nobody/Anonymous (nobody)
Date: 2008-08-24 01:03

Message:
Logged In: NO 

Perhaps I should have mentioned I am using Kubuntu and python 2.5.2 with
an AMD64 system if this could be the cause of my errors.

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