[Bug crypto/27849] getIV() call on cipher for DESede/CBC returns null

[raif at swiftdsl dot com dot au]

------- Comment #5 from raif at swiftdsl dot com dot au  2006-06-11 06:50 
-------
two comments regarding the patch:

* all modes, except for ECB, require or use an IV.
* although, strictly speaking, not passing an IV to a mode, other than ECB, is
an error, generating a random one is not always a good option.  consider the
case where you instantiate, and initialize 2 ciphers with the same
transformation and initialization parameter;  if the IV is random, you will not
be able to decrypt with one, what the other has encrypted.  on the other hand,
using a constant value IV --e.g. all zeroes-- is an acceptable alternative.


-- 

raif at swiftdsl dot com dot au changed:

           What    |Removed                     |Added
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                 CC|                            |raif at swiftdsl dot com dot
                   |                            |au


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27849