In CTR mode, the IV is being used as the initial counter value. If you want to use a initial counter value of 0, pass in a NULL pointer for the IV. And yes, IV size is still the size of the cipher block.
On Thu, Jun 19, 2003 at 03:36:46PM +0200, [EMAIL PROTECTED] wrote: > A little question about CTR mode. > According to what I read in the NIST Special Publication 800-38A (describind > cipher modes), no IV is needed to perform CTR cipher. But using encryption > objects in CTR mode with different IV does not give the same results with > CryptoPP : it seems like the IV used to initialize the object really > matters. > > Is there anything I did not understand ? Or is there an IV with the same > size as the block, like in CFB, CBC and OFB ? > > Regards, > > -- > C�dric Mallet
