Hi, take a look at GCM_Base::GCTR in gcm.h. It does what you want, but is a
protected member of GCM_Base, so just copy its code.
--------------------------------------------------
From: "Jan" <
honza.smrcek@...>
Sent: Tuesday, June 16, 2009 2:40 AM
To: "Crypto++ Users" <
cryptopp-users@...>
Subject: AES/CTR IV custom increment
>
> Hello,
>
> I am trying to implement AES in CTR mode but with the custom IV
> increment. CryptoPP implementation increments IV over the whole vector
> but I would like to have increment only over the lowest 4 bytes (with
> modulo).
>
> E.g. 00 .... AB FF FF FF FE -> 00 .... AB FF FF FF FF -> 00 .... AB 00
> 00 00 00
>
> Is there any easy way how to do it? Only solution which I currently
> found is to increment IV by myself after each block and then call
> Resynchronize and then encrypt another block.
>
> Thank you for your help,
> Jan
>
> >
>
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