Symmetric cipher padding?
mo at g10code.com
Tue Mar 22 21:48:26 CET 2005
On Mon, Mar 21, 2005 at 08:27:38PM +1100, Brad Hards wrote:
> 1. I've been working on the assumption that if I pass more than
> block size bytes to gcry_cipher_encrypt(), then libgcrypt will
> buffer the residual bytes.
Where did you base this assumption on? Libgcrypt does not buffer such
data for you - the library is a low-level library - keep this in mind.
> 2. Is there anything that I can use to help with the padding? For example,
> does libgcrypt keep track of how many bytes have been encrypted already?
There is no such counter.
> 3. Is there any special support for CTS? (or, can I have a hint please :)
CTS is supported. If you enable it, you can transform chunks of data,
whose size does not have to be a multiple of the block size (it only
needs to be larger than a single block).
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