crypto implementation for small footprint devices

[Gé Weijers]

On Tue, Jan 09, 2001 at 03:42:45PM -0800, Xiao, Peter wrote:
> Hi,
> 
> I am currently looking for crypto implementation that can fit into small
> footprint (in the order of 50K or less) devices. Ideally, an SSL type of
> protocol meets my requirements but it is almost impossible to implement it
> within 50K even with selected cipher suites. So, I am looking for
> alternatives (either symmetric key or public key based). I was thinking
> about WTLS but looks like its implementation can not be significantly
> smaller than that of TLS since it is also based on Public Key cryptography
> (I am wondering how it fits into a cellphone). Can any one tell me what is
> the approximate size of the client implementation of WTLS. Also, would
> anyone send some pointers to me regarding what I am looking for.
> 
> Thanks in advance!!
> 
> Peter

It's not the public-key operations themselves that use the space. I've
managed to squeeze OAEP-formatted RSA encryption into less than
20K. The public key was hard-wired, though. You probably want to stay
away from ASN.1 formatted data if space is a concern.

Gé

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