Re: draft-yoon-pkix-wireless-internet-00.txt

["Housley, Russ" <rhousley@xxxxxxxxxxxxxxx>]

Jaeho:

I just want to reply to one small part of your message.

You said:
> We had to consider the size of ASN.1 run-time library and its actual code 
> size and processing time including key generation in mobile devices. We 
> just have maximum 150Kbyte in a brand-new mobile phone. And it was nearly 
> impossible to make a partial revision of commercial ASN.1 product without 
> manufacturer’s (OSS etc.) assistance. So we tested not an ASN.1 but 
> different methods again and again. Fortunately, we ported the PKI 
> application at mobile devices and have finished testing it. Now, We are 
> ready to launch the service.

I have experience with ASN.1 data structures limited processing 
environments, specifically smart cards.  In this environment, we did could 
not use a general purpose toolkit for the reasons that you discuss 
above.  However, we found that there were very few ASN.1 data structures 
that actually needed to be processed in the limited processing 
environment.  In some cases, only decoders were needed.  In other case, 
only encoders were needed.  In very few cases, both encoders and decoders 
were needed.  Therefore, we simply wrote code for the structures that we 
cared about.  The resulting structure-specific code was very small, and it 
had no burdensome run-time requirements (like large tables).  It appears to 
me that similar code could be used to implement the ASN.1 structures that 
your draft proposes to eliminate.

Russ