PHP producer/consumer libraries?

[meepbear *]

>I know Philip Pearson had produced a PHP library for OpenID which  
>supported the old DSA protocol, but has anyone made progress on a PHP  
>library for the new DH/HMAC protocol?

You can generate an HMAC-SHA1 without depending on the mhash extension but 
since I can't seem to find a 'pure' PHP big integer library anywhere, your 
host will have to support the GMP extension (or BCMath but it's a pain since 
it's not capable enough) or you need the ability to compile and run your own 
PHP on your host.

DH isn't required though so even if a consumer asks for it, you can just 
ignore it and do it the non-DH way.