Some command lines that may be useful if you want to implement an OpenID identity server or consumer:

openssl dsaparam 1024 < /dev/random > dsaparam.pem openssl gendsa dsaparam.pem -out dsa_priv.pem openssl dsa -in dsa_priv.pem -pubout -out dsa_pub.pem echo “foobar” > foo.txt sha1sum < foo.txt | awk ‘{print $1}’ > foo.sha1 openssl dgst -dss1 -sign dsa_priv.pem foo.sha1 > sigfile.bin openssl dgst -dss1 -verify dsa_pub.pem -signature sigfile.bin foo.sha1

With any luck I’ll have some PHP code available soon for the server side …