openssl ocsp -respin resp.der -text
openssl ocsp -index demoCA/index.txt -port 8888 -rsigner rcert.pem -CA demoCA/cacert.pem
openssl ocsp -issuer issuer.pem -cert c1.pem -cert c2.pem \
openssl ocsp -index demoCA/index.txt -rsigner rcert.pem -CA demoCA/cacert.pem
openssl ocsp -issuer issuer.pem -cert c1.pem -cert c2.pem -reqout req.der