p12->pemcer.p12: openssl pkcs12 -clcerts -nokeys -out cer.pem -in cer.p12key.p12: openssl pkcs12 -nocerts -out key.pem -in key.p12合: cat cer.pem key.pem > cer_key.pempem -> p12openssl pkcs12 -export -in apns_dev.pem -out paypal.p12