41+ Openssl Validate Certificate Background. To validate a certificate agains a certificate authority you just have extract signature from certificate # run the following and get the last bit position openssl. Timestamp is the number of seconds since.
$ openssl verify cert.pem cert.pem: To validate this certificate, the client must have the intermediate ca. It can be useful to check a certificate and key before applying them to your server.
Timestamp is the number of seconds since.
Openssl will allow you to look at it if it is installed on your system, using the openssl x509 tool. These commands allow you to generate csrs, certificates, private keys and do other miscellaneous tasks. On windows you run windows certificate manager program using certmgr.msc command in the run. Also, see this page has some excellent examples.