Listing and Verifying SSL Certificate using openssl

How to check the private key

Using openssl command,

# openssl rsa -in myserver.key -check -noout
RSA key ok

How to check SSL certificate (*.crt format) using openssl command

Using openssl command

 # openssl x509 -in myserver.crt -text -noout | more

To get only the validity dates

 # openssl x509 -in myserver.crt -text -noout | grep "Not"
            Not Before: Apr 24 14:35:54 2010 GMT
            Not After : Jul 27 04:17:47 2011 GMT

How to check SSL certificate (*.cer format)

Using openssl command,

 # openssl x509 -inform der -in myserver.cer -text | more 

To get only the validity dates,

 # openssl x509 -inform der -in myserver.cer -text | grep "Not"
            Not Before: Nov 14 05:44:26 2008 GMT
            Not After : Nov 14 05:54:26 2010 GMT