How do I check if my SSL Certificate is SHA1 or SHA2 on the commandline

Question

How do I check if my SSL Certificate is using SHA1 or SHA2, from the commandline?

And yes, i this is similar to this, but i need a cli-tool and i want to understand how

Answer 1

after googling for quite some time i came up with the following snippet (unix):

openssl s_client -connect <host>:<port> < /dev/null 2>/dev/null | openssl x509 -text -in /dev/stdin | grep "Signature Algorithm"

windows (thanx Nick Westgate, see below)

certutil -dump cacert.pem | find "Algorithm"

Answer 2

You didn't specify a platform, but in a Windows command prompt you can use:

certutil -dump cacert.pem | find "Algorithm"

Answer 3

In PowerShell

PS C:\> certutil -dump cacert.pem | findstr "Algorithm"

Answer 4

I know the topic is old but I think

openssl x509 -in yourcert.crt -text -noout | grep "Signature Algorithm"

would be an easier solution.