SSL : How to check if current certificate is sha1 or sha2 from command line
Problem :
You want to check if a website SSL certificate is sha1 or sha2 algorithm from command line.
Solution :
Assuming your are running a *nix based OS like OSX or Linux with OpenSSL installed.
This is the openssl command to check your website certificate from the command line :
> openssl s_client -connect www.yoursite.com:443 < /dev/null 2>/dev/null | openssl x509 -text -in /dev/stdin | grep "Signature Algorithm"
the result should look like
Signature Algorithm: sha1WithRSAEncryption for sha1
and
Signature Algorithm: sha256WithRSAEncryption for sha2
See also : SSL : How to check if current certificate is sha1 or sha2
By Adam Ng
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