What is the command for OpenSSL s_client?

m What is the syntax for doing the same thing with Windows CMD?

I had a similar situation and this worked for me. You need to install an additional sserver.bat script on your windows box that sets up the SSL environment for you.

Download script: source script: add the script to the c:opensslbin directory. Copy a copy of the sclient.bat script you would like to use on the windows machine run a test: C:> C:opensslbinsserver.bat 443 SENT TLSv1 ALERT: fatal, badcertificate. ADDITIONAL NOTES: No client certificate CA names sent to server.U

How to check certificate signing algorithm in OpenSSL?

I am trying to find out what algorithm the certificate is using for signing my certificates.

I can not find any way to check this. Does anybody know how to check that? I have already checked the signature of the certificate in my openssl and it matches the signature of the original certificate.

The most common algorithm is RSA-SHA1, and is used to sign X.509 certificates.

Openssl x509 -text -inform PEM -in . If the output says RSASSA-PSS-SHA1 then it is RSA-SHA1. It's RSA-SHA1. You can check by running openssl x509 -inform pem -in foo.pem -noout -text Example output: Certificate: Data: Version: 3 (0x2). Serial Number: 1a:c4:3d:12:d6:15:7d:b6:a5:e1:8d:6e:8c:da:a3:14:1a. Signature Algorithm: sha1WithRSAEncryption. Issuer: C=US, O=VeriSign, Inc., OU=VeriSign Trust Network, OU=Terms of use at (c)10, CN=VeriSign Class 3 Secure Server CA - G2 Validity. Not Before: Jul 5 14:56:55 2025 GMT. Not After : Jun 15 14:56:55 2025 GMT. Subject: C=US, O=VeriSign, Inc.