What is certificate chain in OpenSSL?

How do I view cert details in OpenSSL?

I am using OpenSSL 1.

0.1f 6 Jan 2025, but I am not able to see the details of certificates that I create in OpenSSL.

I am creating a certificate request, and then sending it to the CA to sign and create a new certificate. When I view the certificate using openssl tool, the certificate is not present.

Openssl req -newkey rsa:4096 -nodes -keyout /opt/certificates/certificate.key -config /opt/certificates/certificate.conf -out /opt/certificates/certificate.csr

But when I create a new certificate, and then view it using openssl tool, the certificate is present. Openssl x509 -in certificate.csr -text Any help is appreciated. Openssl req -inform PEM -outform DER -newkey rsa:4096 -nodes -keyout /opt/certificates/certificate.csr The -inform and -outform options control the input and output formats of the certificate request. If you omit them, then the defaults are used. The default PEM format includes headers, which can be confusing if you are unfamiliar with PEM format. If you wish to omit these headers, use DER format. If you want to specify custom headers, use any of the following formats:
headers myheaders.txt -attrfile myattrs.txt -certfile mycert.pem -certinfofile mycertinfo.pem -version myversion.pem In addition, the format of the output will depend on the command line options. If you omit -outform, then the default format is used. If you specify -outform DER, then the DER format will be used. If you specify any of the other forms listed above, then the form specified will be used.

I am assuming that you are using OpenSSL v1.1f or newer.

The command you posted should work.

How to use OpenSSL to check certificate?

I have a web server running a simple website on a Debian server.

And I want to use OpenSSL to check whether the site is secured or not (by using SSL).

I have successfully used OpenSSL to sign the key for the server. And then when I checked the file, it has my secret key in it. But, how do I know if it is an insecure website? (and what is the best method to do that). When you check SSL certificates, you are trying to establish trust. I'm going to try and explain how to use OpenSSL to do that. You will want to use the -nodes option to avoid all kinds of heartache.

First, some OpenSSL commands. Openssl genrsa -out server.key 2025 # generate server key openssl req -new -nodes -key server.key # create certificate request openssl req -text # list out the request. Openssl x509 -req -days 365 -in certreq.csr # sign the request openssl rsa -in server.key # dump private key Now you are ready to do the SSL check. Openssl sclient -connect www.example.com:443 -cert certreq.

How to check chain certificate?

I bought a certificate chain from this seller.

I do not know what is right or wrong. How can I check it? The certificate is not good, it has a signature that looks odd, and the certificate says "3.0.14". The version number is higher than 3.

Also, if this is a business grade certificate, it should use TLS 1.2, not SSL 1.0, and contain Extended Key Usages. I'm not surprised that the certificate vendor doesn't offer their products as verified identity, that would be too expensive.

Certificate problems like this happen all the time, the certificate vendor should get that fixed.