Token verification fails for azure ad JWT public key about jwt-cpp HOT 3 CLOSED

Can you post a copy of the public key you are trying to load?
Make sure it is a valid PEM Key.
It should look similar to the one here:
https://github.com/Thalhammer/jwt-cpp/blob/master/TokenTest.cpp#L349

from jwt-cpp.

It was x.509 base64 encoded certificate file, started with -----BEGIN CERTIFICATE----- and ended with -----END CERTIFICATE-----. I got that cer file from Azure AD single signon app's SAML signing certificate.

I figured out the issue later on. I had to extract the public key first from the certificate file. Then had to use that public key for signature verification. I did that and it worked fine. I had to use following openssl command to extract the public key:

openssl x509 -pubkey -noout -in PublicCertificate.cer > public-key.pub

It solved the issue for me.

Is there any functionality in this app which can be used to do this conversion?

from jwt-cpp.

Well you already need to link in openssl anyway, so it should not be a problem to replicate the functionality in the command line tool.
I did not test it, but this should guide you in the right direction I think:
http://fm4dd.com/openssl/certpubkey.htm

from jwt-cpp.