I get an access token from Microsoft Identity Platform and I try to verify its signature (to understand the process of validation) using jwt.io website. The thing is when I paste this access token on jwt.io website and paste the public key on the « public key » box, jwt.io is still returning an error, stating the signature is invalid. The public key I am using is given by Microsoft Identity using the « kid » claim. To be more precise I take the public key and wrap it with « ——BEGIN CERTIFICATE—- » and « —-END CERTIFICATE—- » and paste it all on the public key box. ( By the way, on the private key box I put nothing) What am I doing wrong ? Thank you for all your help.
Why jwt.io website is giving an error for validating a token?
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Here is a working manual JWT validation to compare against, from my Azure AD development account. Hopefully this enables you to solve your own problem, and also highlights the steps many API security libraries follow:
JWT ACCESS TOKEN
KID VALUE FROM JWT HEADER
2ZQpJ3UpbjAYXYGaXEJl8lV0TOI
JWKS URI
The JSON Web Keyset containing token signing public keys is downloaded from here:
https://login.microsoftonline.com/7f071fbc-8bf2-4e61-bb48-dabd8e2f5b5a/discovery/v2.0/keys
TOKEN SIGNING PUBLIC KEY (JWK FORMAT)
This is the item in the keyset that matches the
kidfield from the JWT header. You can paste this JSON into the public key text field in jwt.io and the JWT will pass validation:TOKEN SIGNING PUBLIC KEY (PEM FORMAT)
You can use a JWK to PEM converter to convert the JWK to PEM format. You can paste this certificate text into the public key text field in jwt.io and the JWT will also pass validation: