How do I get the proper pem format from .jks file to sign the jwt token?

[nunulong]

Hi, I am trying to use the .jks file to sign the jwt token. The libraries I am using are pyjwt and pyjks. Below is the code snippets:

        userDto = user
        payload = {
            "iss": "test",
            "exp": datetime.now(tz=timezone.utc) + timedelta(days=365),
            "iat": datetime.now(tz=timezone.utc),
            "nbf": datetime.now(tz=timezone.utc),
            "sub": "testUser",
            "auth": userDto
        }
        keystorePath = os.path.abspath("KeyStore.jks")
        keystorePass = "test"
        keyAlias = "test"
        keystore = jks.KeyStore.load(keystorePath, keystorePass)
        pk = keystore.private_keys[keyAlias]

        encoded = jwt.encode(payload, pk, algorithm="RS512")

While executing the last line of code to generate the jwt using jks signature, it throws error saying expecting a PEM-formatted key. I am thinking the pk format is not what the jwk requires. My question is how I could extract pem file formatted file from .jks to sign the jwk token? Thanks.

[anishnath]

faced simmilar issue tried converting jwk to pem using https://8gwifi.org/jwkconvertfunctions.jsp the problem still persists