Error with method sign for String

[jmjurado23]

The error is:
undefined method `sign' for #String:0x00000002fbbb78

In line:
def sign_rsa(algorithm, msg, private_key)
private_key.sign(OpenSSL::Digest.new(algorithm.sub('RS', 'sha')), msg)
end

In file: jwt.rb 35

String class (private_key) not have sign method.

What is the problem?

[excpt]

Can you please provide example code? It looks like the RSA key is no present.

[jmjurado23]

The code is simply,

pem = '-----BEGIN RSA PRIVATE KEY----- MIKCAQEAiqv0K2dMkuLyuZQiw4j8r7VQjP3zS+nUDgu80tfYA3usRGxx G8DmQDBWIi6MOj80K7nm0f+QcVaztN6NVgw07XaEg8sJ Yg16qULCO4nUhWcVnOaA1YdUC6bZ/DcA pfzPCDEpXT6Nwbj5uJs .... ----- END RSA PRIVATE KEY -----'
params = {
''body": 'example'
}

JWT.encode( params, pem, 'RS256')

And this give me the error, look like String class not have sign method

[jmjurado23]

I've discovered the error, key should be a OpenSSL::PKey::RSA instance.

Sorry for inconvenences.

[excpt]

Okay. But I think to improve the experience working with ruby jwt a better error should be displayed.

"The given key is a #{private_key.class}. It has to be an OpenSSL::PKey::RSA instance."