The RS256 example just Puzzled me.

[miko-cn]

The RS256 example in the readme file can run in my runtime:

• OpenSSL Library Version: OpenSSL 1.0.2k 26 Jan 2017
• PHP version: 7.1.9
• API Framework: ThinkPHP 5.0

$jwt = JWT::encode($token, $privateKey, 'RS256');
$decoded_before_expired = JWT::decode($jwt, $publicKey, array('RS256'));

But when I try to use RS512 publicKey/privateKey in the example without any changes in the code, it just run as perfect as with the RS256 keys of the example which means I still use the RS256 mode to encode and decode my jwt!

And when I try to use RS512 mode in the example code like this:

$jwt = JWT::encode($token, $privateKey, 'RS512');
$decoded_before_expired = JWT::decode($jwt, $publicKey, array('RS512'));

The php framework just told me:

DomainException in JWT.php line 201
OpenSSL unable to sign data

        }
        list($function, $algorithm) = static::$supported_algs[$alg];
        switch($function) {
            case 'hash_hmac':
                return hash_hmac($algorithm, $msg, $key, true);
            case 'openssl':
                $signature = '';
                $success = openssl_sign($msg, $signature, $key, $algorithm);
                if (!$success) {
                    throw new DomainException("OpenSSL unable to sign data");
                } else {
                    return $signature;
                }
        }
    }

    /**
     * Verify a signature with the message, key and method. Not all methods
     * are symmetric, so we must have a separate verify and sign method.

All fine in the RS256 mode, did I misunderstand something here?

[ronaldroe]

I encountered this same problem, but mine wouldn't work with any RS algos. I was using a variable to hold the key as a string in the code just for testing. I eventually decided to bring it in from file, as I was planning to do later, and doing it that way worked.

[yash30201]

More reference may be taken from: https://dev.to/adhocore/minimalist-yet-powerful-php-jwt-library-2f5l

Closing as this seems answered.