private static function sign($input, $key, $algo)
{
switch ($algo) {
case 'HS256':
return hash_hmac('sha256', $input, $key, true);
case 'HS384':
return hash_hmac('sha384', $input, $key, true);
case 'HS512':
return hash_hmac('sha512', $input, $key, true);
case 'RS256':
return JWT::generateRSASignature($input, $key, OPENSSL_ALGO_SHA256);
case 'RS384':
return JWT::generateRSASignature($input, $key, OPENSSL_ALGO_SHA384);
case 'RS512':
return JWT::generateRSASignature($input, $key, OPENSSL_ALGO_SHA512);
default:
throw new Exception("Unsupported or invalid signing algorithm.");
}
}