private RSAPublicKey getPublicRsaKey(String publicKey){
        RSAPublicKey rsa = null;
        try {
            rsa = (RSAPublicKey) PemUtils.decodePublicKey(publicKey);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return rsa;
    }
@author Marc Savy {@literal <msavy@redhat.com>}
plugins/jwt-policy/src/test/java/io/apiman/plugins/jwt/JWTPolicyTest.java