protected byte[] verifySignature(final String token, final PublicJsonWebKey jsonWebKey) {
        return EncodingUtils.verifyJwsSignature(jsonWebKey.getPublicKey(), token);
    }
Gets allowed signing algorithms.
Returning an empty collection indicates that all algorithms should be supported, except none.

@param registeredService the svc
@return the allowed signing algorithms
support/cas-server-support-oauth-core-api/src/main/java/org/apereo/cas/ticket/BaseTokenSigningAndEncryptionService.java