presto-main/src/main/java/io/prestosql/server/security/JsonWebTokenAuthenticator.java/StaticKeyLoader/apply
class StaticKeyLoader:        @Override
        public Key apply(JwsHeader<?> header)
        {
            SignatureAlgorithm algorithm = SignatureAlgorithm.forName(header.getAlgorithm());
            return key.getKey(algorithm);
        }