private SigningSignatureHandler getSigner() throws Exception {
InputStream keyStream = new ByteArrayInputStream(Certificates.EXAMPLE_PRIVATE_KEY.getBytes());
InputStream certStream = new ByteArrayInputStream(Certificates.EXAMPLE_CERTIFICATE.getBytes());
List<InputStream> certStreams = ImmutableList.of(certStream);
WaveSignerFactory factory = new WaveSignerFactory();
WaveSigner signer = factory.getSigner(keyStream, certStreams, CertificateManagerImplTest.DOMAIN);
return new SigningSignatureHandler(signer);
}