private Element createSAMLAssertion(
String tokenType, Crypto crypto, String signatureUsername, CallbackHandler callbackHandler)
throws WSSecurityException {
TokenProvider samlTokenProvider = new SAMLTokenProvider();
TokenProviderParameters providerParameters =
createProviderParameters(
tokenType, STSConstants.BEARER_KEY_KEYTYPE, crypto, signatureUsername, callbackHandler);
TokenProviderResponse providerResponse = samlTokenProvider.createToken(providerParameters);
assertTrue(providerResponse != null);
assertTrue(providerResponse.getToken() != null && providerResponse.getTokenId() != null);
return providerResponse.getToken();
}