private void doIssuanceProtocol(
IssuerAbcEngine issuerEngine,
UserAbcEngine userEngine,
IssuancePolicy ip,
List<Attribute> issuerAtts)
throws Exception {
// Initialize ABC4Trust Issuance Protocol Issuer side
// Returns an IssuancePolicy from CryptoEngineIssuer to be passed to CryptoEngineUser
// initialization
IssuanceMessageAndBoolean issuerIm = issuerEngine.initIssuanceProtocol(ip, issuerAtts);
assertFalse(issuerIm.isLastMessage());
// Initialize ABC4Trust Issuance Protocol Prover side
// FIXME: userEngine indirectly calls CryptoEngineUser.createIssuanceToken() with the
// IssuancePolicy from the Issuer and returns an IssuanceToken
// contained in the IssuanceMessage. This IssuanceToken is simply NOT used for now in the next
// step of the UProve Credential Issuance protocol.
// However, this seems to be the only proper way for now to initialise CryptoEngineUser to a
// working state, despite the createIssuanceToken() step being
// an optional step for the advanced Issuance setting not supported by UProve for now.
IssuMsgOrCredDesc userIm = userEngine.issuanceProtocolStep(issuerIm.getIssuanceMessage());
// Execute the UProve issuance protocol:
// Prover side asks issuer for first message
issuerIm = issuerEngine.issuanceProtocolStep(userIm.im);
assertFalse(issuerIm.isLastMessage());
// Prover side generates second message based on the first message
userIm = userEngine.issuanceProtocolStep(issuerIm.getIssuanceMessage());
// Prover side asks issuer for third message based on the second message
assertNotNull(userIm.im);
issuerIm = issuerEngine.issuanceProtocolStep(userIm.im);
assertNotNull(issuerIm.getIssuanceMessage());
// Prover side generates UProve Tokens based on the third message
userIm = userEngine.issuanceProtocolStep(issuerIm.getIssuanceMessage());
boolean userLastMessage = (userIm.cd != null);
assertTrue(issuerIm.isLastMessage() == userLastMessage);
assertNull(userIm.im);
assertNotNull(userIm.cd);
// CredentialDescription actualCredDesc = userIm.cd;
// ObjectFactory of = new ObjectFactory();
// String actualCredentialDesc =
// XmlUtils.toNormalizedXML(of.createCredentialDescription(actualCredDesc));
// System.out.println(actualCredentialDesc);
}
