public JToken CreateProof(CreateProofOptions options, JsonLdProcessorOptions processorOptions)
{
var(document, proofs) = options.Document.GetProofs(processorOptions);
var proof = new BbsBlsSignature2020(proofs.FirstOrDefault() ?? throw new Exception("Proof not found"));
proof.Context = Constants.SECURITY_CONTEXT_V2_URL;
var signature = Convert.FromBase64String(proof.ProofValue);
var derivedProof = JsonLdProcessor.Compact(new BbsBlsSignatureProof2020(), Constants.SECURITY_CONTEXT_V2_URL, processorOptions);
var documentStatements = BbsBlsSignature2020Suite.CreateVerifyDocumentData(document, processorOptions);
var proofStatements = BbsBlsSignature2020Suite.CreateVerifyProofData(proof, processorOptions);
var transformedInputDocumentStatements = documentStatements.Select(TransformBlankNodeToId).ToArray();
var compactInputDocument = Helpers.FromRdf(transformedInputDocumentStatements);
var revealDocument = JsonLdProcessor.Frame(compactInputDocument, options.ProofRequest, processorOptions);
var revealDocumentStatements = BbsBlsSignature2020Suite.CreateVerifyDocumentData(revealDocument, processorOptions);
var numberOfProofStatements = proofStatements.Count();
var proofRevealIndicies = EnumerableFromInt(numberOfProofStatements).ToArray();
var documentRevealIndicies = revealDocumentStatements.Select(x => Array.IndexOf(transformedInputDocumentStatements, x) + numberOfProofStatements).ToArray();
if (documentRevealIndicies.Count() != revealDocumentStatements.Count())
{
throw new Exception("Some statements in the reveal document not found in original proof");
}
var revealIndicies = proofRevealIndicies.Concat(documentRevealIndicies);
derivedProof["nonce"] = options.Nonce ?? Guid.NewGuid().ToString();
//Combine all the input statements that
//were originally signed to generate the proof
var allInputStatements = proofStatements.Concat(documentStatements);
var verificationMethod = BbsBlsSignature2020Suite.GetVerificationMethod(proofs.First(), processorOptions);
var outputProof = BbsProvider.CreateProof(new CreateProofRequest(
publicKey: verificationMethod.ToBlsKeyPair().GeyBbsKeyPair((uint)allInputStatements.Count()),
messages: GetProofMessages(allInputStatements.ToArray(), revealIndicies).ToArray(),
signature: signature,
blindingFactor: null,
nonce: derivedProof["nonce"].ToString()));
// Set the proof value on the derived proof
derivedProof["proofValue"] = Convert.ToBase64String(outputProof);
// Set the relevant proof elements on the derived proof from the input proof
derivedProof["verificationMethod"] = proof["verificationMethod"];
derivedProof["proofPurpose"] = proof["proofPurpose"];
derivedProof["created"] = proof["created"];
revealDocument["proof"] = derivedProof;
return(revealDocument);
}
public void FullDemoTest()
{
var key = BbsProvider.GenerateBlsKey();
var publicKey = key.GeyBbsKeyPair(5);
var nonce = "123";
var messages = new[]
{
"message_1",
"message_2",
"message_3",
"message_4",
"message_5"
};
{
// Sign messages
var signature = BbsProvider.Sign(new SignRequest(key, messages));
Assert.NotNull(signature);
Assert.AreEqual(BbsProvider.SignatureSize, signature.Length);
// Verify messages
var verifySignatureResult = BbsProvider.Verify(new VerifyRequest(key, signature, messages));
Assert.True(verifySignatureResult);
// Create proof
var proofMessages1 = new[]
{
new ProofMessage {
Message = messages[0], ProofType = ProofMessageType.Revealed
},
new ProofMessage {
Message = messages[1], ProofType = ProofMessageType.Revealed
},
new ProofMessage {
Message = messages[2], ProofType = ProofMessageType.Revealed
},
new ProofMessage {
Message = messages[3], ProofType = ProofMessageType.Revealed
},
new ProofMessage {
Message = messages[4], ProofType = ProofMessageType.Revealed
}
};
var proofResult = BbsProvider.CreateProof(new CreateProofRequest(publicKey, proofMessages1, signature, null, nonce));
Assert.NotNull(proofResult);
// Verify proof of revealed messages
var indexedMessages1 = new[]
{
new IndexedMessage {
Message = messages[0], Index = 0u
},
new IndexedMessage {
Message = messages[1], Index = 1u
},
new IndexedMessage {
Message = messages[2], Index = 2u
},
new IndexedMessage {
Message = messages[3], Index = 3u
},
new IndexedMessage {
Message = messages[4], Index = 4u
}
};
var verifyResult1 = BbsProvider.VerifyProof(new VerifyProofRequest(publicKey, proofResult, indexedMessages1, nonce));
Assert.AreEqual(SignatureProofStatus.Success, verifyResult1);
}
// Create blinded commitment
var blindedMessages = new[]
{
new IndexedMessage {
Index = 0, Message = messages[0]
}
};
var commitment = BbsProvider.CreateBlindedCommitment(new CreateBlindedCommitmentRequest(publicKey, blindedMessages, nonce));
Assert.NotNull(commitment);
// Verify blinded commitment
var verifyResult = BbsProvider.VerifyBlindedCommitment(new VerifyBlindedCommitmentRequest(publicKey, commitment.BlindSignContext.ToArray(), new [] { 0u }, nonce));
Assert.AreEqual(SignatureProofStatus.Success, verifyResult);
// Blind sign
var messagesToSign = new[]
{
new IndexedMessage {
Index = 1, Message = messages[1]
},
new IndexedMessage {
Index = 2, Message = messages[2]
},
new IndexedMessage {
Index = 3, Message = messages[3]
},
new IndexedMessage {
Index = 4, Message = messages[4]
}
};
var blindedSignature = BbsProvider.BlindSign(new BlindSignRequest(key, publicKey, commitment.Commitment.ToArray(), messagesToSign));
Assert.NotNull(blindedSignature);
Assert.AreEqual(BbsProvider.BlindSignatureSize, blindedSignature.Length);
// Unblind signature
var unblindedSignature = BbsProvider.UnblindSignature(new UnblindSignatureRequest(blindedSignature, commitment.BlindingFactor.ToArray()));
Assert.NotNull(unblindedSignature);
Assert.AreEqual(BbsProvider.SignatureSize, unblindedSignature.Length);
// Verify signature
var verifyUnblindedSignatureResult = BbsProvider.Verify(new VerifyRequest(key, unblindedSignature, messages));
Assert.True(verifyUnblindedSignatureResult);
// Create proof
var proofMessages = new[]
{
new ProofMessage {
Message = messages[0], ProofType = ProofMessageType.Revealed
},
new ProofMessage {
Message = messages[1], ProofType = ProofMessageType.Revealed
},
new ProofMessage {
Message = messages[2], ProofType = ProofMessageType.HiddenExternalBlinding
},
new ProofMessage {
Message = messages[3], ProofType = ProofMessageType.HiddenExternalBlinding
},
new ProofMessage {
Message = messages[4], ProofType = ProofMessageType.HiddenExternalBlinding
}
};
var proof = BbsProvider.CreateProof(new CreateProofRequest(
publicKey: publicKey,
messages: proofMessages,
signature: unblindedSignature,
blindingFactor: commitment.BlindingFactor.ToArray(),
nonce: nonce));
Assert.NotNull(proof);
Assert.True(proof.Length > 0);
// Verify proof
var indexedMessages = new[]
{
new IndexedMessage {
Message = messages[0], Index = 0u
},
new IndexedMessage {
Message = messages[1], Index = 1u
}
};
var verifyProofResult = BbsProvider.VerifyProof(new VerifyProofRequest(publicKey, proof, indexedMessages, nonce));
Assert.AreEqual(SignatureProofStatus.Success, verifyProofResult);
}