public IdemixSetup(string[] attributeNames)
{
// Choose attribute names and create an issuer key pair
// this.attributeNames = new String[]{"Attribute1", "Attribute2"};
this.attributeNames = attributeNames;
key = new IdemixIssuerKey(this.attributeNames);
RAND rng = IdemixUtils.GetRand();
// Choose a user secret key and request a credential
sk = new BIG(rng.RandModOrder());
issuerNonce = new BIG(rng.RandModOrder());
idemixCredRequest = new IdemixCredRequest(sk, issuerNonce, key.Ipk); //csr
// Issue a credential
attrs = new BIG[this.attributeNames.Length];
for (int i = 0; i < this.attributeNames.Length; i++)
{
attrs[i] = new BIG(i);
}
idemixCredential = new IdemixCredential(key, idemixCredRequest, attrs); //certificate
wbbKeyPair = WeakBB.WeakBBKeyGen();
// Generate a revocation key pair
revocationKeyPair = RevocationAuthority.GenerateLongTermRevocationKey();
// Check all the generated data
CheckSetup();
}
private void Test()
{
RAND rng = IdemixUtils.GetRand();
// WeakBB test
// Random message to sign
BIG wbbMessage = rng.RandModOrder();
// Sign the message with keypair secret key
ECP wbbSignature = WeakBB.WeakBBSign(setup.wbbKeyPair.Sk, wbbMessage);
// Check the signature with valid PK and valid message
Assert.IsTrue(WeakBB.weakBBVerify(setup.wbbKeyPair.Pk, wbbSignature, wbbMessage));
// Try to check a random message
Assert.IsFalse(WeakBB.weakBBVerify(setup.wbbKeyPair.Pk, wbbSignature, rng.RandModOrder()));
// user completes the idemixCredential and checks validity
Assert.IsTrue(setup.idemixCredential.Verify(setup.sk, setup.key.Ipk));
// Test serialization of IdemixidemixCredential
Assert.IsTrue(new IdemixCredential(setup.idemixCredential.ToProto()).Verify(setup.sk, setup.key.Ipk));
// Create CRI that contains no revocation mechanism
int epoch = 0;
BIG[] rhIndex = { new BIG(0) };
CredentialRevocationInformation cri = RevocationAuthority.CreateCRI(setup.revocationKeyPair, rhIndex, epoch, RevocationAlgorithm.ALG_NO_REVOCATION);
// Create a new unlinkable pseudonym
IdemixPseudonym pseudonym = new IdemixPseudonym(setup.sk, setup.key.Ipk); //tcert
// Test signing no disclosure
bool[] disclosure = { false, false, false, false, false };
byte[] msg = { 1, 2, 3, 4, 5 };
IdemixSignature signature = new IdemixSignature(setup.idemixCredential, setup.sk, pseudonym, setup.key.Ipk, disclosure, msg, 0, cri);
Assert.IsNotNull(signature);
// Test bad disclosure: Disclosure > number of attributes || Disclosure < number of attributes
bool[] badDisclosure = { false, true };
bool[] badDisclosure2 = { true, true, true, true, true, true, true };
try
{
new IdemixSignature(setup.idemixCredential, setup.sk, pseudonym, setup.key.Ipk, badDisclosure, msg, 0, cri);
new IdemixSignature(setup.idemixCredential, setup.sk, pseudonym, setup.key.Ipk, badDisclosure2, msg, 0, cri);
Assert.Fail("Expected an ArgumentException");
}
catch (ArgumentException)
{
//ignored
/* Do nothing, the expected behaviour is to catch this exception.*/
}
// check that the signature is valid
Assert.IsTrue(signature.Verify(disclosure, setup.key.Ipk, msg, setup.attrs, 0, setup.revocationKeyPair, epoch));
// Test serialization of IdemixSignature
Assert.IsTrue(new IdemixSignature(signature.ToProto()).Verify(disclosure, setup.key.Ipk, msg, setup.attrs, 0, setup.revocationKeyPair, epoch));
// Test signing selective disclosure
bool[] disclosure2 = { false, true, true, true, false };
signature = new IdemixSignature(setup.idemixCredential, setup.sk, pseudonym, setup.key.Ipk, disclosure2, msg, 0, cri);
Assert.IsNotNull(signature);
// check that the signature is valid
Assert.IsTrue(signature.Verify(disclosure2, setup.key.Ipk, msg, setup.attrs, 0, setup.revocationKeyPair, epoch));
// Test signature verification with different disclosure
Assert.IsFalse(signature.Verify(disclosure, setup.key.Ipk, msg, setup.attrs, 0, setup.revocationKeyPair, epoch));
// test signature verification with different issuer public key
Assert.IsFalse(signature.Verify(disclosure2, new IdemixIssuerKey(new [] { "Attr1, Attr2, Attr3, Attr4, Attr5" }).Ipk, msg, setup.attrs, 0, setup.revocationKeyPair, epoch));
// test signature verification with different message
byte[] msg2 = { 1, 1, 1 };
Assert.IsFalse(signature.Verify(disclosure2, setup.key.Ipk, msg2, setup.attrs, 0, setup.revocationKeyPair, epoch));
// Sign a message with respect to a pseudonym
IdemixPseudonymSignature nymsig = new IdemixPseudonymSignature(setup.sk, pseudonym, setup.key.Ipk, msg);
// check that the pseudonym signature is valid
Assert.IsTrue(nymsig.Verify(pseudonym.Nym, setup.key.Ipk, msg));
// Test serialization of IdemixPseudonymSignature
Assert.IsTrue(new IdemixPseudonymSignature(nymsig.ToProto()).Verify(pseudonym.Nym, setup.key.Ipk, msg));
}