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();
}
/**
* Helper function to create IdemixSigningIdentity from a file generated by idemixgen go tool
*
* @param mspId
* @return IdemixSigningIdentity object
* @throws IOException
* @throws InvalidProtocolBufferException
*/
private IdemixSigningIdentity CreateIdemixSigningIdentity(string mspId)
{
IdemixMSPSignerConfig signerConfig;
signerConfig = ReadIdemixMSPConfig(Path.Combine(TEST_PATH, mspId, USER_PATH).Locate(), SIGNER_CONFIG);
Assert.IsNotNull(signerConfig);
IssuerPublicKey ipkProto = ReadIdemixIssuerPublicKey(Path.Combine(TEST_PATH, mspId, VERIFIER_PATH).Locate(), IPK_CONFIG);
IdemixIssuerPublicKey ipkt = new IdemixIssuerPublicKey(ipkProto);
Assert.IsTrue(ipkt.Check());
KeyPair revPk = ReadIdemixRevocationPublicKey(Path.Combine(TEST_PATH, mspId, VERIFIER_PATH).Locate(), REVOCATION_PUBLIC_KEY);
BIG skt = BIG.FromBytes(signerConfig.Sk.ToByteArray());
Credential credProto = Credential.Parser.ParseFrom(signerConfig.Cred);
Assert.IsNotNull(credProto);
IdemixCredential credt = new IdemixCredential(credProto);
CredentialRevocationInformation crit = CredentialRevocationInformation.Parser.ParseFrom(signerConfig.CredentialRevocationInformation);
return(new IdemixSigningIdentity(ipkt, revPk, mspId, skt, credt, crit, signerConfig.OrganizationalUnitIdentifier, (IdemixRoles)signerConfig.Role));
}
public IdemixEnrollment(IdemixIssuerPublicKey ipk, KeyPair revocationPk, string mspId, BIG sk, IdemixCredential cred, CredentialRevocationInformation cri, string ou, IdemixRoles roleMask)
{
Ipk = ipk;
RevocationPk = revocationPk;
MspId = mspId;
Sk = sk;
Cred = cred;
Cri = cri;
Ou = ou;
RoleMask = roleMask;
}
public IUser GetUser(string id)
{
IdemixMSPSignerConfig signerConfig = ReadIdemixMSPConfig(Path.Combine(mspId, USER_PATH + id));
KeyPair revocationPk = ReadIdemixRevocationPublicKey(mspId);
BIG sk = BIG.FromBytes(signerConfig.Sk.ToByteArray());
IdemixCredential cred = new IdemixCredential(Credential.Parser.ParseFrom(signerConfig.Cred));
CredentialRevocationInformation cri = CredentialRevocationInformation.Parser.ParseFrom(signerConfig.CredentialRevocationInformation);
IdemixEnrollment enrollment = new IdemixEnrollment(ipk, revocationPk, mspId, sk, cred, cri, signerConfig.OrganizationalUnitIdentifier, (IdemixRoles)signerConfig.Role);
return(new IdemixUser(id, mspId, enrollment));
}
/**
* Create new Idemix Signing Identity with a fresh pseudonym
*
* @param ipk issuer public key
* @param revocationPk the issuer's long term revocation public key
* @param mspId MSP identifier
* @param sk user's secret
* @param cred idemix credential
* @param cri the credential revocation information
* @param ou is OU attribute
* @param role is role attribute
* @throws CryptoException
* @throws InvalidArgumentException
*/
public IdemixSigningIdentity(IdemixIssuerPublicKey ipk, KeyPair revocationPk, string mspId, BIG sk, IdemixCredential cred, CredentialRevocationInformation cri, string ou, IdemixRoles role)
{
// input checks
if (ipk == null)
{
throw new ArgumentException("Issuer Public Key (IPK) must not be null");
}
if (revocationPk == null)
{
throw new ArgumentException("Revocation PK must not be null");
}
if (mspId == null)
{
throw new ArgumentException("MSP ID must not be null");
}
if (string.IsNullOrEmpty(mspId))
{
throw new ArgumentException("MSP ID must not be empty");
}
if (ou == null)
{
throw new ArgumentException("OU must not be null");
}
if (string.IsNullOrEmpty(ou))
{
throw new ArgumentException("OU must not be empty");
}
if (sk == null)
{
throw new ArgumentException("SK must not be null");
}
if (cred == null)
{
throw new ArgumentException("Credential must not be null");
}
if (cri == null)
{
throw new ArgumentException("Credential revocation information must not be null");
}
logger.Trace($"Verifying public key with hash: [{BitConverter.ToString(ipk.Hash).Replace("-", "")}] \nAttributes: [{string.Join(",", ipk.AttributeNames)}]");
if (!ipk.Check())
{
CryptoException e = new CryptoException("Issuer public key is not valid");
logger.Error("", e);
throw e;
}
this.ipk = ipk;
this.sk = sk;
this.cri = cri;
logger.Trace("Verifying the credential");
// cryptographically verify credential
// (check if the issuer's signature is valid)
if (!cred.Verify(sk, ipk))
{
CryptoException e = new CryptoException("Credential is not cryptographically valid");
logger.Error("", e);
throw e;
}
logger.Trace("Checking attributes");
// attribute checks
// 4 attributes are expected:
// - organization unit (disclosed)
// - role: admin or member (disclosed)
// - enrollment id (hidden, for future auditing feature and authorization with CA)
// - revocation handle (hidden, for future revocation support)
if (cred.Attrs.Length != 4)
{
throw new CryptoException($"Error: There are {cred.Attrs.Length} attributes and the expected are 4");
}
byte[] ouBytes = cred.Attrs[0];
byte[] roleBytes = cred.Attrs[1];
byte[] eIdBytes = cred.Attrs[2];
byte[] rHBytes = cred.Attrs[3];
BIG[] attributes = new BIG[4];
attributes[0] = BIG.FromBytes(ouBytes);
attributes[1] = BIG.FromBytes(roleBytes);
attributes[2] = BIG.FromBytes(eIdBytes);
attributes[3] = BIG.FromBytes(rHBytes);
// check that the OU string matches the credential's attribute value
if (!ou.ToBytes().HashModOrder().ToBytes().SequenceEqual(ouBytes))
{
throw new ArgumentException("the OU string does not match the credential");
}
// check that the role matches the credential's attribute value
if (!new BIG((int)role).ToBytes().SequenceEqual(roleBytes))
{
throw new ArgumentException("the role does not match the credential");
}
logger.Trace("Generating fresh pseudonym and proof");
// generate a fresh pseudonym
Pseudonym = new IdemixPseudonym(this.sk, this.ipk);
// generate a fresh proof of possession of a credential
// with respect to a freshly generated pseudonym
Proof = new IdemixSignature(cred, this.sk, Pseudonym, this.ipk, disclosedFlags, msgEmpty, rhIndex, cri);
logger.Trace("Verifying the proof");
// verify the proof
if (!Proof.Verify(disclosedFlags, this.ipk, msgEmpty, attributes, rhIndex, revocationPk, (int)cri.Epoch))
{
throw new CryptoException("Generated proof of identity is not valid");
}
logger.Trace("Generating the Identity Object");
// generate a fresh identity with new pseudonym
idemixIdentity = new IdemixIdentity(mspId, this.ipk, Pseudonym.Nym, ou, role, Proof);
logger.Trace(idemixIdentity.ToString());
}
public static void Setup(TestContext context)
{
// Parse crypto material from files
IdemixMSPSignerConfig signerConfig = null;
try
{
signerConfig = ReadIdemixMSPConfig(Path.Combine(TEST_PATH, MSP1OU1, USER_PATH).Locate(), SIGNER_CONFIG);
}
catch (System.Exception e)
{
Assert.Fail("Unexpected exception while reading signerconfig: " + e.Message);
}
Assert.IsNotNull(signerConfig);
try
{
revocationPk = ReadIdemixRevocationPublicKey(Path.Combine(TEST_PATH, MSP1OU1, VERIFIER_PATH).Locate(), REVOCATION_PUBLIC_KEY);
}
catch (System.Exception e)
{
Assert.Fail("Unexpected exception while reading revocation public key: " + e.Message);
}
Assert.IsNotNull(revocationPk);
IssuerPublicKey ipkProto = null;
try
{
ipkProto = ReadIdemixIssuerPublicKey(Path.Combine(TEST_PATH, MSP1OU1, VERIFIER_PATH).Locate(), IPK_CONFIG);
}
catch (IOException e1)
{
Assert.Fail("Unexpected exception while reading revocation public key" + e1.Message);
}
ipk = new IdemixIssuerPublicKey(ipkProto);
Assert.IsTrue(ipk.Check());
sk = BIG.FromBytes(signerConfig.Sk.ToByteArray());
Credential credProto = null;
try
{
credProto = Credential.Parser.ParseFrom(signerConfig.Cred);
}
catch (InvalidProtocolBufferException)
{
Assert.Fail("Could not parse a credential");
}
Assert.IsNotNull(credProto);
cred = new IdemixCredential(credProto);
try
{
cri = CredentialRevocationInformation.Parser.ParseFrom(signerConfig.CredentialRevocationInformation);
}
catch (InvalidProtocolBufferException e)
{
Assert.Fail("failed to extract cri from signer config: " + e.Message);
}
Assert.IsNotNull(cri);
try
{
signingIdentity = new IdemixSigningIdentity(ipk, revocationPk, MSP1OU1, sk, cred, cri, OU1, IdemixRoles.MEMBER);
}
catch (System.Exception e) when(e is CryptoException || e is ArgumentException)
{
Assert.Fail("Could not create Idemix Signing Identity" + e.Message);
}
Assert.IsNotNull(signingIdentity);
nym = signingIdentity.Pseudonym;
nymPublic = nym.Nym;
proof = signingIdentity.Proof;
}