internal void MakeCertChain(DeviceBundle bundle, int chainLen, int fwidSeed)
{
var aliasCert = bundle.AliasCert;
DateTime now = DateTime.Now;
byte[] fwid = Helpers.HashData(new byte[1] {
0
}, 0, 1);
const int keyStrength = 256;
CryptoApiRandomGenerator rg = new CryptoApiRandomGenerator();
SecureRandom random = new SecureRandom(rg);
KeyGenerationParameters keyGenerationParameters = new KeyGenerationParameters(random, keyStrength);
var keyPairGenerator = new ECKeyPairGenerator();
keyPairGenerator.Init(keyGenerationParameters);
// Starting the loop we have a (not yet certified) DeviceID public key
// and the Issuer of the Alias Cert (which we want to be the DevID-cert DN.)
List <X509Certificate> certChain = new List <X509Certificate>();
var lastCertIssuer = aliasCert.IssuerDN;
var lastPubKey = bundle.DeviceIDPublic;;
AsymmetricCipherKeyPair lastKeyPair = null;
for (int j = 0; j < chainLen; j++)
{
bool rootCert = j == chainLen - 1;
bool lastButOne = j == chainLen - 2;
AsymmetricCipherKeyPair caKey = keyPairGenerator.GenerateKeyPair();
X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();
certGen.SetSerialNumber(new BigInteger(new byte[] { 1, 2, 3, 4, 5 }));
var issuerDn = lastButOne ?
new X509Name($"CN=Vendor Root CA O=MSR_TEST, C=US") :
new X509Name($"CN=Vendor Intermediate CA {j}, O=MSR_TEST, C=US");
if (rootCert)
{
issuerDn = lastCertIssuer;
}
certGen.SetIssuerDN(issuerDn);
certGen.SetSubjectDN(lastCertIssuer);
certGen.SetNotBefore(now);
certGen.SetNotAfter(now + new TimeSpan(365 * 10, 0, 0, 0, 0));
certGen.SetPublicKey(lastPubKey);
int pathLengthConstraint = j + 1;
certGen.AddExtension(X509Extensions.BasicConstraints, true, new BasicConstraints(pathLengthConstraint));
certGen.AddExtension(X509Extensions.KeyUsage, true, new KeyUsage(KeyUsage.KeyCertSign));
X509Certificate certificate;
if (rootCert)
{
ISignatureFactory signatureFactory = new Asn1SignatureFactory("SHA256WITHECDSA", lastKeyPair.Private, random);
certificate = certGen.Generate(signatureFactory);
}
else
{
ISignatureFactory signatureFactory = new Asn1SignatureFactory("SHA256WITHECDSA", caKey.Private, random);
certificate = certGen.Generate(signatureFactory);
}
lastCertIssuer = certificate.IssuerDN;
lastPubKey = caKey.Public;
lastKeyPair = caKey;
certChain.Add(certificate);
}
// Chain including root, but not AliasCert. NOTE, finishes with CA
Helpers.WritePEMObjects(ToPath(Program.DeviceCertChain), certChain.ToArray());
// cert chain including AliasCert (alias cert is first. CA is last)
JoinFiles(Program.AliasCert, Program.DeviceCertChain, Program.DeviceCertChainIncAlias);
// just the device CA (for the server)
Helpers.WritePEMObject(ToPath("DeviceCA.pem"), certChain.Last());
// Now make some certs for the server to use
string serverCaName = "CN=Server CA, C=US, O=MSR_TEST";
string serverName = "CN=Server Cert, C=US, O=MSR_TEST";
var serverCA = MakeCertInternal(serverCaName, serverCaName, true, null, null, 1);
var serverCert = MakeCertInternal(serverCaName, serverName, false, serverCA.KeyPair, null, 0);
Helpers.WritePEMObject(ToPath(Program.ServerCA), serverCA.Certificate);
Helpers.WritePEMObjects(ToPath(Program.ServerChain), new Object[] { serverCA.Certificate, serverCert.Certificate });
//Helpers.WritePEMObject(ToPath("T0_ServerCAKey.PEM", serverCA.KeyPair);
Helpers.WritePEMObject(ToPath(Program.ServerCert), serverCert.Certificate);
Helpers.WritePEMObject(ToPath(Program.ServerKey), serverCert.KeyPair);
// OpenSSL needs a file with the Device CA AND the server CA
JoinFiles(Program.DeviceCertChain, Program.ServerCA, Program.DeviceCertChainAndServerCA);
// OpenSSL test scripts -
// print a cert
// openssl x509 -text -in T0_ServerCA.pem
// Just verify the client chain
// openssl verify -purpose sslclient -CAfile T0_DeviceCertChain.PEM DeviceAliasCert.PEM
// Just verify the server chain
// openssl verify -purpose sslserver -CAfile T0_ServerCA.PEM T0_ServerCert.PEM
// openssl s_client -connect localhost: 5556 - cert T0_AliasCert.PEM - key T0_AliasKey.PEM - CAfile T0_DeviceCertChainAndServerCA.PEM
// openssl s_client -connect localhost:5556 -cert T0_AliasCert.PEM -key T0_AliasKey.PEM -CAfile T0_DeviceCertChain.PEM
// openssl s_server -cert T0_ServerCert.PEM -key T0_ServerKey.PEM -CAfile T0_DeviceCertChainAndServerCA.PEM -status_verbose -verify 10 -rev -accept 5556
return;
}