internal void CertifyExistingFromCsr(int chainLen)
{
var req = (Pkcs10CertificationRequest)Helpers.ReadPemObject(ToPath(Program.DeviceIDCSR));
//var req = (Pkcs10CertificationRequest)Helpers.ReadPemObject(fileName);
if (!req.Verify())
{
Helpers.Notify("PKCS10 csr is not properly self-signed");
return;
}
// todo: should propagate the subject in the CSR into the DeviceID certificate.
var info = req.GetCertificationRequestInfo();
AsymmetricKeyParameter deviceIdKey = PublicKeyFactory.CreateKey(info.SubjectPublicKeyInfo);
DeviceBundle bundle = new DeviceBundle();
bundle.AliasCert = (X509Certificate)Helpers.ReadPemObject(ToPath(Program.AliasCert));
bundle.DeviceIDPublic = (AsymmetricKeyParameter)deviceIdKey;
bundle.AliasKeyPair = (AsymmetricCipherKeyPair)Helpers.ReadPemObject(ToPath(Program.AliasKey));
if (bundle.AliasCert.IssuerDN.ToString() != info.Subject.ToString())
{
Helpers.Notify("CSR Subject Name does not match Alias Certificate Issuer Name: Chain will not build.", true);
return;
}
// todo (maybe). Check that the Alias extension claimed DeviceID matches the DeviceID CSR key.
MakeCertChain(bundle, chainLen, 0);
}
internal void CertifyExistingForJava(int chainLen)
{
DeviceBundle bundle = new DeviceBundle();
bundle.AliasCert = (X509Certificate)Helpers.ReadPemObject(ToPath(Program.AliasCert));
bundle.DeviceIDPublic = (AsymmetricKeyParameter)Helpers.ReadPemObject(ToPath(Program.DeviceIDPublic));
// The current Java implementation stores the public and provate keys separately. Put them back
// together
ECPrivateKeyParameters opriv = (ECPrivateKeyParameters)Helpers.ReadPemObject(ToPath("AliasPrivate.PEM"));
ECPublicKeyParameters opub = (ECPublicKeyParameters)Helpers.ReadPemObject(ToPath("AliasPublic.PEM"));
AsymmetricCipherKeyPair kpx = new AsymmetricCipherKeyPair(opub, opriv);
Helpers.WritePEMObject(ToPath(Program.AliasKey), kpx);
bundle.AliasKeyPair = (AsymmetricCipherKeyPair)Helpers.ReadPemObject(ToPath(Program.AliasKey));
MakeCertChain(bundle, chainLen, 0);
}
internal void CertifyExisting(int chainLen)
{
DeviceBundle bundle = new DeviceBundle();
bundle.AliasCert = (X509Certificate)Helpers.ReadPemObject(ToPath(Program.AliasCert));
bundle.DeviceIDPublic = (AsymmetricKeyParameter)Helpers.ReadPemObject(ToPath(Program.DeviceIDPublic));
bundle.AliasKeyPair = (AsymmetricCipherKeyPair)Helpers.ReadPemObject(ToPath(Program.AliasKey));
//ECPrivateKeyParameters opriv = (ECPrivateKeyParameters) Helpers.ReadPemObject(ToPath("AliasPrivate.PEM"));
//ECPublicKeyParameters opub = (ECPublicKeyParameters)Helpers.ReadPemObject(ToPath("AliasPublic.PEM"));
//AsymmetricCipherKeyPair kpx = new AsymmetricCipherKeyPair(opub, opriv);
//bundle.AliasKeyPair = kpx;
//var privKey = PrivateKeyInfoFactory.CreatePrivateKeyInfo(oo);
//oo.
//var kp = PrivateKeyInfoFactory.CreatePrivateKeyInfo(oo);
//AsymmetricCipherKeyPair kp = (AsymmetricCipherKeyPair)KeyIn.CreatePrivateKeyInfo(oo);
//ECPrivateKeyParameters parms = (ECPrivateKeyParameters) Helpers.ReadPemObject(ToPath(Program.AliasKey));
//bundle.AliasKeyPair = new A
MakeCertChain(bundle, chainLen, 0);
}
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;
}
/// <summary>
/// Make a new Alias Cert. If refresh=false, a new DevID and Alias are created. If refresh=true
/// then just the Alias is created and re-certified using the stored DevID key.
/// </summary>
/// <param name="refresh"></param>
/// <returns></returns>
internal DeviceBundle MakeAliasCert(bool refresh, int fwidSeed)
{
DateTime now = DateTime.Now;
byte[] fwid = Helpers.HashData(new byte[1] {
(byte)fwidSeed
}, 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);
AsymmetricCipherKeyPair devIdKey = null;
if (refresh)
{
devIdKey = (AsymmetricCipherKeyPair)Helpers.ReadPemObject(ToPath(Program.DeviceIDPrivate));
}
else
{
devIdKey = keyPairGenerator.GenerateKeyPair();
}
// test - remove
var oids = new List <Object>()
{
X509Name.UnstructuredName
};
var values = new List <Object>()
{
"ljkljljklkjlkjlkjlkjlkjlkjlkjlkjlkjljklkjlkjlkjlkjljk"
};
X509Name name = new X509Name(oids, values);
AsymmetricCipherKeyPair aliasKey = keyPairGenerator.GenerateKeyPair();
// make a string name based on DevID public. Note that the authoritative information
// is encoded in the RIoT-extension: this is just for quick-and-dirty device identification.
var pubInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(devIdKey.Public);
byte[] pubEncoded = pubInfo.GetDerEncoded();
var pubHashed = Helpers.HashData(pubEncoded, 0, pubEncoded.Length);
var shortNameBytes = Helpers.CopyArray(pubHashed, 0, 8);
var shortNameString = Helpers.Hexify(shortNameBytes);
X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();
var serialNumber = new byte[8];
rg.NextBytes(serialNumber);
serialNumber[0] &= 0x7F;
certGen.SetSerialNumber(new BigInteger(serialNumber));
// The important name-related stuff is encoded in the RIoT extension
certGen.SetIssuerDN(new X509Name($"CN=[I]DevID:{shortNameString}, O=MSR_TEST, C=US"));
// test REMOVE
//certGen.SetSubjectDN(name);
certGen.SetSubjectDN(new X509Name($"CN=[S]DevID:{shortNameString}, O=MSR_TEST, C=US"));
certGen.SetNotBefore(now);
certGen.SetNotAfter(now + new TimeSpan(365 * 10, 0, 0, 0, 0));
certGen.SetPublicKey(aliasKey.Public);
// Add the extensions (todo: not sure about KeyUsage.DigitalSiganture
certGen.AddExtension(X509Extensions.ExtendedKeyUsage, true,
ExtendedKeyUsage.GetInstance(new DerSequence(KeyPurposeID.IdKPClientAuth)));
certGen.AddExtension(X509Extensions.KeyUsage, true, new KeyUsage(KeyUsage.DigitalSignature));
AddRIoTExtension(certGen, fwid, devIdKey);
// sign it
ISignatureFactory signatureFactory = new Asn1SignatureFactory("SHA256WITHECDSA", devIdKey.Private, random);
var certificate = certGen.Generate(signatureFactory);
// and return the bundle
DeviceBundle bundle = new DeviceBundle
{
AliasCert = certificate,
DeviceIDPublic = devIdKey.Public,
AliasKeyPair = aliasKey
};
// Just the AliasCert
Helpers.WritePEMObject(ToPath(Program.AliasCert), bundle.AliasCert);
// The Alias Key Pair
Helpers.WritePEMObject(ToPath(Program.AliasKey), bundle.AliasKeyPair);
// The encoded DevID
Helpers.WritePEMObject(ToPath(Program.DeviceIDPublic), bundle.DeviceIDPublic);
// DeviceIDPrivate (just for the update demo)
Helpers.WritePEMObject(ToPath(Program.DeviceIDPrivate), devIdKey.Private);
return(bundle);
}
