private void ECDH_GenerateEphemeral(EncryptMessage msg)
{
CBORObject epk = CBORObject.NewMap();
if (_mKey.AsString("kty") == "EC")
{
X9ECParameters p = NistNamedCurves.GetByName(_mKey.AsString("crv"));
ECDomainParameters parameters = new ECDomainParameters(p.Curve, p.G, p.N, p.H);
ECKeyPairGenerator pGen = new ECKeyPairGenerator();
ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(parameters, Message.s_PRNG);
pGen.Init(genParam);
AsymmetricCipherKeyPair p1 = pGen.GenerateKeyPair();
epk.Add("kty", "EC");
epk.Add("crv", _mKey.AsString("crv"));
ECPublicKeyParameters priv = (ECPublicKeyParameters)p1.Public;
epk.Add("x", priv.Q.Normalize().XCoord.ToBigInteger().ToByteArrayUnsigned());
epk.Add("y", priv.Q.Normalize().YCoord.ToBigInteger().ToByteArrayUnsigned());
}
else if (_mKey.AsString("kty") == "OKP")
{
switch (_mKey.AsString("crv"))
{
case "X25519":
Ed25519KeyPairGenerator pGen = new Ed25519KeyPairGenerator();
Ed25519KeyGenerationParameters genParam = new Ed25519KeyGenerationParameters(Message.s_PRNG);
pGen.Init(genParam);
AsymmetricCipherKeyPair p1 = pGen.GenerateKeyPair();
Ed25519PublicKeyParameters pub = (Ed25519PublicKeyParameters)p1.Public;
epk.Add("kty", "OKP");
epk.Add("crv", "X25519");
epk.Add("x", pub.GetEncoded());
break;
default:
throw new JoseException("Unknown OPK curve");
}
}
else
{
throw new JoseException("Internal Error");
}
if (msg.FindAttribute(CBORObject.FromObject("epk"), PROTECTED) != null)
{
msg.AddAttribute(CBORObject.FromObject("epk"), epk, PROTECTED);
}
else if (msg.FindAttribute(CBORObject.FromObject("epk"), PROTECTED) != null)
{
msg.AddAttribute(CBORObject.FromObject("epk"), epk, PROTECTED);
}
else
{
AddAttribute("epk", epk, UNPROTECTED);
}
}
/// <summary>
/// Generate key pair.
/// </summary>
/// <returns></returns>
public override AsymmetricCipherKeyPair GenerateKeyPair()
{
IAsymmetricCipherKeyPairGenerator generator = new Ed25519KeyPairGenerator();
KeyGenerationParameters parameters = new Ed25519KeyGenerationParameters(Common.ThreadSecureRandom.Value);
generator.Init(parameters);
return(generator.GenerateKeyPair());
}
/// <summary>
/// Create a key pair for by using a given curve
/// </summary>
/// <param name="curveName">the curve to use for key creation</param>
public void CreateKeyPair(string curveName)
{
var keyGenerationParameters = new Ed25519KeyGenerationParameters(new SecureRandom());
var keyGenerator = new Ed25519KeyPairGenerator();
keyGenerator.Init(keyGenerationParameters);
keyPair = keyGenerator.GenerateKeyPair();
}
// **** Code to be reviewed - it compiles, but he has little if any relationship with the Dart code...
// ****
public String getEncoded()
{
byte[] seedBytes = HexEncDec.StringToByteArray(Seed);
Ed25519KeyPairGenerator wkGen = new Ed25519KeyPairGenerator();
SecureRandom rnd = new SecureRandom(seedBytes);
Ed25519KeyGenerationParameters genPar = new Ed25519KeyGenerationParameters(rnd);
wkGen.Init(genPar);
AsymmetricCipherKeyPair keys = wkGen.GenerateKeyPair();
Ed25519PublicKeyParameters key = (Ed25519PublicKeyParameters)keys.Public;
byte[] output = key.GetEncoded();
return(Convert.ToBase64String(output));
}
