public DHKeyPair GenerateKeyPair()
{
DHKeyPair ret = null;
using (ECDiffieHellman alias = ECDiffieHellman.Create())
{
PrivateKey _privKey = new PrivateKey(alias.ExportECPrivateKey());
PublicKey _pubKey = new PublicKey(alias.ExportSubjectPublicKeyInfo());
ret = new DHKeyPair(_privKey, _pubKey);
}
//using (ECDiffieHellmanCng alias = new ECDiffieHellmanCng())
//{
// alias.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
// alias.HashAlgorithm = CngAlgorithm.Sha256;
// ret = new DHKeyPair(new PrivateKey(alias.ExportECPrivateKey()),
// new PublicKey(alias.PublicKey.ToByteArray()));
//}
return(ret);
}
public DHDerivedKey GenerateDerivedKey(DHKeyPair from, PublicKey to)
{
DHDerivedKey ret = null;
using (ECDiffieHellman alias = ECDiffieHellman.Create())
{
ReadOnlySpan <byte> spriv = new ReadOnlySpan <byte>(from.PrivateKey.Value);
alias.ImportECPrivateKey(spriv, out int bytesRead);
ECDiffieHellmanPublicKey topub;
using (ECDiffieHellman _tmp = ECDiffieHellman.Create())
{
ReadOnlySpan <byte> topubread = new ReadOnlySpan <byte>(to.Value);
_tmp.ImportSubjectPublicKeyInfo(topubread, out bytesRead);
topub = _tmp.PublicKey;
}
byte[] derivedKey = alias.DeriveKeyMaterial(topub);
ret = new DHDerivedKey(derivedKey);
}
//using (ECDiffieHellmanCng alias = new ECDiffieHellmanCng())
//{
// ReadOnlySpan<byte> source = new ReadOnlySpan<byte>(from.PrivateKey.Value);
// int butesRead = 0;
// alias.ImportECPrivateKey(source, out butesRead);
// alias.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
// alias.HashAlgorithm = CngAlgorithm.Sha256;
// CngKey k = CngKey.Import(to.Value, CngKeyBlobFormat.EccPublicBlob);
// byte[] derivedKey = alias.DeriveKeyMaterial(k);
// ret = new DHDerivedKey(derivedKey);
//}
return(ret);
}