public bool TryDeriveKey <T>(byte[] PrivateKey, byte[] KeyToDeriveFrom, out byte[] DerivedPrivateKey, ILogger <T> logger)
{
if (OperatingSystem.IsWindows())
{
try
{
using (ECDiffieHellmanCng ECD = new ECDiffieHellmanCng(KeySize))
{
ECD.KeyDerivationFunction = ECDHKDF;
ECD.HashAlgorithm = HashingAlgorithm;
ECD.ImportECPrivateKey(PrivateKey, out _);
CngKey bobsKey = CngKey.Import(KeyToDeriveFrom, KeyBlobFormat);
DerivedPrivateKey = ECD.DeriveKeyMaterial(bobsKey);
}
return(true);
}
catch (CryptographicException e)
{
logger?.LogError("Failed to create shared secret for key pair {Error}", e);
DerivedPrivateKey = default;
return(false);
}
}
else
{
throw new NotSupportedException();
}
}
public bool TryGetPublicKey <T>(byte[] PrivateKey, out byte[] PublicKey, ILogger <T> logger)
{
if (OperatingSystem.IsWindows())
{
try
{
using (ECDiffieHellmanCng ECD = new ECDiffieHellmanCng(KeySize))
{
ECD.KeyDerivationFunction = ECDHKDF;
ECD.HashAlgorithm = HashingAlgorithm;
ECD.ImportECPrivateKey(PrivateKey, out _);
PublicKey = ECD.PublicKey.ToByteArray();
}
return(true);
}
catch (CryptographicException e)
{
logger?.LogError("Failed to get public key with private key {Error}", e);
PublicKey = default;
return(false);
}
}
else
{
throw new NotSupportedException();
}
}