private SafeNCryptSecretHandle DeriveSecretAgreementHandle(ECDiffieHellmanPublicKey otherPartyPublicKey)
{
if (otherPartyPublicKey == null)
{
throw new ArgumentNullException(nameof(otherPartyPublicKey));
}
ECParameters otherPartyParameters = otherPartyPublicKey.ExportParameters();
using (ECDiffieHellmanCng otherPartyCng = (ECDiffieHellmanCng)Create(otherPartyParameters))
using (SafeNCryptKeyHandle otherPartyHandle = otherPartyCng.GetDuplicatedKeyHandle())
{
string?importedKeyAlgorithmGroup =
CngKeyLite.GetPropertyAsString(
otherPartyHandle,
CngKeyLite.KeyPropertyName.AlgorithmGroup,
CngPropertyOptions.None);
if (importedKeyAlgorithmGroup != BCryptNative.AlgorithmName.ECDH)
{
throw new ArgumentException(SR.Cryptography_ArgECDHRequiresECDHKey, nameof(otherPartyPublicKey));
}
if (CngKeyLite.GetKeyLength(otherPartyHandle) != KeySize)
{
throw new ArgumentException(SR.Cryptography_ArgECDHKeySizeMismatch, nameof(otherPartyPublicKey));
}
using (SafeNCryptKeyHandle localHandle = GetDuplicatedKeyHandle())
{
return(Interop.NCrypt.DeriveSecretAgreement(localHandle, otherPartyHandle));
}
}
}
internal string GetAlgorithmGroup()
{
return(CngKeyLite.GetPropertyAsString(
KeyHandle,
CngKeyLite.KeyPropertyName.AlgorithmGroup,
CngPropertyOptions.None));
}
private void AcceptImport(CngPkcs8.Pkcs8Response response)
{
SafeNCryptKeyHandle keyHandle = response.KeyHandle;
_key.SetHandle(
keyHandle,
CngKeyLite.GetPropertyAsString(
keyHandle,
CngKeyLite.KeyPropertyName.Algorithm,
CngPropertyOptions.None));
ForceSetKeySize(_key.KeySize);
}