private byte[] ExportKeyBlob(bool includePrivateParameters)
{
#if NETNATIVE
return(null);
#else
return(ECCng.ExportKeyBlob(Key, includePrivateParameters));
#endif //NETNATIVE
}
internal static ECDiffieHellmanCngPublicKey FromKey(CngKey key)
{
CngKeyBlobFormat format;
string? curveName;
byte[] blob = ECCng.ExportKeyBlob(key, false, out format, out curveName);
return(new ECDiffieHellmanCngPublicKey(blob, curveName, format));
}
internal static ECDiffieHellmanCngPublicKey FromKey(CngKey key)
{
Contract.Requires(key != null && key.AlgorithmGroup == CngAlgorithmGroup.ECDiffieHellman);
Contract.Ensures(Contract.Result <ECDiffieHellmanCngPublicKey>() != null);
CngKeyBlobFormat format;
string curveName;
byte[] blob = ECCng.ExportKeyBlob(key, false, out format, out curveName);
return(new ECDiffieHellmanCngPublicKey(blob, curveName, format));
}
internal static void ExportParameters(
CngKey key,
bool includePrivateParameters,
ref ECParameters ecparams)
{
string curveName = key.GetCurveName();
if (string.IsNullOrEmpty(curveName))
{
byte[] fullKeyBlob = ECCng.ExportFullKeyBlob(key, includePrivateParameters);
ECCng.ExportPrimeCurveParameters(ref ecparams, fullKeyBlob, includePrivateParameters);
}
else
{
byte[] keyBlob = ECCng.ExportKeyBlob(key, includePrivateParameters);
ECCng.ExportNamedCurveParameters(ref ecparams, keyBlob, includePrivateParameters);
ecparams.Curve = ECCurve.CreateFromFriendlyName(curveName);
}
}
/// <summary>
/// Exports the key used by the ECC object into an <see cref="ECParameters"/> object.
/// If the key was created as a named curve, the Curve property will contain named curve parameters
/// otherwise it will contain explicit parameters.
/// </summary>
/// <exception cref="CryptographicException">
/// if there was an issue obtaining the curve values.
/// </exception>
/// <returns>The key and named curve parameters used by the ECC object.</returns>
public override ECParameters ExportParameters()
{
using (CngKey key = Import())
{
ECParameters ecparams = default;
string? curveName = key.GetCurveName(out _);
if (string.IsNullOrEmpty(curveName))
{
byte[] fullKeyBlob = ECCng.ExportFullKeyBlob(key, includePrivateParameters: false);
ECCng.ExportPrimeCurveParameters(ref ecparams, fullKeyBlob, includePrivateParameters: false);
}
else
{
byte[] keyBlob = ECCng.ExportKeyBlob(key, includePrivateParameters: false);
ECCng.ExportNamedCurveParameters(ref ecparams, keyBlob, includePrivateParameters: false);
ecparams.Curve = ECCurve.CreateFromFriendlyName(curveName);
}
return(ecparams);
}
}
private byte[] ExportKeyBlob(bool includePrivateParameters)
{
return(ECCng.ExportKeyBlob(Key, includePrivateParameters));
}