private static ECDsa DecodeECDsaPublicKey(CertificatePal certificatePal)
{
ECDsa ecdsa;
using (SafeBCryptKeyHandle bCryptKeyHandle = ImportPublicKeyInfo(certificatePal.CertContext))
{
CngKeyBlobFormat blobFormat;
byte[] keyBlob;
#if NETNATIVE
blobFormat = CngKeyBlobFormat.EccPublicBlob;
keyBlob = ExportKeyBlob(bCryptKeyHandle, blobFormat);
using (CngKey cngKey = CngKey.Import(keyBlob, blobFormat))
{
ecdsa = new ECDsaCng(cngKey);
}
#else
string curveName = GetCurveName(bCryptKeyHandle);
if (curveName == null)
{
if (HasExplicitParameters(bCryptKeyHandle))
{
blobFormat = CngKeyBlobFormat.EccFullPublicBlob;
}
else
{
blobFormat = CngKeyBlobFormat.EccPublicBlob;
}
keyBlob = ExportKeyBlob(bCryptKeyHandle, blobFormat);
using (CngKey cngKey = CngKey.Import(keyBlob, blobFormat))
{
ecdsa = new ECDsaCng(cngKey);
}
}
else
{
blobFormat = CngKeyBlobFormat.EccPublicBlob;
keyBlob = ExportKeyBlob(bCryptKeyHandle, blobFormat);
ECParameters ecparams = new ECParameters();
ExportNamedCurveParameters(ref ecparams, keyBlob, false);
ecparams.Curve = ECCurve.CreateFromFriendlyName(curveName);
ecdsa = new ECDsaCng();
ecdsa.ImportParameters(ecparams);
}
#endif
}
return ecdsa;
}
