public static ByteString DecryptString(Hash em, ECKeyPair keyPair)
{
#if NETCOREAPP
throw new NotImplementedException();
#else
ECParameters parameters = new ECParameters();
byte[] ems = em;
parameters.Q.X = ems.Skip(1).Take(32).ToArray();
parameters.Q.Y = ems.Skip(33).Take(32).ToArray();
parameters.D = keyPair.D;
parameters.Curve = keyPair.ECParameters.Curve;
parameters.Validate();
using (var ecDiffieHellmanCng = new ECDiffieHellmanCng())
{
ecDiffieHellmanCng.ImportParameters(parameters);
var ek = ecDiffieHellmanCng.DeriveKeyFromHash(ecDiffieHellmanCng.PublicKey, HashAlgorithmName.SHA256, null, new byte[] { 0, 0, 0, 1 });
using (RijndaelManaged aes = new RijndaelManaged())
{
aes.Padding = PaddingMode.PKCS7;
var d = aes.CreateDecryptor(ek, new byte[16]);
var bs = d.TransformFinalBlock(ems.Skip(65).Take(ems.Length - 65 - 32).ToArray(), 0,
ems.Length - 65 - 32);
return(bs);
}
}
#endif
}
public static partial ECDiffieHellman Create(ECParameters parameters)
{
ECDiffieHellman ecdh = new ECDiffieHellmanCng();
try
{
ecdh.ImportParameters(parameters);
return(new ECDiffieHellmanWrapper(ecdh));
}
catch
{
ecdh.Dispose();
throw;
}
}
public ICertificatePal CopyWithPrivateKey(ECDiffieHellman ecdh)
{
ECDiffieHellmanCng?ecdhCng = ecdh as ECDiffieHellmanCng;
if (ecdhCng != null)
{
ICertificatePal?clone = CopyWithPersistedCngKey(ecdhCng.Key);
if (clone != null)
{
return(clone);
}
}
ECParameters privateParameters = ecdh.ExportParameters(true);
using (PinAndClear.Track(privateParameters.D !))
using (ECDiffieHellmanCng clonedKey = new ECDiffieHellmanCng())
{
clonedKey.ImportParameters(privateParameters);
return(CopyWithEphemeralKey(clonedKey.Key));
}
}
