/// <summary>
/// Gets the <see cref="GostECDsa"/> public key from the <see cref="X509Certificate2"/>
/// certificate.
/// </summary>
/// <param name="certificate">
/// The certificate.
/// </param>
/// <returns>
/// The public key, or <see langword="null"/> if the certificate does not have a
/// <see cref="GostECDsa"/> public key.
/// </returns>
/// <exception cref="ArgumentNullException">
/// The <paramref name="certificate"/> parameter is <see langword="null"/>.
/// </exception>
/// <exception cref="CryptographicException">
/// The handle is invalid.
/// </exception>
public static GostECDsa?GetGostECDsaPublicKey(this X509Certificate2 certificate)
{
if (certificate == null)
{
throw new ArgumentNullException(nameof(certificate));
}
if (!IsGostECDsa(certificate))
{
return(null);
}
var publicKey = certificate.PublicKey;
GostECDsa?result = publicKey.EncodedKeyValue.Oid.Value switch
{
CryptoConstants.GostECDsa256OidValue => GostECDsa256.Create(),
CryptoConstants.GostECDsa512OidValue => GostECDsa512.Create(),
_ => null
};
if (result is not null)
{
try
{
var parameters = ReadParameters(publicKey);
result.ImportParameters(parameters);
}
catch
{
result.Dispose();
throw;
}
}
return(result);
}
/// <summary>
/// Gets the <see cref="GostECDsa"/> public key from the <see cref="X509Certificate2"/>
/// certificate.
/// </summary>
/// <param name="certificate">
/// The certificate.
/// </param>
/// <returns>
/// The public key, or <c>null</c> if the certificate does not have a
/// <see cref="GostECDsa"/> public key.
/// </returns>
/// <exception cref="ArgumentNullException">
/// The <paramref name="certificate"/> parameter is <c>null</c>.
/// </exception>
/// <exception cref="CryptographicException">
/// The handle is invalid.
/// </exception>
public static GostECDsa GetECDsaPublicKey(this X509Certificate2 certificate)
{
if (certificate == null)
{
throw new ArgumentNullException(nameof(certificate));
}
if (!IsGostECDsa(certificate))
{
return(null);
}
PublicKey publicKey = certificate.PublicKey;
GostECDsa result;
switch (publicKey.EncodedKeyValue.Oid.Value)
{
case GostECDsa256OidValue:
#if NET45
result = GostECDsa256.Create();
#elif NETCOREAPP1_0
result = new GostECDsa256Managed();
#endif
break;
case GostECDsa512OidValue:
#if NET45
result = GostECDsa512.Create();
#elif NETCOREAPP1_0
result = new GostECDsa512Managed();
#endif
break;
default:
return(null);
}
try
{
ECParameters parameters = ReadParameters(publicKey);
result.ImportParameters(parameters);
}
catch
{
result.Dispose();
throw;
}
return(result);
}
