private byte[] PropagateKeyAlgorithmParametersFromChain()
{
unsafe
{
SafeX509ChainHandle certChainContext = null;
try
{
int cbData = 0;
if (!Interop.crypt32.CertGetCertificateContextProperty(_certContext, CertContextPropId.CERT_PUBKEY_ALG_PARA_PROP_ID, null, ref cbData))
{
CERT_CHAIN_PARA chainPara = new CERT_CHAIN_PARA();
chainPara.cbSize = sizeof(CERT_CHAIN_PARA);
if (!Interop.crypt32.CertGetCertificateChain(ChainEngine.HCCE_CURRENT_USER, _certContext, (FILETIME *)null, SafeCertStoreHandle.InvalidHandle, ref chainPara, CertChainFlags.None, IntPtr.Zero, out certChainContext))
{
throw Marshal.GetHRForLastWin32Error().ToCryptographicException();
}
;
if (!Interop.crypt32.CertGetCertificateContextProperty(_certContext, CertContextPropId.CERT_PUBKEY_ALG_PARA_PROP_ID, null, ref cbData))
{
throw Marshal.GetHRForLastWin32Error().ToCryptographicException();
}
;
}
byte[] keyAlgorithmParameters = new byte[cbData];
if (!Interop.crypt32.CertGetCertificateContextProperty(_certContext, CertContextPropId.CERT_PUBKEY_ALG_PARA_PROP_ID, keyAlgorithmParameters, ref cbData))
{
throw Marshal.GetHRForLastWin32Error().ToCryptographicException();
}
;
return(keyAlgorithmParameters);
}
finally
{
if (certChainContext != null)
{
certChainContext.Dispose();
}
}
}
}
