/// <summary>
/// Does not throw on error. Returns null ChainPal instead.
/// </summary>
public static ChainPal BuildChain(
bool useMachineContext,
ICertificatePal cert,
X509Certificate2Collection extraStore,
OidCollection applicationPolicy,
OidCollection certificatePolicy,
X509RevocationMode revocationMode,
X509RevocationFlag revocationFlag,
X509Certificate2Collection customTrustStore,
X509ChainTrustMode trustMode,
DateTime verificationTime,
TimeSpan timeout)
{
CertificatePal certificatePal = (CertificatePal)cert;
unsafe
{
using (SafeChainEngineHandle storeHandle = GetChainEngine(trustMode, customTrustStore, useMachineContext))
using (SafeCertStoreHandle extraStoreHandle = ConvertStoreToSafeHandle(extraStore))
{
CERT_CHAIN_PARA chainPara = default;
chainPara.cbSize = Marshal.SizeOf <CERT_CHAIN_PARA>();
int applicationPolicyCount;
using (SafeHandle applicationPolicyOids = applicationPolicy.ToLpstrArray(out applicationPolicyCount))
{
if (!applicationPolicyOids.IsInvalid)
{
chainPara.RequestedUsage.dwType = CertUsageMatchType.USAGE_MATCH_TYPE_AND;
chainPara.RequestedUsage.Usage.cUsageIdentifier = applicationPolicyCount;
chainPara.RequestedUsage.Usage.rgpszUsageIdentifier = applicationPolicyOids.DangerousGetHandle();
}
int certificatePolicyCount;
using (SafeHandle certificatePolicyOids = certificatePolicy.ToLpstrArray(out certificatePolicyCount))
{
if (!certificatePolicyOids.IsInvalid)
{
chainPara.RequestedIssuancePolicy.dwType = CertUsageMatchType.USAGE_MATCH_TYPE_AND;
chainPara.RequestedIssuancePolicy.Usage.cUsageIdentifier = certificatePolicyCount;
chainPara.RequestedIssuancePolicy.Usage.rgpszUsageIdentifier = certificatePolicyOids.DangerousGetHandle();
}
chainPara.dwUrlRetrievalTimeout = (int)Math.Floor(timeout.TotalMilliseconds);
FILETIME ft = FILETIME.FromDateTime(verificationTime);
CertChainFlags flags = MapRevocationFlags(revocationMode, revocationFlag);
SafeX509ChainHandle chain;
if (!Interop.crypt32.CertGetCertificateChain(storeHandle.DangerousGetHandle(), certificatePal.CertContext, &ft, extraStoreHandle, ref chainPara, flags, IntPtr.Zero, out chain))
{
return(null);
}
return(new ChainPal(chain));
}
}
}
}
}
public byte[] EncodeX509EnhancedKeyUsageExtension(OidCollection usages)
{
int numUsages;
using (SafeHandle usagesSafeHandle = usages.ToLpstrArray(out numUsages))
{
unsafe
{
CERT_ENHKEY_USAGE enhKeyUsage = new CERT_ENHKEY_USAGE()
{
cUsageIdentifier = numUsages,
rgpszUsageIdentifier = (IntPtr *)(usagesSafeHandle.DangerousGetHandle()),
};
return(Interop.crypt32.EncodeObject(Oids.EnhancedKeyUsage, &enhKeyUsage));
}
}
}
