SafeCertContextHandle.cs

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using System;
 
namespace Internal.Cryptography.Pal.Native;
 
internal class SafeCertContextHandle : SafePointerHandle<SafeCertContextHandle>
{
    private SafeCertContextHandle _parent;
 
    public unsafe CERT_CONTEXT* CertContext => (CERT_CONTEXT*)(void*)handle;
 
    public bool HasPersistedPrivateKey => CertHasProperty(CertContextPropId.CERT_KEY_PROV_INFO_PROP_ID);
 
    public bool HasEphemeralPrivateKey => CertHasProperty(CertContextPropId.CERT_KEY_CONTEXT_PROP_ID);
 
    public bool ContainsPrivateKey
    {
        get
        {
            if (!HasPersistedPrivateKey)
            {
                return HasEphemeralPrivateKey;
            }
            return true;
        }
    }
 
    public SafeCertContextHandle()
    {
    }
 
    public SafeCertContextHandle(SafeCertContextHandle parent)
    {
        if (parent == null)
        {
            throw new ArgumentNullException("parent");
        }
        bool success = false;
        parent.DangerousAddRef(ref success);
        _parent = parent;
        SetHandle(_parent.handle);
    }
 
    internal new void SetHandle(IntPtr handle)
    {
        base.SetHandle(handle);
    }
 
    protected override bool ReleaseHandle()
    {
        if (_parent != null)
        {
            _parent.DangerousRelease();
            _parent = null;
        }
        else
        {
            global::Interop.Crypt32.CertFreeCertificateContext(handle);
        }
        SetHandle(IntPtr.Zero);
        return true;
    }
 
    public unsafe CERT_CONTEXT* Disconnect()
    {
        CERT_CONTEXT* result = (CERT_CONTEXT*)(void*)handle;
        SetHandle(IntPtr.Zero);
        return result;
    }
 
    public SafeCertContextHandle Duplicate()
    {
        return global::Interop.crypt32.CertDuplicateCertificateContext(handle);
    }
 
    private bool CertHasProperty(CertContextPropId propertyId)
    {
        int pcbData = 0;
        return global::Interop.crypt32.CertGetCertificateContextProperty(this, propertyId, null, ref pcbData);
    }
}