public static byte[] GetCspPrivateKeySecurity(SafeCspHandle cspHandle)
{
byte[] buffer = null;
var bufferSize = 0;
// ReSharper disable once ExpressionIsAlwaysNull
if (!Native.CryptGetProvParam(cspHandle, WindowsX509Native.CspProperties.SecurityDescriptor, buffer,
ref bufferSize, WindowsX509Native.SecurityDesciptorParts.DACL_SECURITY_INFORMATION))
{
// ReSharper disable once InconsistentNaming
const int ERROR_MORE_DATA = 0x000000ea;
var errorCode = Marshal.GetLastWin32Error();
if (errorCode != ERROR_MORE_DATA)
{
throw new CryptographicException(errorCode);
}
}
buffer = new byte[bufferSize];
if (!Native.CryptGetProvParam(cspHandle, WindowsX509Native.CspProperties.SecurityDescriptor, buffer,
ref bufferSize, WindowsX509Native.SecurityDesciptorParts.DACL_SECURITY_INFORMATION))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
return(buffer);
}
public SafeCspHandle Duplicate()
{
bool success = false;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
this.DangerousAddRef(ref success);
IntPtr handle = this.DangerousGetHandle();
int hr = 0;
SafeCspHandle safeCspHandle = new SafeCspHandle();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
if (!SafeCspHandle.CryptContextAddRef(this, IntPtr.Zero, 0))
{
hr = Marshal.GetLastWin32Error();
}
else
{
safeCspHandle.SetHandle(handle);
}
}
if (hr != 0)
{
safeCspHandle.Dispose();
throw new CryptographicException(hr);
}
return(safeCspHandle);
}
finally
{
if (success)
{
this.DangerousRelease();
}
}
}
internal static extern bool CryptAcquireCertificatePrivateKey(SafeCertContextHandle pCert,
AcquireCertificateKeyOptions dwFlags,
IntPtr pvReserved, // void *
[Out] out SafeCspHandle phCryptProvOrNCryptKey,
[Out] out int dwKeySpec,
[Out, MarshalAs(UnmanagedType.Bool)] out bool pfCallerFreeProvOrNCryptKey);
public static extern bool CryptSetProvParam(SafeCspHandle hProv, CspProperties dwParam, [In] byte[] pbData, SecurityDesciptorParts dwFlags);
public static extern bool CryptGetProvParam(SafeCspHandle hProv, CspProperties dwParam, [Out, MarshalAs(UnmanagedType.LPArray)] byte[] pbData, ref int pdwDataLen, SecurityDesciptorParts dwFlags);
protected override bool ReleaseHandle()
{
return(SafeCspHandle.CryptReleaseContext(this.handle, 0));
}
private static extern bool CryptContextAddRef(SafeCspHandle hProv, IntPtr pdwReserved, int dwFlags);
