public IntPtr Alloc(int cbSize)
{
if (cbSize < 0)
{
throw new OverflowException();
}
SafeHeapAllocHandle hBlock = SafeHeapAllocHandle.Alloc(cbSize);
_blocks.Add(hBlock);
return(hBlock.DangerousGetHandle());
}
// Used for binary blobs with internal pointers.
public static SafeHandle GetMsgParamAsMemory(this SafeCryptMsgHandle hCryptMsg, CryptMsgParamType paramType, int index = 0)
{
int cbData = 0;
if (!Interop.Crypt32.CryptMsgGetParam(hCryptMsg, paramType, index, null, ref cbData))
{
throw Interop.CPError.GetLastWin32Error().ToCryptographicException();
}
SafeHandle pvData = SafeHeapAllocHandle.Alloc(cbData);
if (!Interop.Crypt32.CryptMsgGetParam(hCryptMsg, paramType, index, pvData.DangerousGetHandle(), ref cbData))
{
throw Interop.CPError.GetLastWin32Error().ToCryptographicException();
}
return(pvData);
}
internal static unsafe SafeHandle CryptDecodeObjectToMemory(CryptDecodeObjectStructType lpszStructType, IntPtr pbEncoded, int cbEncoded)
{
int cbRequired = 0;
if (!CryptDecodeObject(MsgEncodingType.All, (IntPtr)lpszStructType, pbEncoded, cbEncoded, 0, null, ref cbRequired))
{
throw Marshal.GetLastWin32Error().ToCryptographicException();
}
SafeHandle sh = SafeHeapAllocHandle.Alloc(cbRequired);
if (!CryptDecodeObject(MsgEncodingType.All, (IntPtr)lpszStructType, pbEncoded, cbEncoded, 0, (void *)sh.DangerousGetHandle(), ref cbRequired))
{
throw Marshal.GetLastWin32Error().ToCryptographicException();
}
return(sh);
}
// Used for binary blobs with internal pointers.
public static SafeHandle GetMsgParamAsMemory(this SafeCryptMsgHandle hCryptMsg, CryptMsgParamType paramType, int index = 0)
{
int cbData = 0;
if (!Interop.Crypt32.CryptMsgGetParam(hCryptMsg, paramType, index, IntPtr.Zero, ref cbData))
{
throw Marshal.GetLastPInvokeError().ToCryptographicException();
}
SafeHandle pvData = SafeHeapAllocHandle.Alloc(cbData);
if (!Interop.Crypt32.CryptMsgGetParam(hCryptMsg, paramType, index, pvData.DangerousGetHandle(), ref cbData))
{
Exception e = Marshal.GetLastPInvokeError().ToCryptographicException();
pvData.Dispose();
throw e;
}
return(pvData);
}