The CryptExportKey function exports a cryptographic key or a key pair from a cryptographic service provider (CSP) in a secure manner.
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An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.