Function C_SignMessage 

pub unsafe extern "C" fn C_SignMessage(
    hSession: CK_SESSION_HANDLE,
    pParameter: CK_VOID_PTR,
    ulParameterLen: CK_ULONG,
    pData: CK_BYTE_PTR,
    ulDataLen: CK_ULONG,
    pSignature: CK_BYTE_PTR,
    pulSignatureLen: CK_ULONG_PTR,
) -> CK_RV