CA认证系统中使用最广泛的证书载体是USBKEY，国内各大产商一般是使用CSP服务来提供加解密服务。这个例子是2048位的RSA数字签名与验证签名，使用厂家自带的csp来实现（若下载者没有安装任何USBKEY的驱动，可将代码中的TEST_CSP_NAME宏改为NULL 即调用微软自带的csp），编译环境VC6.0。-CA authentication system is the most widely used carrier certificate in USBKEY, the major domestic producers are generally use of CSP service to provide encryption services. This example is a 2048- bit RSA digital signature and verifying signature, use the manufacturer s own CSP to achieve (if downloaders not install any driver USBKEY, TEST_CSP_NAME macros in your code can be changed to NULL is called Microsoft s own CSP), the compiler environment VC6.0.