本段代码在32位信息安全芯片 HT32A256上实现了 RSA加密算法，对开发USBKEY有帮助

LUFA (Lightweight USB Framework for AVRs) is my first foray into the world of USB. Originally based on the AT90USBKEY from Atmel, it is an open-source, driver for the USB-enabled AT90USBXXX AVR microcontroller series, released under the permissive MI

支持标准usb键盘 并且支持部分功能键 测试很好用-Supports standard USB keyboard and supports partial function keys to be used in a very good test.