RSA编码实现，创建公钥和私钥，并判定生成的是否是素数，生成界面和菜单便于用户选择，用扩展欧几里得短发求乘法逆元，快速模幂算法，-RSA Coding, create public and private keys, and determine whether the resulting number is a prime generate user-friendly interface and menu choices, with short hair extensions Euclid se