生成公钥和私钥，并用来加密指定字符串， 验证功能一并写上了。呵呵，网上搜了不少资料。花了点时间集成到一起了。比较有实用价值-Public and private keys generated and used to encrypt the specified string, validation be written on. Oh, a lot of information found online. It took time to integrate together. Have m