实现xml网络传输，进行加密签名与解密验证签名功能。-Achieve xml network transmission, encryption and decryption signature verification signatures.

adding XML signature

可查看该号码最近来访的10个好友哦。修改自偷看QQ签名程序。 简单的读取腾讯的XML RSS,调用签名、日志原理是一样的。-Recent visitors can view the number of 10 friends, oh. Modified peep QQ signature program. Tencent simply reads the XML RSS, call signature log principle is the same.