完成基于公钥证书的非对称密钥分配工作

说明：

（1）作为通讯的双方A和B，都有一个共同信赖的第三方CA，由CA为每个人生成公钥证书和相应的私钥并分发给A、B。

（2）A和B分别将自己的公钥证书提供给对方后，分别在本地验证对方公钥证书是否可靠（假定A、B已经获得CA的公钥），然后A用B的公钥加密一个数据X（整型，可自己定义，比如100）并发送给B，B用自己的私钥解密后得到数据X，然后按协商好的函数F（比如F(X)=2*X）计算得到F(X)，再利用A的公钥加密后发送给A；A在本地用自己的私钥解密后得到F(x)，在同本地计算得到的F(X)进行对比，如果一致，说明公钥分配成功。

（3）A用B的公钥对一图象文件（test_pic.bmp)进行加密并发送给B，B收到后解密，对比原图象看是否一致，并记录整个加密/解密的所用时间T1；



要求：

（1）JAVA语言编程实现，基于RSA完成非对称密码技术的加/解密（JAVA有库函数支持）；

（2）密钥长度不少于384位；

（3）基于网络完成密钥分配工作（作为通信的双方A、B应部署于两台主机上，CA可以部署在其中一台主机上或第三台主机上）；-Completed based on public key certificate allocation asymmetric key

Descr iption:

( A ) as a communication between the parties A and B, there is a common trusted third-party CA, generated by the CA public key certificate for each person and the corresponding private key and distributed to A, B.

(2) A and B respectively own public key certificate to each other , respectively, the other public key certificate in the local authentication is reliable ( assuming A, B have the CA　s public key ) , and A with B s public key to encrypt a data X ( integer, can define their own, such as 100 ) and sent to B, B to use their private key to decrypt the data obtained by X, and then press the negotiated function F ( eg F (X) = 2* X) is calculated F (X), and then encrypted using the public key of A to a　A locally decrypted with the private key to obtain F (x), obtained in the same local computing F (X) for comparison , if the same , indicating that public key distribution success.

(3) A with B s pu