Java密码术加密数据

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.Signature;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;



public class CipherSample {

   public static void main(String args[]) throws Exception{



      //Creating a Signature object

      Signature sign = Signature.getInstance("SHA256withRSA");



      //Creating KeyPair generator object

      KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");



      //Initializing the key pair generator

      keyPairGen.initialize(2048);



      //Generating the pair of keys

      KeyPair pair = keyPairGen.generateKeyPair();      



      //Creating a Cipher object

      Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");



      //Initializing a Cipher object

      cipher.init(Cipher.ENCRYPT_MODE, pair.getPublic());



      //Adding data to the cipher

      byte[] input = "Welcome to codingdict".getBytes();      

      cipher.update(input);



      //encrypting the data

      byte[] cipherText = cipher.doFinal();  

      System.out.println(new String(cipherText, "UTF8"));

   }

}