本文实例讲述了Java实现的RSA加密解密算法。分享给大家供大家参考，具体如下：
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import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import javax.crypto.Cipher;
public class RSAUtils{
public static String makekeyfile(String pubkeyfile, String prikeyfile) {
String result = "生成公私钥文件失败";
try{
// KeyPairGenerator用于生成公私钥对，基于RSA算法生成对象
KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");
// 初始化密钥对生成器，密钥大小为1024位
gen.initialize(1024);
// //生成强随机数
// SecureRandom random = new SecureRandom();
// gen.initialize(1024,random);
// 生成一个密钥对，保存在pair中
KeyPair pair = gen.generateKeyPair();
// 得到私钥
RSAPrivateKey priKey = (RSAPrivateKey) pair.getPrivate();
// 得到公钥
RSAPublicKey pubKey = (RSAPublicKey) pair.getPublic();
// 生成私钥文件
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(prikeyfile));
os.writeObject(priKey);
os.flush();
os.close();
//生成公钥文件
os = new ObjectOutputStream(new FileOutputStream(pubkeyfile));
os.writeObject(pubKey);
os.flush();
os.close();
result = "生成公钥文件【"+pubkeyfile+"】生成私钥文件【"+prikeyfile+"】";
}catch(Exception e){
e.printStackTrace();
}
return result;
}
public static void main(String[] args) {
try{
String pubfile = "F:/images/pub.key";
String prifile = "F:/images/pri.key";
String result = null;
//result = makekeyfile(pubfile, prifile);
result = markPuPra(pubfile, prifile);
System.out.println(result);
}catch(Exception e){
e.printStackTrace();
}
}
public static String markPuPra(String pubfile,String prifile){
String results = "加解密出错";
try{
ObjectInputStream os = new ObjectInputStream(new FileInputStream(pubfile));
RSAPublicKey pubkey = (RSAPublicKey) os.readObject();
os.close();
os = new ObjectInputStream(new FileInputStream(prifile));
RSAPrivateKey prikey = (RSAPrivateKey) os.readObject();
os.close();
String utf = "UTF-8";
String msg = "##中国%%的）人@+_";
// 使用公钥加密私钥解密
System.out.println("原文: " + msg);
byte[] puk = handleData(pubkey, msg.getBytes(utf), 1);
System.out.println("加密后文件数据: " + new String(puk, utf));
byte[] dpuk = handleData(prikey, puk, 0);
System.out.println("解密后文件数据: " + new String(dpuk, utf));
msg = "jd#我0们的￥人+=#新";
// 使用私钥加密公钥解密
System.out.println("原文: " + msg);
byte[] prk = handleData(prikey, msg.getBytes(utf), 1);
System.out.println("加密后文件数据: " + new String(prk, utf));
byte[] dprk = handleData(pubkey, prk, 0);
System.out.println("解密后文件数据: " + new String(dprk, utf));
results = "加解密完成";
}catch(Exception e){
e.printStackTrace();
}
return results;
}
/**
*
* @param k
* @param data
* @param encrypt 1 加密 0解密
* @return
* @throws Exception
*/
public static byte[] handleData(Key key, byte[] data, int type) throws Exception {
if (key != null) {
Cipher ci = Cipher.getInstance("RSA");
if (type == 1) {
ci.init(Cipher.ENCRYPT_MODE, key);
byte[] res = ci.doFinal(data);
return res;
}
if (type == 0) {
ci.init(Cipher.DECRYPT_MODE, key);
byte[] res = ci.doFinal(data);
return res;
}
}
return null;
}
}
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希望本文所述对大家java程序设计有所帮助。
原文链接：http://blog.csdn.net/cnsd_liuliu/article/details/52474062