前言
对于信息的加密方式多种多样，之前为大家介绍了一种自己设计的加密方式，有兴趣的朋友可以欣赏一下，欢迎给予指点。今天为大家介绍一下对称加密方式，所谓对称加密指的是加密和解密方式呈对称格式，即解密是加密的逆过程，下面我们就看一下：DES、3DES、AES、PBE这四种方式，他们的加密强度依次递增。好吧闲话少说，上代码：
首先我们先看一下DES：
package cn.edu.hpu.des;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class jdk_DES {
private static final String src = "I Love You !";
public static void main(String [] args){
jdk_DES.jdkDES();
}
@SuppressWarnings("static-access")
public static void jdkDES(){
try {
//获得KEY
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);//设置为默认值56即可
//获得KEY对象
SecretKey secrekeyone = keyGenerator.generateKey();
byte [] byteskey = secrekeyone.getEncoded();
//KEY转换
DESKeySpec deskeyspec = new DESKeySpec(byteskey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
Key secerkeytwo = factory.generateSecret(deskeyspec);
//加密
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(cipher.ENCRYPT_MODE, secerkeytwo);//设置模式为加密
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("jdkEDS:"+result.toString());
//解密
cipher.init(cipher.DECRYPT_MODE, secerkeytwo);//设置模式为解密
result = cipher.doFinal(result);
System.out.println("jdkEDS:"+new String(result));
} catch (Exception e) {
e.printStackTrace();
}
}
}
运行结果：
第二种3重DES:
package cn.edu.hpu.des;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class jdk_3DES {
private static final String src = "I Love You !";
public static void main(String [] args){
jdk_3DES.jdk3DES();
}
@SuppressWarnings("static-access")
public static void jdk3DES(){
try {
//获得KEY
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
//keyGenerator.init(112);//设置密钥长度，默认值为168，也可设置为112
keyGenerator.init(new SecureRandom());//设置为默认值
//获得KEY对象
SecretKey secrekeyone = keyGenerator.generateKey();
byte [] byteskey = secrekeyone.getEncoded();
//KEY转换
DESKeySpec deskeyspec = new DESKeySpec(byteskey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
Key secerkeytwo = factory.generateSecret(deskeyspec);
//加密
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(cipher.ENCRYPT_MODE, secerkeytwo);//设置模式为加密
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("jdkEDS:"+result.toString());
//解密
cipher.init(cipher.DECRYPT_MODE, secerkeytwo);//设置模式为解密
result = cipher.doFinal(result);
System.out.println("jdkEDS:"+new String(result));
} catch (Exception e) {
e.printStackTrace();
}
}
}
运行结果：
第三种AES:
package cn.edu.hpu.aes;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class jdk_AES {
private static final String src = "I Love You !";
public static void main(String [] args){
AES();
}
public static void AES(){
try {
//获得key
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(new SecureRandom());//默认密钥长度为：
SecretKey secretKey = keyGenerator.generateKey();
byte [] keyBytes = secretKey.getEncoded();
//key转换
Key key = new SecretKeySpec(keyBytes, "AES");
//加密
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("AES="+result.toString());
//解密
cipher.init(Cipher.DECRYPT_MODE, key);
result = cipher.doFinal(result);
System.out.println("AES="+new String(result));
} catch (Exception e) {
e.printStackTrace();
}
}
}
运行结果：
最后一种PBE:
package cn.edu.hpu.pbe;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
public class jdk_PBE {
public static final String src = "I Love You !";
public static void main(String [] args){
jdkPBE();
}
private static void jdkPBE(){
try {
//初始化盐
SecureRandom random = new SecureRandom();
byte [] salt = random.generateSeed(8);
//口令和密钥
String password = "imooc";
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());//生成密钥转换对象
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
Key key = factory.generateSecret(pbeKeySpec);
//加密
PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(salt, 100);//实例化PBE对象的一个输入的材料：参数分别为"盐和迭代次数"
Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
cipher.init(Cipher.ENCRYPT_MODE, key, pbeParameterSpec);
byte [] result = cipher.doFinal(src.getBytes());
System.out.println("PBE:"+result.toString());
//解密
cipher.init(Cipher.DECRYPT_MODE, key, pbeParameterSpec);
result = cipher.doFinal(result);
System.out.println("PBE:"+new String(result));
} catch (Exception e) {
e.printStackTrace();
}
}
}
运行结果：
结语
对于以上四种方式，PBE是一种较安全的加密方式，对加密起绝定作用的是盐和password，决定着加密的结果。以上即使要为大家介绍的对称加密方式，哪位有更好的方式，还望指教。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持亿速云。
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