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前言
對于信息的加密方式多種多樣，之前為大家介紹了一種自己設計的加密方式，有興趣的朋友可以欣賞一下，歡迎給予指點。今天為大家介紹一下對稱加密方式，所謂對稱加密指的是加密和解密方式呈對稱格式，即解密是加密的逆過程，下面我們就看一下：DES、3DES、AES、PBE這四種方式，他們的加密強度依次遞增。好吧閑話少說，上代碼：
首先我們先看一下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 {
//獲得KEY
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);//設置為默認值56即可
//獲得KEY對象
SecretKey secrekeyone = keyGenerator.generateKey();
byte [] byteskey = secrekeyone.getEncoded();
//KEY轉換
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);//設置模式為加密
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("jdkEDS:"+result.toString());
//解密
cipher.init(cipher.DECRYPT_MODE, secerkeytwo);//設置模式為解密
result = cipher.doFinal(result);
System.out.println("jdkEDS:"+new String(result));
} catch (Exception e) {
e.printStackTrace();
}
}
}
運行結果：
第二種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 {
//獲得KEY
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
//keyGenerator.init(112);//設置密鑰長度，默認值為168，也可設置為112
keyGenerator.init(new SecureRandom());//設置為默認值
//獲得KEY對象
SecretKey secrekeyone = keyGenerator.generateKey();
byte [] byteskey = secrekeyone.getEncoded();
//KEY轉換
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);//設置模式為加密
byte[] result = cipher.doFinal(src.getBytes());
System.out.println("jdkEDS:"+result.toString());
//解密
cipher.init(cipher.DECRYPT_MODE, secerkeytwo);//設置模式為解密
result = cipher.doFinal(result);
System.out.println("jdkEDS:"+new String(result));
} catch (Exception e) {
e.printStackTrace();
}
}
}
運行結果：
第三種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 {
//獲得key
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(new SecureRandom());//默認密鑰長度為：
SecretKey secretKey = keyGenerator.generateKey();
byte [] keyBytes = secretKey.getEncoded();
//key轉換
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();
}
}
}
運行結果：
最后一種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 {
//初始化鹽
SecureRandom random = new SecureRandom();
byte [] salt = random.generateSeed(8);
//口令和密鑰
String password = "imooc";
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());//生成密鑰轉換對象
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
Key key = factory.generateSecret(pbeKeySpec);
//加密
PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(salt, 100);//實例化PBE對象的一個輸入的材料：參數分別為"鹽和迭代次數"
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();
}
}
}
運行結果：
結語
對于以上四種方式，PBE是一種較安全的加密方式，對加密起絕定作用的是鹽和password，決定著加密的結果。以上即使要為大家介紹的對稱加密方式，哪位有更好的方式，還望指教。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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