Implementation example of DES encryption and decryption tool class in Java
This article mainly introduces the DES encryption and decryption tool class implemented in Java, and analyzes the definition and usage of the DES encryption and decryption tool class implemented in Java based on specific examples. Friends in need can refer to this article
The example describes the DES encryption and decryption tool class implemented in Java. I share it with you for your reference. The details are as follows:
A tool class that is very commonly used. I won’t do an in-depth study. Then you can use it directly
DesUtil.java
package lsy;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DesUtil {
/**
* @param args
*/
public static void main(String[] args) {
//以下是加密方法algorithm="AES"的测试
System.out.println(DesUtil.getInstance("lushuaiyin").getEnCodeString("hello"));
//输出 LDewGAZkmWHeYFjBz56ylw==
//将上面的密文解密：
System.out.println(DesUtil.getInstance("lushuaiyin").getDecodeString("LDewGAZkmWHeYFjBz56ylw=="));
//输出 hello
//改变密钥测试
System.out.println(DesUtil.getInstance("suolong").getEnCodeString("hello"));
//输出 /RLowOJ+Fr3KdMcdJeNatg==
System.out.println(DesUtil.getInstance("suolong").getDecodeString("/RLowOJ+Fr3KdMcdJeNatg=="));
//输出 hello
//如果使用不正确的密钥解密，将会：
System.out.println(DesUtil.getInstance("suolong").getDecodeString("LDewGAZkmWHeYFjBz56ylw=="));
}
private SecretKey key=null;//密钥
//定义 加密算法,可用 DES,DESede,Blowfish,AES
//不同的加密方式结果会不同
private static String algorithm="AES";
private static DesUtil desUtil=null;
public DesUtil(){}
public static DesUtil getInstance(String strKey){
desUtil=new DesUtil();
desUtil.createKey(strKey);
return desUtil;
}
/**
* algorithm 算法
* @param strKey
*/
public void createKey(String strKey){
try{
KeyGenerator kg=KeyGenerator.getInstance(DesUtil.algorithm);
byte[] bt=strKey.getBytes("UTF-8");
SecureRandom sr=new SecureRandom(bt);
kg.init(sr);
this.setKey(kg.generateKey());
}catch(Exception e){
}
}
/**
* 加密方法，返回密文
* cipher 密码
* @param dataStr
*/
public String getEnCodeString(String dataStr){
byte[] miwen=null;//密文
byte[] mingwen=null;//明文
Cipher cipher;
String result="";//密文字符串
try{
mingwen=dataStr.getBytes("UTF-8");
cipher=Cipher.getInstance(DesUtil.algorithm);
cipher.init(Cipher.ENCRYPT_MODE, this.getKey());
miwen=cipher.doFinal(mingwen);
BASE64Encoder base64en = new BASE64Encoder();
result=base64en.encodeBuffer(miwen);//或者可以用下面的方法得到密文，结果是不一样的，都可以正常解密
// result=byte2hex(miwen);//密文结果类似2C:37:B0:18:06:64:99:61:DE:60:58:C1:CF:9E:B2:97
}catch(Exception e){
e.printStackTrace();
}
return result;
}
/**
* 解密方法，返回明文
* @param codeStr
* @return
*/
public String getDecodeString(String codeStr){
BASE64Decoder base64De = new BASE64Decoder();
byte[] miwen=null;
byte[] mingwen=null;
String resultData="";//返回的明文
Cipher cipher;
try{
miwen=base64De.decodeBuffer(codeStr);
cipher=Cipher.getInstance(DesUtil.algorithm);
cipher.init(Cipher.DECRYPT_MODE, this.getKey());
mingwen=cipher.doFinal(miwen);
resultData = new String(mingwen,"UTF-8");
}catch(Exception e){
return "密钥不正确或其他原因导致异常，无法解密！";
}
return resultData;
}
//二行制转字符串
public String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
if (n < b.length - 1)
hs = hs + ":";
}
return hs.toUpperCase();
}
public SecretKey getKey() {
return key;
}
public void setKey(SecretKey key) {
this.key = key;
}
public static String getAlgorithm() {
return algorithm;
}
public static void setAlgorithm(String algorithm) {
algorithm = algorithm;
}
}Running results:
LDewGAZkmWHeYFjBz56ylw== hello /RLowOJ+Fr3KdMcdJeNatg== hello 密钥不正确或其他原因导致异常，无法解密！
The above is the detailed content of Implementation example of DES encryption and decryption tool class in Java. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Java Spring Interview Questions
Aug 30, 2024 pm 04:29 PM
In this article, we have kept the most asked Java Spring Interview Questions with their detailed answers. So that you can crack the interview.
Break or return from Java 8 stream forEach?
Feb 07, 2025 pm 12:09 PM
Java 8 introduces the Stream API, providing a powerful and expressive way to process data collections. However, a common question when using Stream is: How to break or return from a forEach operation? Traditional loops allow for early interruption or return, but Stream's forEach method does not directly support this method. This article will explain the reasons and explore alternative methods for implementing premature termination in Stream processing systems. Further reading: Java Stream API improvements Understand Stream forEach The forEach method is a terminal operation that performs one operation on each element in the Stream. Its design intention is
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
TimeStamp to Date in Java
Aug 30, 2024 pm 04:28 PM
Guide to TimeStamp to Date in Java. Here we also discuss the introduction and how to convert timestamp to date in java along with examples.
Java Program to Find the Volume of Capsule
Feb 07, 2025 am 11:37 AM
Capsules are three-dimensional geometric figures, composed of a cylinder and a hemisphere at both ends. The volume of the capsule can be calculated by adding the volume of the cylinder and the volume of the hemisphere at both ends. This tutorial will discuss how to calculate the volume of a given capsule in Java using different methods. Capsule volume formula The formula for capsule volume is as follows: Capsule volume = Cylindrical volume Volume Two hemisphere volume in, r: The radius of the hemisphere. h: The height of the cylinder (excluding the hemisphere). Example 1 enter Radius = 5 units Height = 10 units Output Volume = 1570.8 cubic units explain Calculate volume using formula: Volume = π × r2 × h (4
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
Create the Future: Java Programming for Absolute Beginners
Oct 13, 2024 pm 01:32 PM
Java is a popular programming language that can be learned by both beginners and experienced developers. This tutorial starts with basic concepts and progresses through advanced topics. After installing the Java Development Kit, you can practice programming by creating a simple "Hello, World!" program. After you understand the code, use the command prompt to compile and run the program, and "Hello, World!" will be output on the console. Learning Java starts your programming journey, and as your mastery deepens, you can create more complex applications.
How to Run Your First Spring Boot Application in Spring Tool Suite?
Feb 07, 2025 pm 12:11 PM
Spring Boot simplifies the creation of robust, scalable, and production-ready Java applications, revolutionizing Java development. Its "convention over configuration" approach, inherent to the Spring ecosystem, minimizes manual setup, allo
