JAVA DES加解密

最新推荐文章于 2025-09-05 16:34:31 发布

转载最新推荐文章于 2025-09-05 16:34:31 发布 · 84 阅读

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CC 4.0 BY-SA版权

原文链接：https://my.oschina.net/maliang9527/blog/1932304

文章标签：

#java #python

本文提供了一个Java实现的DES加密与解密的具体示例，包括如何使用DESKeySpec及SecretKeyFactory创建密钥，利用Cipher进行加密和解密操作，并通过Base64进行编码与解码。

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package com.moonstudio;



import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;



public class Des {
	public static void main(String[] args)  {
	Des des = 	new Des();
		String s;
		try {
			s = des.encrypt("helloaaaaaaa",DES_KEY_STRING);
			System.out.println("解密后##"+des.decrypt("f+1m86kIcRtae2PbrBkkZw==", DES_KEY_STRING));
			System.out.println(s);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	 public final static String DES_KEY_STRING = "八位密匙";
     
	    public static String encrypt(String message, String key) throws Exception {
	        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
	 
	        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
	 
	        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
	        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
	        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
	        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
	 
	        return encodeBase64(cipher.doFinal(message.getBytes("UTF-8")));
	    }
	 
	    public static String decrypt(String message, String key) throws Exception {
	 
	        byte[] bytesrc = decodeBase64(message);//convertHexString(message);
	        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
	        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
	        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
	        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
	        IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
	 
	        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
	 
	        byte[] retByte = cipher.doFinal(bytesrc);
	        return new String(retByte);
	    }
	 
	    public static byte[] convertHexString(String ss) {
	        byte digest[] = new byte[ss.length() / 2];
	        for (int i = 0; i < digest.length; i++) {
	            String byteString = ss.substring(2 * i, 2 * i + 2);
	            int byteValue = Integer.parseInt(byteString, 16);
	            digest[i] = (byte) byteValue;
	        }
	 
	        return digest;
	    }
	 
	    public static String toHexString(byte b[]) {
	        StringBuffer hexString = new StringBuffer();
	        for (int i = 0; i < b.length; i++) {
	            String plainText = Integer.toHexString(0xff & b[i]);
	            if (plainText.length() < 2)
	                plainText = "0" + plainText;
	            hexString.append(plainText);
	        }
	 
	        return hexString.toString();
	    }
	 
	     
	    public static String encodeBase64(byte[] b) {
	    		return Base64.getEncoder().encodeToString(b);
	         
	    }
	     
	    public static byte[] decodeBase64(String base64String) {
	    		return Base64.getDecoder().decode(base64String);
	        
	    }
}

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转载于:https://my.oschina.net/maliang9527/blog/1932304