【Java/DES】使用DES加解密

例程下载：

 https://files.cnblogs.com/files/heyang78/ufo_base64_des_211003am.rar

需要导入的依赖：

        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.15</version>
        </dependency>

程序：

package ufo;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class DES_Test {
    public static void main(String... args) {
        String original="Let’s Build a Giant Airship 青海长云暗雪山";
        System.out.println("原文=\t"+original);
        
        try {
            // 生产密钥
            KeyGenerator kgen = KeyGenerator.getInstance("DES");
            kgen.init(56);            
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "DES");// 密钥，下面加密解密都要用到
            System.out.println("密钥=\t"+Base64.encodeBase64String(key.getEncoded()));
            
            // 加密
            Cipher cipherEncode = Cipher.getInstance("DES");
            byte[] byteContent = original.getBytes();
            cipherEncode.init(Cipher.ENCRYPT_MODE, key);
            byte[] EncodeResults = cipherEncode.doFinal(byteContent);
            System.out.println("密文=\t"+Base64.encodeBase64String(EncodeResults));
            
            // 解密
            Cipher cipherDecode = Cipher.getInstance("DES");// 创建密码器
            cipherDecode.init(Cipher.DECRYPT_MODE, key);// 初始化为解密模式的密码器
            byte[] DecodeResults = cipherDecode.doFinal(EncodeResults);
            System.out.println("解密后=\t"+new String(DecodeResults));
            
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

输出：

原文=    Let’s Build a Giant Airship 青海长云暗雪山
密钥=    2nAyzeNe6UA=
密文=    8OQw+fvxDTtlzLabEbfiJPgvJaPLTtDdWd0ALr1CDGetMpvTgEE+K2smBrhVfGBm
解密后=    Let’s Build a Giant Airship 青海长云暗雪山