DES对称加密算法的简单实现

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网上看到的都是用了第三方包的，我这里写了个纯java无依赖的

环境

1. JDK11
2. Windows7
3. VS Code

代码

源代码都发布在Gitee上了

import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Base64;import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;/*** DES算法实现*/
public class DES {/*** iv向量*/private static final byte[] DESIV = { (byte) 0xCE, (byte) 0x35, (byte) 0x5,(byte) 0xD, (byte) 0x98, (byte) 0x91, (byte) 0x8, (byte) 0xA };/*** AlgorithmParameterSpec*/private static AlgorithmParameterSpec IV = null;/*** 加密模式*/private static final int ENCRYPT_MODE = 1;/*** 解密模式*/private static final int DECRYPT_MODE = 2;/*** 密钥*/private Key key;public DES(String str) {getKey(str);}public Key getKey() {return key;}public void setKey(Key key) {this.key = key;}/*** 通过密钥获得key* @param secretKey 密钥*/public void getKey(String secretKey) {try {SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");secureRandom.setSeed(secretKey.getBytes());KeyGenerator generator = null;try {generator = KeyGenerator.getInstance("DES");} catch (NoSuchAlgorithmException e) {}generator.init(secureRandom);IV = new IvParameterSpec(DESIV);this.key = generator.generateKey();generator = null;} catch (Exception e) {throw new RuntimeException("Error in getKey(String secretKey), Cause: " + e);}}/*** 字符串des加密* @param data 需要加密的字符串* @return 加密结果* @throws Exception 异常*/public byte[] encrypt(byte[] data) throws Exception {Cipher cipher = getPattern(ENCRYPT_MODE);return cipher.doFinal(data);}/*** 字符串des解密* @param data 需要解密的字符串* @return 解密结果* @throws Exception 异常*/public byte[] decrypt(byte[] data) throws Exception {Cipher cipher = getPattern(DECRYPT_MODE);return cipher.doFinal(data);}/*** 初始化cipher* @param cipherMode cipher工作模式 1：加密； 2：解密* @return cipher* @throws Exception 异常*/private Cipher getPattern(int cipherMode) throws Exception {Cipher cipher;cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");cipher.init(cipherMode, key, IV);return cipher;}public static void main(String[] args) throws Exception {String testString = "I am YiMi";DES des = new DES("blockchain");   // 秘钥String stringMi = Base64.getEncoder().encodeToString(des.encrypt(testString.getBytes()));System.out.println("密文：" + stringMi);byte[] stringMing = des.decrypt(Base64.getDecoder().decode(stringMi));System.out.println("明文：" + new String(stringMing));}}

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