Java之3DES（Triple DES）加密计算（DESede/ECB/ZeroPadding）

Java环境本身并不直接支持DESede/ECB/ZeroPadding。
不过，可以通过以下几种方式来实现DESede/ECB/ZeroPadding：

1. 手动实现填充和去除填充：如前面示例代码所示，在加密之前进行填充，在解密之后去除填充。这是一个通用的方法，可以应用于任何不支持特定填充方式的场景。
2. 使用第三方库：有些第三方库可能会提供对不同填充方式的支持，比如Bouncy Castle。你可以检查最新版本的Bouncy Castle是否支持ZeroPadding，但通常情况下依然需要自己处理这个填充逻辑。

手动填充

package com.alited.project.gateway.sign;import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import java.security.Security;
import java.util.Base64;/*** @author Wen先森* @version 1.0* @date 2024/6/13 14:21* @description: 手动补0*/
public class DesSign2 {public static void main(String[] args) throws Exception {Security.addProvider(new BouncyCastleProvider());// 自定义3DES密钥字符串（24字节长）String customKeyString = "123456789012345678901234"; // 24字节的密钥byte[] keyBytes = customKeyString.getBytes();// 根据密钥字符串生成SecretKey对象SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DESede");SecretKey secretKey = secretKeyFactory.generateSecret(new DESedeKeySpec(keyBytes));// 原始数据String originalData = "Hello, 3DES!";System.out.println("原始数据: " + originalData);// 加密String encryptedData = encrypt(originalData, secretKey);System.out.println("加密后数据: " + encryptedData);// 解密String decryptedData = decrypt(encryptedData, secretKey);System.out.println("解密后数据: " + decryptedData);}/*** 手动实现ZeroPadding*/private static byte[] zeroPad(byte[] data, int blockSize) {int paddingLength = blockSize - (data.length % blockSize);byte[] paddedData = new byte[data.length + paddingLength];System.arraycopy(data, 0, paddedData, 0, data.length);return paddedData;}/*** 去除ZeroPadding*/private static byte[] removeZeroPadding(byte[] data) {int i = data.length - 1;while (i >= 0 && data[i] == 0) {i--;}byte[] unpaddedData = new byte[i + 1];System.arraycopy(data, 0, unpaddedData, 0, i + 1);return unpaddedData;}/*** 加密方法*/public static String encrypt(String data, SecretKey key) throws Exception {Cipher cipher = Cipher.getInstance("DESede/ECB/NoPadding", "BC");cipher.init(Cipher.ENCRYPT_MODE, key);byte[] paddedData = zeroPad(data.getBytes(), cipher.getBlockSize());byte[] encryptedBytes = cipher.doFinal(paddedData);return Base64.getEncoder().encodeToString(encryptedBytes);}/*** 解密方法*/public static String decrypt(String data, SecretKey key) throws Exception {Cipher cipher = Cipher.getInstance("DESede/ECB/NoPadding", "BC");cipher.init(Cipher.DECRYPT_MODE, key);byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(data));byte[] unpaddedData = removeZeroPadding(decryptedBytes);return new String(unpaddedData);}
}

使用第三方库

首先，确保你已经在 Maven 项目中添加了 Bouncy Castle 的依赖：

<dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk15on</artifactId><version>1.68</version>
</dependency>

然后使用第三方库自带的零填充方法

package com.alited.project.gateway.sign;import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import java.security.Security;
import java.util.*;/*** @author Wen先森* @version 1.0* @date 2024/6/13 14:21* @description:*/
public class DesSign {public static void main(String[] args) throws Exception {Security.addProvider(new BouncyCastleProvider());// 自定义3DES密钥字符串（24字节长）String customKeyString = "123456789012345678901234"; // 24字节的密钥byte[] keyBytes = customKeyString.getBytes();// 根据密钥字符串生成SecretKey对象SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DESede");SecretKey secretKey = secretKeyFactory.generateSecret(new DESedeKeySpec(keyBytes));// 原始数据String originalData = "Hello, 3DES!";System.out.println("原始数据: " + originalData);// 加密String encryptedData = encrypt(originalData, secretKey);System.out.println("加密后数据: " + encryptedData);// 解密String decryptedData = decrypt(encryptedData, secretKey);System.out.println("解密后数据: " + decryptedData);}/*** 加密方法*/public static String encrypt(String data, SecretKey key) throws Exception {Cipher cipher = Cipher.getInstance("DESede/ECB/ZeroBytePadding", "BC");cipher.init(Cipher.ENCRYPT_MODE, key);byte[] encryptedBytes = cipher.doFinal(data.getBytes());return Base64.getEncoder().encodeToString(encryptedBytes);}/*** 解密方法*/public static String decrypt(String data, SecretKey key) throws Exception {Cipher cipher = Cipher.getInstance("DESede/ECB/ZeroBytePadding", "BC");cipher.init(Cipher.DECRYPT_MODE, key);byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(data));return new String(decryptedBytes);}
}