Java實現3DES加密

生成秘鑰簡單粗暴

import java.io.UnsupportedEncodingException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

/**  

* @ClassName: SecretKeyUtils  

* 各秘鑰生成

* @author zhupig3028

* @date 2022年5月10日  
  

*/
public class SecretKeyUtils {
    
    /** AES秘鑰 */
    private static final String AES_ALGORITHM = "AES";
    
    /** 3DES秘鑰 */
    private static final String DES_ALGORITHM = "DESede";

    /** 秘鑰生成來源 */
    public static final String ALLCHAR = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    
    /**
     * 生成AES密鑰對象
     * @throws NoSuchAlgorithmException 
     */
    public static String generateAESKey() throws NoSuchAlgorithmException, UnsupportedEncodingException {
        StringBuffer sb = new StringBuffer();
        Random random = new Random();
        for (int i = 0; i < 16; i++) {
            sb.append(ALLCHAR.charAt(random.nextInt(ALLCHAR.length())));
        }
        return sb.toString();
    }

    /**
     * 生成3DES密鑰對象
     */
    public static String generate3DESKey() {
        StringBuffer sb = new StringBuffer();
        Random random = new Random();
        for (int i = 0; i < 24; i++) {
            sb.append(ALLCHAR.charAt(random.nextInt(ALLCHAR.length())));
        }
        return sb.toString();
    }

    /**
     * 隨機生成RSA秘鑰
     * @throws NoSuchAlgorithmException
     */
    public static Map<String,String > genKeyPair() throws NoSuchAlgorithmException {
        HashMap<String, String> stringStringHashMap = new HashMap<>();
        // KeyPairGenerator類用於生成公鑰和私鑰對，基於RSA演算法生成對象
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
        // 初始化密鑰對生成器，密鑰大小為96-1024位
        keyPairGen.initialize(1024,new SecureRandom());
        // 生成一個密鑰對，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        // 得到私鑰
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        // 得到公鑰
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        String publicKeyString = new String(Base64.getEncoder().encodeToString(publicKey.getEncoded()));
        // 得到私鑰字元串
        String privateKeyString = new String(Base64.getEncoder().encodeToString((privateKey.getEncoded())));
        // 將公鑰和私鑰保存到Map
        //0表示公鑰
        stringStringHashMap.put("0",publicKeyString);
        //1表示私鑰
        stringStringHashMap.put("1",privateKeyString);
        return stringStringHashMap;
    }

}

Java實現3DES加解密（這裡採用了ECB模式，填充模式為pkcs5padding）ECB模式沒有偏移量

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

/**
 * @author zhupig3028
 * @date 2022/5/10 14:25
 * 3DES加密工具類
 */
public class ThreeDESUtils {

    /**
     * 加解密統一編碼方式
     */
    private final static String ENCODING = "utf-8";

    /**
     * 加解密方式
     */
    private final static String ALGORITHM  = "DESede";

    /**
     *加密模式及填充方式
     */
    private final static String PATTERN = "DESede/ECB/pkcs5padding";

    /**
     * 3DES加密
     *
     * @param plainText 普通文本
     * @param sK 秘鑰
     * @return
     * @throws Exception
     */
    public static String encode(String plainText,String sK) throws Exception {
        SecretKey secretKey = new SecretKeySpec(sK.getBytes(ENCODING), ALGORITHM);
        // 3DES加密採用pkcs5padding填充
        Cipher cipher = Cipher.getInstance(PATTERN);
        // 用密匙初始化Cipher對象
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        // 執行加密操作
        byte[] encryptData = cipher.doFinal(plainText.getBytes(ENCODING));
        return Base64.getEncoder().encodeToString(encryptData);
    }

    /**
     * 3DES解密
     *
     * @param encryptText 加密文本
     * @return
     * @throws Exception
     */
    public static String decode(String encryptText, String sK) throws Exception {
        SecretKey secretKey = new SecretKeySpec(sK.getBytes(ENCODING), ALGORITHM);
        // 3DES加密採用pkcs5padding填充
        Cipher cipher = Cipher.getInstance(PATTERN);

        // 用密匙初始化Cipher對象
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        // 正式執行解密操作
        byte[] decryptData = cipher.doFinal(Base64.getDecoder().decode(encryptText));
        return new String(decryptData, ENCODING);
    }

}