package com.example.modules.util;import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;
import java.util.Base64; public class EncryptionUtil { // DES加密解密 public static String desEncrypt(String data, String key) throws Exception { SecretKey secretKey = generateDESKey(key); Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, secretKey); byte[] encrypted = cipher.doFinal(data.getBytes()); return Base64.getEncoder().encodeToString(encrypted); } public static String desDecrypt(String encryptedData, String key) throws Exception { SecretKey secretKey = generateDESKey(key); Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, secretKey); byte[] original = cipher.doFinal(Base64.getDecoder().decode(encryptedData)); return new String(original); } private static SecretKey generateDESKey(String key) throws Exception { byte[] keyBytes = key.getBytes(); SecretKeySpec keySpec = new SecretKeySpec(keyBytes, 0, 8, "DES"); return keySpec; } // AES加密解密 public static String aesEncrypt(String data, String key) throws Exception { SecretKey secretKey = generateAESKey(key); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, secretKey); byte[] encrypted = cipher.doFinal(data.getBytes()); return Base64.getEncoder().encodeToString(encrypted); } public static String aesDecrypt(String encryptedData, String key) throws Exception { SecretKey secretKey = generateAESKey(key); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, secretKey); byte[] original = cipher.doFinal(Base64.getDecoder().decode(encryptedData)); return new String(original); } private static SecretKey generateAESKey(String key) throws Exception { byte[] keyBytes = key.getBytes(); SecretKeySpec keySpec = new SecretKeySpec(keyBytes, 0, 16, "AES"); return keySpec; } public static void main(String[] args) { try { String originalText = "Hello, World!"; String desKey = "12345678"; // DES key must be 8 bytes String aesKey = "1234567890123456"; // AES key must be 16 bytes String desEncrypted = desEncrypt(originalText, desKey); String desDecrypted = desDecrypt(desEncrypted, desKey); String aesEncrypted = aesEncrypt(originalText, aesKey); String aesDecrypted = aesDecrypt(aesEncrypted, aesKey); System.out.println("DES Original: " + originalText); System.out.println("DES Encrypted: " + desEncrypted); System.out.println("DES Decrypted: " + desDecrypted); System.out.println("AES Original: " + originalText); System.out.println("AES Encrypted: " + aesEncrypted); System.out.println("AES Decrypted: " + aesDecrypted); } catch (Exception e) { e.printStackTrace(); } }
}
