黄昏的阳光
2018-01-08 13:46:00
记一次JAVA与.net交互DES(CBC模式)加密/解密
| 一：DES加密概念 | |
| DES是一种对称加密(Data Encryption Standard)算法。 | |
| DES算法一般有两个关键点，第一个是加密算法，第二个是数据补位。 | |
| 二：DES算法模式 | |
| ECB模式 | |
| CBC模式 | |
| 这里我就不去介绍两种模式了，想要了解的童鞋请自行google | |
| 由于.net默认采用的是CBC模式 所以以下示例代码都是针对CBC模式的。。(主要是公司都是.net开发 java人少说不上话 别个.net要怎么 就怎么 诶) | |
| java示例代码： | |
| ``` | |
| import sun.misc.BASE64Decoder; | |
| import javax.crypto.Cipher; | |
| import javax.crypto.SecretKey; | |
| import javax.crypto.SecretKeyFactory; | |
| import javax.crypto.spec.DESKeySpec; | |
| import javax.crypto.spec.IvParameterSpec; | |
| import java.security.SecureRandom; | |
| import java.util.Base64; | |
| /** | |
| * <p>Description: DescUtil 与.net配合使用DES 加密/解密工具类 </p> | |
| * <p>Copyright: Copyright (c) 2016 </p> | |
| * <p>Company: @Melody</p> | |
| * | |
| * @author @Melody | |
| * @version 1.0 | |
| * @date 2018/1/5 | |
| */ | |
| public class DescUtil { | |
| private static String KEY = "melody88"; | |
| private final static byte[] IV = new byte[] {0x12, 0x34, 0x56, 0x78, 0x63, 0x86, 0x99, 0x29}; | |
| private static String ENCODE = "utf-8"; | |
| private static String DES = "DES"; | |
| public static void main(String[] args)throws Exception{ | |
| String str = encrypt2("Aa123456"); | |
| System.err.println("加密结果是:" + str); | |
| System.err.println("解密结果是:" + decrypt(str)); | |
| } | |
| /** | |
| * 加密字符串 | |
| * @param src | |
| * @return | |
| * @throws Exception | |
| */ | |
| public static String encrypt2(String src) throws Exception { | |
| src = src.replaceAll("@", "="); | |
| SecureRandom sr = new SecureRandom(); | |
| DESKeySpec ks = new DESKeySpec(KEY.getBytes("UTF-8")); | |
| SecretKeyFactory skf = SecretKeyFactory.getInstance("DES"); | |
| SecretKey sk = skf.generateSecret(ks); | |
| Cipher cip = Cipher.getInstance("DES/CBC/PKCS5Padding");//Cipher.getInstance("DES"); | |
| IvParameterSpec iv2 = new IvParameterSpec(IV); | |
| cip.init(Cipher.ENCRYPT_MODE, sk, iv2);//IV的方式 | |
| //cip.init(Cipher.ENCRYPT_MODE, sk, sr);//没有传递IV | |
| String dest = Base64.getEncoder().encodeToString(cip.doFinal(src.getBytes("UTF-8"))); | |
| return dest.replaceAll("=", "@"); | |
| } | |
| /** | |
| * 解密字符串 | |
| * @param str | |
| * @return | |
| */ | |
| public static String decrypt(String str) { | |
| try { | |
| str = str.replaceAll("@", "="); | |
| BASE64Decoder decoder = new BASE64Decoder(); | |
| byte[] data = decoder.decodeBuffer(str); | |
| // 从原始密匙数据创建一个DESKeySpec对象 | |
| DESKeySpec dks = new DESKeySpec(KEY.getBytes("UTF-8")); | |
| // 创建一个密匙工厂，然后用它把DESKeySpec对象转换成 | |
| // 一个SecretKey对象 | |
| SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); | |
| SecretKey secretKey = keyFactory.generateSecret(dks); | |
| // .net DES 默认是CBC模式。。。。坑 | |
| Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); | |
| IvParameterSpec iv2 = new IvParameterSpec(IV); | |
| // 用密匙初始化Cipher对象 | |
| cipher.init(Cipher.DECRYPT_MODE, secretKey, iv2); | |
| // 正式执行解密操作 | |
| byte decryptedData[] = cipher.doFinal(data); | |
| return new String(decryptedData); | |
| } catch (Exception e) { | |
| e.printStackTrace(); | |
| } | |
| return null; | |
| } | |
| } | |
| ``` | |
已有1人打赏
最近浏览
