Android开发实践（六）字符串实现DES加密

老板说要把请求的url信息加密一下，轻轻的一句话，就使得我写下了这篇文章

这里要说明一下，正常的逻辑应该是在app端加密，在服务器端解密，但是这里只贴了app端的加解密，服务器端的加解密就期待我下一篇文章了。。

网上有很多加密的方式和实现代码，但是对于新手的我来说，却研究了不少时间，特别是不熟悉android的调试，出现了一些问题就常常吓出一身冷汗，闲话不说了，上代码

import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec;  public class DESEncrypt { public static String keyStr="CTYSoft0";  private String ivStr="CTYSoft0";   /// <summary>     /// 加密     /// </summary>     /// <param name="EncStr">被加密的字符串</param>     /// <returns>加密后的字符串</returns>     public static String EncyptStr(String EncStr) throws Exception     {         DESEncrypt m = new DESEncrypt();          return m.Encrypt(EncStr,keyStr);          }                     /// <summary>     /// 解密     /// </summary>     /// <param name="EncStr">被加密的字符串</param>     /// <returns>加密后的字符串</returns>     public static String Decrypt(String DncStr) throws Exception     {         DESEncrypt m = new DESEncrypt();          return m.Decrypt(DncStr,keyStr);          }          //java的DES加密     public static String Encrypt(String message, String key) throws Exception      {                      DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));   //根据设定的key生成钥匙           SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");  //创建一个密匙工厂，然后用它把key转换成密钥DESKeySpec          SecretKey secretKey = keyFactory.generateSecret(desKeySpec);                 // SecureRandom random = new SecureRandom();         IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));                      Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");           cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);          //  cipher.init(Cipher.ENCRYPT_MODE, secretKey, random);            return toHexString(cipher.doFinal(message.getBytes("UTF-8")));       }              public static String toHexString(byte b[]) {           StringBuffer hexString = new StringBuffer();           for (int i = 0; i < b.length; i++) {               String plainText = Integer.toHexString(0xff & b[i]);               if (plainText.length() < 2)                   plainText = "0" + plainText;                  hexString.append(plainText);              }            return hexString.toString();             }                  public static String Decrypt(String message, String key) throws Exception {                 byte[] bytesrc = convertHexString(message);           Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");           DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));           SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");           SecretKey secretKey = keyFactory.generateSecret(desKeySpec);           IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));              cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);            byte[] retByte = cipher.doFinal(bytesrc);           return new String(retByte);       }           public static byte[] convertHexString(String ss) {           byte digest[] = new byte[ss.length() / 2];           for (int i = 0; i < digest.length; i++) {               String byteString = ss.substring(2 * i, 2 * i + 2);               int byteValue = Integer.parseInt(byteString, 16);               digest[i] = (byte) byteValue;           }              return digest;       }

测试：

 //加密字符串                DESEncrypt DESEncryptObj=new DESEncrypt();                String afterStrKey=  DESEncryptObj.EncyptStr(KeyStr);                             String DecryptStr=DESEncryptObj.Decrypt(afterStrKey);    //解密可用

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