.net 安卓IOS跨平台des加解密双向的（可以互相加解密）

 #region   跨平台加解密（c# 安卓 IOS）

       //  public static string sKey = "12345678";

       //  /// 

       //  /// 解密

       //  /// 

       //  /// 要解密的以Base64

       //  /// 密钥，且必须为8位

       //  /// 已解密的字符串

       //  public static string DesDecrypt(string pToDecrypt)

       //  {

       //      //转义特殊字符

       //      pToDecrypt = pToDecrypt.Replace("-", "+");

       //      pToDecrypt = pToDecrypt.Replace("_", "/");

       //      pToDecrypt = pToDecrypt.Replace("~", "=");

       //      byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);

       //      using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())

       //      {

       //          des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

       //          des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

       //          System.IO.MemoryStream ms = new System.IO.MemoryStream();

       //          using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))

       //          {

       //              cs.Write(inputByteArray, 0, inputByteArray.Length);

       //              cs.FlushFinalBlock();

       //              cs.Close();

       //          }

       //          string str = Encoding.UTF8.GetString(ms.ToArray());

       //          ms.Close();

       //          return str;

       //      }

       //  }

       //  /// 

       //  /// 对字符串进行DES加密

       //  /// 

       //  /// 待加密的字符串

       //  /// 加密后的BASE64编码的字符串

       //  public string Encrypt(string sourceString)

       //{

       //   byte[] btKey = Encoding.UTF8.GetBytes(sKey);

       //   byte[] btIV = Encoding.UTF8.GetBytes(sKey);

       //    DESCryptoServiceProvider des = new DESCryptoServiceProvider();

       //    using (MemoryStream ms = new MemoryStream())

       //    {

       //        byte[] inData = Encoding.UTF8.GetBytes(sourceString);

       //        try

       //        {

       //            using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))

       //            {

       //                cs.Write(inData, 0, inData.Length);

       //                cs.FlushFinalBlock();

       //            }

       //            return Convert.ToBase64String(ms.ToArray());

       //        }

       //        catch

       //        {

       //            throw;

       //        }

       //    }

       //}

         #endregion  

 安卓---------------------------------------------------------------------------

     //    // 加密

     //public static String DecryptDoNet(String message, String key)

     //        throws Exception {

     //    byte[] bytesrc = Base64.decode(message.getBytes(), Base64.DEFAULT);

     //    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);

     //}

     //// 解密

     //public static String EncryptAsDoNet(String message, String key)

     //        throws Exception {

     //    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.ENCRYPT_MODE, secretKey, iv);

     //    byte[] encryptbyte = cipher.doFinal(message.getBytes());

     //    return new String(Base64.encode(encryptbyte, Base64.DEFAULT));

     //}

 Ios --------------------------------------------------------------------------------------------------------------------\

 static const char* encryptWithKeyAndType(const char *text,CCOperation encryptOperation,char *key)
 {
     NSString *textString=[[NSString alloc]initWithCString:text encoding:NSUTF8StringEncoding];
     //      NSLog(@"[[item.url description] UTF8String=%@",textString);
     const void *dataIn;
     size_t dataInLength;

     if (encryptOperation == kCCDecrypt)//传递过来的是decrypt 解码
     {
         //解码 base64
         NSData *decryptData = [GTMBase64 decodeData:[textString dataUsingEncoding:NSUTF8StringEncoding]];//转成utf-8并decode
         dataInLength = [decryptData length];
         dataIn = [decryptData bytes];
     }
     else  //encrypt
     {
         NSData* encryptData = [textString dataUsingEncoding:NSUTF8StringEncoding];
         dataInLength = [encryptData length];
         dataIn = (const void *)[encryptData bytes];
     }

     CCCryptorStatus ccStatus;
     uint8_t *dataOut = NULL; //可以理解位type/typedef 的缩写（有效的维护了代码，比如：一个人用int，一个人用long。最好用typedef来定义）
     size_t dataOutAvailable = ; //size_t  是操作符sizeof返回的结果类型
     size_t dataOutMoved = ;

     dataOutAvailable = (dataInLength + kCCBlockSizeDES) & ~(kCCBlockSizeDES - );
     dataOut = malloc( dataOutAvailable * sizeof(uint8_t));
     memset((void *)dataOut, , dataOutAvailable);//将已开辟内存空间buffer的首 1 个字节的值设为值 0

     //NSString *initIv = @"12345678";
     const void *vkey = key;
     const void *iv = (const void *) key; //[initIv UTF8String];

     //CCCrypt函数 加密/解密
     ccStatus = CCCrypt(encryptOperation,//  加密/解密
                        kCCAlgorithmDES,//  加密根据哪个标准（des，3des，aes。。。。）
                        kCCOptionPKCS7Padding,//  选项分组密码算法(des:对每块分组加一次密  3DES：对每块分组加三个不同的密)
                        vkey,  //密钥    加密和解密的密钥必须一致
                        kCCKeySizeDES,//   DES 密钥的大小（kCCKeySizeDES=8）
                        iv, //  可选的初始矢量
                        dataIn, // 数据的存储单元
                        dataInLength,// 数据的大小
                        (void *)dataOut,// 用于返回数据
                        dataOutAvailable,
                        &dataOutMoved);

     NSString *result = nil;

     if (encryptOperation == kCCDecrypt)//encryptOperation==1  解码
     {
         //得到解密出来的data数据，改变为utf-8的字符串
         result = [[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved] encoding:NSUTF8StringEncoding];
     }
     else //encryptOperation==0  （加密过程中，把加好密的数据转成base64的）
     {
         //编码 base64
         NSData *data = [NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved];
         result = [GTMBase64 stringByEncodingData:data];
     }

     return [result UTF8String];

 }
 +(NSString*)encryptWithContent:(NSString*)content type:(CCOperation)type key:(NSString*)aKey
 {
     const char * contentChar =[content UTF8String];
     char * keyChar =(char*)[aKey UTF8String];
     const char *miChar;
     miChar = encryptWithKeyAndType(contentChar, type, keyChar);
     return  [NSString stringWithCString:miChar encoding:NSUTF8StringEncoding];
 }