.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 = 0; //size_t  是操作符sizeof返回的结果类型
    size_t dataOutMoved = 0;
    
    dataOutAvailable = (dataInLength + kCCBlockSizeDES) & ~(kCCBlockSizeDES - 1);
    dataOut = malloc( dataOutAvailable * sizeof(uint8_t));
    memset((void *)dataOut, 00, 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];
}