在Unity中加密,在Node.js中解密

时间:2014-01-21 11:04:21

标签: c# javascript node.js encryption unity3d

我正在尝试将一些数据从Unity发送到Node.js express服务器,反之亦然。

这是我在C#中的Unity代码:

public string Encrypt(string toEncrypt, string key, bool useHashing) 
{     

    byte[] keyArray;     
    byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);      

    if (useHashing){               
        MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
        keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));     
    }     
    else {
        keyArray = UTF8Encoding.UTF8.GetBytes(key);      
    }

    var tdes = new TripleDESCryptoServiceProvider();
    tdes.Key = keyArray;
    //tdes.Mode = CipherMode.CBC;  // which is default     
    //tdes.Padding = PaddingMode.PKCS7;  // which is default

    ICryptoTransform cTransform = tdes.CreateEncryptor();     
    byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
    tdes.Clear();
    return Convert.ToBase64String(resultArray, 0, resultArray.Length); 

}

    Dictionary<string, string> data = new Dictionary<string, string>();
    data.Add("Test01", "Tanmoy");
    data.Add("Test02", "Mitra");
    string json = Json.Serialize(data);

    byte[] postData = Encoding.UTF8.GetBytes(Encrypt(json, "12345", true));

    StartCoroutine(HttpPost("test", postData, delegate(string requestError, IDictionary rData) {
        cb(null,rData);
    }));

这是我的Node.js代码:

var alg = 'des-ede3-cbc';
var key = new Buffer('123456789012345678901234', 'utf-8');
var iv = new Buffer(m_strApiPass, 'base64');

var encrypted = new Buffer(reqString, 'base64');

var decipher = crypto.createDecipheriv(alg, key, iv);
var decoded = decipher.update(encrypted, 'binary', 'ascii');
decoded += decipher.final('ascii');

我收到此错误:

  

TypeError:错误:0606506D:数字包络例程:EVP_DecryptFinal_ex:错误的最终块长度

我注意到,在C#中,我得到了以下字符串,

pySqIdAiJpDOW7XkOQDoblLOtZ382J1G1F1UE16W0Ulg+x5X0Bocjg==

但是当我将此字符串发送到Node.js时,它变为:

pySqIdAiJpDOW7XkOQDoblLOtZ382J1G1F1UE16W0Ulg x5X0Bocjg  

问题是什么?

1 个答案:

答案 0 :(得分:1)

原因很简单:返回的密文由任意观察者的随机字节组成。这意味着其中有些字节不映射到字符。这些字节中的信息将丢失。

如果在传输过程中需要字符串,则base 64会对您的密文进行编码,然后在接收方再次对其进行解码。