在unity c#中加密RijndaelManaged 128，在Node.JS中解密

本文关键字：Node JS 解密 RijndaelManaged unity 加密 | 更新日期: 2023-09-27 18:17:54

我正在寻找一种方法在统一c#中加密字节数组并在node.js服务器上解密。

我对任何实现都持开放态度，但我目前已经使用了以下加密/解密统一的代码，但我收到错误:

TypeError: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length

当解密使用RijndaelManaged 128统一加密的文件

查找加密和解密代码:

Unity c# Encrypt

private void GenerateEncryptionKey(string userID)
{
    //Generate the Salt, with any custom logic and using the user's ID
    StringBuilder salt = new StringBuilder();
    for (int i = 0; i < 8; i++)
    {
        salt.Append("," + userID.Length.ToString());
    }
    Rfc2898DeriveBytes pwdGen = new Rfc2898DeriveBytes (Encoding.UTF8.GetBytes(userID), Encoding.UTF8.GetBytes(salt.ToString()), 100);
    m_cryptoKey = pwdGen.GetBytes(KEY_SIZE / 8);
    m_cryptoIV = pwdGen.GetBytes(KEY_SIZE / 8);
}
public void Save(string path)
{
    string json = MiniJSON.Json.Serialize(m_saveData);
    using (RijndaelManaged crypto = new RijndaelManaged())
    {
        crypto.BlockSize = KEY_SIZE;
        crypto.Padding = PaddingMode.PKCS7;
        crypto.Key = m_cryptoKey;
        crypto.IV = m_cryptoIV;
        crypto.Mode = CipherMode.CBC;
        ICryptoTransform encryptor = crypto.CreateEncryptor(crypto.Key, crypto.IV);
        byte[] compressed = null;
        using (MemoryStream compMemStream = new MemoryStream())
        {
            using (StreamWriter writer = new StreamWriter(compMemStream, Encoding.UTF8))
            {
                writer.Write(json);
                writer.Close();
                compressed = compMemStream.ToArray();
            }
        }
        if (compressed != null)
        {
            using (MemoryStream encMemStream = new MemoryStream(compressed))
            {
                using (CryptoStream cryptoStream = new CryptoStream(encMemStream, encryptor, CryptoStreamMode.Write))
                {
                    using (FileStream fs = File.Create(GetSavePath(path)))
                    {
                        byte[] encrypted = encMemStream.ToArray();
                        fs.Write(encrypted, 0, encrypted.Length);
                        fs.Close();
                    }
                }
            }
        }
    }
}

忽略被压缩的位，我最终将压缩数据进行加密，但在本例中我已经删除了它。

node . js解密

var sUserID = "hello-me";
var sSalt = "";
for (var i = 0; i < 8; i++)
{
    sSalt += "," + sUserID.length;
}
var KEY_SIZE = 128;
crypto.pbkdf2(sUserID, sSalt, 100, KEY_SIZE / 4, function(cErr, cBuffer){
    var cKey = cBuffer.slice(0, cBuffer.length / 2);
    var cIV = cBuffer.slice(cBuffer.length / 2, cBuffer.length);
    fs.readFile("save.sav", function (cErr, cData){
        try
        {
            var cDecipher = crypto.createDecipheriv("AES-128-CBC", cKey, cIV);
            var sDecoded = cDecipher.update(cData, null, "utf8");
            sDecoded += cDecipher.final("utf8");
            console.log(sDecoded);
        }
        catch(e)
        {
            console.log(e.message);
            console.log(e.stack);
        }
    });
});

我认为问题与填充有关!我没有使用:

cryptoStream.FlushFinalBlock();

当保存文件在c#土地，因为某种原因后，c#不能解密它了，它并没有真正对节点解密它的能力的影响，但也许我只是错过了一些东西在它的填充解密?

感谢您的帮助

在unity c#中加密RijndaelManaged 128，在Node.JS中解密

一个问题是，您使用的PasswordDeriveBytes，根据本文是PBKDF1，而Rfc2898DeriveBytes是PBKDF2。您正在节点脚本中使用PBKDF2。

然后你应该检查你的key和cIV值在c#和node之间是否匹配。

在使用RijndaelManaged进行加密和解密时，操作顺序似乎非常重要。

下面是在Unity中加密和解密的代码，并与问题中发布的node.js代码一起工作。

public void Save(string path)
{
    string json = MiniJSON.Json.Serialize(m_saveData);
    using (RijndaelManaged crypto = new RijndaelManaged())
    {
        crypto.BlockSize = KEY_SIZE;
        crypto.Padding = PaddingMode.PKCS7;
        crypto.Key = m_cryptoKey;
        crypto.IV = m_cryptoIV;
        crypto.Mode = CipherMode.CBC;
        ICryptoTransform encryptor = crypto.CreateEncryptor(crypto.Key, crypto.IV);
        byte[] compressed = null;
        using (MemoryStream compMemStream = new MemoryStream())
        {
            using (StreamWriter writer = new StreamWriter(compMemStream, Encoding.UTF8))
            {
                writer.Write(json);
                writer.Close();
                //compressed = CLZF2.Compress(compMemStream.ToArray());
                compressed = compMemStream.ToArray();
            }
        }
        if (compressed != null)
        {
            using (MemoryStream encMemStream = new MemoryStream())
            {
                using (CryptoStream cryptoStream = new CryptoStream(encMemStream, encryptor, CryptoStreamMode.Write))
                {
                    cryptoStream.Write(compressed, 0, compressed.Length);
                    cryptoStream.FlushFinalBlock();
                    using (FileStream fs = File.Create(GetSavePath(path)))
                    {
                        encMemStream.WriteTo(fs);
                    }
                }
            }
        }
    }
}
public void Load(string path)
{
    path = GetSavePath(path);
    try
    {
        byte[] decrypted = null;
        using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
        {
            using (RijndaelManaged crypto = new RijndaelManaged())
            {
                crypto.BlockSize = KEY_SIZE;
                crypto.Padding = PaddingMode.PKCS7;
                crypto.Key = m_cryptoKey;
                crypto.IV = m_cryptoIV;
                crypto.Mode = CipherMode.CBC;
                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = crypto.CreateDecryptor(crypto.Key, crypto.IV);
                using (CryptoStream cryptoStream = new CryptoStream(fs, decryptor, CryptoStreamMode.Read))
                {
                    using (MemoryStream decMemStream = new MemoryStream())
                    {
                        var buffer = new byte[512];
                        var bytesRead = 0;
                        while ((bytesRead = cryptoStream.Read(buffer, 0, buffer.Length)) > 0)
                        {
                            decMemStream.Write(buffer, 0, bytesRead);
                        }
                        //decrypted = CLZF2.Decompress(decMemStream.ToArray());
                        decrypted = decMemStream.ToArray();
                    }
                }
            }
        }
        if (decrypted != null)
        {
            using (MemoryStream jsonMemoryStream = new MemoryStream(decrypted))
            {
                using (StreamReader reader = new StreamReader(jsonMemoryStream))
                {
                    string json = reader.ReadToEnd();
                    Dictionary<string, object> saveData = MiniJSON.Json.Deserialize(json) as Dictionary<string, object>;
                    if (saveData != null)
                    {
                        m_saveData = saveData;
                    }
                    else
                    {
                        Debug.LogWarning("Trying to load invalid JSON file at path: " + path);
                    }
                }
            }
        }
    }
    catch (FileNotFoundException e)
    {
        Debug.LogWarning("No save file found at path: " + path);
    }
}
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