C# MD5加密中的特殊字符

我在C#和SQL Server中遇到了MD5加密问题，它只发生在具有特殊字符的行上

下面是c#中的代码：

然后将其与我在C#中创建的哈希进行比较，以检查数据库中数据的完整性。这对于没有特殊字符的所有行都非常有效，但对于包含任何特殊字符（如é或ö）的所有行都无效

这是我不久前遇到的一个问题，但任务因其他优先级而暂停，我不记得我已经尝试过什么解决方案，我记得我尝试过一些改变C#中字符串编码的解决方案，但没有一个有效

我做错了什么

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提前感谢。

我在代码中使用这种加密和解密方法，我已经用特殊字符进行了测试，它的工作对我来说很好。我会给你我的代码plz测试这一次，我希望它会工作你

TableFilter是一个公共类文件，该文件包含加密和解密方法。除此之外，您无法在.cs页上编写这两个方法

public static string Encrypt(string toEncrypt, bool useHashing = true)
    {
        byte[] keyArray;
        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

        System.Configuration.AppSettingsReader settingsReader =
                                            new AppSettingsReader();
        // Get the key from config file

        string key = (string)settingsReader.GetValue("EncryptionKey",
                                                         typeof(String));
        //System.Windows.Forms.MessageBox.Show(key);
        //If hashing use get hashcode regards to your key
        if (useHashing)
        {
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
            //Always release the resources and flush data
            // of the Cryptographic service provide. Best Practice

            hashmd5.Clear();
        }
        else
            keyArray = UTF8Encoding.UTF8.GetBytes(key);

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        //set the secret key for the tripleDES algorithm
        tdes.Key = keyArray;
        //mode of operation. there are other 4 modes.
        //We choose ECB(Electronic code Book)
        tdes.Mode = CipherMode.ECB;
        //padding mode(if any extra byte added)

        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateEncryptor();
        //transform the specified region of bytes array to resultArray
        byte[] resultArray =
          cTransform.TransformFinalBlock(toEncryptArray, 0,
          toEncryptArray.Length);
        //Release resources held by TripleDes Encryptor
        tdes.Clear();
        //Return the encrypted data into unreadable string format
        return Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }

    public static string Decrypt(string cipherString, bool useHashing = true)
    {
        byte[] keyArray;
        //get the byte code of the string

        byte[] toEncryptArray = Convert.FromBase64String(cipherString);

        System.Configuration.AppSettingsReader settingsReader =
                                            new AppSettingsReader();
        //Get your key from config file to open the lock!
        string key = (string)settingsReader.GetValue("EncryptionKey",
                                                     typeof(String));

        if (useHashing)
        {
            //if hashing was used get the hash code with regards to your key
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
            //release any resource held by the MD5CryptoServiceProvider

            hashmd5.Clear();
        }
        else
        {
            //if hashing was not implemented get the byte code of the key
            keyArray = UTF8Encoding.UTF8.GetBytes(key);
        }

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        //set the secret key for the tripleDES algorithm
        tdes.Key = keyArray;
        //mode of operation. there are other 4 modes. 
        //We choose ECB(Electronic code Book)

        tdes.Mode = CipherMode.ECB;
        //padding mode(if any extra byte added)
        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateDecryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(
                             toEncryptArray, 0, toEncryptArray.Length);
        //Release resources held by TripleDes Encryptor                
        tdes.Clear();
        //return the Clear decrypted TEXT
        return UTF8Encoding.UTF8.GetString(resultArray);
    }

：用于文本框字符串（代替txtpassword.text put testingé123ö以便于理解）

：Web.config

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最后，我无法使用MD5找到一个好的解决方案，我转到了SHA256，它使用了以下答案：

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看起来您已经将

nvarchar

数据压缩为

varchar

，这是肯定的：将破坏许多非ASCII字符。尝试在整个过程中使用

nvarchar

？另外：“从SQL Server 2016（13.x）开始，除SHA2_256和SHA2_512之外的所有算法都已弃用。较旧的算法（不推荐）将继续工作，但会引发弃用事件。”-服务器不希望您为此使用MD5。您的用户不希望您为此使用MD5。并且：它要求您发送超出必要范围的未加密密码。在我看来，您应该尽快使用salt和强（读：慢）散列算法（如PBKDF2、bcrypt或scrypt.var encoding=new ascienceoding（））进行散列，可能是立即在应用层进行；将删除不可打印的字符。@jdweng它肯定会删除任何非ASCII字符，你说得对；使用控制字符应该没问题，但如果不是对密码进行哈希运算，请重命名该函数。如果您实际上是在对密码进行哈希运算，请停止使用MD5。注意，加密与散列不同（即使散列是加密散列）；不正确地使用这些词可能会引起一些混淆。您通常不会加密散列。对行数据进行散列不需要安全地进行，如果散列只是用于在其他受信任的环境中加速查找或检测差异，但对密码进行散列没有这样的借口。

CONVERT(VARCHAR(32), HashBytes('MD5',CONVERT(VARCHAR(MAX),CONVERT(VARCHAR(MAX),ISNULL([Field1],''))+ISNULL([Field2],'')+ISNULL([Field3],'')+CONVERT(VARCHAR(MAX),ISNULL([Field4],''))+ISNULL(CONVERT(VARCHAR(MAX),[Field5]),'')+ISNULL(CONVERT(VARCHAR(MAX),Field6]),'')+CONVERT(VARCHAR(MAX),Field7]))+SUBSTRING(CONVERT(VARCHAR(32),HashBytes('MD5',CONVERT(VARCHAR(MAX),CONVERT(VARCHAR(MAX),ISNULL([Field1],''))+ISNULL([Field2],'')+ISNULL([Field3],'')+CONVERT(VARCHAR(MAX),ISNULL([Field4],''))+ISNULL(CONVERT(VARCHAR(MAX),Field5]),'')+ISNULL(CONVERT(VARCHAR(MAX),[Field6]),'')+CONVERT(VARCHAR(MAX),Field7]))) 2), 1, )), 2)

public static string Encrypt(string toEncrypt, bool useHashing = true)
    {
        byte[] keyArray;
        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

        System.Configuration.AppSettingsReader settingsReader =
                                            new AppSettingsReader();
        // Get the key from config file

        string key = (string)settingsReader.GetValue("EncryptionKey",
                                                         typeof(String));
        //System.Windows.Forms.MessageBox.Show(key);
        //If hashing use get hashcode regards to your key
        if (useHashing)
        {
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
            //Always release the resources and flush data
            // of the Cryptographic service provide. Best Practice

            hashmd5.Clear();
        }
        else
            keyArray = UTF8Encoding.UTF8.GetBytes(key);

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        //set the secret key for the tripleDES algorithm
        tdes.Key = keyArray;
        //mode of operation. there are other 4 modes.
        //We choose ECB(Electronic code Book)
        tdes.Mode = CipherMode.ECB;
        //padding mode(if any extra byte added)

        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateEncryptor();
        //transform the specified region of bytes array to resultArray
        byte[] resultArray =
          cTransform.TransformFinalBlock(toEncryptArray, 0,
          toEncryptArray.Length);
        //Release resources held by TripleDes Encryptor
        tdes.Clear();
        //Return the encrypted data into unreadable string format
        return Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }

    public static string Decrypt(string cipherString, bool useHashing = true)
    {
        byte[] keyArray;
        //get the byte code of the string

        byte[] toEncryptArray = Convert.FromBase64String(cipherString);

        System.Configuration.AppSettingsReader settingsReader =
                                            new AppSettingsReader();
        //Get your key from config file to open the lock!
        string key = (string)settingsReader.GetValue("EncryptionKey",
                                                     typeof(String));

        if (useHashing)
        {
            //if hashing was used get the hash code with regards to your key
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
            //release any resource held by the MD5CryptoServiceProvider

            hashmd5.Clear();
        }
        else
        {
            //if hashing was not implemented get the byte code of the key
            keyArray = UTF8Encoding.UTF8.GetBytes(key);
        }

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        //set the secret key for the tripleDES algorithm
        tdes.Key = keyArray;
        //mode of operation. there are other 4 modes. 
        //We choose ECB(Electronic code Book)

        tdes.Mode = CipherMode.ECB;
        //padding mode(if any extra byte added)
        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateDecryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(
                             toEncryptArray, 0, toEncryptArray.Length);
        //Release resources held by TripleDes Encryptor                
        tdes.Clear();
        //return the Clear decrypted TEXT
        return UTF8Encoding.UTF8.GetString(resultArray);
    }

login_Model.Password = TableFilter.Encrypt("testingé123ö");

    <add key="EncryptionKey" value="encyptionkeyvalue"/>