解密不起作用C# [英] decryption not working c#

问题描述

我的文件具有加密格式.我想解密我的文件.我已经尝试过这种方法，但这不起作用.

 受保护的 无效 Button2_Click1(对象发​​件人，EventArgs e)
       {
           DecryptFile( @" ，  d:\ sql \ eula.3082.txt"，GenerateKey());
       }

静态 无效 DecryptFile(字符串 sInputFilename，
                    字符串 sOutputFilename，
                    字符串 sKey)
        {
            DESCryptoServiceProvider DES = 新 DESCryptoServiceProvider();
            // 此提供程序需要64位密钥和IV.
            // 设置用于DES算法的密钥.
            DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            // 设置初始化向量.
            DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

            // 创建文件流以将加密后的文件读回.
            FileStream fsread = 新 FileStream(sInputFilename，
                                           FileMode.Open，
                                           FileAccess.Read);
            // 从DES实例创建DES解密器.
            ICryptoTransform desdecrypt = DES.CreateDecryptor();
            // 创建用于读取并执行的密码流集
            // 对传入字节的DES解密转换.
            CryptoStream cryptostreamDecr = 新 CryptoStream(fsread，
                                                         解密，
                                                         CryptoStreamMode.Read);
            // 打印解密文件的内容.
            StreamWriter fsDecrypted = 新 StreamWriter(sOutputFilename);
            fsDecrypted.Write(新 StreamReader(cryptostreamDecr).ReadToEnd());
            fsDecrypted.Flush();
            fsDecrypted.Close();
        } 

在这一行中，我遇到了错误:数据错误

fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());

解决方案

请确保加密和解密的密钥相同.

我认为您的问题可能是关键:

GenerateKey()

如果生成随机密钥，则将获得异常，因为需要使用与加密相同的密钥来解密文件.
除非您创建的应用程序应该使用字典或强力攻击来破解密钥，但是即使算法的密钥很长，算法也不是最强的算法，但这将需要一段时间.

我们还可以看到crypto命令，您是否已加密文件.确保您使用的算法和加密算法完全相同.

这是一篇精彩的文章，可帮助您开始进行加密和解密.

使用C#简单加密和解密数据 [ ^ ]

以下是一些可能对您有帮助的链接.
使用TripleDESCryptoServiceProvider类在.NET中进行加密/解密的功能

尝试一下

Encryption-Decryption-asp .net

这也是

希望对您有所帮助.

I have my file woth encrypted format.i want to decrypt my file.i have tried like this but this is not working.

protected void Button2_Click1(object sender, EventArgs e)
       {
           DecryptFile(@"d:\eula.3082.txt", @"d:\sql\eula.3082.txt", GenerateKey());
       }

static void DecryptFile(string sInputFilename,
                    string sOutputFilename,
                    string sKey)
        {
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            //A 64 bit key and IV is required for this provider.
            //Set secret key For DES algorithm.
            DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            //Set initialization vector.
            DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

            //Create a file stream to read the encrypted file back.
            FileStream fsread = new FileStream(sInputFilename,
                                           FileMode.Open,
                                           FileAccess.Read);
            //Create a DES decryptor from the DES instance.
            ICryptoTransform desdecrypt = DES.CreateDecryptor();
            //Create crypto stream set to read and do a 
            //DES decryption transform on incoming bytes.
            CryptoStream cryptostreamDecr = new CryptoStream(fsread,
                                                         desdecrypt,
                                                         CryptoStreamMode.Read);
            //Print the contents of the decrypted file.
            StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
            fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
            fsDecrypted.Flush();
            fsDecrypted.Close();
        }

In this line i am getting error: Bad data

fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());

解决方案

Make sure the key is the same for encryption and decryption.

I think your problem may be the key :

GenerateKey()

If you are generating a random key you will get an exception becuase a file needs to be decrtypted with the same key it was encrypted.
unless you are creating an application that is supposed to hack the key using a dictionary or brite force attack , but even though the algorithm isnt the strongest if they key is long that will take a while.

Also can we see the encrypt command , did you encrypt the file . Make sure you are using the exact same algorithm and encoding that encrypted it.

Heres a brilliant article to get you started on encryption and decryption.

Simple encrypting and decrypting data in C#[^]

Hi,
Here are a few links which might help you.
Encryption/Decryption Function in .NET using the TripleDESCryptoServiceProvider Class

Try this

Encryption-Decryption-in-asp.net

And this too

Hope this helps..

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