如何在C#中实现Triple DES(完整示例)

Question

我想在C#中使用三重DES来加密/解密(utf8)字符串,其中包含任意长度的(utf8)密钥.

我正在寻找这三个功能

public static string Encrypt(string data, string key)
{
    ...
}

public static string Decrypt(string data, string key)
{
    ...
}

public static string GenerateKeyFromString(string str)
{
    ...
}

注意:在任何人链接之前,http://www.geekzilla.co.uk/view7B360BD8-A77C-4F1F-BCA0-ACD0F6795F61.htm实现不起作用,我已对其进行了全面测试.

我已经做了很多搜索,发现了问题EncryptOneBlock和其他问题,但我正在寻找一个完整的'傻瓜'实现,我认为这对其他人也有用.

提前致谢!

Answer 1

完整的来源:http: //www.codeproject.com/Articles/14150/Encrypt-and-Decrypt═-with-C

加密:

public static string Encrypt(string toEncrypt, bool useHashing)
{
    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("SecurityKey", 
                                                     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);
}

解密:

public static string Decrypt(string cipherString, bool useHashing)
{
    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("SecurityKey", 
                                                 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);
}

Answer 2

using System;
using System.Configuration;
using System.Security.Cryptography;
using System.Text;

public class TripleDESImp
{
    public static readonly string Key = ConfigurationManager.AppSettings["Encryption_Key"];
    public static readonly Encoding Encoder = Encoding.UTF8;

    public static string TripleDesEncrypt(string plainText)
    {
        var des = CreateDes(Key);
        var ct = des.CreateEncryptor();
        var input = Encoding.UTF8.GetBytes(plainText);
        var output = ct.TransformFinalBlock(input, 0, input.Length);
        return Convert.ToBase64String(output);
    }

    public static string TripleDesDecrypt(string cypherText)
    {
        var des = CreateDes(Key);
        var ct = des.CreateDecryptor();
        var input = Convert.FromBase64String(cypherText);
        var output = ct.TransformFinalBlock(input, 0, input.Length);
        return Encoding.UTF8.GetString(output);
    }

    public static TripleDES CreateDes(string key)
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        TripleDES des = new TripleDESCryptoServiceProvider();
        var desKey= md5.ComputeHash(Encoding.UTF8.GetBytes(key));
        des.Key = desKey;
        des.IV = new byte[des.BlockSize / 8];
        des.Padding=PaddingMode.PKCS7;
        des.Mode=CipherMode.ECB;
        return des;
    }
}

<configuration>
<appsettings>
<add key="Encryption_Key" value="put_your_encryption_key_here"/>
</appsettings>
<configuration>

Answer 3

为什么不使用 .Net Cryptography Library，它有 DES 和 Triple DES 实现。我建议不要重新发明轮子并使用库，好吧，如果您需要练习和提高您的技能，那么推出自己的实现就更好了！:)

private static void EncryptData(String inName, String outName, byte[] tdesKey, byte[] tdesIV)
{    
//Create the file streams to handle the input and output files.
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
fout.SetLength(0);

//Create variables to help with read and write.
byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
long rdlen = 0;              //This is the total number of bytes written.
long totlen = fin.Length;    //This is the total length of the input file.
int len;                     //This is the number of bytes to be written at a time.

TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();          
CryptoStream encStream = new CryptoStream(fout, tdes.CreateEncryptor(tdesKey, tdesIV), CryptoStreamMode.Write);

Console.WriteLine("Encrypting...");

//Read from the input file, then encrypt and write to the output file.
while(rdlen < totlen)
{
    len = fin.Read(bin, 0, 100);
    encStream.Write(bin, 0, len);
    rdlen = rdlen + len;
    Console.WriteLine("{0} bytes processed", rdlen);
}

encStream.Close();                     
}

来源： MSDN