如何在C＃中实现Triple DES（完整示例）

我想在C＃中使用三重DES来加密/解密带有任意长度（utf8）密钥的（utf8）字符串。

我正在寻找这三个function

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

注意：在有人链接之前， 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，发现了像EncryptOneBlock和其他问题的一些问题，但我正在寻找一个完整的’for dummies’实现，我认为这对其他人也有用。

提前致谢！

Answer 1

完整来源： http ： //www.codeproject.com/Articles/14150/Encrypt-and-DecryptIGH-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

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图书馆，如果你需要练习和提高你的技能，而不是推出你自己的实施！ 🙂

 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(); } 

资料来源： MSDN

Answer 3

这是一个完整的示例复制粘贴准备好..

 using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Web; namespace MVC3JavaScript_3_2012.Utilities { public class MyTripleDES { private readonly TripleDESCryptoServiceProvider _des = new TripleDESCryptoServiceProvider(); private readonly UTF8Encoding _utf8 = new UTF8Encoding(); /// 
 /// Key to use during encryption and decryption /// 
 private byte[] _keyValue; public byte[] Key { get { return _keyValue; } private set { _keyValue = value; } } /// 
 /// Initialization vector to use during encryption and decryption /// 
 private byte[] _ivValue; public byte[] IV { get { return _ivValue; } private set { _ivValue = value; } } /// 
 /// Constructor, allows the key and initialization vector to be provided as strings /// 
 ///  ///  public MyTripleDES(string key, string iv) { _keyValue = Convert.FromBase64String(key); _ivValue = Convert.FromBase64String(iv); } /// 
 /// Decrypt Bytes /// 
 ///  ///  public byte[] Decrypt(byte[] bytes) { return Transform(bytes, _des.CreateDecryptor(_keyValue, _ivValue)); } /// 
 /// Encrypt Bytes /// 
 ///  ///  public byte[] Encrypt(byte[] bytes) { return Transform(bytes, _des.CreateEncryptor(_keyValue, _ivValue)); } /// 
 /// Decrypt a string /// 
 ///  ///  public string Decrypt(string text) { byte[] input = HttpServerUtility.UrlTokenDecode(text); byte[] output = Transform(input, _des.CreateDecryptor(_keyValue, _ivValue)); return _utf8.GetString(output); } /// 
 /// Encrypt a string and return Base64String /// 
 ///  ///  public string Encrypt(string text) { byte[] input = _utf8.GetBytes(text); byte[] output = Transform(input, _des.CreateEncryptor(_keyValue, _ivValue)); return HttpServerUtility.UrlTokenEncode(output); } /// 
 /// Encrypt or Decrypt bytes. /// 
 private byte[] Transform(byte[] input, ICryptoTransform cryptoTransform) { // Create the necessary streams using (var memory = new MemoryStream()) { using (var stream = new CryptoStream(memory, cryptoTransform, CryptoStreamMode.Write)) { // Transform the bytes as requested stream.Write(input, 0, input.Length); stream.FlushFinalBlock(); // Read the memory stream and convert it back into byte array memory.Position = 0; var result = new byte[memory.Length]; memory.Read(result, 0, result.Length); // Return result return result; } } } public static string CreateNewVector() { using (var des = new System.Security.Cryptography.TripleDESCryptoServiceProvider()) { des.GenerateIV(); return Convert.ToBase64String(des.IV); } } public static string CreateNewKey() { using (var des = new System.Security.Cryptography.TripleDESCryptoServiceProvider()) { des.GenerateKey(); return Convert.ToBase64String(des.Key); } } } } 

Answer 4

 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; } }