DES加密解密帮助类
public class DESCrypto { /// <summary> /// 初始化des实例秘钥及向量 /// </summary> /// <param name="key"></param> /// <returns></returns> private static DESCryptoServiceProvider InitDESInstance(string key) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] salt = new byte[] { 0x0A, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0xF1 }; byte[] keyByte = Encoding.UTF8.GetBytes(key); Rfc2898DeriveBytes rfcKey = new Rfc2898DeriveBytes(keyByte, salt, 8); Rfc2898DeriveBytes rfcIv = new Rfc2898DeriveBytes("0987654321", salt, 8); des.Key = rfcKey.GetBytes(8); des.IV = rfcIv.GetBytes(8); return des; } #region 基于Base64的加密解密（不其他格式的加解密方法配合使用） /// <summary> /// 基于Base64 /// </summary> /// <param name="plaintext"></param> /// <param name="key"></param> /// <returns></returns> public static string DESEncryptBase64(string plaintext,string key) { DESCryptoServiceProvider des = InitDESInstance(key); byte[] dataByteArray = Encoding.UTF8.GetBytes(plaintext); string ciphertext = ""; using (MemoryStream ms = new MemoryStream()) using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(dataByteArray, 0, dataByteArray.Length); cs.FlushFinalBlock(); ciphertext = Convert.ToBase64String(ms.ToArray()); } return ciphertext; } /// <summary> /// 基于Base64 /// </summary> /// <param name="encrypt"></param> /// <param name="key"></param> /// <returns></returns> public static string DESDecryptBase64(string encrypt, string key) { DESCryptoServiceProvider des = InitDESInstance(key); byte[] dataByteArray = Convert.FromBase64String(encrypt); using (MemoryStream ms = new MemoryStream()) using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)) { cs.Write(dataByteArray, 0, dataByteArray.Length); cs.FlushFinalBlock(); return Encoding.UTF8.GetString(ms.ToArray()); } } #endregion #region 基于2位十六进制格式的加密解密（不其他格式的加解密方法配合使用） /// <summary> /// 加密 /// </summary> /// <param name="plaintext">明文</param> /// <param name="key"></param> /// <returns></returns> public static string DESEncrypt(string plaintext, string key) { DESCryptoServiceProvider des = InitDESInstance(key); StringBuilder sb = new StringBuilder(); byte[] dataByteArray = Encoding.UTF8.GetBytes(plaintext); string ciphertext = ""; using (MemoryStream ms = new MemoryStream()) using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(dataByteArray, 0, dataByteArray.Length); cs.FlushFinalBlock(); //输出加密文本 foreach (byte b in ms.ToArray()) { sb.AppendFormat("{0:X2}", b); } ciphertext = sb.ToString(); } return ciphertext; } /// <summary> /// 解密 /// </summary> /// <param name="ciphertext">密文</param> /// <param name="key"></param> /// <returns></returns> public static string DESDecrypt(string ciphertext, string key) { DESCryptoServiceProvider des = InitDESInstance(key); byte[] dataByteArray = new byte[ciphertext.Length / 2]; for (int x = 0; x < ciphertext.Length / 2; x++) { int i = (Convert.ToInt32(ciphertext.Substring(x * 2, 2), 16)); dataByteArray[x] = (byte)i; } using (MemoryStream ms = new MemoryStream()) using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)) { cs.Write(dataByteArray, 0, dataByteArray.Length); cs.FlushFinalBlock(); return Encoding.UTF8.GetString(ms.ToArray()); } } #endregion #region 文件加密解密（不其他格式的加解密方法配合使用） /// <summary> /// 加密文件 /// </summary> /// <param name="sourceFile">文件的物理路径</param> /// <param name="encryptFile">文件的物理路径</param> /// <param name="key"></param> public static void DESEncryptFile(string sourceFile, string encryptFile, string key) { if (string.IsNullOrEmpty(sourceFile) || string.IsNullOrEmpty(encryptFile)||!File.Exists(sourceFile)) return; DESCryptoServiceProvider des = InitDESInstance(key); using (FileStream sourceStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read)) using (FileStream encryptStream = new FileStream(encryptFile, FileMode.Create, FileAccess.Write)) { byte[] dataByteArray = new byte[sourceStream.Length]; sourceStream.Read(dataByteArray, 0, dataByteArray.Length); using (CryptoStream cs = new CryptoStream(encryptStream, des.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(dataByteArray, 0, dataByteArray.Length); cs.FlushFinalBlock(); } } } /// <summary> /// 解密文件 /// </summary> /// <param name="encryptFile">文件的物理路径</param> /// <param name="decryptFile">文件的物理路径</param> /// <param name="key"></param> public static void DESDecryptFile(string encryptFile, string decryptFile, string key) { if (string.IsNullOrEmpty(encryptFile) || string.IsNullOrEmpty(decryptFile) || !File.Exists(encryptFile))return; DESCryptoServiceProvider des = InitDESInstance(key); using (FileStream encryptStream = new FileStream(encryptFile, FileMode.Open, FileAccess.Read)) using (FileStream decryptStream = new FileStream(decryptFile, FileMode.Create, FileAccess.Write)) { byte[] dataByteArray = new byte[encryptStream.Length]; encryptStream.Read(dataByteArray, 0, dataByteArray.Length); using (CryptoStream cs = new CryptoStream(decryptStream, des.CreateDecryptor(), CryptoStreamMode.Write)) { cs.Write(dataByteArray, 0, dataByteArray.Length); cs.FlushFinalBlock(); } } } /// <summary> /// 加密文本并输出到文件 /// </summary> /// <param name="plaintext"></param> /// <param name="FileName">文件的物理路径</param> /// <param name="Key"></param> public static void DESEncryptTextToFile(string plaintext, string FileName, string key) { if (string.IsNullOrEmpty(FileName)) return; DESCryptoServiceProvider des = InitDESInstance(key); byte[] dataByteArray = Encoding.UTF8.GetBytes(plaintext); using (FileStream fStream = File.Open(FileName, FileMode.Create)) using (CryptoStream cStream = new CryptoStream(fStream, des.CreateEncryptor(), CryptoStreamMode.Write)) { cStream.Write(dataByteArray, 0, dataByteArray.Length); cStream.FlushFinalBlock(); } } /// <summary> /// 解密文件中的密文并返回 /// </summary> /// <param name="FileName"></param> /// <param name="Key"></param> /// <returns></returns> public static string DESDecryptTextFromFile(string FileName, string key) { if (string.IsNullOrEmpty(FileName)||!File.Exists(FileName)) return ""; DESCryptoServiceProvider des = InitDESInstance(key); using (FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate)) using (CryptoStream cStream = new CryptoStream(fStream, des.CreateDecryptor(), CryptoStreamMode.Read)) using (StreamReader sReader = new StreamReader(cStream)) { string val = sReader.ReadToEnd(); return val; } } #endregion }
Tips：参考MSDN整理编写，比较全面。