【转】c#中DES加密解密的类

using System; using System.Collections.Generic; using System.Text; using System.Security.Cryptography; using System.Globalization; using System.IO; namespace what { class DES { // 创建Key public string GenerateKey() { DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider) DESCryptoServiceProvider.Create(); return ASCIIEncoding.ASCII.GetString(desCrypto.Key); } // 加密字符串 public string EncryptString(string sInputString, string sKey) { byte[] data = Encoding.UTF8.GetBytes(sInputString); DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey); DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey); ICryptoTransform desencrypt = DES.CreateEncryptor(); byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length); return BitConverter.ToString(result); } // 解密字符串 public string DecryptString(string sInputString, string sKey) { string[] sInput = sInputString.Split("-".ToCharArray()); byte[] data = new byte[sInput.Length]; for (int i = 0; i < sInput.Length; i++) { data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber); } DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey); DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey); ICryptoTransform desencrypt = DES.CreateDecryptor(); byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length); return Encoding.UTF8.GetString(result); } } }

来自：http://hi.baidu.com/gis_chuck/blog/item/5e8b1c180ec1a94c43a9ad8b.html