C#加密和解密字符串

public class Encrypt{//默认密钥向量private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; /// <summary>/// DES加密字符串/// </summary>/// <param name="encryptString">待加密的字符串</param>/// <param name="encryptKey">加密密钥,要求为8位</param>/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>public static string EncryptDES(string encryptString, string encryptKey){try{byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));byte[] rgbIV = Keys;byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();MemoryStream mStream = new MemoryStream();CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();return Convert.ToBase64String(mStream.ToArray());}catch{return encryptString;}}/// <summary>/// DES解密字符串/// </summary>/// <param name="decryptString">待解密的字符串</param>/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>/// <returns>解密成功返回解密后的字符串，失败返源串</returns>public static string DecryptDES(string decryptString, string decryptKey){try{byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);byte[] rgbIV = Keys;byte[] inputByteArray = Convert.FromBase64String(decryptString);DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();MemoryStream mStream = new MemoryStream();CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();return Encoding.UTF8.GetString(mStream.ToArray());}catch{return decryptString;}}}