public sealed class EncryptUtils{#region Base64加密解密/// <summary>/// Base64加密/// </summary>/// <param name="input">需要加密的字符串</param>/// <returns></returns>public static string Base64Encrypt(string input){return Base64Encrypt(input, new UTF8Encoding());}/// <summary>/// Base64加密/// </summary>/// <param name="input">需要加密的字符串</param>/// <param name="encode">字符编码</param>/// <returns></returns>public static string Base64Encrypt(string input, Encoding encode){return Convert.ToBase64String(encode.GetBytes(input));}/// <summary>/// Base64解密/// </summary>/// <param name="input">需要解密的字符串</param>/// <returns></returns>public static string Base64Decrypt(string input){return Base64Decrypt(input, new UTF8Encoding());}/// <summary>/// Base64解密/// </summary>/// <param name="input">需要解密的字符串</param>/// <param name="encode">字符的编码</param>/// <returns></returns>public static string Base64Decrypt(string input, Encoding encode){return encode.GetString(Convert.FromBase64String(input));}#endregion#region DES加密解密/// <summary>/// DES加密/// </summary>/// <param name="data">加密数据</param>/// <param name="key">8位字符的密钥字符串</param>/// <param name="iv">8位字符的初始化向量字符串</param>/// <returns></returns>public static string DESEncrypt(string data, string key, string iv){byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(key);byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(iv);DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();int i = cryptoProvider.KeySize;MemoryStream ms = new MemoryStream();CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);StreamWriter sw = new StreamWriter(cst);sw.Write(data);sw.Flush();cst.FlushFinalBlock();sw.Flush();return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);}/// <summary>/// DES解密/// </summary>/// <param name="data">解密数据</param>/// <param name="key">8位字符的密钥字符串(需要和加密时相同)</param>/// <param name="iv">8位字符的初始化向量字符串(需要和加密时相同)</param>/// <returns></returns>public static string DESDecrypt(string data, string key, string iv){byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(key);byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(iv);byte[] byEnc;try{byEnc = Convert.FromBase64String(data);}catch{return null;}DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();MemoryStream ms = new MemoryStream(byEnc);CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);StreamReader sr = new StreamReader(cst);return sr.ReadToEnd();}#endregion#region MD5加密/// <summary>/// MD5加密/// </summary>/// <param name="input">需要加密的字符串</param>/// <returns></returns>public static string MD5Encrypt(string input){return MD5Encrypt(input, new UTF8Encoding());}/// <summary>/// MD5加密/// </summary>/// <param name="input">需要加密的字符串</param>/// <param name="encode">字符的编码</param>/// <returns></returns>public static string MD5Encrypt(string input, Encoding encode){MD5 md5 = new MD5CryptoServiceProvider();byte[] t = md5.ComputeHash(encode.GetBytes(input));StringBuilder sb = new StringBuilder(32);for (int i = 0; i < t.Length; i++)sb.Append(t[i].ToString("x").PadLeft(2, '0'));return sb.ToString();}/// <summary>/// MD5对文件流加密/// </summary>/// <param name="sr"></param>/// <returns></returns>public static string MD5Encrypt(Stream stream){MD5 md5serv = MD5CryptoServiceProvider.Create();byte[] buffer = md5serv.ComputeHash(stream);StringBuilder sb = new StringBuilder();foreach (byte var in buffer)sb.Append(var.ToString("x2"));return sb.ToString();}/// <summary>/// MD5加密(返回16位加密串)/// </summary>/// <param name="input"></param>/// <param name="encode"></param>/// <returns></returns>public static string MD5Encrypt16(string input, Encoding encode){MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();string result = BitConverter.ToString(md5.ComputeHash(encode.GetBytes(input)), 4, 8);result = result.Replace("-", "");return result;}#endregion#region 3DES 加密解密public static string DES3Encrypt(string data, string key){TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();DES.Key = ASCIIEncoding.ASCII.GetBytes(key);DES.Mode = CipherMode.CBC;DES.Padding = PaddingMode.PKCS7;ICryptoTransform DESEncrypt = DES.CreateEncryptor();byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(data);return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));}public static string DES3Decrypt(string data, string key){TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();DES.Key = ASCIIEncoding.ASCII.GetBytes(key);DES.Mode = CipherMode.CBC;DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;ICryptoTransform DESDecrypt = DES.CreateDecryptor();string result = "";try{byte[] Buffer = Convert.FromBase64String(data);result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));}catch (Exception e){}return result;}#endregion}