Des与3Des加密解密-白红宇

Des与3Des加密解密

阅读量：5125 次

发布时间：2019-06-13

本文共 4001 字，大约阅读时间需要 13 分钟。

///     /// Des和3Des算法    /// 
    public class Des    {        ///         /// Des加密        /// 
        /// 明文        /// 密钥        /// 
             public static string DESEnCode(string pToEncrypt, string sKey)        {            pToEncrypt = HttpContext.Current.Server.UrlEncode(pToEncrypt);            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);            MemoryStream ms = new MemoryStream();            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);            cs.Write(inputByteArray, 0, inputByteArray.Length);            cs.FlushFinalBlock();            StringBuilder ret = new StringBuilder();            foreach (byte b in ms.ToArray())            {                ret.AppendFormat("{0:X2}", b);            }            ret.ToString();            return ret.ToString();        }        ///         /// 3Des加密(密钥不能每8位重复，例如：123456781234567812345678，如果这样则算法退化为Des，C#会检测，不能使用)        /// 
        /// 明文        /// 密钥        /// 
             public string Decrypt3DES(string a_strString, string a_strKey)        {            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();            DES.Key = ASCIIEncoding.ASCII.GetBytes(a_strKey);            DES.Mode = CipherMode.ECB;            DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;            ICryptoTransform DESDecrypt = DES.CreateEncryptor();            string result = "";            try            {                byte[] Buffer = Convert.FromBase64String(a_strString);                result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));            }            catch (Exception e)            {            }            return result;        }        ///         /// Des解密        /// 
        /// 密文        /// 密钥        /// 
             public string Decrypt(string encryptedString, string key)        {            byte[] btKey = Encoding.UTF8.GetBytes(key);            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            des.Key = ASCIIEncoding.ASCII.GetBytes(key);            des.Mode = CipherMode.ECB;            des.Padding = System.Security.Cryptography.PaddingMode.PKCS7;            using (MemoryStream ms = new MemoryStream())            {                byte[] inData = Convert.FromBase64String(encryptedString);                try                {                    using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))                    {                        cs.Write(inData, 0, inData.Length);                        cs.FlushFinalBlock();                    }                    return Encoding.UTF8.GetString(ms.ToArray());                }                catch                {                    return encryptedString;                }            }        }        ///         /// 3Des解密(密钥不能每8位重复，例如：123456781234567812345678，如果这样则算法退化为Des，C#会检测，不能使用)        /// 
        /// 密文        /// 密钥        /// 
             public string Decrypt3DES(string a_strString, string a_strKey)        {            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();            DES.Key = ASCIIEncoding.ASCII.GetBytes(a_strKey);            DES.Mode = CipherMode.ECB;            DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;            ICryptoTransform DESDecrypt = DES.CreateDecryptor();            string result = "";            try            {                byte[] Buffer = Convert.FromBase64String(a_strString);                result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));            }            catch (Exception e)            {            }            return result;        }    }