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  • DES加密解密方法


    using System;
    using System.Security.Cryptography;
    using System.Text;

    namespace Task.Code
    {
    /// <summary>
    /// DES加密、解密帮助类
    /// </summary>
    public class DESEncrypt
    {
    private static string DESKey = "task_desencrypt_2016";

    #region ========加密========
    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="Text"></param>
    /// <returns></returns>
    public static string Encrypt(string Text)
    {
    return Encrypt(Text, DESKey);
    }
    /// <summary>
    /// 加密数据
    /// </summary>
    /// <param name="Text"></param>
    /// <param name="sKey"></param>
    /// <returns></returns>
    public static string Encrypt(string Text, string sKey)
    {
    DESCryptoServiceProvider des = new DESCryptoServiceProvider();
    byte[] inputByteArray;
    inputByteArray = Encoding.Default.GetBytes(Text);
    des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    System.IO.MemoryStream ms = new System.IO.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);
    }
    return ret.ToString();
    }

    #endregion

    #region ========解密========
    /// <summary>
    /// 解密
    /// </summary>
    /// <param name="Text"></param>
    /// <returns></returns>
    public static string Decrypt(string Text)
    {
    if (!string.IsNullOrEmpty(Text))
    {
    return Decrypt(Text, DESKey);
    }
    else
    {
    return "";
    }
    }
    /// <summary>
    /// 解密数据
    /// </summary>
    /// <param name="Text"></param>
    /// <param name="sKey"></param>
    /// <returns></returns>
    public static string Decrypt(string Text, string sKey)
    {
    DESCryptoServiceProvider des = new DESCryptoServiceProvider();
    int len;
    len = Text.Length / 2;
    byte[] inputByteArray = new byte[len];
    int x, i;
    for (x = 0; x < len; x++)
    {
    i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
    inputByteArray[x] = (byte)i;
    }
    des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
    System.IO.MemoryStream ms = new System.IO.MemoryStream();
    CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
    cs.Write(inputByteArray, 0, inputByteArray.Length);
    cs.FlushFinalBlock();
    return Encoding.Default.GetString(ms.ToArray());
    }

    #endregion
    }
    }

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  • 原文地址:https://www.cnblogs.com/SDdemon/p/7686941.html
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