ASP.NET加密解密演算法分享_實用技巧

#region DES加密解密    /// <summary>    /// DES加密    /// </summary>    /// <param name="strSource">待加密字串</param>    /// <param name="key">32位Key值</param>    /// <returns>加密後的字串</returns>    public string DESEncrypt(string strSource)    {      return DESEncrypt(strSource, DESKey);    }    public string DESEncrypt(string strSource, byte[] key)    {      SymmetricAlgorithm sa = Rijndael.Create();      sa.Key = key;      sa.Mode = CipherMode.ECB;      sa.Padding = PaddingMode.Zeros;      MemoryStream ms = new MemoryStream();      CryptoStream cs = new CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write);      byte[] byt = Encoding.Unicode.GetBytes(strSource);      cs.Write(byt, 0, byt.Length);      cs.FlushFinalBlock();      cs.Close();      return Convert.ToBase64String(ms.ToArray());    }    /// <summary>    /// DES解密    /// </summary>    /// <param name="strSource">待解密的字串</param>    /// <param name="key">32位Key值</param>    /// <returns>解密後的字串</returns>    public string DESDecrypt(string strSource)    {      return DESDecrypt(strSource, DESKey);    }    public string DESDecrypt(string strSource, byte[] key)    {      SymmetricAlgorithm sa = Rijndael.Create();      sa.Key = key;      sa.Mode = CipherMode.ECB;      sa.Padding = PaddingMode.Zeros;      ICryptoTransform ct = sa.CreateDecryptor();      byte[] byt = Convert.FromBase64String(strSource);      MemoryStream ms = new MemoryStream(byt);      CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read);      StreamReader sr = new StreamReader(cs, Encoding.Unicode);      return sr.ReadToEnd();    }    #endregion    #region 一個用hash實現的加密解密方法    /// <summary>    /// 加密    /// </summary>    /// <param name="src"></param>    /// <returns></returns>    public static string EncryptStrByHash(string src)    {      if (src.Length == 0)      {        return "";      }      byte[] HaKey = System.Text.Encoding.ASCII.GetBytes((src + "Test").ToCharArray());      byte[] HaData = new byte[20];      HMACSHA1 Hmac = new HMACSHA1(HaKey);      CryptoStream cs = new CryptoStream(Stream.Null, Hmac, CryptoStreamMode.Write);      try      {        cs.Write(HaData, 0, HaData.Length);      }      finally      {        cs.Close();      }      string HaResult = System.Convert.ToBase64String(Hmac.Hash).Substring(0, 16);      byte[] RiKey = System.Text.Encoding.ASCII.GetBytes(HaResult.ToCharArray());      byte[] RiDataBuf = System.Text.Encoding.ASCII.GetBytes(src.ToCharArray());      byte[] EncodedBytes =  { };      MemoryStream ms = new MemoryStream();      RijndaelManaged rv = new RijndaelManaged();      cs = new CryptoStream(ms, rv.CreateEncryptor(RiKey, RiKey), CryptoStreamMode.Write);      try      {        cs.Write(RiDataBuf, 0, RiDataBuf.Length);        cs.FlushFinalBlock();        EncodedBytes = ms.ToArray();      }      finally      {        ms.Close();        cs.Close();      }      return HaResult + System.Convert.ToBase64String(EncodedBytes);    }    /// <summary>    /// 解密    /// </summary>    /// <param name="src"></param>    /// <returns></returns>    public static string DecrypStrByHash(string src)    {      if (src.Length < 40) return "";      byte[] SrcBytes = System.Convert.FromBase64String(src.Substring(16));      byte[] RiKey = System.Text.Encoding.ASCII.GetBytes(src.Substring(0, 16).ToCharArray());      byte[] InitialText = new byte[SrcBytes.Length];      RijndaelManaged rv = new RijndaelManaged();      MemoryStream ms = new MemoryStream(SrcBytes);      CryptoStream cs = new CryptoStream(ms, rv.CreateDecryptor(RiKey, RiKey), CryptoStreamMode.Read);      try      {        cs.Read(InitialText, 0, InitialText.Length);      }      finally      {        ms.Close();        cs.Close();      }      System.Text.StringBuilder Result = new System.Text.StringBuilder();      for (int i = 0; i < InitialText.Length; ++i) if (InitialText[i] > 0) Result.Append((char)InitialText[i]);      return Result.ToString();    }    /// <summary>    /// 對加密後的密文重新編碼,如果密文長>16,則去掉前16個字元,如果長度小於16,返回Null 字元串    /// </summary>    /// <param name="s"></param>    /// <returns></returns>    public string ReEncryptStrByHash(string s)    {      string e = Encrypt.EncryptStrByHash(s);      return ((e.Length > 16) ? e.Substring(16) : "");    }    #endregion    #region Md5加密,產生16位或32位,產生的密文都是大寫    public static string Md5To16(string str)    {      MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();      string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(str)), 4, 8);      t2 = t2.Replace("-", "");      return t2;    }    //// <summary>    /// MD5　32位加密    /// </summary>    /// <param name="str"></param>    /// <returns></returns>    public static string Md5To32(string str)    {      string pwd = "";      MD5 md5 = MD5.Create();      byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(str));      for (int i = 0; i < s.Length; i++)      {        pwd = pwd + s[i].ToString("X");      }      return pwd;    }    #endregion    #region 3DES加密解密    public string Encrypt3DES(string str)    {      //密鑰      string sKey = "wyw308";      //  //向量,可為空白      string sIV = "scf521";      //  //構造對稱演算法      SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();      ICryptoTransform ct;      MemoryStream ms;      CryptoStream cs;      byte[] byt;      mCSP.Key = Convert.FromBase64String(sKey);      mCSP.IV = Convert.FromBase64String(sIV);      mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;      mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;      ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);      byt = Encoding.UTF8.GetBytes(str);      ms = new MemoryStream();      cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);      cs.Write(byt, 0, byt.Length);      cs.FlushFinalBlock();      cs.Close();      return Convert.ToBase64String(ms.ToArray());    }    /// <summary>    /// 帶指定密鑰和向量的3DES加密    /// </summary>    /// <param name="str"></param>    /// <param name="sKey"></param>    /// <param name="sIV"></param>    /// <returns></returns>    public string Encrypt3DES(string str, string sKey, string sIV)    {      SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();      ICryptoTransform ct;      MemoryStream ms;      CryptoStream cs;      byte[] byt;      mCSP.Key = Convert.FromBase64String(sKey);      mCSP.IV = Convert.FromBase64String(sIV);      mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;      mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;      ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);      byt = Encoding.UTF8.GetBytes(str);      ms = new MemoryStream();      cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);      cs.Write(byt, 0, byt.Length);      cs.FlushFinalBlock();      cs.Close();      return Convert.ToBase64String(ms.ToArray());    }    //解密    public string Decrypt3DES(string Value)    {      string sKey = "wyw308";      string sIV = "scf521";      SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();      ICryptoTransform ct;      MemoryStream ms;      CryptoStream cs;      byte[] byt;      mCSP.Key = Convert.FromBase64String(sKey);      mCSP.IV = Convert.FromBase64String(sIV);      mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;      mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;      ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);      byt = Convert.FromBase64String(Value);      ms = new MemoryStream();      cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);      cs.Write(byt, 0, byt.Length);      cs.FlushFinalBlock();      cs.Close();      return Encoding.UTF8.GetString(ms.ToArray());    }    /// <summary>    /// 帶指定密鑰和向量的3DES解密    /// </summary>    /// <param name="Value"></param>    /// <param name="sKey"></param>    /// <param name="sIV"></param>    /// <returns></returns>    public string Decrypt3DES(string str, string sKey, string sIV)    {      SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();      ICryptoTransform ct;      MemoryStream ms;      CryptoStream cs;      byte[] byt;      mCSP.Key = Convert.FromBase64String(sKey);      mCSP.IV = Convert.FromBase64String(sIV);      mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;      mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;      ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);      byt = Convert.FromBase64String(str);      ms = new MemoryStream();      cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);      cs.Write(byt, 0, byt.Length);      cs.FlushFinalBlock();      cs.Close();      return Encoding.UTF8.GetString(ms.ToArray());    }    #endregion    #region 一個簡單的加密解密方法,只支援英文    public static string EnCryptEnStr(string str) //倒序加1加密    {      byte[] by = new byte[str.Length];      for (int i = 0;       i <= str.Length - 1;       i++)      {        by[i] = (byte)((byte)str[i] + 1);      }      str = "";      for (int i = by.Length - 1;       i >= 0;       i--)      {        str += ((char)by[i]).ToString();      }      return str;    }    public static string DeCryptEnStr(string str) //順序減1解碼    {      byte[] by = new byte[str.Length];      for (int i = 0;       i <= str.Length - 1;       i++)      {        by[i] = (byte)((byte)str[i] - 1);      }      str = "";      for (int i = by.Length - 1;       i >= 0;       i--)      {        str += ((char)by[i]).ToString();      }      return str;    }    #endregion    #region 一個簡單的加密解密方法,在上一個的基礎上支援中文    public static string EnCryptCnStr(string str)    {      string htext = ""; // blank text      for (int i = 0; i < str.Length; i++)      {        htext = htext + (char)(str[i] + 10 - 1 * 2);      }      return htext;    }    public static string DeCryptCnStr(string str)    {      string dtext = "";      for (int i = 0; i < str.Length; i++)      {        dtext = dtext + (char)(str[i] - 10 + 1 * 2);      }      return dtext;    }    #endregion    #region Url地址編碼解碼    /// <summary>    /// 編碼Url地址    /// </summary>    /// <param name="url"></param>    /// <returns></returns>    public static string UrlEncode(string url)    {      byte[] mByte = null;      mByte = System.Text.Encoding.GetEncoding("GB2312").GetBytes(url);      return System.Web.HttpUtility.UrlEncode(mByte);    }    /// <summary>    /// 解碼Url地址    /// </summary>    /// <param name="url"></param>    /// <returns></returns>    public static string UrlDecode(string url)    {      return HttpUtility.UrlDecode(url, System.Text.Encoding.GetEncoding("GB2312"));    }    #endregion

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