C#_加密解密

標籤：

一、MD5加密解密

 

1、加密

public static string ToMd5(string clearString)

{            Byte[] clearBytes = System.Text.Encoding.Unicode.GetBytes(clearString);            string hashedPwd = BitConverter.ToString(((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(clearBytes));            return hashedPwd;        }

2、32位MD5加密

        public static string GetMd5Base32(string sInput)

        {            System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();            System.Security.Cryptography.MD5 md5;            byte[] bytesSrc;            byte[] result;            StringBuilder sb = new StringBuilder();            bytesSrc = encoding.GetBytes(sInput);            md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();            result = md5.ComputeHash(bytesSrc);            for (int i = 0; i < result.Length; i++)            {                sb.AppendFormat("{0:x2}", result[i]);            }            return sb.ToString();        }

二、base64演算法加密解密

    /// <summary>    /// 有關base64編碼演算法的相關操作    /// </summary>    public class Base64    {        public Base64()        {        }         /// <summary>        /// 將字串使用base64演算法加密        /// </summary>        /// <param name="sourceString">待加密的字串</param>        /// <param name="ens">System.Text.Encoding 對象，如建立中文編碼集對象：System.Text.Encoding.GetEncoding(54936)</param>        /// <returns>加碼後的文本字串</returns>        public static string EncodingForString(string sourceString, System.Text.Encoding ens)        {            return Convert.ToBase64String(ens.GetBytes(sourceString));        }

/// <summary>        /// 將字串使用base64演算法加密        /// </summary>        /// <param name="sourceString">待加密的字串</param>        /// <returns>加碼後的文本字串</returns>        public static string EncodingForString(string sourceString)        {            return EncodingForString(sourceString, System.Text.Encoding.GetEncoding(54936));        }        /// <summary>        /// 從base64編碼的字串中還原字串，支援中文        /// </summary>        /// <param name="base64String">base64加密後的字串</param>        /// <param name="ens">System.Text.Encoding 對象，如建立中文編碼集對象：System.Text.Encoding.GetEncoding(54936)</param>        /// <returns>還原後的文本字串</returns>        public static string DecodingForString(string base64String, System.Text.Encoding ens)        {            /**            * ***********************************************************            *             * 從base64String中取得的位元組值為字元的機內碼（ansi字元編碼）            * 一般的，用機內碼轉換為漢字是公式：            * (char)(第一位元組的二進位值*256+第二位元組值)            * 而在c#中的char或string由於採用了unicode編碼，就不能按照上面的公式計算了            * ansi的位元組編和unicode編碼不相容            * 故利用.net類庫提供的編碼類別實現從ansi編碼到unicode代碼的轉換            *             * GetEncoding 方法依賴於基礎平台支援大部分字碼頁。但是，對於下列情況提供系統支援：預設編碼，即在執行此方法的電腦的地區設定中指定的編碼；Little- Endian Unicode (UTF-16LE)；Big-Endian Unicode (UTF-16BE)；Windows 作業系統 (windows-1252)；UTF-7；UTF-8；ASCII 以及 GB18030（簡體中文）。            *            *指定下表 中列出的其中一個名稱以擷取具有對應字碼頁的系統支援的編碼。            *            * 字碼頁 名稱             * 1200 “UTF-16LE”、“utf-16”、“ucs-2”、“unicode”或“ISO-10646-UCS-2”             * 1201 “UTF-16BE”或“unicodeFFFE”             * 1252 “windows-1252”             * 65000 “utf-7”、“csUnicode11UTF7”、“unicode-1-1-utf-7”、“unicode-2-0-utf-7”、“x- unicode-1-1-utf-7”或“x-unicode-2-0-utf-7”             * 65001 “utf-8”、“unicode-1-1-utf-8”、“unicode-2-0-utf-8”、“x-unicode-1-1-utf-8”或 “x-unicode-2-0-utf-8”             * 20127 “us-ascii”、“us”、“ascii”、“ANSI_X3.4-1968”、“ANSI_X3.4-1986”、“cp367”、 “csASCII”、“IBM367”、“iso-ir-6”、“ISO646-US”或“ISO_646.irv:1991”             * 54936 “GB18030”             *            * 某些平台可能不支援特定的字碼頁。例如，Windows 98 的美國版本可能不支援日語 Shift-jis 字碼頁（字碼頁 932）。這種情況下，GetEncoding 方法將在執行下面的 C# 代碼時引發 NotSupportedException：            *            * Encoding enc = Encoding.GetEncoding("shift-jis");             **************************************************************/            // 從base64String中得到原始字元            return ens.GetString(Convert.FromBase64String(base64String));        }        /// <summary>        /// 從base64編碼的字串中還原字串，支援中文        /// </summary>        /// <param name="base64String">base64加密後的字串</param>        /// <returns>還原後的文本字串</returns>        public static string DecodingForString(string base64String)        {            return DecodingForString(base64String, System.Text.Encoding.GetEncoding(54936));        }        //--------------------------------------------------------------------------------------        /// <summary>        /// 對任意類型的檔案進行base64加碼        /// </summary>        /// <param name="fileName">檔案的路徑和檔案名稱</param>        /// <returns>對檔案進行base64編碼後的字串</returns>        public static string EncodingForFile(string fileName)        {            System.IO.FileStream fs = System.IO.File.OpenRead(fileName);            System.IO.BinaryReader br = new System.IO.BinaryReader(fs);            /*System.Byte[] b=new System.Byte[fs.Length];        fs.Read(b,0,Convert.ToInt32(fs.Length));*/            string base64String = Convert.ToBase64String(br.ReadBytes((int)fs.Length));            br.Close();            fs.Close();            return base64String;        }        /// <summary>        /// 把經過base64編碼的字串儲存為檔案        /// </summary>        /// <param name="base64String">經base64加碼後的字串</param>        /// <param name="fileName">儲存檔案的路徑和檔案名稱</param>        /// <returns>儲存檔案是否成功</returns>        public static bool SaveDecodingToFile(string base64String, string fileName)        {            System.IO.FileStream fs = new System.IO.FileStream(fileName, System.IO.FileMode.Create);            System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs);            bw.Write(Convert.FromBase64String(base64String));            bw.Close();            fs.Close();            return true;        }        //-------------------------------------------------------------------------------        /// <summary>        /// 從網路地址一取得檔案並轉化為base64編碼        /// </summary>        /// <param name="url">檔案的url地址,一個絕對的url地址</param>        /// <param name="objWebClient">System.Net.WebClient 對象</param>        /// <returns></returns>        public static string EncodingFileFromUrl(string url, System.Net.WebClient objWebClient)        {            return Convert.ToBase64String(objWebClient.DownloadData(url));        }        /// <summary>        /// 從網路地址一取得檔案並轉化為base64編碼        /// </summary>        /// <param name="url">檔案的url地址,一個絕對的url地址</param>        /// <returns>將檔案轉化後的base64字串</returns>        public static string EncodingFileFromUrl(string url)        {            //System.Net.WebClient myWebClient = new System.Net.WebClient();            return EncodingFileFromUrl(url, new System.Net.WebClient());        }    }

三、SHA1加密

private string getSHA(string code) 

{   if (!String.IsNullOrEmpty(code))   {      return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(code, "SHA1").ToLower();   }   else    {      return string.Empty;   }   }

四、AES加密解密

/// <summary>    /// AES加密解密    /// </summary>    public class AES    {        /// <summary>        /// 擷取密鑰        /// </summary>        private static string Key        {            get { return @")O[NB]6,YF}+efcaj{+oESb9d8>Z‘e9M"; }        }        /// <summary>        /// 擷取向量        /// </summary>        private static string IV        {            get { return @"L+/~f4,Ir)b$=pkf"; }        }        /// <summary>        /// AES加密        /// </summary>        /// <param name="plainStr">明文字串</param>        /// <returns>密文</returns>        public static string AESEncrypt(string plainStr)        {            byte[] bKey = Encoding.UTF8.GetBytes(Key);            byte[] bIV = Encoding.UTF8.GetBytes(IV);            byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);            string encrypt = null;            Rijndael aes = Rijndael.Create();            try            {                using (MemoryStream mStream = new MemoryStream())                {                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))                    {                        cStream.Write(byteArray, 0, byteArray.Length);                        cStream.FlushFinalBlock();                        encrypt = Convert.ToBase64String(mStream.ToArray());                    }                }            }            catch { }            aes.Clear();            return encrypt;        }        /// <summary>        /// AES加密        /// </summary>        /// <param name="plainStr">明文字串</param>        /// <param name="returnNull">加密失敗時是否返回 null，false 返回 String.Empty</param>        /// <returns>密文</returns>        public static string AESEncrypt(string plainStr, bool returnNull)        {            string encrypt = AESEncrypt(plainStr);            return returnNull ? encrypt : (encrypt == null ? String.Empty : encrypt);        }        /// <summary>        /// AES解密        /// </summary>        /// <param name="encryptStr">密文字串</param>        /// <returns>明文</returns>        public static string AESDecrypt(string encryptStr)        {            byte[] bKey = Encoding.UTF8.GetBytes(Key);            byte[] bIV = Encoding.UTF8.GetBytes(IV);            byte[] byteArray = Convert.FromBase64String(encryptStr);            string decrypt = null;            Rijndael aes = Rijndael.Create();            try            {                using (MemoryStream mStream = new MemoryStream())                {                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write))                    {                        cStream.Write(byteArray, 0, byteArray.Length);                        cStream.FlushFinalBlock();                        decrypt = Encoding.UTF8.GetString(mStream.ToArray());                    }                }            }            catch { }            aes.Clear();            return decrypt;        }        /// <summary>        /// AES解密        /// </summary>        /// <param name="encryptStr">密文字串</param>        /// <param name="returnNull">解密失敗時是否返回 null，false 返回 String.Empty</param>        /// <returns>明文</returns>        public static string AESDecrypt(string encryptStr, bool returnNull)        {            string decrypt = AESDecrypt(encryptStr);            return returnNull ? decrypt : (decrypt == null ? String.Empty : decrypt);        }    }

C#_加密解密