ASP.NET 常用的字符串加密

字符串常用的加密有三种

1、MD5加密，这个常用于密码，单向加密，不可解密，有些在线解密的可以解大部份，用代码不能实现，如果不想让人解密，加密后随便截取一段就好了；

2、Base64位加密，通常加密后字符串尾会有两个 == ，可解密；

3、SHA加密，单向加密，安全性没MD5好。

以上不可解密都是相对的，这些加密算法都是跨平台的。

        using System.Web.Security;

        using System.Security.Cryptography;

        /// <summary>

        /// MD5函数

        /// </summary>

        /// <param name="val">原始字符串</param>

        /// <returns>MD5结果</returns>

        public static string MD5String(string val)

        {

            if (val.Trim().Equals(String.Empty) == true)

                return String.Empty;

            byte[] b = Encoding.UTF8.GetBytes(val);

            b = new MD5CryptoServiceProvider().ComputeHash(b);

            string ret = String.Empty;

            for (int i = 0; i < b.Length; i++)

                ret += b[i].ToString("x").PadLeft(2, '0');

            return ret;

        }

        /// <summary>

        /// SHA1字符串加密

        /// </summary>

        /// <param name="obj"></param>

        /// <returns></returns>

        public static string SHA1(string obj)

        {

            return FormsAuthentication.HashPasswordForStoringInConfigFile(obj, "SHA1");

        }

        /// <summary>

        /// SHA256字符串加密

        /// </summary>

        /// <param name="obj"></param>

        /// <returns></returns>

        public static string SHA256(string obj)

        {

            //return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(obj, "SHA256");

            byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(obj);

            SHA256 sha256 = new SHA256Managed();

            byte[] retVal = sha256.ComputeHash(bytValue);

            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < retVal.Length; i++)

            {

                sb.Append(retVal[i].ToString("x2"));

            }

            return sb.ToString();

        }

         /// <summary>

        /// Base64位加密

        /// </summary>

        /// <param name="val"></param>

        /// <returns></returns>

        public static string EncryptBase64(string val)

        {

            return Convert.ToBase64String(Encoding.UTF8.GetBytes(val));

        }

        /// <summary>

        /// Base64位解密

        /// </summary>

        /// <param name="val"></param>

        /// <returns></returns>

        public static string DecryptBase64(string val)

        {

            return Encoding.Default.GetString(Convert.FromBase64String(val));

        }

        /// <summary>

        /// BASE64位(MD5加密)[标准,非MD5加密再BASE64位加密]

        /// </summary>

        /// <param name="val">原始字符串</param>

        /// <returns>MD5结果</returns>

        public static string EncryptBase64AndMD5(string val)

        {

            if (val.Trim().Equals(String.Empty) == true)

                return String.Empty;

            MD5CryptoServiceProvider MD5CSP = new MD5CryptoServiceProvider();

            return Convert.ToBase64String(MD5CSP.ComputeHash(Encoding.UTF8.GetBytes(val)));

        }

也可以定义一个KEY，自定义加密算法

        /// <summary>

        /// DES加密字符串

        /// </summary>

        /// <param name="encryptString">待加密的字符串</param>

        /// <param name="encryptKey">加密密钥,要求为8位</param>

        /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>

        public static string Encode(string encryptString, string encryptKey)

        {

            encryptKey = UtilsString.SubString(encryptKey, 8);

            encryptKey = encryptKey.PadRight(8, ' ');

            byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));

            byte[] rgbIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

            byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

            DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();

            MemoryStream mStream = new MemoryStream();

            CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

            cStream.Write(inputByteArray, 0, inputByteArray.Length);

            cStream.FlushFinalBlock();

            return Convert.ToBase64String(mStream.ToArray());

        }

        /// <summary>

        /// DES解密字符串

        /// </summary>

        /// <param name="decryptString">待解密的字符串</param>

        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>

        /// <returns>解密成功返回解密后的字符串,失败返源串</returns>

        public static string Decode(string decryptString, string decryptKey)

        {

            decryptKey = UtilsString.SubString(decryptKey, 8);

            decryptKey = decryptKey.PadRight(8, ' ');

            byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);

            byte[] rgbIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

            byte[] inputByteArray = Convert.FromBase64String(decryptString);

            DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();

            MemoryStream mStream = new MemoryStream();

            CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

            cStream.Write(inputByteArray, 0, inputByteArray.Length);

            cStream.FlushFinalBlock();

            return Encoding.UTF8.GetString(mStream.ToArray());

        }

巴特西

ASP.NET 常用的字符串加密

最新文章

热门文章