c# 加密与解密

来源：互联网发布：苹果手机音乐软件编辑：程序博客网时间：2024/05/01 19:46
三种加密方法,代码如下：
using System.Security.Cryptography; using System.IO;  namespace Common {     /**//// <summary>     /// DESEncrypt加密解密算法。     /// </summary>     public sealed class DESEncrypt     {             private DESEncrypt()             {                     //                     // TODO: 在此处添加构造函数逻辑                     //             }             private static string key = "zhoufoxcn";             /**//// <summary>             /// 对称加密解密的密钥             /// </summary>             public static string Key             {                     get                     {                             return key;                     }                     set                     {                             key = value;                     }             }             /**//// <summary>             /// DES加密             /// </summary>             /// <param name="encryptString"></param>             /// <returns></returns>             public static string DesEncrypt(string encryptString)             {                     byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));                     byte[] keyIV = keyBytes;                     byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);                     DESCryptoServiceProvider provider = new DESCryptoServiceProvider();                     MemoryStream mStream = new MemoryStream();                     CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);                     cStream.Write(inputByteArray, 0, inputByteArray.Length);                     cStream.FlushFinalBlock();                     return Convert.ToBase64String(mStream.ToArray());             }             /**//// <summary>             /// DES解密             /// </summary>             /// <param name="decryptString"></param>             /// <returns></returns>             public static string DesDecrypt(string decryptString)             {                     byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));                     byte[] keyIV = keyBytes;                     byte[] inputByteArray = Convert.FromBase64String(decryptString);                     DESCryptoServiceProvider provider = new DESCryptoServiceProvider();                     MemoryStream mStream = new MemoryStream();                     CryptoStream cStream = new CryptoStream(mStream, provider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);                     cStream.Write(inputByteArray, 0, inputByteArray.Length);                     cStream.FlushFinalBlock();                     return Encoding.UTF8.GetString(mStream.ToArray());             }     }         /// <summary>     /// 一个实现MD5散列字符串的类     /// 作者：周公     /// 日期：2007     /// </summary>     public sealed class MD5Hashing     {         private static MD5 md5 = MD5.Create();         //私有化构造函数         private MD5Hashing()         {         }         /// <summary>         /// 使用utf8编码将字符串散列         /// </summary>         /// <param name="sourceString">要散列的字符串</param>         /// <returns>散列后的字符串</returns>         public static string HashString(string sourceString)         {             return HashString(Encoding.UTF8, sourceString);         }         /// <summary>         /// 使用指定的编码将字符串散列         /// </summary>         /// <param name="encode">编码</param>         /// <param name="sourceString">要散列的字符串</param>         /// <returns>散列后的字符串</returns>         public static string HashString(Encoding encode, string sourceString)         {             byte[] source = md5.ComputeHash(encode.GetBytes(sourceString));             StringBuilder sBuilder = new StringBuilder();             for (int i = 0; i < source.Length; i++)             {                 sBuilder.Append(source[i].ToString("x2"));             }             return sBuilder.ToString();         }     }    /// <summary>     /// 实现Base64加密解密     /// 作者：周公     /// 时间：2007     /// </summary>     public sealed class Base64    {        /// <summary>         /// Base64加密         /// </summary>         /// <param name="codeName">加密采用的编码方式</param>         /// <param name="source">待加密的明文</param>         /// <returns></returns>         public static string EncodeBase64(Encoding encode, string source)        {            byte[] bytes = encode.GetBytes(source);            string str;            try            {                str = Convert.ToBase64String(bytes);//Convert.ToBase64String(bytes);            }            catch            {                str = source; //encode = source;            }            return str;       //return encode        }        /// <summary>         /// Base64加密，采用utf8编码方式加密         /// </summary>         /// <param name="source">待加密的明文</param>         /// <returns>加密后的字符串</returns>         public static string EncodeBase64(string source)        {            return EncodeBase64(Encoding.UTF8, source);        }        /// <summary>         /// Base64解密         /// </summary>         /// <param name="codeName">解密采用的编码方式，注意和加密时采用的方式一致</param>         /// <param name="result">待解密的密文</param>         /// <returns>解密后的字符串</returns>         public static string DecodeBase64(Encoding encode, string result)        {            string decode = "";            byte[] bytes = Convert.FromBase64String(result);            try            {                decode = encode.GetString(bytes);            }            catch            {                decode = result;            }            return decode;        }        /// <summary>         /// Base64解密，采用utf8编码方式解密         /// </summary>         /// <param name="result">待解密的密文</param>         /// <returns>解密后的字符串</returns>         public static string DecodeBase64(string result)        {            return DecodeBase64(Encoding.UTF8, result);        }    }
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