• C#加密类


                 var es= EncryptSugar.GetInstance();
                 string word = "abc";
                 var wordEncrypt = es.Encrypto(word);//加密
                 var wordDecrypt = es.Decrypto(wordEncrypt);//解密
                 var wordMd5 = es.MD5(word);//md5加密
    

      

    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Security.Cryptography;
    using System.Xml;
    using System.IO;
    using System.Linq;
    namespace SyntacticSugar
    {
        /// <summary>
        /// ** 描述:加密类
        /// ** 创始时间:2015-6-30
        /// ** 修改时间:-
        /// ** 作者:sunkaixuan
        /// ** 使用说明:http://www.cnblogs.com/sunkaixuan/p/4610729.html
        /// </summary>
        public class EncryptSugar
        {
            private static readonly object _instanceLock = new object();
            private static EncryptSugar _instance = null;
            private static SymmetricAlgorithm mobjCryptoService;
            private static string _key;
            private static readonly object _cacheLock = new object();
            private static Dictionary<string, string> _cache = new Dictionary<string, string>();
            /// <summary>
            /// 最大缓存条数
            /// </summary>
            private static int _maxCacheNum = 10000;
    
            /// <summary>
            /// 对称加密类的构造函数
            /// </summary>
            public static EncryptSugar GetInstance()
            {
                if (_instance == null)
                {
                    lock (_instanceLock)
                    {
                        if (_instance == null)
                        {
                            mobjCryptoService = new RijndaelManaged();
                            _key = "Guz(%&as1213^^d(fa%(HilJ$lhj!y6&(*jkP87jH7";
                            _instance = new EncryptSugar();
                        }
                    }
                }
                return _instance;
            }
    
    
    
            /// <summary>
            /// 加密方法
            /// </summary>
            /// <param name="Source">待加密的串</param>
            /// <returns>经过加密的串</returns>
            public string Encrypto(string source)
            {
                if (_cache.ContainsKey(source))
                {
                    return _cache[source];
                }
    
                byte[] bytIn = UTF8Encoding.UTF8.GetBytes(source);
    
                MemoryStream ms = new MemoryStream();
    
                mobjCryptoService.Key = GetLegalKey();
    
                mobjCryptoService.IV = GetLegalIV();
    
                ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
    
                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
    
                cs.Write(bytIn, 0, bytIn.Length);
    
                cs.FlushFinalBlock();
    
                ms.Close();
    
                byte[] bytOut = ms.ToArray();
                string reval = Convert.ToBase64String(bytOut);
                lock (_cacheLock)
                {
                    if (_cache.Count > _maxCacheNum)
                    {
                        foreach (var it in _cache.Take(_maxCacheNum/5))
                        {
    
                            _cache.Remove(it.Key);
    
                        }
                    }
                    _cache.Add(source, reval);
                }
                return reval; ;
    
            }
    
            /// <summary>
            /// 解密方法
            /// </summary>
            /// <param name="Source">待解密的串</param>
            /// <returns>经过解密的串</returns>
            public string Decrypto(string source)
            {
                lock (_cacheLock)
                {
                    if (_cache.Any(it => it.Value == source))
                    {
                        return _cache.Single(it => it.Value == source).Key;
                    }
                }
    
                byte[] bytIn = Convert.FromBase64String(source);
    
                MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
    
                mobjCryptoService.Key = GetLegalKey();
    
                mobjCryptoService.IV = GetLegalIV();
    
                ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
    
                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
    
                StreamReader sr = new StreamReader(cs);
    
                return sr.ReadToEnd();
    
            }
    
            /// <summary>
            /// MD5加密,不可逆
            /// </summary>
            /// <param name="source"></param>
            /// <returns></returns>
            public string MD5(string source)
            {
                return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");
            }
    
            #region 私有函数
            /// <summary>
            /// 获得密钥
            /// </summary>
            /// <returns>密钥</returns>
            private byte[] GetLegalKey()
            {
    
                string sTemp = _key;
    
                mobjCryptoService.GenerateKey();
    
                byte[] bytTemp = mobjCryptoService.Key;
    
                int KeyLength = bytTemp.Length;
    
                if (sTemp.Length > KeyLength)
    
                    sTemp = sTemp.Substring(0, KeyLength);
    
                else if (sTemp.Length < KeyLength)
    
                    sTemp = sTemp.PadRight(KeyLength, ' ');
    
                return ASCIIEncoding.ASCII.GetBytes(sTemp);
    
            }
    
            /// <summary>
            /// 获得初始向量IV
            /// </summary>
            /// <returns>初试向量IV</returns>
            private byte[] GetLegalIV()
            {
    
                string sTemp = "asdfas&&dfg*$#+)*Y41sdgsdgs&*%$$$^&&GGslsadKdfK1";
    
                mobjCryptoService.GenerateIV();
    
                byte[] bytTemp = mobjCryptoService.IV;
    
                int IVLength = bytTemp.Length;
    
                if (sTemp.Length > IVLength)
    
                    sTemp = sTemp.Substring(0, IVLength);
    
                else if (sTemp.Length < IVLength)
    
                    sTemp = sTemp.PadRight(IVLength, ' ');
    
                return ASCIIEncoding.ASCII.GetBytes(sTemp);
    
            }
            #endregion
        }
    
    }
    

      

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  • 原文地址:https://www.cnblogs.com/sunkaixuan/p/4610729.html
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