lovebet议论数据加密的拍卖–提供各种算法处理。X509证书帮助类似。

多少的加密重点大家全知,很多景象下要对数码进行加密处理,但各种重要数据的加密要求无相同,有些需要常可接之,有些是未求可接之,可接之形似叫对如加密算法,不可逆的一般可改为不对如加密算法。如登录密码,一般比较好之艺术是以不可逆的加密算法,如MD5、SHA256、哈希数值等,当然也有使用可接之强度好有的的加密方法,在选加密键值的时光,变化一下吗终于比较不错的选择。另外一些为欺骗或者未受他人直接可以翻到,就动用其他的加密算法,如DES加密算法、AES的RijndaelManaged加密算法,或者为可以用Base64加密,甚至自己看齐一个颇变态的方法,就是之所以MD5加密的峰,内容虽然用Base64的办法加密,一般不知道底细的还确确实实不好处理。

类X509CertificatesHelper凡是自己于是来调用证书加解密的辅类似,贴出来要对大家有用!

在吉日《[挪火入魔失眠夜]浅尝辄止谈管理软件信息安全,用户称、密码的加密解密【附C#配套加密解密源码】》
的章中呢本着加密做了一部分介绍和剖析,并贴发了MD5、DES的加密方法代码,吉日的篇章图文并茂、哲理与幽默例子并存,本文有感而发,做一些互补,希望园子同行一起通过钻研,交流心得。

lovebet 1lovebet 2X509CertificatesHelper

加密字符串的不二法门有过多,也还足以通过如此的加密文件内容,不过较好之办法或是行使DES及AES两种植艺术来加密文书了,下面贴发出底代码中包含了加解密文件之算法。下面具体贴有我收藏之各种加密算法代码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;

 

namespace SSO.X509Certificates
{
    /// <summary>
    /// 证书帮助类似
    /// </summary>
    public class X509CertificatesHelper
    {
        #region 变量属性
        public static readonly X509CertificatesHelper Instance = new X509CertificatesHelper();

1、DES加密字符串及文件等

        private const int BUFFER_SIZE = 4*1024;

设想然接之算法,这种方法相似对,只要做动态密钥,就得做出强度比大之加密应用了。 

        //The identity provider’s certificate file name – must be in the application directory.
        private const string idpCertificateFileName = @”App_Data/Cer/SSO.pfx”;

         #region DES对如加密解密

        //The identity provider’s certificate/private key file password.
        private const string idpPassword = “password”;

        public const string DEFAULT_ENCRYPT_KEY = “12345678”;

        //The service provider’s certificate file name – must be in the application directory.
        private const string spCertificateFileName = @”App_Data/Cer/SSO.cer”;

        /// <summary>
        /// 使用默认加密
        /// </summary>
        /// <param name=”strText”></param>
        /// <returns></returns>
        public static string DesEncrypt(string strText)
        {
            try
            {
                return DesEncrypt(strText, DEFAULT_ENCRYPT_KEY);
            }
            catch
            {
                return “”;
            }
        }

        //The application key to the identity provider’s certificate.
        private const string IdPX509Certificate = “idpX509Certificate”;

        /// <summary>
        /// 使用默认解密
        /// </summary>
        /// <param name=”strText”></param>
        /// <returns></returns>
        public static string DesDecrypt(string strText)
        {
            try
            {
                return DesDecrypt(strText, DEFAULT_ENCRYPT_KEY);
            }
            catch
            {
                return “”;
            }
        }

        //The application key to the service provider’s certificate.
        private const string SPX509Certificate = “spX509Certificate”;

        /// <summary> 
        /// Encrypt the string 
        /// Attention:key must be 8 bits 
        /// </summary> 
        /// <param name=”strText”>string</param> 
        /// <param name=”strEncrKey”>key</param> 
        /// <returns></returns> 
        public static string DesEncrypt(string strText, string strEncrKey)
        {
            byte[] byKey = null;
            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

        // Load the IdP certificate
        private string idpfileName = string.Empty;

            byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Convert.ToBase64String(ms.ToArray());
        }

        private string spfileName = string.Empty;

        /// <summary> 
        /// Decrypt string 
        /// Attention:key must be 8 bits 
        /// </summary> 
        /// <param name=”strText”>Decrypt string</param> 
        /// <param name=”sDecrKey”>key</param> 
        /// <returns>output string</returns> 
        public static string DesDecrypt(string strText, string sDecrKey)
        {
            byte[] byKey = null;
            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            byte[] inputByteArray = new Byte[strText.Length];

        private X509Certificate2 cert_pfx;
        private X509Certificate2 cert_cer;

            byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            inputByteArray = Convert.FromBase64String(strText);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            Encoding encoding = new UTF8Encoding();
            return encoding.GetString(ms.ToArray());
        }

        /// <summary>
        /// 获取带密钥的证件
        /// </summary>
        public X509Certificate2 Cert_Pfx
        {
            get { return this.cert_pfx; }
        }

        /// <summary> 
        /// Encrypt files 
        /// Attention:key must be 8 bits 
        /// </summary> 
        /// <param name=”m_InFilePath”>Encrypt file path</param> 
        /// <param name=”m_OutFilePath”>output file</param> 
        /// <param name=”strEncrKey”>key</param> 
        public static void DesEncrypt(string m_InFilePath, string m_OutFilePath, string strEncrKey)
        {
            byte[] byKey = null;
            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

        /// <summary>
        /// 获取带公钥的证书
        /// </summary>
        public X509Certificate2 Cert_Cer
        {
            get { return this.cert_cer; }
        }
        #endregion

            byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
            FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);
            FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);
            fout.SetLength(0);
            //Create variables to help with read and write. 
            byte[] bin = new byte[100]; //This is intermediate storage for the encryption. 
            long rdlen = 0; //This is the total number of bytes written. 
            long totlen = fin.Length; //This is the total length of the input file. 
            int len; //This is the number of bytes to be written at a time. 

        #region 私有构造函数
        private X509CertificatesHelper()
        {
            this.idpfileName = FileSystemIOProxy.FileSystemIO.CombinePath(FileSystemIOProxy.AppPhysicalPath, idpCertificateFileName);
            this.spfileName = FileSystemIOProxy.FileSystemIO.CombinePath(FileSystemIOProxy.AppPhysicalPath, spCertificateFileName);

            DES des = new DESCryptoServiceProvider();
            CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);

            this.cert_pfx = LoadCertificate(idpfileName, idpPassword);
            this.cert_cer = LoadCertificate(spfileName, null);
        }
        #endregion

            //Read from the input file, then encrypt and write to the output file. 
            while (rdlen < totlen)
            {
                len = fin.Read(bin, 0, 100);
                encStream.Write(bin, 0, len);
                rdlen = rdlen + len;
            }
            encStream.Close();
            fout.Close();
            fin.Close();
        }

        #region 加载证书文件
        //Loads the certificate from file.
        //A password is only required if the file contains a private key.
        //The machine key set is specified so the certificate is accessible to the IIS process.
        private X509Certificate2 LoadCertificate(string fileName, string password)
        {
            if ( !File.Exists(fileName) )
            {
                throw new ArgumentException(
                    “The certificate file ” + fileName + ” doesn’t exist.”
                    );
            }

        /// <summary> 
        /// Decrypt files 
        /// Attention:key must be 8 bits 
        /// </summary> 
        /// <param name=”m_InFilePath”>Decrypt filepath</param> 
        /// <param name=”m_OutFilePath”>output filepath</param> 
        /// <param name=”sDecrKey”>key</param> 
        public static void DesDecrypt(string m_InFilePath, string m_OutFilePath, string sDecrKey)
        {
            byte[] byKey = null;
            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

            try
            {
                return new X509Certificate2(fileName, password, X509KeyStorageFlags.UserKeySet);
            }
            catch (Exception ex)
            {
                throw new ArgumentException(
                    “The certificate file ” + fileName + ” couldn’t be loaded – ” + ex.Message
                    );
            }
        }
        #endregion

            byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
            FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);
            FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);
            fout.SetLength(0);
            //Create variables to help with read and write. 
            byte[] bin = new byte[100]; //This is intermediate storage for the encryption. 
            long rdlen = 0; //This is the total number of bytes written. 
            long totlen = fin.Length; //This is the total length of the input file. 
            int len; //This is the number of bytes to be written at a time. 

        #region 加密

            DES des = new DESCryptoServiceProvider();
            CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name=”source”>明文</param>
        /// <returns></returns>
        public byte[] EncryptToByteArray(string source)
        {
            return EncryptToByteArray(Encoding.UTF8.GetBytes(source));
        }

            //Read from the input file, then encrypt and write to the output file. 
            while (rdlen < totlen)
            {
                len = fin.Read(bin, 0, 100);
                encStream.Write(bin, 0, len);
                rdlen = rdlen + len;
            }
            encStream.Close();
            fout.Close();
            fin.Close();
        } 
        #endregion

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name=”source”>明文</param>
        /// <returns></returns>
        public string EncryptToString(byte[] source)
        {
            return Convert.ToBase64String(EncryptToByteArray(source));
        }

 

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name=”source”>明文</param>
        /// <returns></returns>
        public string EncryptToString(string source)
        {
            return Convert.ToBase64String(EncryptToByteArray(Encoding.UTF8.GetBytes(source)));
        }

 

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name=”source”>明文</param>
        /// <returns></returns>
        public byte[] EncryptToByteArray(byte[] source)
        {
            byte[] str_out;

2、 对如加密算法AES RijndaelManaged加密解密

            using (MemoryStream fin = new MemoryStream(source),fout = new MemoryStream() )
            {
                long lSize = fin.Length; // 输入文件长度 
                int size = (int)lSize;
                byte[] bytes = new byte[BUFFER_SIZE]; // 缓存 
                int read = -1; // 输入文件读取数量 

         #region 对如加密算法AES RijndaelManaged加密解密

                byte[] key;//密钥 
                byte[] iv;//初始向量 
                byte[] ctkey;//以密文形式是的密钥 
                byte[] ctiv;//以密文形式在的启向量 

        private static readonly string Default_AES_Key = “@#kim123”;
        private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79,
                                             0x53,0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };

                SymmetricAlgorithm sma = Rijndael.Create();
                sma.GenerateKey();
                sma.GenerateIV();

        /// <summary>
        /// 对如加密算法AES RijndaelManaged加密(RijndaelManaged(AES)算法是块式加密算法)
        /// </summary>
        /// <param name=”encryptString”>待加密字符串</param>
        /// <returns>加密结果字符串</returns>
        public static string AES_Encrypt(string encryptString)
        {
            return AES_Encrypt(encryptString, Default_AES_Key);
        }

                key = sma.Key;
                iv = sma.IV;

        /// <summary>
        /// 对如加密算法AES RijndaelManaged加密(RijndaelManaged(AES)算法是块式加密算法)
        /// </summary>
        /// <param name=”encryptString”>待加密字符串</param>
        /// <param name=”encryptKey”>加密密钥,须半竞赛字符</param>
        /// <returns>加密结果字符串</returns>
        public static string AES_Encrypt(string encryptString, string encryptKey)
        {
            encryptKey = GetSubString(encryptKey, 32, “”);
            encryptKey = encryptKey.PadRight(32, ‘ ‘);

                //加密用cer证书提取公钥即可 
                RSACryptoServiceProvider crypto_enc = (RSACryptoServiceProvider)cert_cer.PublicKey.Key;
                ctkey = crypto_enc.Encrypt(key, false);
                ctiv = crypto_enc.Encrypt(iv, false);

            RijndaelManaged rijndaelProvider = new RijndaelManaged();
            rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
            rijndaelProvider.IV = Keys;
            ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();

                BinaryWriter bb = new BinaryWriter(fout, Encoding.UTF8);
                long kl = (long)ctkey.Length;
                long il = (long)ctiv.Length;

            byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
            byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);

                //写副密钥和向量长度
                bb.Write(kl);
                bb.Write(il);

            return Convert.ToBase64String(encryptedData);
        }

                //写副密钥和向量内容
                fout.Write(ctkey, 0, (int)kl);
                fout.Write(ctiv, 0, (int)il);
                
                using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    BinaryWriter bw = new BinaryWriter(fout, Encoding.UTF8);

        /// <summary>
        /// 对如加密算法AES RijndaelManaged解密字符串
        /// </summary>
        /// <param name=”decryptString”>待解密的字符串</param>
        /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
        public static string AES_Decrypt(string decryptString)
        {
            return AES_Decrypt(decryptString, Default_AES_Key);
        }

                    //写副原文长度
                    bw.Write(lSize);

        /// <summary>
        /// 对如加密算法AES RijndaelManaged解密字符串
        /// </summary>
        /// <param name=”decryptString”>待解密之字符串</param>
        /// <param name=”decryptKey”>解密密钥,和加密密钥相同</param>
        /// <returns>解密成功返回解密后底字符串,失败返回空</returns>
        public static string AES_Decrypt(string decryptString, string decryptKey)
        {
            try
            {
                decryptKey = GetSubString(decryptKey, 32, “”);
                decryptKey = decryptKey.PadRight(32, ‘ ‘);

                    //写副原文加密后文本(将数据流链接到加密转换的流动)
                    while ((read = fin.Read(bytes, 0, bytes.Length)) != 0)
                    {
                        cout.Write(bytes, 0, read);
                        cout.FlushFinalBlock();
                    }

                RijndaelManaged rijndaelProvider = new RijndaelManaged();
                rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
                rijndaelProvider.IV = Keys;
                ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();

                    cout.Flush();

                byte[] inputData = Convert.FromBase64String(decryptString);
                byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);

                    str_out = fout.ToArray();
                    

                return Encoding.UTF8.GetString(decryptedData);
            }
            catch
            {
                return string.Empty;
            }
        }

                    cout.Close();
                }
            }

        /// <summary>
        /// 按字节长度(按字节,一个汉字呢2单字节)取得某字符串的一模一样片
        /// </summary>
        /// <param name=”sourceString”>源字符串</param>
        /// <param name=”length”>所得到字符串字节长度</param>
        /// <param name=”tailString”>附加字符串(当字符串不敷长时,尾部所增长的字符串,一般也”…”)</param>
        /// <returns>某字符串的平有的</returns>
        private static string GetSubString(string sourceString, int length, string tailString)
        {
            return GetSubString(sourceString, 0, length, tailString);
        }

            return str_out;
        }
        #endregion

        /// <summary>
        /// 按字节长度(按字节,一个汉字为2只字节)取得某字符串的相同片段
        /// </summary>
        /// <param name=”sourceString”>源字符串</param>
        /// <param name=”startIndex”>索引位置,以0开始</param>
        /// <param name=”length”>所获字符串字节长度</param>
        /// <param name=”tailString”>附加字符串(当字符串不足够长时,尾部所添加的字符串,一般为”…”)</param>
        /// <returns>某字符串的同样组成部分</returns>
        private static string GetSubString(string sourceString, int startIndex, int length, string tailString)
        {
            string myResult = sourceString;

        #region 解密

            //当是日文或韩文时(注:中文的克:\u4e00 – \u9fa5, 日文在\u0800 – \u4e00, 韩文为\xAC00-\xD7A3)
            if (System.Text.RegularExpressions.Regex.IsMatch(sourceString, “[\u0800-\u4e00]+”) ||
                System.Text.RegularExpressions.Regex.IsMatch(sourceString, “[\xAC00-\xD7A3]+”))
            {
                //当截取的发端位置超出字段串长时
                if (startIndex >= sourceString.Length)
                {
                    return string.Empty;
                }
                else
                {
                    return sourceString.Substring(startIndex,
                                                   ((length + startIndex) > sourceString.Length) ? (sourceString.Length – startIndex) : length);
                }
            }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name=”source”>密文</param>
        /// <returns></returns>
        public byte[] DecrytpToByteArray(string source)
        {
            return DecrytpToByteArray(Convert.FromBase64String(source));
        }

            //中文字符,如”中国老百姓abcd123″
            if (length <= 0)
            {
                return string.Empty;
            }
            byte[] bytesSource = Encoding.Default.GetBytes(sourceString);

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name=”source”>密文</param>
        /// <returns></returns>
        public string DecrytpToString(byte[] source)
        {
            return Encoding.UTF8.GetString(DecrytpToByteArray(source));
        }

            //当字符串长度超过起始位置
            if (bytesSource.Length > startIndex)
            {
                int endIndex = bytesSource.Length;

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name=”source”>密文</param>
        /// <returns></returns>
        public string DecrytpToString(string source)
        {
            return Encoding.UTF8.GetString(DecrytpToByteArray(Convert.FromBase64String(source)));
        }

                //当要截取的长短在字符串的得力长度限制外
                if (bytesSource.Length > (startIndex + length))
                {
                    endIndex = length + startIndex;
                }
                else
                {   //当不以有效限制外经常,只取得到字符串的末梢
                    length = bytesSource.Length – startIndex;
                    tailString = “”;
                }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name=”source”>密文</param>
        /// <returns></returns>
        public byte[] DecrytpToByteArray(byte[] source)
        {
            byte[] str_out;

                int[] anResultFlag = new int[length];
                int nFlag = 0;
                //字节大于127吧双字节字符
                for (int i = startIndex; i < endIndex; i++)
                {
                    if (bytesSource[i] > 127)
                    {
                        nFlag++;
                        if (nFlag == 3)
                        {
                            nFlag = 1;
                        }
                    }
                    else
                    {
                        nFlag = 0;
                    }
                    anResultFlag[i] = nFlag;
                }
                //最后一个字节为双字节字符的一半
                if ((bytesSource[endIndex – 1] > 127) && (anResultFlag[length – 1] == 1))
                {
                    length = length + 1;
                }

            using (MemoryStream fin = new MemoryStream(source), fout = new MemoryStream())
            {
                int size = (int)fin.Length;
                byte[] bytes = new byte[BUFFER_SIZE];
                int read = -1;
                int value = 0;
                int outValue = 0;

                byte[] bsResult = new byte[length];
                Array.Copy(bytesSource, startIndex, bsResult, 0, length);
                myResult = Encoding.Default.GetString(bsResult);
                myResult = myResult + tailString;

                BinaryReader bb = new BinaryReader(fin, Encoding.UTF8);
                long kl = bb.ReadInt64();
                long il = bb.ReadInt64();

                return myResult;
            }

                byte[] ctkey = new byte[kl];
                byte[] ctiv = new byte[il];

            return string.Empty;

                fin.Read(ctkey, 0, (int)kl);
                fin.Read(ctiv, 0, (int)il);

        }

                //解密需要从pfx证书中提取私钥 
                RSACryptoServiceProvider crypto_dec = (RSACryptoServiceProvider)cert_pfx.PrivateKey;
                byte[] ptkey = crypto_dec.Decrypt(ctkey, false);
                byte[] ptiv = crypto_dec.Decrypt(ctiv, false);

        /// <summary>
        /// 加密文件流
        /// </summary>
        /// <param name=”fs”></param>
        /// <returns></returns>
        public static CryptoStream AES_EncryptStrream(FileStream fs, string decryptKey)
        {
            decryptKey = GetSubString(decryptKey, 32, “”);
            decryptKey = decryptKey.PadRight(32, ‘ ‘);

                SymmetricAlgorithm sma = SymmetricAlgorithm.Create();
                sma.Key = ptkey;
                sma.IV = ptiv;

            RijndaelManaged rijndaelProvider = new RijndaelManaged();
            rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
            rijndaelProvider.IV = Keys;

                value = 32;
                long lSize = 0;

            ICryptoTransform encrypto = rijndaelProvider.CreateEncryptor();
            CryptoStream cytptostreamEncr = new CryptoStream(fs, encrypto, CryptoStreamMode.Write);
            return cytptostreamEncr;
        }

                using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read))
                {

        /// <summary>
        /// 解密文件流
        /// </summary>
        /// <param name=”fs”></param>
        /// <returns></returns>
        public static CryptoStream AES_DecryptStream(FileStream fs, string decryptKey)
        {
            decryptKey = GetSubString(decryptKey, 32, “”);
            decryptKey = decryptKey.PadRight(32, ‘ ‘);

                    BinaryReader br = new BinaryReader(fin, Encoding.UTF8); 
                    lSize = br.ReadInt64(); 

            RijndaelManaged rijndaelProvider = new RijndaelManaged();
            rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
            rijndaelProvider.IV = Keys;
            ICryptoTransform Decrypto = rijndaelProvider.CreateDecryptor();
            CryptoStream cytptostreamDecr = new CryptoStream(fs, Decrypto, CryptoStreamMode.Read);
            return cytptostreamDecr;
        }

                    long numReads = lSize / BUFFER_SIZE; 

        /// <summary>
        /// 对点名文件加密
        /// </summary>
        /// <param name=”InputFile”></param>
        /// <param name=”OutputFile”></param>
        /// <returns></returns>
        public static bool AES_EncryptFile(string InputFile, string OutputFile)
        {
            try
            {
                string decryptKey = “www.iqidi.com”;

                    long slack = (long)lSize % BUFFER_SIZE; 

                FileStream fr = new FileStream(InputFile, FileMode.Open);
                FileStream fren = new FileStream(OutputFile, FileMode.Create);
                CryptoStream Enfr = AES_EncryptStrream(fren, decryptKey);
                byte[] bytearrayinput = new byte[fr.Length];
                fr.Read(bytearrayinput, 0, bytearrayinput.Length);
                Enfr.Write(bytearrayinput, 0, bytearrayinput.Length);
                Enfr.Close();
                fr.Close();
                fren.Close();
            }
            catch
            {
                //文件异常
                return false;
            }
            return true;
        }

                    for (int i = 0; i < numReads; ++i) 
                    { 
                        read = cin.Read(bytes, 0, bytes.Length); 
                        fout.Write(bytes, 0, read); 
                        value += read; 
                        outValue += read; 
                    } 

        /// <summary>
        /// 对点名的公文解压缩
        /// </summary>
        /// <param name=”InputFile”></param>
        /// <param name=”OutputFile”></param>
        /// <returns></returns>
        public static bool AES_DecryptFile(string InputFile, string OutputFile)
        {
            try
            {
                string decryptKey = “www.iqidi.com”;
                FileStream fr = new FileStream(InputFile, FileMode.Open);
                FileStream frde = new FileStream(OutputFile, FileMode.Create);
                CryptoStream Defr = AES_DecryptStream(fr, decryptKey);
                byte[] bytearrayoutput = new byte[1024];
                int m_count = 0;

                    if (slack > 0) 
                    { 
                        read = cin.Read(bytes, 0, (int)slack); 
                        fout.Write(bytes, 0, read); 
                        value += read; 
                        outValue += read; 
                    }

                do
                {
                    m_count = Defr.Read(bytearrayoutput, 0, bytearrayoutput.Length);
                    frde.Write(bytearrayoutput, 0, m_count);
                    if (m_count < bytearrayoutput.Length)
                        break;
                } while (true);

                    fout.Flush();

                Defr.Close();
                fr.Close();
                frde.Close();
            }
            catch
            {
                //文件异常
                return false;
            }
            return true;
        }
        
        #endregion

                    str_out = fout.ToArray();

 

                    fout.Close();
                }

 

                //比较加密前之长短和解密后底长度
                if (outValue != lSize)
                {
                    return null;
                }
                else
                {
                    return str_out;
                }
            }
        }
        #endregion
    }
}

3、  Base64加密解密算法

 

         #region Base64加密解密

        /// <summary>
        /// Base64凡同样種使用64基底位置計數法。它应用2的顶可怜次方來代表僅可列印的ASCII 字元。
        /// 這使她可用來作為電子郵件的傳輸編碼。在Base64中的變數使用字元A-Z、a-z和0-9 ,
        /// 這樣共有62個字元,用來作為開始的64個數字,最後兩個用來作為數字的符號在不同的
        /// 系統中而异。
        /// Base64加密
        /// </summary>
        /// <param name=”str”></param>
        /// <returns></returns>
        public static string Base64Encrypt(string str)
        {
            byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(str);
            return Convert.ToBase64String(encbuff);
        }

        /// <summary>
        /// Base64解密
        /// </summary>
        /// <param name=”str”></param>
        /// <returns></returns>
        public static string Base64Decrypt(string str)
        {
            byte[] decbuff = Convert.FromBase64String(str);
            return System.Text.Encoding.UTF8.GetString(decbuff);
        } 
        #endregion

 

 

4、 MD5加密跟说明

MD5的加密处理下或于多,由于破解难度很大,基本上大型网站要软件商,密码加密一般下这种方式多。

要MD5可以就此来得到32、
16、8抵整套有些内容加密内容,也堪取得其加密后底哈希值。

         /// <summary>

        /// 获得32位的MD5加密
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string GetMD5_32(string input)
        {
            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
            byte[] data = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(input));
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < data.Length; i++)
            {
                sb.Append(data[i].ToString(“x2”));
            }
            return sb.ToString();
        }

        /// <summary>
        /// 获得16位的MD5加密
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string GetMD5_16(string input)
        {
            return GetMD5_32(input).Substring(8, 16);
        }
        /// <summary>
        /// 获得8位的MD5加密
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string GetMD5_8(string input)
        {
            return GetMD5_32(input).Substring(8, 8);
        }
        /// <summary>
        /// 获得4位的MD5加密
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string GetMD5_4(string input)
        {
            return GetMD5_32(input).Substring(8, 4);
        }

        public static string MD5EncryptHash(String input)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            //the GetBytes method returns byte array equavalent of a string
            byte[] res = md5.ComputeHash(Encoding.Default.GetBytes(input), 0, input.Length);
            char[] temp = new char[res.Length];
            //copy to a char array which can be passed to a String constructor
            Array.Copy(res, temp, res.Length);
            //return the result as a string
            return new String(temp);
        }

 

 

5、 对文件添加MD5标签及说明

这种办法比较好玩,我吧是近些年才意识其间的神秘,其实我们为预防文件为改动,可以使这种办法预先添加MD5码,然后于程序代码中展开认证,这样至少可减小部分篡改的行为吧,因为要是文件有些少的改,Md5码将会发生变化的,呵呵。

         #region MD5签验证

        /// <summary>
        /// 对加文件路径的文本加上标签
        /// </summary>
        /// <param name=”path”>要加密的文书之路</param>
        /// <returns>标签的值</returns>
        public static bool AddMD5(string path)
        {
            bool IsNeed = true;

            if (CheckMD5(path))                                  //已进行MD5处理
                IsNeed = false;

            try
            {
                FileStream fsread = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
                byte[] md5File = new byte[fsread.Length];
                fsread.Read(md5File, 0, (int)fsread.Length);                               // 将文件流读取到Buffer中
                fsread.Close();

                if (IsNeed)
                {
                    string result = MD5Buffer(md5File, 0, md5File.Length);             // 对Buffer中的字节内容算MD5
                    byte[] md5 = System.Text.Encoding.ASCII.GetBytes(result);       // 将字符串转换成字节数组以便写人到文件中
                    FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);
                    fsWrite.Write(md5File, 0, md5File.Length);                               // 将文件,MD5值 重新描绘副到文件中。
                    fsWrite.Write(md5, 0, md5.Length);
                    fsWrite.Close();
                }
                else
                {
                    FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);
                    fsWrite.Write(md5File, 0, md5File.Length);
                    fsWrite.Close();
                }
            }
            catch
            {
                return false;
            }

            return true;
        }

        /// <summary>
        /// 对吃一定路的文书进行说明
        /// </summary>
        /// <param name=”path”></param>
        /// <returns>是否加了标签或者否标签值与内容值一致</returns>
        public static bool CheckMD5(string path)
        {
            try
            {
                FileStream get_file = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
                byte[] md5File = new byte[get_file.Length];                                      // 读入文件
                get_file.Read(md5File, 0, (int)get_file.Length);
                get_file.Close();

                string result = MD5Buffer(md5File, 0, md5File.Length – 32);             // 对文本除最后32个外的字节计算MD5,这个32凡是坐标签号呢32号。
                string md5 = System.Text.Encoding.ASCII.GetString(md5File, md5File.Length – 32, 32);   //读取文件最后32个,其中保存的虽是MD5值
                return result == md5;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 计算文件的MD5值
        /// </summary>
        /// <param name=”MD5File”>MD5签名文件字符数组</param>
        /// <param name=”index”>计算起始位置</param>
        /// <param name=”count”>计算终止位置</param>
        /// <returns>计算结果</returns>
        private static string MD5Buffer(byte[] MD5File, int index, int count)
        {
            System.Security.Cryptography.MD5CryptoServiceProvider get_md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
            byte[] hash_byte = get_md5.ComputeHash(MD5File, index, count);
            string result = System.BitConverter.ToString(hash_byte);

            result = result.Replace(“-“, “”);
            return result;
        } 
        #endregion

 

 

6、 SHA256加密算法

         /// <summary>

        /// SHA256函数
        /// </summary>
        /// <param name=”str”>原始字符串</param>
        /// <returns>SHA256结果(返回长度也44字节之字符串)</returns>
        public static string SHA256(string str)
        {
            byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
            SHA256Managed Sha256 = new SHA256Managed();
            byte[] Result = Sha256.ComputeHash(SHA256Data);
            return Convert.ToBase64String(Result);  //返回长度为44字节之字符串
        }

 

 

7、 MD5及Base64结合加密

这种重组方式为是比不易的算法,至少是四免像,一般分析比艰苦,比较有迷惑性,就是挂羊头,卖狗肉的表现,其实Base64加密方法,也堪开的比较复杂,不自然是者的那种解决智的,你可以增长一些较为复杂的算法在中的。 

         /// <summary>

        /// 加密字符串
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string EncryptString(string input)
        {
            return MD5Util.AddMD5Profix(Base64Util.Encrypt(MD5Util.AddMD5Profix(input)));
            //return Base64.Encrypt(MD5.AddMD5Profix(Base64.Encrypt(input)));
        }

        /// <summary>
        /// 解密加过密的字符串
        /// </summary>
        /// <param name=”input”></param>
        /// <param name=”throwException”>解密失败是否摒弃大</param>
        /// <returns></returns>
        public static string DecryptString(string input, bool throwException)
        {
            string res = “”;
            try
            {
                res = input;// Base64.Decrypt(input);
                if (MD5Util.ValidateValue(res))
                {
                    return MD5Util.RemoveMD5Profix(Base64Util.Decrypt(MD5Util.RemoveMD5Profix(res)));
                }
                else
                {
                    throw new Exception(“字符串无法换成!”);
                }
            }
            catch
            {
                if (throwException)
                {
                    throw;
                }
                else
                {
                    return “”;
                }
            }
        }

//———–下面是MD5Util下面的函数

        /// <summary>
        /// 添加MD5的前缀,便于检查来无篡改
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string AddMD5Profix(string input)
        {
            return GetMD5_4(input) + input;
        }
        /// <summary>
        /// 移除MD5的前缀
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string RemoveMD5Profix(string input)
        {
            return input.Substring(4);
        }
        /// <summary>
        /// 验证MD5前方缀处理的字符串有管叫歪曲
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static bool ValidateValue(string input)
        {
            bool res = false;
            if (input.Length >= 4)
            {
                string tmp = input.Substring(4);
                if (input.Substring(0, 4) == GetMD5_4(tmp))
                {
                    res = true;
                }
            }
            return res;
        }

 

 

 如下面代码就是端提到的Base64Util中之内容,好像算法处理还是比辛苦,也粘出大家研读一下吧。

    /// <summary>
    /// 基于Base64的加密编码,
    /// 可以装不同之密码表来得到不同的编码合解码
    /// </summary>
    public class Base64Util
    {
        public Base64Util()
        {
            this.InitDict();
        }

        protected static Base64Util s_b64 = new Base64Util();

        /// <summary>
        /// 使用默认的密码表加密字符串
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string Encrypt(string input)
        {
            return s_b64.Encode(input);
        }
        /// <summary>
        /// 使用默认的密码表解密字符串
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        public static string Decrypt(string input)
        {
            return s_b64.Decode(input);
        }

        /// <summary>
        /// 获取具有标准的Base64密码表的加密类
        /// </summary>
        /// <returns></returns>
        public static Base64Util GetStandardBase64()
        {
            Base64Util b64 = new Base64Util();
            b64.Pad = “=”;
            b64.CodeTable = “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/”;
            return b64;
        }

        protected string m_codeTable = @”ABCDEFGHIJKLMNOPQRSTUVWXYZbacdefghijklmnopqrstu_wxyz0123456789*-“;
        protected string m_pad = “v”;
        protected Dictionary<int, char> m_t1 = new Dictionary<int, char>();
        protected Dictionary<char, int> m_t2 = new Dictionary<char, int>();

        /// <summary>
        /// 密码表
        /// </summary>
        public string CodeTable
        {
            get { return m_codeTable; }
            set
            {
                if (value == null)
                {
                    throw new Exception(“密码表不能够也null”);
                }
                else if (value.Length < 64)
                {
                    throw new Exception(“密码表长度要至少为64”);
                }
                else
                {
                    this.ValidateRepeat(value);
                    this.ValidateEqualPad(value, m_pad);
                    m_codeTable = value;
                    this.InitDict();
                }
            }
        }
        /// <summary>
        /// 补码
        /// </summary>
        public string Pad
        {
            get { return m_pad; }
            set
            {
                if (value == null)
                {
                    throw new Exception(“密码表的补码不可知啊null”);
                }
                else if (value.Length != 1)
                {
                    throw new Exception(“密码表的补码长度要也1”);
                }
                else
                {
                    this.ValidateEqualPad(m_codeTable, value);
                    m_pad = value;
                    this.InitDict();
                }
            }
        }

        /// <summary>
        /// 返回编码后的字符串
        /// </summary>
        /// <param name=”source”></param>
        /// <returns></returns>
        public string Encode(string source)
        {
            if (source == null || source == “”)
            {
                return “”;
            }
            else
            {
                StringBuilder sb = new StringBuilder();
                byte[] tmp = System.Text.UTF8Encoding.UTF8.GetBytes(source);
                int remain = tmp.Length % 3;
                int patch = 3 – remain;
                if (remain != 0)
                {
                    Array.Resize(ref tmp, tmp.Length + patch);
                }
                int cnt = (int)Math.Ceiling(tmp.Length * 1.0 / 3);
                for (int i = 0; i < cnt; i++)
                {
                    sb.Append(this.EncodeUnit(tmp[i * 3], tmp[i * 3 + 1], tmp[i * 3 + 2]));
                }
                if (remain != 0)
                {
                    sb.Remove(sb.Length – patch, patch);
                    for (int i = 0; i < patch; i++)
                    {
                        sb.Append(m_pad);
                    }
                }
                return sb.ToString();
            }

        }
        protected string EncodeUnit(params byte[] unit)
        {
            int[] obj = new int[4];
            obj[0] = (unit[0] & 0xfc) >> 2;
            obj[1] = ((unit[0] & 0x03) << 4) + ((unit[1] & 0xf0) >> 4);
            obj[2] = ((unit[1] & 0x0f) << 2) + ((unit[2] & 0xc0) >> 6);
            obj[3] = unit[2] & 0x3f;
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < obj.Length; i++)
            {
                sb.Append(this.GetEC((int)obj[i]));
            }
            return sb.ToString();
        }
        protected char GetEC(int code)
        {
            return m_t1[code];//m_codeTable[code];
        }

        /// <summary>
        /// 获得解码字符串
        /// </summary>
        /// <param name=”source”></param>
        /// <returns></returns>
        public string Decode(string source)
        {
            if (source == null || source == “”)
            {
                return “”;
            }
            else
            {
                List<byte> list = new List<byte>();
                char[] tmp = source.ToCharArray();
                int remain = tmp.Length % 4;
                if (remain != 0)
                {
                    Array.Resize(ref tmp, tmp.Length – remain);
                }
                int patch = source.IndexOf(m_pad);
                if (patch != -1)
                {
                    patch = source.Length – patch;
                }
                int cnt = tmp.Length / 4;
                for (int i = 0; i < cnt; i++)
                {
                    this.DecodeUnit(list, tmp[i * 4], tmp[i * 4 + 1], tmp[i * 4 + 2], tmp[i * 4 + 3]);
                }
                for (int i = 0; i < patch; i++)
                {
                    list.RemoveAt(list.Count – 1);
                }
                return System.Text.Encoding.UTF8.GetString(list.ToArray());
            }
        }
        protected void DecodeUnit(List<byte> byteArr, params char[] chArray)
        {
            int[] res = new int[3];
            byte[] unit = new byte[chArray.Length];
            for (int i = 0; i < chArray.Length; i++)
            {
                unit[i] = this.FindChar(chArray[i]);
            }
            res[0] = (unit[0] << 2) + ((unit[1] & 0x30) >> 4);
            res[1] = ((unit[1] & 0xf) << 4) + ((unit[2] & 0x3c) >> 2);
            res[2] = ((unit[2] & 0x3) << 6) + unit[3];
            for (int i = 0; i < res.Length; i++)
            {
                byteArr.Add((byte)res[i]);
            }
        }
        protected byte FindChar(char ch)
        {
            int pos = m_t2[ch];//m_codeTable.IndexOf(ch);
            return (byte)pos;
        }

        /// <summary>
        /// 初始化双向哈西字典
        /// </summary>
        protected void InitDict()
        {
            m_t1.Clear();
            m_t2.Clear();
            m_t2.Add(m_pad[0], -1);
            for (int i = 0; i < m_codeTable.Length; i++)
            {
                m_t1.Add(i, m_codeTable[i]);
                m_t2.Add(m_codeTable[i], i);
            }
        }
        /// <summary>
        /// 检查字符串中的字符是否出双重
        /// </summary>
        /// <param name=”input”></param>
        /// <returns></returns>
        protected void ValidateRepeat(string input)
        {
            for (int i = 0; i < input.Length; i++)
            {
                if (input.LastIndexOf(input[i]) > i)
                {
                    throw new Exception(“密码表中涵盖更字符:” + input[i]);
                }
            }
        }
        /// <summary>
        /// 检查字符串是否包含补码字符
        /// </summary>
        /// <param name=”input”></param>
        /// <param name=”pad”></param>
        protected void ValidateEqualPad(string input, string pad)
        {
            if (input.IndexOf(pad) > -1)
            {
                throw new Exception(“密码表中蕴含了补码字符:” + pad);
            }
        }
    }