简单加密算法在C#中的实现

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加密是指通过某种特殊的方法，更改已有信息的内容，是的未授权的用户即使得到了加密的信息，如果没有正确的解密算法，
那么也无法得到信息的内容。

方法一：
    //须添加对System.Web的引用 
    using System.Web.Security; 
     
    ... 
     
    /// <summary> 
    /// SHA1加密字符串 
    /// </summary> 
    /// <param name="source">源字符串</param> 
    /// <returns>加密后的字符串</returns> 
    public string SHA1(string source) 
    { 
        return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1"); 
    } 
 
 
    /// <summary> 
    /// MD5加密字符串 
    /// </summary> 
    /// <param name="source">源字符串</param> 
    /// <returns>加密后的字符串</returns> 
    public string MD5(string source) 
    { 
        return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");; 
    }
 方法二(可逆加密解密)：
    using System.Security.Cryptography; 
     
    ... 
     
    public string Encode(string data) 
    { 
        byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); 
        byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); 
     
        DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 
        int i = cryptoProvider.KeySize; 
        MemoryStream ms = new MemoryStream(); 
        CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write); 
     
        StreamWriter sw = new StreamWriter(cst); 
        sw.Write(data); 
        sw.Flush(); 
        cst.FlushFinalBlock(); 
        sw.Flush(); 
        return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length); 
     
    } 
     
    public string Decode(string data) 
    { 
        byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); 
        byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); 
     
        byte[] byEnc; 
        try
        { 
            byEnc = Convert.FromBase64String(data); 
        } 
        catch
        { 
            return null; 
        } 
     
        DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 
        MemoryStream ms = new MemoryStream(byEnc); 
        CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read); 
        StreamReader sr = new StreamReader(cst); 
        return sr.ReadToEnd(); 
    }
方法三(MD5不可逆)：
    using System.Security.Cryptography; 
     
    ... 
     
    //MD5不可逆加密 
     
    //32位加密 
     
    public string GetMD5_32(string s, string _input_charset) 
    { 
        MD5 md5 = new MD5CryptoServiceProvider(); 
        byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s)); 
        StringBuilder sb = new StringBuilder(32); 
        for (int i = 0; i < t.Length; i++) 
        { 
            sb.Append(t[i].ToString("x").PadLeft(2, '0')); 
        } 
        return sb.ToString(); 
    } 
     
    //16位加密 
    public static string GetMd5_16(string ConvertString) 
    { 
        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); 
        string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8); 
        t2 = t2.Replace("-", ""); 
        return t2; 
    }
方法四(对称加密)：
    using System.IO; 
    using System.Security.Cryptography; 
     
    ... 
     
    private SymmetricAlgorithm mobjCryptoService; 
    private string Key; 
    /// <summary>    
    /// 对称加密类的构造函数    
    /// </summary>    
    public SymmetricMethod() 
    { 
        mobjCryptoService = new RijndaelManaged(); 
        Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7"; 
    } 
    /// <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 = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk"; 
        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); 
    } 
    /// <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) 
    { 
        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(); 
        return Convert.ToBase64String(bytOut); 
    } 
    /// <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) 
    { 
        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(); 
    }
方法五：
    using System.IO; 
    using System.Security.Cryptography; 
    using System.Text; 
     
    ... 
     
    //默认密钥向量 
    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; 
    /// <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 EncryptDES(string encryptString, string encryptKey) 
    { 
        try
        { 
            byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); 
            byte[] rgbIV = Keys; 
            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()); 
        } 
        catch
        { 
            return encryptString; 
        } 
    } 
     
    /// <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 DecryptDES(string decryptString, string decryptKey) 
    { 
        try
        { 
            byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey); 
            byte[] rgbIV = Keys; 
            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()); 
        } 
        catch
        { 
            return decryptString; 
        } 
    }
方法六(文件加密)：
    using System.IO; 
    using System.Security.Cryptography; 
    using System.Text; 
     
    ... 
     
    //加密文件 
    private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV) 
    { 
        //Create the file streams to handle the input and output files. 
        FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read); 
        FileStream fout = new FileStream(outName, 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. 
     
        DES des = new DESCryptoServiceProvider(); 
        CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write); 
     
        //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(); 
    } 
     
    //解密文件 
    private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV) 
    { 
        //Create the file streams to handle the input and output files. 
        FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read); 
        FileStream fout = new FileStream(outName, 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. 
     
        DES des = new DESCryptoServiceProvider(); 
        CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write); 
     
        //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(); 
 
}
using System;
using System.Security.Cryptography;//这个是处理文字编码的前提
using System.Text;
using System.IO;
/// <summary>
/// DES加密方法
/// </summary>
/// <param name="strPlain">明文</param>
/// <param name="strDESKey">密钥</param>
/// <param name="strDESIV">向量</param>
/// <returns>密文</returns>
public string DESEncrypt(string strPlain,string strDESKey,string strDESIV)
{
 //把密钥转换成字节数组
 byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
 //把向量转换成字节数组
 byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
 //声明1个新的DES对象
 DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider();
 //开辟一块内存流
 MemoryStream msEncrypt=new MemoryStream();
 //把内存流对象包装成加密流对象
 CryptoStream csEncrypt=new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);
 //把加密流对象包装成写入流对象
 StreamWriter swEncrypt=new StreamWriter(csEncrypt);
 //写入流对象写入明文
 swEncrypt.WriteLine(strPlain);
 //写入流关闭
 swEncrypt.Close();
 //加密流关闭
 csEncrypt.Close();
 //把内存流转换成字节数组，内存流现在已经是密文了
 byte[] bytesCipher=msEncrypt.ToArray();
 //内存流关闭
 msEncrypt.Close();
 //把密文字节数组转换为字符串，并返回
 return UnicodeEncoding.Unicode.GetString(bytesCipher);
}
 
 
 
 
/// <summary>
/// DES解密方法
/// </summary>
/// <param name="strCipher">密文</param>
/// <param name="strDESKey">密钥</param>
/// <param name="strDESIV">向量</param>
/// <returns>明文</returns>
public string DESDecrypt(string strCipher,string strDESKey,string strDESIV)
{
 //把密钥转换成字节数组
 byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
 //把向量转换成字节数组
 byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
 //把密文转换成字节数组
 byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher);
 //声明1个新的DES对象
 DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider();
 //开辟一块内存流，并存放密文字节数组
 MemoryStream msDecrypt=new MemoryStream(bytesCipher);
 //把内存流对象包装成解密流对象
 CryptoStream csDecrypt=new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);
 //把解密流对象包装成读出流对象
 StreamReader srDecrypt=new StreamReader(csDecrypt);
 //明文=读出流的读出内容
 string strPlainText=srDecrypt.ReadLine();
 //读出流关闭
 srDecrypt.Close();
 //解密流关闭
 csDecrypt.Close();
 //内存流关闭
 msDecrypt.Close();
 //返回明文
 return strPlainText;
}
简单加密基础


 　　　　static void Main(string[] args)
        {
            Console.WriteLine("请输入四位整数：");
            int i = int.Parse(Console.ReadLine());

            int first = i / 1000;
            int second = (i / 100) % 10;
            int third = (i / 10) % 10;
            int forth = i % 10;

            Console.WriteLine(first + " " + second + " " + third + " " + forth);

            first = (first + 7) % 10;
            second = (second + 7) % 10;
            third = (third + 7) % 10;
            forth = (forth + 7) % 10;

            int temp = third;
            third = first;
            first = temp;

            temp = forth;
            forth = second;
            second = temp;

            int pass = first * 1000 + second * 100 + third * 10 + forth;

            Console.WriteLine("Now is " + pass);
            Console.ReadLine();
        }

 1 private void btn_Encrypt_Click(object sender, EventArgs e)
 2         {
 3             int P_NumIn,P_CommonNum;
 4             //判断是否是数字
 5             if (int.TryParse(txtNumIn.Text, out P_NumIn) && int.TryParse(txtCommonNum.Text, out P_CommonNum))
 6             {
 7                 txtResult.Text = (P_NumIn ^ P_CommonNum).ToString();
 8                 txtReceive.Text = txtResult.Text;
 9             }
10             else
11             {
12                 MessageBox.Show("请输入数字","一点小插曲",MessageBoxButtons.RetryCancel,MessageBoxIcon.Error);
13             }
14         }
15 
16         private void btn_Revert_Click(object sender, EventArgs e)
17         {
18             int P_YouKnow;
19             if(int.TryParse(txtYouKnow.Text,out P_YouKnow))
20             {
21                 txtAnswer.Text = (P_YouKnow ^ (int.Parse(txtReceive.Text))).ToString();
22             }
23             else
24             {
25                 MessageBox.Show("请输入数字", "一点小插曲", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
26             }
27         }