C#加密算法汇总

 

方法一：

    //须添加对System.Web的引用

    usingSystem.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>

    publicstringSHA1(stringsource)

    {

        returnFormsAuthentication.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>

    publicstringMD5(stringsource)

    {

        returnFormsAuthentication.HashPasswordForStoringInConfigFile(source,"MD5");;

    }

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方法二(可逆加密解密)：

    usingSystem.Security.Cryptography;

   

    ...

   

    publicstringEncode(stringdata)

    {

        byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);

        byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

   

        DESCryptoServiceProvider cryptoProvider =newDESCryptoServiceProvider();

        inti = cryptoProvider.KeySize;

        MemoryStream ms =newMemoryStream();

        CryptoStream cst =newCryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

   

        StreamWriter sw =newStreamWriter(cst);

        sw.Write(data);

        sw.Flush();

        cst.FlushFinalBlock();

        sw.Flush();

        returnConvert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);

   

    }

   

    publicstringDecode(stringdata)

    {

        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 =newDESCryptoServiceProvider();

        MemoryStream ms =newMemoryStream(byEnc);

        CryptoStream cst =newCryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);

        StreamReader sr =newStreamReader(cst);

        returnsr.ReadToEnd();

    }

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方法三(MD5不可逆)：

    usingSystem.Security.Cryptography;

   

    ...

   

    //MD5不可逆加密

   

    //32位加密

   

    publicstringGetMD5_32(strings,string _input_charset)

    {

        MD5 md5 =newMD5CryptoServiceProvider();

        byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));

        StringBuilder sb =newStringBuilder(32);

        for(inti = 0; i < t.Length; i++)

        {

            sb.Append(t[i].ToString("x").PadLeft(2,'0'));

        }

        returnsb.ToString();

    }

   

    //16位加密

    publicstaticstring GetMd5_16(stringConvertString)

    {

        MD5CryptoServiceProvider md5 =newMD5CryptoServiceProvider();

        stringt2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);

        t2 = t2.Replace("-","");

        returnt2;

    }

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方法四(对称加密)：

    usingSystem.IO;

    usingSystem.Security.Cryptography;

   

    ...

   

    privateSymmetricAlgorithm mobjCryptoService;

    privatestringKey;

    /// <summary>   

    /// 对称加密类的构造函数   

    /// </summary>   

    publicSymmetricMethod()

    {

        mobjCryptoService =newRijndaelManaged();

        Key ="Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";

    }

    /// <summary>   

    /// 获得密钥   

    /// </summary>   

    /// <returns>密钥</returns>   

    privatebyte[] GetLegalKey()

    {

        stringsTemp = Key;

        mobjCryptoService.GenerateKey();

        byte[] bytTemp = mobjCryptoService.Key;

        intKeyLength = bytTemp.Length;

        if(sTemp.Length > KeyLength)

            sTemp = sTemp.Substring(0, KeyLength);

        elseif(sTemp.Length < KeyLength)

            sTemp = sTemp.PadRight(KeyLength, ' ');

        returnASCIIEncoding.ASCII.GetBytes(sTemp);

    }

    /// <summary>   

    /// 获得初始向量IV   

    /// </summary>   

    /// <returns>初试向量IV</returns>   

    privatebyte[] GetLegalIV()

    {

        stringsTemp ="E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";

        mobjCryptoService.GenerateIV();

        byte[] bytTemp = mobjCryptoService.IV;

        intIVLength = bytTemp.Length;

        if(sTemp.Length > IVLength)

            sTemp = sTemp.Substring(0, IVLength);

        elseif(sTemp.Length < IVLength)

            sTemp = sTemp.PadRight(IVLength, ' ');

        returnASCIIEncoding.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>   

    publicstringEncrypto(stringSource)

    {

        byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);

        MemoryStream ms =newMemoryStream();

        mobjCryptoService.Key = GetLegalKey();

        mobjCryptoService.IV = GetLegalIV();

        ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();

        CryptoStream cs =newCryptoStream(ms, encrypto, CryptoStreamMode.Write);

        cs.Write(bytIn, 0, bytIn.Length);

        cs.FlushFinalBlock();

        ms.Close();

        byte[] bytOut = ms.ToArray();

        returnConvert.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>   

    publicstringDecrypto(stringSource)

    {

        byte[] bytIn = Convert.FromBase64String(Source);

        MemoryStream ms =newMemoryStream(bytIn, 0, bytIn.Length);

        mobjCryptoService.Key = GetLegalKey();

        mobjCryptoService.IV = GetLegalIV();

        ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();

        CryptoStream cs =newCryptoStream(ms, encrypto, CryptoStreamMode.Read);

        StreamReader sr =newStreamReader(cs);

        returnsr.ReadToEnd();

    }

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方法五：

    usingSystem.IO;

    usingSystem.Security.Cryptography;

    usingSystem.Text;

   

    ...

   

    //默认密钥向量

    privatestaticbyte[] 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>

    publicstaticstring EncryptDES(stringencryptString,stringencryptKey)

    {

        try

        {

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

            byte[] rgbIV = Keys;

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

            DESCryptoServiceProvider dCSP = newDESCryptoServiceProvider();

            MemoryStream mStream = newMemoryStream();

            CryptoStream cStream = newCryptoStream(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>

    publicstaticstring DecryptDES(stringdecryptString,stringdecryptKey)

    {

        try

        {

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

            byte[] rgbIV = Keys;

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

            DESCryptoServiceProvider DCSP = newDESCryptoServiceProvider();

            MemoryStream mStream = newMemoryStream();

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

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

            cStream.FlushFinalBlock();

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

        }

        catch

        {

            return decryptString;

        }

    }

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方法六(文件加密)：

    usingSystem.IO;

    usingSystem.Security.Cryptography;

    usingSystem.Text;

   

    ...

   

    //加密文件

    privatestaticvoid EncryptData(String inName, String outName,byte[] desKey,byte[] desIV)

    {

        //Create the file streams to handle the input and output files.

        FileStream fin =newFileStream(inName, FileMode.Open, FileAccess.Read);

        FileStream fout =newFileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);

        fout.SetLength(0);

   

        //Create variables to help with read and write.

        byte[] bin =newbyte[100];//This is intermediate storage for the encryption.

        longrdlen = 0;             //This is the total number of bytes written.

        longtotlen = fin.Length;   //This is the total length of the input file.

        intlen;                    //This is the number of bytes to be written at a time.

   

        DES des =newDESCryptoServiceProvider();

        CryptoStream encStream =newCryptoStream(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

    privatestaticvoid DecryptData(String inName, String outName,byte[] desKey,byte[] desIV)

    {

        //Create the file streams to handle the input and output files.

        FileStream fin =newFileStream(inName, FileMode.Open, FileAccess.Read);

        FileStream fout =newFileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);

        fout.SetLength(0);

   

        //Create variables to help with read and write.

        byte[] bin =newbyte[100];//This is intermediate storage for the encryption.

        longrdlen = 0;             //This is the total number of bytes written.

        longtotlen = fin.Length;   //This is the total length of the input file.

        intlen;                    //This is the number of bytes to be written at a time.

   

        DES des =newDESCryptoServiceProvider();

        CryptoStream encStream =newCryptoStream(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();

}

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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(stringstrPlain,stringstrDESKey,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=newDESCryptoServiceProvider();

//开辟一块内存流

MemoryStream msEncrypt=newMemoryStream();

//把内存流对象包装成加密流对象

CryptoStream csEncrypt=newCryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);

//把加密流对象包装成写入流对象

StreamWriter swEncrypt=newStreamWriter(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

returnUnicodeEncoding.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(stringstrCipher,stringstrDESKey,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=newDESCryptoServiceProvider();

//开辟一块内存流，并存放密文字节数组

MemoryStream msDecrypt=newMemoryStream(bytesCipher);

//把内存流对象包装成解密流对象

CryptoStream csDecrypt=newCryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);

//把解密流对象包装成读出流对象

StreamReader srDecrypt=newStreamReader(csDecrypt);

//明文=读出流的读出内容

stringstrPlainText=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

returnstrPlainText;

}

 

作者：曾祥展

出处：学无止境-博客园 （http://www.cnblogs.com/zengxiangzhan/）

原文地址：http://www.cnblogs.com/zengxiangzhan/archive/2010/01/30/1659687.html