C#加密解密算法汇总（转）

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;

}

 

本文转自：博客园（曾展祥 ）