C#加密算法汇总

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;

}