C#加密算法汇总

12年前
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;  }