C# 加密算法汇总

2019年11月09日 阅读数:58
这篇文章主要向大家介绍C# 加密算法汇总,主要内容包括基础应用、实用技巧、原理机制等方面,希望对大家有所帮助。
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");;
     }
 
第二种(可逆加密算法)
  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>   
     /// 得到密钥   
     /// </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>   
     /// 得到初始向量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>通过加密的串</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>通过解密的串</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>