.NET 加密 通用代码(c#)

方法一 (不可逆加密) 

public   string  EncryptPassword( string  PasswordString, string  PasswordFormat ) 
    ... { 
   string  encryptPassword = null;
   if (PasswordFormat="SHA1")...{ 
   encryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString ,"SHA1"); 
   } 
   elseif (PasswordFormat="MD5") 
   ...{ encryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString ,"MD5"); 
   }
return encryptPassword ;
}

 

2、方法二 (可逆加密)

 

     public   interface  IBindesh
... {
    string encode(string str);
    string decode(string str);
}

public   class  EncryptionDecryption : IBindesh
     ... {
        public string encode(string str)
        ...{
            string htext = ""; 

            for ( int i = 0; i < str.Length; i++)
            ...{
                htext = htext + (char) (str[i] + 10 - 1 * 2);
            }
            return htext;
        }

        public string decode(string str)
        ...{
            string dtext = ""; 

            for ( int i=0; i < str.Length; i++)
            ...{
                dtext = dtext + (char) (str[i] - 10 + 1*2);
            }
            return dtext;
        }

 

3、方法三 (可逆加密)

 

        
         const   string  KEY_64  =   " VavicApp " ; // 注意了，是8个字符，64位

         const   string  IV_64  =   " VavicApp " ; 
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();
        }

 

4、MD5不可逆加密

    (32位加密)

public   string  GetMD5( string  s,  string  _input_charset)
     ... {

        /**//// 

        /// 与ASP兼容的MD5加密算法
        /// 

        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  GetMd5Str( string  ConvertString)
     ... {
        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
        string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
        t2 = t2.Replace("-", "");
        return t2;
    }  

 

5、加解文本文件

 

     // 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();
    }

 

6、

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.Security.Cryptography;
using  System.IO;

namespace  Component
... {
    public class Security
    ...{
        public Security()
        ...{ 
        
        }

        //默认密钥向量
        private static byte[] Keys = ...{ 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        /**//**//**//// 

        /// DES加密字符串
        /// 

        /// 待加密的字符串
        /// 加密密钥,要求为8位
        /// 加密成功返回加密后的字符串，失败返回源串
        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;
            }
        }

        /**//**//**//// 

        /// DES解密字符串
        /// 

        /// 待解密的字符串
        /// 解密密钥,要求为8位,和加密密钥相同
        /// 解密成功返回解密后的字符串，失败返源串
        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;
            }
        } 


    }
}