知识大全 DOTNET的加密技术应用

Posted 2022-07-18 文件

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　　using System;using System Text;using System Security;using System Security Cryptography;using System IO;namespace EncryptClasses /// <summary> /// 此处定义的是DES加密为了便于今后的管理和维护 /// 请不要随便改动密码或者改变了密码后请一定要 /// 牢记先前的密码否则将会照成不可预料的损失 /// </summary> public class DESEncrypt #region member fields private string iv= ; private string key= ; private Encoding encoding=new UnicodeEncoding(); private DES des; #endregion /// <summary> /// 构造函数 /// </summary> public DESEncrypt() des=new DESCryptoServiceProvider(); #region propertys /// <summary> /// 设置加密密钥 /// </summary> public string EncryptKey getreturn this key; set this key=value; /// <summary> /// 要加密字符的编码模式 /// </summary> public Encoding EncodingMode getreturn this encoding; setthis encoding=value; #endregion #region methods /// <summary> /// 加密字符串并返回加密后的结果 /// </summary> /// <param name= str ></param> /// <returns></returns> public string EncryptString(string str) byte[] ivb=Encoding ASCII GetBytes(this iv); byte[] keyb=Encoding ASCII GetBytes(this EncryptKey);//得到加密密钥 byte[] toEncrypt=this EncodingMode GetBytes(str);//得到要加密的内容 byte[] encrypted; ICryptoTransform encryptor=des CreateEncryptor(keyb ivb); MemoryStream msEncrypt=new MemoryStream(); CryptoStream csEncrypt=new CryptoStream(msEncrypt encryptor CryptoStreamMode Write); csEncrypt Write(toEncrypt toEncrypt Length); csEncrypt FlushFinalBlock(); encrypted=msEncrypt ToArray(); csEncrypt Close(); msEncrypt Close(); return this EncodingMode GetString(encrypted); /// <summary> /// 加密指定的文件如果成功返回True 否则false /// </summary> /// <param name= filePath >要加密的文件路径</param> /// <param name= outPath >加密后的文件输出路径</param> public void EncryptFile(string filePath string outPath) bool isExist=File Exists(filePath); if(isExist)//如果存在 byte[] ivb=Encoding ASCII GetBytes(this iv); byte[] keyb=Encoding ASCII GetBytes(this EncryptKey); //得到要加密文件的字节流 FileStream fin=new FileStream(filePath FileMode Open FileAccess Read); StreamReader reader=new StreamReader(fin this EncodingMode); string dataStr=reader ReadToEnd(); byte[] toEncrypt=this EncodingMode GetBytes(dataStr); fin Close();

　　FileStream fout=new FileStream(outPath FileMode Create FileAccess Write); ICryptoTransform encryptor=des CreateEncryptor(keyb ivb); CryptoStream csEncrypt=new CryptoStream(fout encryptor CryptoStreamMode Write); try //加密得到的文件字节流 csEncrypt Write(toEncrypt toEncrypt Length); csEncrypt FlushFinalBlock(); catch(Exception err) throw new ApplicationException(err Message); finally try fout Close(); csEncrypt Close(); catch ; else throw new FileNotFoundException( 没有找到指定的文件 ); /// <summary> /// 文件加密函数的重载版本如果不指定输出路径 /// 那么原来的文件将被加密后的文件覆蓋 /// </summary> /// <param name= filePath ></param> public void EncryptFile(string filePath) this EncryptFile(filePath filePath);

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