c#經過DES加密算法加密大文件的辦法。本站提示廣大學習愛好者:(c#經過DES加密算法加密大文件的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是c#經過DES加密算法加密大文件的辦法正文
本文實例講述了c#經過DES加密算法加密大文件的辦法。分享給大家供大家參考。詳細完成辦法如下:
using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Text; using System.IO; using System.Security.Cryptography; public partial class Default2 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//自定義密匙 private string filePathA;//貯存文件途徑 private string filePathB;//貯存文件復制後的途徑 /// <summary> /// 文件加密 /// </summary> /// <param name="inFile">文件貯存途徑</param> /// <param name="outFile">貯存文件復制的途徑</param> /// <param name="encryptKey"></param> /// <returns></returns> public bool EncryptDES(string inFile, string outFile, string encryptKey) { byte[] rgb = Keys; try { byte[] rgbKeys = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); FileStream inFs = new FileStream(inFile, FileMode.Open, FileAccess.Read);//讀入流 FileStream outFs = new FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);// 等候寫入流 outFs.SetLength(0);//協助讀寫的變量 byte[] byteIn = new byte[100];//放暫時讀入的流 long readLen = 0;//讀入流的長度 long totalLen = inFs.Length;//讀入流的總長度 int everylen=0;//每次讀入流的長度 DES des = new DESCryptoServiceProvider();//將inFile加密後放到outFile CryptoStream encStream = new CryptoStream(outFs, des.CreateEncryptor(rgb, rgbKeys), CryptoStreamMode.Write); while (readLen < totalLen) { everylen = inFs.Read(byteIn, 0, 100); encStream.Write(byteIn, 0, everylen); readLen = readLen + everylen; } encStream.Close(); inFs.Close(); outFs.Close(); return true;//加密成功 } catch (Exception ex) { Response.Write(ex.Message.ToString()); return false;//加密失敗 } } public bool DecryptDES(string inFile, string outFile, string encryptKey) { byte[] rgb = Keys; try { byte[] rgbKeys = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); FileStream inFs = new FileStream(inFile, FileMode.Open, FileAccess.Read);//讀入流 FileStream outFs = new FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);// 等候寫入流 outFs.SetLength(0);//協助讀寫的變量 byte[] byteIn = new byte[100];//放暫時讀入的流 long readLen = 0;//讀入流的長度 long totalLen = inFs.Length;//讀入流的總長度 int everylen=0;//每次讀入流的長度 DES des = new DESCryptoServiceProvider();//將inFile加密後放到outFile CryptoStream encStream = new CryptoStream(outFs, des.CreateDecryptor(rgb, rgbKeys), CryptoStreamMode.Write); while (readLen < totalLen) { everylen = inFs.Read(byteIn, 0, 100); encStream.Write(byteIn, 0, everylen); readLen = readLen + everylen; } encStream.Close(); inFs.Close(); outFs.Close(); return true;//加密成功 } catch (Exception ex) { Response.Write(ex.Message.ToString()); return false;//加密失敗 } } /// <summary> /// 拷貝文件 /// </summary> public void copyFile() { filePathA = this.fei.PostedFile.FileName;//獲取文件全部途徑 string fileName = this.fei.FileName; string path = System.IO.Path.GetDirectoryName(filePathA); filePathB = path + "\\1" + fileName;//重新設置文件名 File.Copy(filePathA, filePathB); } protected void btnOK_Click(object sender, EventArgs e) { copyFile(); if (EncryptDES(filePathB, filePathA, "mingrisoft")) { RegisterStartupScript("false", "<script>alert('加密成功!\\n');</script>"); } else { RegisterStartupScript("false", "<script>alert('失敗成功!\\n');</script>"); } File.Delete(filePathB); } protected void btnCancel_Click(object sender, EventArgs e) { copyFile(); if (DecryptDES(filePathB, filePathA, "mingrisoft")) { RegisterStartupScript("false", "<script>alert('加密成功!\\n');</script>"); } else { RegisterStartupScript("false", "<script>alert('失敗成功!\\n');</script>"); } File.Delete(filePathB); } }
希望本文所述對大家的C#順序設計有所協助。