DES加密算法加密大文件

usingSystem.Collections;

002	usingSystem.Configuration;

003	usingSystem.Data;

004	usingSystem.Linq;

005	usingSystem.Web;

006	usingSystem.Web.Security;

007	usingSystem.Web.UI;

008	usingSystem.Web.UI.HtmlControls;

009	usingSystem.Web.UI.WebControls;

010	usingSystem.Web.UI.WebControls.WebParts;

011	usingSystem.Xml.Linq;

012	usingSystem.Text;

013	usingSystem.IO;

014	usingSystem.Security.Cryptography;

015

016	publicpartialclassDefault2 : System.Web.UI.Page

017

{

018	protectedvoidPage_Load(objectsender, EventArgs e)

019

{

020

021

}

022	privatestaticbyte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//自定义密匙

023	privatestringfilePathA;//储存文件路径

024	privatestringfilePathB;//储存文件复制后的路径

025	/// <summary>

026

/// 文件加密

027	/// </summary>

028	/// <param name="inFile">文件储存路径</param>

029	/// <param name="outFile">储存文件复制的路径</param>

030	/// <param name="encryptKey"></param>

031	/// <returns></returns>

032	publicboolEncryptDES(stringinFile,stringoutFile,stringencryptKey)

033

{

034	byte[] rgb = Keys;

035

try

036

{

037	byte[] rgbKeys = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));

038	FileStream inFs =newFileStream(inFile, FileMode.Open, FileAccess.Read);//读入流

039	FileStream outFs =newFileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);// 等待写入流

040	outFs.SetLength(0);//帮助读写的变量

041	byte[] byteIn =newbyte[100];//放临时读入的流

042	longreadLen = 0;//读入流的长度

043	longtotalLen = inFs.Length;//读入流的总长度

044	inteverylen=0;//每次读入流的长度

045	DES des =newDESCryptoServiceProvider();//将inFile加密后放到outFile

046	CryptoStream encStream =newCryptoStream(outFs, des.CreateEncryptor(rgb, rgbKeys), CryptoStreamMode.Write);

047	while(readLen < totalLen)

048

{

049	everylen = inFs.Read(byteIn, 0, 100);

050	encStream.Write(byteIn, 0, everylen);

051	readLen = readLen + everylen;

052

}

053	encStream.Close();

054	inFs.Close();

055	outFs.Close();

056	returntrue;//加密成功

057

}

058	catch(Exception ex)

059

{

060	Response.Write(ex.Message.ToString());

061	returnfalse;//加密失败

062

}

063

}

064

065

066	publicboolDecryptDES(stringinFile,stringoutFile,stringencryptKey)

067

{

068	byte[] rgb = Keys;

069

try

070

{

071	byte[] rgbKeys = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));

072	FileStream inFs =newFileStream(inFile, FileMode.Open, FileAccess.Read);//读入流

073	FileStream outFs =newFileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write);// 等待写入流

074	outFs.SetLength(0);//帮助读写的变量

075	byte[] byteIn =newbyte[100];//放临时读入的流

076	longreadLen = 0;//读入流的长度

077	longtotalLen = inFs.Length;//读入流的总长度

078	inteverylen=0;//每次读入流的长度

079	DES des =newDESCryptoServiceProvider();//将inFile加密后放到outFile

080	CryptoStream encStream =newCryptoStream(outFs, des.CreateDecryptor(rgb, rgbKeys), CryptoStreamMode.Write);

081	while(readLen < totalLen)

082

{

083	everylen = inFs.Read(byteIn, 0, 100);

084	encStream.Write(byteIn, 0, everylen);

085	readLen = readLen + everylen;

086

}

087	encStream.Close();

088	inFs.Close();

089	outFs.Close();

090	returntrue;//加密成功

091

}

092	catch(Exception ex)

093

{

094	Response.Write(ex.Message.ToString());

095	returnfalse;//加密失败

096

}

097

}

098	/// <summary>

099

/// 拷贝文件

100	/// </summary>

101	publicvoidcopyFile()

102

{

103	filePathA =this.fei.PostedFile.FileName;//获取文件全部路径

104	stringfileName =this.fei.FileName;

105	stringpath = System.IO.Path.GetDirectoryName(filePathA);

106	filePathB = path +"\\1"+ fileName;//重新设置文件名

107	File.Copy(filePathA, filePathB);

108

}

109

110	protectedvoidbtnOK_Click(objectsender, EventArgs e)

111

{

112	copyFile();

113	if(EncryptDES(filePathB, filePathA,"mingrisoft"))

114

{

115	RegisterStartupScript("false","<script>alert('加密成功!\\n');</script>");

116

}

117

else

118

{

119	RegisterStartupScript("false","<script>alert('失败成功!\\n');</script>");

120

}

121	File.Delete(filePathB);

122

}

123	protectedvoidbtnCancel_Click(objectsender, EventArgs e)

124

{

125	copyFile();

126	if(DecryptDES(filePathB, filePathA,"mingrisoft"))

127

{

128	RegisterStartupScript("false","<script>alert('加密成功!\\n');</script>");

129

}

130

else

131

{

132	RegisterStartupScript("false","<script>alert('失败成功!\\n');</script>");

133

}

134	File.Delete(filePathB);

135

}

136

}

01	/**********************************************************

02	* CJF Development Library for Microsoft.NET

03	* Note：DES加密解密字符串

04	* Create Date：2011-11-15

05	* Author：崔俊峰

06	* Copyright (c) 2012,2015 Cjf Studio.China

07	* All Rigths Reserved!

08	**********************************************************/

09

10	usingSystem;

11	usingSystem.IO;

12	usingSystem.Text;

13	usingSystem.Security.Cryptography;

14

15	namespaceCjf.Components.Security

16

{

17	/// <summary>

18	/// DES加密解密字符串

19	/// </summary>

20	publicclassDesEncryption

21

{

22

//默认密钥向量

23	privatestaticbyte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

24

25	/// <summary>

26	/// DES加密字符串

27	/// </summary>

28	/// <param name="encryptString">待加密的字符串</param>

29	/// <param name="encryptKey">加密密钥,要求为8位</param>

30	/// <returns>加密成功返回加密后的字符串，失败返回null</returns>

31	publicstaticstringEncryptDES(stringencryptString,stringencryptKey ="11001100")

32

{

33

try

34

{

35	byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));

36	byte[] rgbIV = Keys;

37	byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);

38	DESCryptoServiceProvider dCSP =newDESCryptoServiceProvider();

39	MemoryStream mStream =newMemoryStream();

40	CryptoStream cStream =newCryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

41	cStream.Write(inputByteArray, 0, inputByteArray.Length);

42	cStream.FlushFinalBlock();

43	returnConvert.ToBase64String(mStream.ToArray());

44

}

45

catch

46

{

47	returnnull;

48

}

49

}

50

51	/// <summary>

52	/// DES解密字符串

53	/// </summary>

54	/// <param name="decryptString">待解密的字符串</param>

55	/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>

56	/// <returns>解密成功返回解密后的字符串，失败返回null</returns>

57	publicstaticstringDecryptDES(stringdecryptString,stringdecryptKey ="11001100")

58

{

59

try

60

{

61	byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);

62	byte[] rgbIV = Keys;

63	byte[] inputByteArray = Convert.FromBase64String(decryptString);

64	DESCryptoServiceProvider DCSP =newDESCryptoServiceProvider();

65	MemoryStream mStream =newMemoryStream();

66	CryptoStream cStream =newCryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

67	cStream.Write(inputByteArray, 0, inputByteArray.Length);

68	cStream.FlushFinalBlock();

69	returnEncoding.UTF8.GetString(mStream.ToArray());

70

}

71

catch

72

{

73	returnnull;

74

}

75

}

76

}

77

}