AES对媒体文件的加密与解密

usingSystem.Text;

002	usingSystem.Collections;

003	usingSystem.ComponentModel;

004	usingSystem.Data;

005	usingSystem.Net;

006	usingSystem.Net.Sockets;

007	usingSystem.Threading;

008	usingSystem.IO;

009	usingSystem.Security.Cryptography;

010

011	publicclassAESEncryption

012

{

013

014	staticstringstrKey="dongbinhuiasxiny";//密钥,128位，也可以改为192位（24字节）或256位（32字节）。

015	staticvoidMain(string[] args)

016

{

017	RijndaelManaged rij =newRijndaelManaged();

018	rij.KeySize = 128;//指定密钥长度

019

020	stringfp =@"...";//待加密文件

021	stringsPhysicalFilePath =@"...";//加密后的文件

022	stringfw =@"...";//解密后的文件

023	Console.WriteLine("Encrypting begin...");

024	encryption(rij, fp, sPhysicalFilePath);

025	decryption(rij,sPhysicalFilePath,fw);

026

027

}

028

//用于加密的函数

029	publicstaticvoidencryption(RijndaelManaged rij,stringreadfile,stringwritefile)

030

{

031

try

032

{

033	//byte[] key = rij.Key;

034	byte[] key=Encoding.UTF8.GetBytes (strKey);

035	byte[] iv = rij.IV;

036	byte[] buffer =newbyte[4096];

037	Rijndael crypt = Rijndael.Create();

038	ICryptoTransform transform = crypt.CreateEncryptor(key, iv);

039

//写进文件

040	FileStream fswrite =newFileStream(writefile, FileMode.Create);

041	CryptoStream cs =newCryptoStream(fswrite, transform, CryptoStreamMode.Write);

042

//打开文件

043	FileStream fsread =newFileStream(readfile, FileMode.Open);

044

045	/*------------------定位要加密的部分-----------------*/

046	long_file_size=fsread.Length;

047	byte[] _header =newbyte[8];

048

//定位GUID

049	fsread.Seek(16, SeekOrigin.Begin);

050	//读取header size

051	fsread.Read(_header, 0, _header.Length);

052

//头部长度

053	long_header_size = (long)BitConverter.ToInt32(_header, 0);

054	byte[] _header_buffer=newbyte[_header_size];

055	fsread.Seek(0,SeekOrigin.Begin);

056	fsread.Read(_header_buffer,0,_header_buffer.Length);

057

//头部写入新文件

058	fswrite.Write(_header_buffer,0,_header_buffer.Length);

059	//定位到头部，准备读取需要加密的部分

060	fsread.Seek(_header_size,SeekOrigin.Begin);

061	/*-----------------定位加密部分完成-------------------*/

062	intlength;

063	//while ((length = fsread.ReadByte()) != -1)

064	//cs.WriteByte((byte)length);

065	while((length = fsread.Read(buffer, 0, 4096)) > 0){

066	cs.Write(buffer, 0, (int)length);

067

}

068

069	fsread.Close();

070	cs.Close();

071	fswrite.Close();

072	Console.WriteLine("Encrypt Success");

073

}

074	catch(Exception e)

075

{

076	Console.WriteLine("Encrypt Faile"+e.ToString());

077

}

078

}

079

//用于解密的函数

080	publicstaticvoiddecryption(RijndaelManaged rij,stringreadfile,stringwritefile)

081

{

082

try

083

{

084	//byte[] key = rij.Key;

085	byte[] key=Encoding.UTF8.GetBytes (strKey);

086	byte[] iv = rij.IV;

087	byte[] buffer=newbyte[4096];

088	Rijndael crypt = Rijndael.Create();

089	ICryptoTransform transform = crypt.CreateDecryptor(key, iv);

090	//读取加密后的文件

091	FileStream fsopen =newFileStream(readfile, FileMode.Open);

092	CryptoStream cs =newCryptoStream(fsopen, transform, CryptoStreamMode.Read);

093	//把解密后的结果写进文件

094	FileStream fswrite =newFileStream(writefile, FileMode.OpenOrCreate);

095	/*------------------定位要解密的部分-----------------*/

096	long_file_size=fsopen.Length;

097	byte[] _header =newbyte[8];

098

//定位GUID

099	fsopen.Seek(16, SeekOrigin.Begin);

100	//读取header size

101	fsopen.Read(_header, 0, _header.Length);

102

//头部长度

103	long_header_size = (long)BitConverter.ToInt32(_header, 0);

104	byte[] _header_buffer=newbyte[_header_size];

105	fsopen.Seek(0,SeekOrigin.Begin);

106	fsopen.Read(_header_buffer,0,_header_buffer.Length);

107

//头部写入新文件

108	fswrite.Write(_header_buffer,0,_header_buffer.Length);

109	//定位到头部，准备读取需要加密的部分

110	fsopen.Seek(_header_size,SeekOrigin.Begin);

111	/*-----------------定位要解密的部分完成-------------------*/

112

113	intlength;

114	//while ((length = cs.ReadByte()) != -1)

115	//fswrite.WriteByte((byte)length);

116	while((length = cs.Read(buffer, 0, 4096)) > 0){

117	fswrite.Write(buffer, 0, (int)length);

118

}

119	fswrite.Close();

120	cs.Close();

121	fsopen.Close();

122	Console.WriteLine("Decrypt Success");

123

}

124	catch(Exception e)

125

{

126	Console.WriteLine("Decrypt Failed"+e.ToString());

127

}

128

}

129

}

usingSystem;

002	usingSystem.IO;

003	usingSystem.Security;

004	usingSystem.Security.Cryptography;

005	usingSystem.Runtime.InteropServices;

006	usingSystem.Text;

007

008	namespaceCSEncryptDecrypt

009

{

010	classClass1

011

{

012	// Call this function to remove the key from memory after use for security

013	[System.Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint="RtlZeroMemory")]

014	publicstaticexternboolZeroMemory(IntPtr Destination,intLength);

015

016	// Function to Generate a 64 bits Key.

017	staticstringGenerateKey()

018

{

019	// Create an instance of Symetric Algorithm. Key and IV is generated automatically.

020	DESCryptoServiceProvider desCrypto =(DESCryptoServiceProvider)DESCryptoServiceProvider.Create();

021

022	// Use the Automatically generated key for Encryption.

023	returnASCIIEncoding.ASCII.GetString(desCrypto.Key);

024

}

025

026	staticvoidEncryptFile(stringsInputFilename,

027	stringsOutputFilename,

028	stringsKey)

029

{

030	FileStream fsInput =newFileStream(sInputFilename,

031	FileMode.Open,

032	FileAccess.Read);

033

034	FileStream fsEncrypted =newFileStream(sOutputFilename,

035	FileMode.Create,

036	FileAccess.Write);

037	DESCryptoServiceProvider DES =newDESCryptoServiceProvider();

038	DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

039	DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

040	ICryptoTransform desencrypt = DES.CreateEncryptor();

041	CryptoStream cryptostream =newCryptoStream(fsEncrypted,

042	desencrypt,

043	CryptoStreamMode.Write);

044

045	byte[] bytearrayinput =newbyte[fsInput.Length];

046	fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);

047	cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);

048	cryptostream.Close();

049	fsInput.Close();

050	fsEncrypted.Close();

051

}

052

053	staticvoidDecryptFile(stringsInputFilename,

054	stringsOutputFilename,

055	stringsKey)

056

{

057	DESCryptoServiceProvider DES =newDESCryptoServiceProvider();

058	//A 64 bit key and IV is required for this provider.

059	//Set secret key For DES algorithm.

060	DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

061	//Set initialization vector.

062	DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

063

064	//Create a file stream to read the encrypted file back.

065	FileStream fsread =newFileStream(sInputFilename,

066	FileMode.Open,

067	FileAccess.Read);

068	//Create a DES decryptor from the DES instance.

069	ICryptoTransform desdecrypt = DES.CreateDecryptor();

070	//Create crypto stream set to read and do a

071	//DES decryption transform on incoming bytes.

072	CryptoStream cryptostreamDecr =newCryptoStream(fsread,

073	desdecrypt,

074	CryptoStreamMode.Read);

075	//Print the contents of the decrypted file.

076	StreamWriter fsDecrypted =newStreamWriter(sOutputFilename);

077	fsDecrypted.Write(newStreamReader(cryptostreamDecr).ReadToEnd());

078	fsDecrypted.Flush();

079	fsDecrypted.Close();

080

}

081

082	staticvoidMain()

083

{

084	// Must be 64 bits, 8 bytes.

085	// Distribute this key to the user who will decrypt this file.

086	stringsSecretKey;

087

088	// Get the Key for the file to Encrypt.

089	sSecretKey = GenerateKey();

090

091	// For additional security Pin the key.

092	GCHandle gch = GCHandle.Alloc( sSecretKey,GCHandleType.Pinned );

093

094	// Encrypt the file.

095	EncryptFile(@"C:\MyData.txt",

096	@"C:\Encrypted.txt",

097	sSecretKey);

098

099	// Decrypt the file.

100	DecryptFile(@"C:\Encrypted.txt",

101	@"C:\Decrypted.txt",

102	sSecretKey);

103

104	// Remove the Key from memory.

105	ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2);

106	gch.Free();

107

}

108

}

109

}

[代码]大文件分块加密和解密

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01	usingSystem.Text;

02	usingSystem.Collections;

03	usingSystem.ComponentModel;

04	usingSystem.Data;

05	usingSystem.Net;

06	usingSystem.Net.Sockets;

07	usingSystem.Threading;

08	usingSystem.IO;

09	usingSystem.Security.Cryptography;

10

11	namespaceVideoEncrypt

12

{

13	classProgram

14

{

15	staticvoidMain(string[] args)

16

{

17	RijndaelManaged rij =newRijndaelManaged();

18	rij.KeySize = 128;

19

20	stringfp =@"E://friends//3//3.mkv";

21	stringsPhysicalFilePath =@"E://friends//3//o3.mkv";

22	stringfw =@"E://friends//3//dd3.mkv";

23	Console.WriteLine("Encrypting begin...");

24	encryption(rij, fp, sPhysicalFilePath);

25	decryption(rij,sPhysicalFilePath,fw);

26

27

}

28

//用于加密的函数

29	publicstaticvoidencryption(RijndaelManaged rij,stringreadfile,stringwritefile)

30

{

31

try

32

{

33	byte[] key = rij.Key;

34	byte[] iv = rij.IV;

35	byte[] buffer =newbyte[4096];

36	Rijndael crypt = Rijndael.Create();

37	ICryptoTransform transform = crypt.CreateEncryptor(key, iv);

38

//写进文件

39	FileStream fswrite =newFileStream(writefile, FileMode.Create);

40	CryptoStream cs =newCryptoStream(fswrite, transform, CryptoStreamMode.Write);

41

//打开文件

42	FileStream fsread =newFileStream(readfile, FileMode.Open);

43	intlength;

44	//while ((length = fsread.ReadByte()) != -1)

45	//cs.WriteByte((byte)length);

46	while((length = fsread.Read(buffer, 0, 4096)) > 0)

47	cs.Write(buffer, 0, (int)length);

48

49	fsread.Close();

50	cs.Close();

51	fswrite.Close();

52	Console.WriteLine("Encrypt Success");

53

}

54	catch(Exception e)

55

{

56	Console.WriteLine("Encrypt Faile"+e.ToString());

57

}

58

}

59

//用于解密的函数

60	publicstaticvoiddecryption(RijndaelManaged rij,stringreadfile,stringwritefile)

61

{

62

try

63

{

64	byte[] key = rij.Key;

65	byte[] iv = rij.IV;

66	byte[] buffer=newbyte[4096];

67	Rijndael crypt = Rijndael.Create();

68	ICryptoTransform transform = crypt.CreateDecryptor(key, iv);

69	//读取加密后的文件

70	FileStream fsopen =newFileStream(readfile, FileMode.Open);

71	CryptoStream cs =newCryptoStream(fsopen, transform, CryptoStreamMode.Read);

72	//把解密后的结果写进文件

73	FileStream fswrite =newFileStream(writefile, FileMode.OpenOrCreate);

74

75	intlength;

76	//while ((length = cs.ReadByte()) != -1)

77	//fswrite.WriteByte((byte)length);

78	while((length = cs.Read(buffer, 0, 4096)) > 0)

79	fswrite.Write(buffer, 0, (int)length);

80	fswrite.Close();

81	cs.Close();

82	fsopen.Close();

83	Console.WriteLine("Decrypt Success");

84

}

85	catch(Exception e)

86

{

87	Console.WriteLine("Decrypt Failed"+e.ToString());

88

}

89

}

90

}

91

}