關(guān)于對(duì)稱加密的方法，我們之前了解過AES、REA等等，然后今天我們就來詳細(xì)的了解下壓縮加密解密解壓的一系列情況。

對(duì)稱加密：就是采用這種加密方法的雙方使用方式用同樣的密鑰進(jìn)行加密和解密。密鑰是控制加密及解密過程的指令。算法是一組規(guī)則，規(guī)定如何進(jìn)行加密和解密。

因此加密的安全性不僅取決于加密算法本身，密鑰管理的安全性更是重要。因?yàn)榧用芎徒饷芏际褂猛粋€(gè)密鑰，如何把密鑰安全地傳遞到解密者手上就成了必須要解決的問題。

由此可見密鑰傳遞也是比較重要的一環(huán)，一般都是通過對(duì)密鑰二次加密的方式，進(jìn)行密鑰的傳輸

加密實(shí)現(xiàn)代碼：

1. public?static?byte[]?encryptStringToBytes_AES(byte[]?fileContentBytes,?byte[]?Key,?byte[]?IV)
2. {
3. ????//?Check?arguments.
4. ????if?(fileContentBytes?==?null?||?fileContentBytes.Length?<=?0)
5. ????????throw?new?ArgumentNullException("plainText");
6. ????if?(Key?==?null?||?Key.Length?<=?0)
7. ????????throw?new?ArgumentNullException("Key");
8. ????if?(IV?==?null?||?IV.Length?<=?0)
9. ????????throw?new?ArgumentNullException("IV");
10. ????MemoryStream?msEncrypt?=?null;
11. ????AesCryptoServiceProvider?aesAlg?=?null;
12. ????try
13. ????{
14. ????????aesAlg?=?new?AesCryptoServiceProvider();
16. ????????aesAlg.Padding?=?PaddingMode.PKCS7;
17. ????????aesAlg.Key?=?Key;
18. ????????aesAlg.IV?=?IV;
20. ????????ICryptoTransform?encryptor?=?aesAlg.CreateEncryptor(aesAlg.Key,?aesAlg.IV);
22. ????????msEncrypt?=?new?MemoryStream();
23. ????????using?(CryptoStream?csEncrypt?=?new?CryptoStream(msEncrypt,?encryptor,?CryptoStreamMode.Write))
24. ????????{
25. ????????????csEncrypt.Write(fileContentBytes,?0,?fileContentBytes.Length);
26. ????????????csEncrypt.FlushFinalBlock();
27. ????????}
28. ????}
29. ????catch?(Exception?ex)
30. ????{
32. ????}
33. ????finally
34. ????{
35. ????????if?(aesAlg?!=?null)
36. ????????????aesAlg.Clear();
37. ????}
38. ????return?msEncrypt.ToArray();
39. }

解密代碼實(shí)現(xiàn)：

1. public?static?byte[]?decryptBytes(byte[]?cipherText,?byte[]?Key,?byte[]?IV)
2. {
3. ????if?(cipherText?==?null?||?cipherText.Length?<=?0)
4. ????????throw?new?ArgumentNullException("cipherText");
5. ????if?(Key?==?null?||?Key.Length?<=?0)
6. ????????throw?new?ArgumentNullException("Key");
7. ????if?(IV?==?null?||?IV.Length?<=?0)
8. ????????throw?new?ArgumentNullException("IV");
9. ????AesCryptoServiceProvider?aesAlg?=?null;
10. ????byte[]?buffer?=?null;
11. ????try
12. ????{
13. ????????using?(aesAlg?=?new?AesCryptoServiceProvider())
14. ????????{
15. ????????????aesAlg.Padding?=?PaddingMode.PKCS7;
16. ????????????aesAlg.Key?=?Key;
17. ????????????aesAlg.IV?=?IV;
18. ????????????ICryptoTransform?decryptor?=?aesAlg.CreateDecryptor(aesAlg.Key,?aesAlg.IV);
20. ????????????using?(MemoryStream?msDecrypt?=?new?MemoryStream(cipherText))
21. ????????????{
22. ????????????????CryptoStream?csDecrypt?=?new?CryptoStream(msDecrypt,?decryptor,?CryptoStreamMode.Read);
23. ????????????????byte[]?tempbuffer?=?new?byte[cipherText.Length];
24. ????????????????int?totalBytesRead?=?csDecrypt.Read(tempbuffer,?0,?tempbuffer.Length);
25. ????????????????buffer?=?tempbuffer.Take(totalBytesRead).ToArray();
26. ????????????}
27. ????????}
28. ????}
29. ????catch?(Exception?ex)
30. ????{
32. ????}
33. ????finally
34. ????{
35. ????????if?(aesAlg?!=?null)
36. ????????????aesAlg.Clear();
37. ????}
38. ????return?buffer;
39. }

客戶端加密解密文本文件實(shí)戰(zhàn)：

1. ///?<summary>
2. ///?加密解密
3. ///?</summary>
4. private?static?void?_EncryptAndDecrypt()
5. {
6. ????ASCIIEncoding?asciiEnc?=?new?ASCIIEncoding();
7. ????byte[]?initVectorBytes?=?asciiEnc.GetBytes("@1B2c3D4e5F6g7H8");
9. ????//Randomly?generate?or?Book?key?-?key?K2?-?Key?to?encrypt?xml?content
10. ????string?keyK2?=?Generator.RandomString(10);
11. ????//Generate?the?128?bit?string?using?MD5?for?key?K2
12. ????MD5?hashProvider?=?MD5.Create();
13. ????byte[]?md5EncryptedKeyK2?=?hashProvider.ComputeHash(asciiEnc.GetBytes(keyK2));
15. ????string?filename?=?"NewTextDocument.txt";
16. ????string?filepath?=?Environment.CurrentDirectory?+?"\\"?+?filename;
18. ????byte[]?Content?=?Encryption.encryptStringToBytes_AES(File.ReadAllBytes(filepath),?md5EncryptedKeyK2,?initVectorBytes);
19. ????string?encryptfilepath?=?Environment.CurrentDirectory?+?"\\encrypt"?+?filename;
20. ????File.WriteAllBytes(encryptfilepath,?Content);
22. ????byte[]?decryptContent?=?Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),?md5EncryptedKeyK2,?initVectorBytes);
23. ????string?decryptfilepath?=?Environment.CurrentDirectory?+?"\\decrypt"?+?filename;
24. ????File.WriteAllBytes(decryptfilepath,?decryptContent);
26. }

壓縮解壓：

1. string?filename?=?"NewTextDocument.txt";
2. string?filepath?=?Environment.CurrentDirectory?+?"\\"?+?filename;
3. string?zipfilepath?=?Environment.CurrentDirectory?+?"\\NewTextDocument.zip";
4. using?(ZipFile?contentZip?=?new?ZipFile())
5. {
6. ????//壓縮
7. ????contentZip.AlternateEncoding?=?Encoding.GetEncoding("iso-8859-1");
8. ????contentZip.AlternateEncodingUsage?=?ZipOption.Always;
9. ????ZipEntry?contentFile?=?contentZip.AddEntry(filename,?File.ReadAllBytes(filepath));
10. ????contentZip.Save(zipfilepath);
13. ????//解壓
14. ????contentZip.ExtractAll(Environment.CurrentDirectory);
15. }

壓縮加密解密解壓：

1. string?filename?=?"NewTextDocument.zip";
3. ???????????string?filepath?=?Environment.CurrentDirectory?+?"\\"?+?filename;
4. ???????????string?zipfilepath?=?Environment.CurrentDirectory?+?"\\"?+?filename;
6. ???????????ZipFile?contentZip?=?new?ZipFile();
8. ???????????contentZip.AlternateEncoding?=?Encoding.GetEncoding("iso-8859-1");
9. ???????????contentZip.AlternateEncodingUsage?=?ZipOption.Always;
10. ???????????var?bytecontent?=?File.ReadAllBytes(Environment.CurrentDirectory?+?"\\NewTextDocument.txt");
11. ???????????ZipEntry?contentFile?=?contentZip.AddEntry("NewTextDocument.txt",?bytecontent);
12. ???????????contentZip.Save(zipfilepath);
14. ???????????ASCIIEncoding?asciiEnc?=?new?ASCIIEncoding();
15. ???????????byte[]?initVectorBytes?=?asciiEnc.GetBytes("@1B2c3D4e5F6g7H8");
17. ???????????//Randomly?generate?or?Book?key?-?key?K2?-?Key?to?encrypt?xml?content
18. ???????????string?keyK2?=?Generator.RandomString(10);
19. ???????????//Generate?the?128?bit?string?using?MD5?for?key?K2
20. ???????????MD5?hashProvider?=?MD5.Create();
21. ???????????byte[]?md5EncryptedKeyK2?=?hashProvider.ComputeHash(asciiEnc.GetBytes(keyK2));
23. ???????????byte[]?Content?=?Encryption.encryptStringToBytes_AES(File.ReadAllBytes(filepath),?md5EncryptedKeyK2,?initVectorBytes);
24. ???????????string?encryptfilepath?=?Environment.CurrentDirectory?+?"\\encrypt"?+?filename;
25. ???????????File.WriteAllBytes(encryptfilepath,?Content);
27. ???????????byte[]?decryptContent?=?Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),?md5EncryptedKeyK2,?initVectorBytes);
28. ???????????string?decryptfilepath?=?Environment.CurrentDirectory?+?"\\decrypt"?+?filename;
29. ???????????File.WriteAllBytes(decryptfilepath,?decryptContent);
31. ???????????contentZip.ExtractAll(Environment.CurrentDirectory?+?"\\unzip\\decrypt");
32. ???????????string?key?=?Convert.ToBase64String(md5EncryptedKeyK2);
33. ???????????string?iv?=?Convert.ToBase64String(initVectorBytes);
34. ???????????Console.WriteLine(key);
35. ???????????Console.WriteLine(iv);
37. ???????????byte[]?decryptContent1?=?Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),?Convert.FromBase64String(key),?Convert.FromBase64String(iv));
38. ???????????string?decryptfilepath1?=?Environment.CurrentDirectory?+?"\\decrypt1"?+?filename;
40. ???????????contentZip.ExtractAll(Environment.CurrentDirectory?+?"\\unzip\\decrypt1");
42. ???????????File.WriteAllBytes(decryptfilepath1,?decryptContent1);

ice

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