对称加密之AES及压缩加密解密解压综合实战

对称加密：就是采用这种加密方法的双方使用方式用同样的密钥进行加密和解密。密钥是控制加密及解密过程的指令。算法是一组规则，规定如何进行加密和解密。

因此加密的安全性不仅取决于加密算法本身，密钥管理的安全性更是重要。因为加密和解密都使用同一个密钥，如何把密钥安全地传递到解密者手上就成了必须要解决的问题。

由此可见密钥传递也是比较重要的一环，一般都是通过对密钥二次加密的方式，进行密钥的传输

加密实现代码：

publicstaticbyte[]encryptStringToBytes_AES(byte[]fileContentBytes,byte[]Key,byte[]IV) 
{ 
//Checkarguments. 
if(fileContentBytes==null||fileContentBytes.Length<=0) 
thrownewArgumentNullException("plainText"); 
if(Key==null||Key.Length<=0) 
thrownewArgumentNullException("Key"); 
if(IV==null||IV.Length<=0) 
thrownewArgumentNullException("IV"); 
MemoryStreammsEncrypt=null; 
AesCryptoServiceProvideraesAlg=null; 
try 
{ 
aesAlg=newAesCryptoServiceProvider(); 
 
aesAlg.Padding=PaddingMode.PKCS7; 
aesAlg.Key=Key; 
aesAlg.IV=IV; 
 
ICryptoTransformencryptor=aesAlg.CreateEncryptor(aesAlg.Key,aesAlg.IV); 
 
msEncrypt=newMemoryStream(); 
using(CryptoStreamcsEncrypt=newCryptoStream(msEncrypt,encryptor,CryptoStreamMode.Write)) 
{ 
csEncrypt.Write(fileContentBytes,0,fileContentBytes.Length); 
csEncrypt.FlushFinalBlock(); 
} 
} 
catch(Exceptionex) 
{ 
 
} 
finally 
{ 
if(aesAlg!=null) 
aesAlg.Clear(); 
} 
returnmsEncrypt.ToArray(); 
}

解密代码实现：

publicstaticbyte[]decryptBytes(byte[]cipherText,byte[]Key,byte[]IV) 
{ 
if(cipherText==null||cipherText.Length<=0) 
thrownewArgumentNullException("cipherText"); 
if(Key==null||Key.Length<=0) 
thrownewArgumentNullException("Key"); 
if(IV==null||IV.Length<=0) 
thrownewArgumentNullException("IV"); 
AesCryptoServiceProvideraesAlg=null; 
byte[]buffer=null; 
try 
{ 
using(aesAlg=newAesCryptoServiceProvider()) 
{ 
aesAlg.Padding=PaddingMode.PKCS7; 
aesAlg.Key=Key; 
aesAlg.IV=IV; 
ICryptoTransformdecryptor=aesAlg.CreateDecryptor(aesAlg.Key,aesAlg.IV); 
 
using(MemoryStreammsDecrypt=newMemoryStream(cipherText)) 
{ 
CryptoStreamcsDecrypt=newCryptoStream(msDecrypt,decryptor,CryptoStreamMode.Read); 
byte[]tempbuffer=newbyte[cipherText.Length]; 
inttotalBytesRead=csDecrypt.Read(tempbuffer,0,tempbuffer.Length); 
buffer=tempbuffer.Take(totalBytesRead).ToArray(); 
} 
} 
} 
catch(Exceptionex) 
{ 
 
} 
finally 
{ 
if(aesAlg!=null) 
aesAlg.Clear(); 
} 
returnbuffer; 
}

客户端加密解密文本文件实战：

///<summary>
///加密解密 
///</summary>
privatestaticvoid_EncryptAndDecrypt() 
{ 
ASCIIEncodingasciiEnc=newASCIIEncoding(); 
byte[]initVectorBytes=asciiEnc.GetBytes("@1B2c3D4e5F6g7H8"); 
 
//RandomlygenerateorBookkey-keyK2-Keytoencryptxmlcontent 
stringkeyK2=Generator.RandomString(10); 
//Generatethe128bitstringusingMD5forkeyK2 
MD5hashProvider=MD5.Create(); 
byte[]md5EncryptedKeyK2=hashProvider.ComputeHash(asciiEnc.GetBytes(keyK2)); 
 
stringfilename="NewTextDocument.txt"; 
stringfilepath=Environment.CurrentDirectory+"\\"+filename; 
 
byte[]Content=Encryption.encryptStringToBytes_AES(File.ReadAllBytes(filepath),md5EncryptedKeyK2,initVectorBytes); 
stringencryptfilepath=Environment.CurrentDirectory+"\\encrypt"+filename; 
File.WriteAllBytes(encryptfilepath,Content); 
 
byte[]decryptContent=Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),md5EncryptedKeyK2,initVectorBytes); 
stringdecryptfilepath=Environment.CurrentDirectory+"\\decrypt"+filename; 
File.WriteAllBytes(decryptfilepath,decryptContent); 
 
}

压缩解压：

stringfilename="NewTextDocument.txt"; 
stringfilepath=Environment.CurrentDirectory+"\\"+filename; 
stringzipfilepath=Environment.CurrentDirectory+"\\NewTextDocument.zip"; 
using(ZipFilecontentZip=newZipFile()) 
{ 
//压缩 
contentZip.AlternateEncoding=Encoding.GetEncoding("iso-8859-1"); 
contentZip.AlternateEncodingUsage=ZipOption.Always; 
ZipEntrycontentFile=contentZip.AddEntry(filename,File.ReadAllBytes(filepath)); 
contentZip.Save(zipfilepath); 
 
 
//解压 
contentZip.ExtractAll(Environment.CurrentDirectory); 
}

压缩加密解密解压：

stringfilename="NewTextDocument.zip"; 
 
stringfilepath=Environment.CurrentDirectory+"\\"+filename; 
stringzipfilepath=Environment.CurrentDirectory+"\\"+filename; 
 
ZipFilecontentZip=newZipFile(); 
 
contentZip.AlternateEncoding=Encoding.GetEncoding("iso-8859-1"); 
contentZip.AlternateEncodingUsage=ZipOption.Always; 
varbytecontent=File.ReadAllBytes(Environment.CurrentDirectory+"\\NewTextDocument.txt"); 
ZipEntrycontentFile=contentZip.AddEntry("NewTextDocument.txt",bytecontent); 
contentZip.Save(zipfilepath); 
 
ASCIIEncodingasciiEnc=newASCIIEncoding(); 
byte[]initVectorBytes=asciiEnc.GetBytes("@1B2c3D4e5F6g7H8"); 
 
//RandomlygenerateorBookkey-keyK2-Keytoencryptxmlcontent 
stringkeyK2=Generator.RandomString(10); 
//Generatethe128bitstringusingMD5forkeyK2 
MD5hashProvider=MD5.Create(); 
byte[]md5EncryptedKeyK2=hashProvider.ComputeHash(asciiEnc.GetBytes(keyK2)); 
 
byte[]Content=Encryption.encryptStringToBytes_AES(File.ReadAllBytes(filepath),md5EncryptedKeyK2,initVectorBytes); 
stringencryptfilepath=Environment.CurrentDirectory+"\\encrypt"+filename; 
File.WriteAllBytes(encryptfilepath,Content); 
 
byte[]decryptContent=Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),md5EncryptedKeyK2,initVectorBytes); 
stringdecryptfilepath=Environment.CurrentDirectory+"\\decrypt"+filename; 
File.WriteAllBytes(decryptfilepath,decryptContent); 
 
contentZip.ExtractAll(Environment.CurrentDirectory+"\\unzip\\decrypt"); 
stringkey=Convert.ToBase64String(md5EncryptedKeyK2); 
stringiv=Convert.ToBase64String(initVectorBytes); 
Console.WriteLine(key); 
Console.WriteLine(iv); 
 
byte[]decryptContent1=Encryption.decryptBytes(File.ReadAllBytes(encryptfilepath),Convert.FromBase64String(key),Convert.FromBase64String(iv)); 
stringdecryptfilepath1=Environment.CurrentDirectory+"\\decrypt1"+filename; 
 
contentZip.ExtractAll(Environment.CurrentDirectory+"\\unzip\\decrypt1"); 
 
File.WriteAllBytes(decryptfilepath1,decryptContent1);