关于Data Protection API (非托管加密类)的练习

Data Protection API 简称 DPAPI 是非托管 集成于Windows系统中的一个数据保护类,下面是ProtectedData类和ProtectedMemory类的练习..

 

//Get User Input Data's

String Input=Console.ReadLine();

 

//Change Input Data  to Bytes

Byte[] DataToEncryp=encoding.UTF8.GetBytes(Input);

 

//Defination The Keys

Byte[] Keys=new Byte[]{0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x40};

 

//Implementation of the Cryptographic Service

Byte[] EncryptData=ProtectedData.Protecd(DataToEncryp,Keys,DataProtectionScope.CurrentUser);

 

//OutPut Encrypted Content

Console.WriteLine(Convert.ToBase64String(EncryptData));

 

下面时ProtectedMemory的实例代码

 

Byte[] DatatoEncrypted = Encoding.UTF8.GetBytes(Console.ReadLine()); //Because The ProtectedMemory API Only Supports 16-Byte Array of Multiple,So The Data Need to block cipher Int32 count = DatatoEncrypted.Length % 16 == 0 ? DatatoEncrypted.Length / 16 : DatatoEncrypted.Length / 16 + 1; Int32 DataLeng=DatatoEncrypted.Length; List<Byte> Bytelist = new List<byte>(); for (int i = 0; i < count; i++) { int j=16; if (DataLeng < 16) j = DataLeng; Byte[] TemplateArr=new Byte[16]; Array.Copy(DatatoEncrypted, i * j, TemplateArr, 0, j); for (int k = 0; k < TemplateArr.Length; k++) if (TemplateArr[k].ToString()=="0") { TemplateArr[k] = 0032; } ProtectedMemory.Protect(TemplateArr, MemoryProtectionScope.SameLogon); Bytelist.AddRange(TemplateArr); DataLeng-=16; } //Get Encryption Data To Array Byte[] EncryptData = Bytelist.ToArray(); //Reproduce for the length DataLeng = EncryptData.Length; Bytelist.Clear(); Console.WriteLine(Encoding.UTF8.GetString(EncryptData)); //Decrypted Note....Almost... for (int i = 0; i < count; i++) { int j = 16; if (DataLeng < 16) j = DataLeng; Byte[] TemplateArr = new Byte[16]; Array.Copy(EncryptData, i * j, TemplateArr, 0, j); ProtectedMemory.Unprotect(TemplateArr, MemoryProtectionScope.SameLogon); Bytelist.AddRange(TemplateArr); DataLeng -= 16; } Console.WriteLine(Encoding.UTF8.GetString(Bytelist.ToArray()));