public void EncryptFile(string inputFile, string outputFile, byte[] key, string mode)
{
FileStream instream;
FileStream outstream;
try
{
double percent = 0.0;
long current = 0;
long sizeFile = 0;
var cipher = new GOST28147Engine();
cipher.Init(true, new KeyParameter(key.ToArray()));
IMode chosenMode = ChooseMode(mode, key, cipher);
outstream = File.Open(outputFile, FileMode.Create);
int chunkSize = 1024 * 1024;
using (instream = File.OpenRead(inputFile))
{
sizeFile = instream.Length;
ProgressChanged?.Invoke(0.0);
int byteRead = 0;
byte[] input = new byte[chunkSize];
byte[] output = new byte[chunkSize];
while (true)
{
byteRead = instream.Read(input, 0, chunkSize);
if (byteRead == chunkSize)
{
chosenMode.Process(input, output);
outstream.Write(output, 0, chunkSize);
}
else
{
byte[] temp = new byte[byteRead];
Array.Copy(input, 0, temp, 0, byteRead);
input = temp;
input = AddPadding(input.ToArray());
output = new byte[input.Length];
chosenMode.Process(input, output);
outstream.Write(output, 0, output.Length);
break;
}
current += byteRead;
percent = (double)current / sizeFile;
percent *= 100;
ProgressChanged?.Invoke(percent);
}
}
}
catch (Exception)
{
throw new Exception("Ошибка!");
}
outstream?.Close();
instream?.Close();
}
public override byte[] Decrypt(byte[] ciphertext, byte[] key, string mode)
{
byte[] result = new byte[ciphertext.Length];
var cipher = new GOST28147Engine();
cipher.Init(false, new KeyParameter(key.ToArray()));
IMode chosenMode = ChooseMode(mode, key, cipher);
chosenMode.Process(ciphertext, result);
return(RemovePadding(result));
}
public override byte[] Encrypt(byte[] text, byte[] key, string mode)
{
text = AddPadding(text);
var cipher = new GOST28147Engine();
cipher.Init(true, new KeyParameter(key.ToArray()));
IMode chosenMode = ChooseMode(mode, key, cipher);
byte[] result = new byte[text.Length];
chosenMode.Process(text, result);
return(result);
}
private IMode ChooseMode(string mode, byte[] key, GOST28147Engine engine)
{
IMode chosenMode;
switch (mode)
{
case "ECB":
chosenMode = new ECB(engine);
break;
case "CFB":
chosenMode = new CFB(engine, key.ToArray());
break;
default:
throw new Exception("Неправильный режим");
}
return(chosenMode);
}
