static void Main(string[] args)
{
string keyString = null;
while (string.IsNullOrWhiteSpace(keyString))
{
Console.WriteLine("Enter key word:");
keyString = Console.ReadLine();
}
var key = Encoding.UTF8.GetBytes(keyString);
var fileName = args.Single();
var fileContent = new LazyFileReader(fileName);
var prefix = fileContent.Take(2).ToArray();
var cryptAsBmp = false;
if (prefix[0] == 0x42 && prefix[1] == 0x4D)
{
cryptAsBmp = IsCryptAsBmp();
}
IEnumerable <byte> result;
var rc4 = new RC4lAgorithm();
if (cryptAsBmp)
{
var byteOffset = fileContent.Skip(10).Take(4).ToArray();
var intOffset = BitConverter.ToInt32(byteOffset, 0);
result = fileContent
.Take(intOffset)
.Concat(rc4.Crypt(
fileContent.Skip(intOffset), key));
}
else
{
result = rc4.Crypt(fileContent, key);
}
var fileWriter = new LazyFileWriter(GenerateFileName(fileName));
fileWriter.Write(result);
}
static void Main(string[] args)
{
var fileName = args.Single();
var mode = ChooseMode();
var fileContent = new LazyFileReader(fileName);
var strategy = new PCBCCryptingStrategy <Iso10126PaddingStandard>(k => new TEACrypter(k));
var key = File.ReadAllBytes("key");
var initializingVector = File.ReadAllBytes("initializingVector");
if (mode == Mode.Encrypt)
{
var encryptedContent = strategy.Encrypt(fileContent, key, initializingVector);
var fileWriter = new LazyFileWriter(GenerateFileName(fileName, "encrypted"));
fileWriter.Write(encryptedContent);
}
if (mode == Mode.Decrypt)
{
var decrypt = strategy.Decrypt(fileContent, key, initializingVector);
var fileWriter = new LazyFileWriter(GenerateFileName(fileName, "decrypted"));
fileWriter.Write(decrypt);
}
}
static void Main(string[] args)
{
var fileName = args.Single();
var mode = ChooseMode();
var fileContent = new LazyFileReader(fileName);
if (mode == Mode.Encrypt)
{
var alphabet = GetAlphabet();
var encryptedContent = new CaesarEncrypter(alphabet).Encrypt(fileContent);
var fileWriter = new LazyFileWriter(GenerateFileName(fileName, "encrypted"));
fileWriter.Write(encryptedContent);
}
if (mode == Mode.Decrypt)
{
var alphabet = GetAlphabet();
var decrypt = new CaesarDecrypter(alphabet).Decrypt(fileContent);
var fileWriter = new LazyFileWriter(GenerateFileName(fileName, "decrypted"));
fileWriter.Write(decrypt);
}
if (mode == Mode.Analyze)
{
Console.WriteLine("Analyzing...");
var byteFrequencies = new ByteFrequencyAnalyzer().Analyze(fileContent).ToArray();
var index = 0;
Console.WriteLine("The most common bytes:");
foreach (var batch in byteFrequencies.Batch(10))
{
foreach (var byteFrequency in batch)
{
Console.WriteLine($"{++index}. {byteFrequency}");
}
bool skip;
while (true)
{
Console.WriteLine("Continue? (y/n)");
var input = Console.ReadLine();
if (input == "Y" || input == "y")
{
skip = false;
break;
}
if (input == "N" || input == "n")
{
skip = true;
break;
}
}
if (skip)
{
break;
}
}
var sb = new StringBuilder();
sb.AppendLine("Байт,количество");
foreach (var frequency in byteFrequencies)
{
sb.AppendLine($"{frequency.Value},{frequency.Frequency}");
}
File.WriteAllText(GenerateFileName(fileName, "analyzed"), sb.ToString());
}
}