using System; namespace Stego_Console { class Program { public static void Main(string[] args) { bool flag = true; do { Console.WriteLine("What ddo you want to do with audio file? (Hide - 1 or Recover - 2 a text)"); string action = Console.ReadLine(); switch(action) { case "1": try { Console.WriteLine("Please, enter path to audio file:"); F_H_For_In.setSound(Console.ReadLine()); Console.WriteLine("Now enter path to text file:"); F_H_For_In.setText(Console.ReadLine()); try { F_H_For_In.step(); Stego_In si = new Stego_In(); si.hiderLength(); si.hiderText(); F_H_For_In.soundReWriter(si.b_snd); Console.WriteLine("Stegofile is created."); } catch (LengthException l) { Console.WriteLine(l.MessageIn); } } catch (FileException f) { Console.WriteLine(f.Message); } break; case "2": try { Console.WriteLine("Please, enter path to audio file:"); F_H_For_Out.setSound(Console.ReadLine()); try { Stego_Out so = new Stego_Out(); so.textRecover(); F_H_For_Out.textWriter(so.txt); Console.WriteLine("Text recover."); } catch (LengthException l) { Console.WriteLine(l.MessageOut); } } catch (FileException f) { Console.WriteLine(f.Message); } break; default: Console.WriteLine("Incorrect enter!"); break; } Console.WriteLine("Continue? (1 - Yes or 2 - No)"); string s = Console.ReadLine(); switch(s) { case "1": flag = true; break; case "2": flag = false; break; default: Console.WriteLine("Incorrect enter!"); flag = true; break; } } while (flag); } } }   /* * Created by SharpDevelop. * User: * Date: 11.12.2012 * Time: 19:07 * To change this template use Tools | Options | Coding | Edit Standard Headers. */ using System; namespace Stego_Console { // Overrides FileNotFound Exception public class FileException : System.Exception { public FileException(){} public override string Message { get { return "File not Found!"; } } } }   /* * Created by SharpDevelop. * User: * Date: 11.12.2012 * Time: 19:02 * To change this template use Tools | Options | Coding | Edit Standard Headers. */ using System; namespace Stego_Console { // Exception of lenghth of step public class LengthException : System.Exception { public LengthException(){} public string MessageIn { get { return "Text is too long!"; } } public string MessageOut { get { return "This action is meaningless!"; } } } }  /* * Created by SharpDevelop. * User: * Date: 24.11.2012 * Time: 7:51 * To change this template use Tools | Options | Coding | Edit Standard Headers. */ using System; using System.IO; using System.Runtime.InteropServices; namespace Stego_Console { // Operate header of WAV-file; get information about encoding [StructLayout(LayoutKind.Sequential)] // Struct describing header of WAV-file internal class WavHeader { // WAV-format starts with RIFF-header: contains ASCII-character "RIFF" // (0x52494646 in big-endian form) public UInt32 ChunkId; // 36 + subchunk2Size, or more exactly: 4 + (8 + subchunk1Size) + (8 + subchunk2Size) public UInt32 ChunkSize; // Contains characters "WAVE" (0x57415645 in big-endian form) public UInt32 Format; // Format "WAVE" consists of two subchains: "fmt " and "data": // Subchain "fmt " describe format of audio data: contains characters "fmt " // (0x666d7420 in big-endian form) public UInt32 Subchunk1Id; // 16 for PCM-format public UInt32 Subchunk1Size; // Audio-format // For PCM = 1 (linear quantization) public UInt16 AudioFormat; // Number of channels public UInt16 NumChannels; // Sampling rate public UInt32 SampleRate; // sampleRate * numChannels * bitsPerSample/8 public UInt32 ByteRate; // numChannels * bitsPerSample/8 // Number of bytes for one sample; includong all channels public UInt16 BlockAlign; // Bits per sample public UInt16 BitsPerSample; // Subchain "data" contains audio-data and its size // Contains characters "data" (0x64617461 in big-endian form) public UInt32 Subchunk2Id; // numSamples * numChannels * bitsPerSample/8 // Number of bytes in data realm public UInt32 Subchunk2Size; // Audio-data } static class Audio_Info { public static int info(string name) { var header = new WavHeader(); // Size of header var headerSize = Marshal.SizeOf(header); var fileStream = new FileStream(name, FileMode.Open, FileAccess.Read); var buffer = new byte[headerSize]; fileStream.Read(buffer, 0, headerSize); var headerPtr = Marshal.AllocHGlobal(headerSize); Marshal.Copy(buffer, 0, headerPtr, headerSize); Marshal.PtrToStructure(headerPtr, header); return header.BitsPerSample; } } }   /* * Created by SharpDevelop. * User: * Date: 11.12.2012 * Time: 18:32 * To change this template use Tools | Options | Coding | Edit Standard Headers. */ using System; using System.IO; namespace Stego_Console { // Primary handler for stego_in operation public static class F_H_For_In { public static string snd_name; public static string txt_name; public static void setSound(string path) { snd_name = path; if (!File.Exists(snd_name)) { throw new FileException(); } } public static void setText(string path) { txt_name = path; if (!File.Exists(txt_name)) { throw new FileException(); } } public static byte[] textReader() { return File.ReadAllBytes(txt_name); } public static byte[] soundReader() { return File.ReadAllBytes(snd_name); } public static void soundReWriter(byte[] snd) { String n_path = snd_name.Replace(".wav", "_stego.wav"); File.WriteAllBytes(n_path, snd); } public static int step() { long p; int k = Audio_Info.info(snd_name); p = (F_H_For_In.soundReader().LongLength-174)/(F_H_For_In.textReader().LongLength*k); if (p < 4) { throw new LengthException(); } return (int) p; } } }   /* * Created by SharpDevelop. * User: * Date: 24.11.2012 * Time: 7:53 * To change this template use Tools | Options | Coding | Edit Standard Headers. */ using System; using System.IO; namespace Stego_Console { // Primary operation of files public static class F_H_For_Out { public static string snd_name; public static void setSound(string path) { snd_name = path; if (!File.Exists(snd_name)) { throw new FileException(); } } public static byte[] soundReader() { return File.ReadAllBytes(snd_name); } public static void textWriter(byte[] txt) { string n_path = snd_name.Replace(".wav", "_from_stego.txt"); File.WriteAllBytes(n_path, txt); } public static int step(int l) { long p; int k = Audio_Info.info(snd_name); p = (F_H_For_Out.soundReader().LongLength-174)/(l*k); if (p < 4) { throw new LengthException(); } return (int) p; } } }   /* * Created by SharpDevelop. * User: * Date: 24.11.2012 * Time: 7:56 * To change this template use Tools | Options | Coding | Edit Standard Headers. */ using System; using System.Collections; using System.IO; namespace Stego_Console { // Hide text in audiofile public class Stego_In { public Stego_In(){} private readonly int step = F_H_For_In.step(); private BitArray length = new BitArray(codeLength()); private BitArray b_txt = new BitArray(F_H_For_In.textReader()); public byte[] b_snd = F_H_For_In.soundReader(); public void hiderLength() { int j = 46; for (int i = 0; i < length.Count; i++) { byteChange(b_snd[j], length); j += 4; } } public void hiderText() { long j = 180; for (int i = 0; i < b_txt.Count; i++) { byteChange(b_snd[j], b_txt); j += step; } } private static byte[] codeLength() { byte[] b = new byte[4]; int l = F_H_For_In.textReader().Length; for (int i = 0; i <= 3; i++) { b = (byte) ((l >> (8 * i)) & 0x000F); } return b; } private byte byteChange(byte b, bool curr) { byte[] nb = new byte[1] {b}; BitArray ba = new BitArray(nb); ba.Set(0, curr); b = 0; for (int i = 0; i < 8; i++) { if (ba == true) { b += (byte) Math.Pow(2, i); } } return nb[0]; } } } /* * Created by SharpDevelop. * User: * Date: 24.11.2012 * Time: 7:57 * To change this template use Tools | Options | Coding | Edit Standard Headers. */ using System; using System.Collections; namespace Stego_Console { // Recover text from audio file public class Stego_Out { public Stego_Out(){} private readonly int step = F_H_For_Out.step(lengthReader()); private static BitArray length = new BitArray(32); private BitArray b_txt = new BitArray(lengthReader()*8); private static byte[] b_snd = F_H_For_Out.soundReader(); public byte[] txt = new byte[lengthReader()]; public static int lengthReader() { int j = 46; for (int i = 0; i < 32; i++) { length.Set(i, bitRead(b_snd[j])); j += 4; } byte[] l = bitsToBytes(length); int ln = BitConverter.ToInt32(l, 0); if (ln <= 0) { throw new LengthException(); } return ln; } public void textRecover() { long j = 180; for (int i = 0; i < b_txt.Count; i++) { b_txt = bitRead(b_snd[j]); j += step; } txt = bitsToBytes(b_txt); } private static byte[] bitsToBytes(BitArray ba) { const int bb = 8; byte[] b = new byte[(ba.Count + (bb - 1))/bb]; ba.CopyTo(b, 0); return b; } private static bool bitRead(byte b) { byte[] nb = new byte[1] {b}; BitArray ba = new BitArray(nb); bool bo = ba.Get(0); return bo; } } }
