Initial commit

.gitignore

@@ -0,0 +1,254 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.pfx
+*.publishsettings
+node_modules/
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+.vscode/

AddFingerprintCommand.cs

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+using Microsoft.Extensions.CommandLineUtils;
+using System;
+
+namespace StegoPrint {
+    public class AddFingerprintCommand : CommandLineApplication {
+        CommandOption _message;
+        CommandOption _keyfile;
+        CommandOption _input;
+        CommandOption _output;
+
+        public AddFingerprintCommand() {
+            Name = "add";
+            Description = "Adds a fingerprint to an audio file";
+
+            _message = Option("-$|-m |--message <message>", "The message to embed in the file", CommandOptionType.SingleValue);
+            _keyfile = Option("-$|-k |--keyfile <keyfile>", "The keyfile for the fingerprint", CommandOptionType.SingleValue);
+            _input = Option("-$|-i |--input <input>", "The input audio file to process", CommandOptionType.SingleValue);
+            _output = Option("-$|-o |--output <output>", "The output file", CommandOptionType.SingleValue);
+
+            HelpOption("-h | -? | --help");
+            OnExecute((Func<int>)RunCommand);
+        }
+
+        private int RunCommand() {
+            new Fingerprinter().AddMessage(_message.Value(), _keyfile.Value(), _input.Value(), _output.Value());
+            return -1;
+        }
+    }
+}

App.cs

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+using Microsoft.Extensions.CommandLineUtils;
+using System;
+
+namespace StegoPrint {
+    class App : CommandLineApplication {
+        public App() {
+            Commands.Add(new AddFingerprintCommand());
+            Commands.Add(new ExtractFingerprintCommand());
+        }
+    }
+}

ExtractFingerprintCommand.cs

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+using Microsoft.Extensions.CommandLineUtils;
+using System;
+
+namespace StegoPrint {
+    public class ExtractFingerprintCommand : CommandLineApplication {
+        CommandOption _keyfile;
+        CommandOption _input;
+        public ExtractFingerprintCommand() {
+            Name = "extract";
+            Description = "Extracts a fingerprint from a file";
+
+            _keyfile = Option("-$|-k |--keyfile <keyfile>", "The keyfile for the fingerprint", CommandOptionType.SingleValue);
+            _input = Option("-$|-i |--input <input>", "The input audio file to process", CommandOptionType.SingleValue);
+
+            HelpOption("-h | -? | --help");
+            OnExecute((Func<int>)RunCommand);
+        }
+
+        private int RunCommand() {
+            new Fingerprinter().ExtractMessage(_keyfile.Value(), _input.Value());
+            return -1;
+        }
+    }
+}

Fingerprinter.cs

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+using System;
+using System.IO;
+using System.Text;
+
+namespace StegoPrint {
+    public class Fingerprinter {
+        private Stream GetMessageStream(string message) {
+            BinaryWriter messageWriter = new BinaryWriter(new MemoryStream());
+            messageWriter.Write(message.Length);
+            messageWriter.Write(Encoding.ASCII.GetBytes(message));
+            messageWriter.Seek(0, SeekOrigin.Begin);
+            return messageWriter.BaseStream;
+        }
+
+        public void AddMessage(string message, string keyFile, string inputFile, string outputFile) {
+            Stream sourceStream = null;
+            FileStream destinationStream = null;
+            WaveStream audioStream = null;
+
+            //create a stream that contains the message, preceeded by its length
+            Stream messageStream = GetMessageStream(message);
+            //open the key file
+            Stream keyStream = new FileStream(keyFile, FileMode.Open);
+
+            try {
+
+                //how man samples do we need?
+                long countSamplesRequired = WaveUtility.CheckKeyForMessage(keyStream, messageStream.Length);
+
+                if (countSamplesRequired > Int32.MaxValue) {
+                    throw new Exception("Message too long, or bad key! This message/key combination requires " + countSamplesRequired + " samples, only " + Int32.MaxValue + " samples are allowed.");
+                }
+
+                sourceStream = new FileStream(inputFile, FileMode.Open);
+
+                //create an empty file for the carrier wave
+                destinationStream = new FileStream(outputFile, FileMode.Create);
+
+                //copy the carrier file's header
+                audioStream = new WaveStream(sourceStream, destinationStream);
+                if (audioStream.Length <= 0) {
+                    throw new Exception("Invalid WAV file");
+                }
+
+                //are there enough samples in the carrier wave?
+                if (countSamplesRequired > audioStream.CountSamples) {
+                    String errorReport = "The carrier file is too small for this message and key!\r\n" +
+                        "Samples available: " + audioStream.CountSamples + "\r\n" +
+                        "Samples needed: " + countSamplesRequired;
+                    throw new Exception(errorReport);
+                }
+
+                //hide the message
+                WaveUtility utility = new WaveUtility(audioStream, destinationStream);
+                utility.Hide(messageStream, keyStream);
+            } catch (Exception ex) {
+                Console.WriteLine($"Error: {ex.Message}");
+            } finally {
+                if (keyStream != null) { keyStream.Dispose(); }
+                if (messageStream != null) { messageStream.Dispose(); }
+                if (audioStream != null) { audioStream.Dispose(); }
+                if (sourceStream != null) { sourceStream.Dispose(); }
+                if (destinationStream != null) { destinationStream.Dispose(); }
+            }
+        }
+        public void ExtractMessage(string keyFile, string inputFile) {
+            FileStream sourceStream = null;
+            WaveStream audioStream = null;
+            //create an empty stream to receive the extracted message
+            MemoryStream messageStream = new MemoryStream();
+            //open the key file
+            Stream keyStream = new FileStream(keyFile, FileMode.Open);
+
+            try {
+                //open the carrier file
+                sourceStream = new FileStream(inputFile, FileMode.Open);
+                audioStream = new WaveStream(sourceStream);
+                WaveUtility utility = new WaveUtility(audioStream);
+
+                //exctract the message from the carrier wave
+                utility.Extract(messageStream, keyStream);
+
+                messageStream.Seek(0, SeekOrigin.Begin);
+                string extractedMessage = new StreamReader(messageStream).ReadToEnd();
+
+                Console.WriteLine("Message is.....");
+                Console.WriteLine(extractedMessage);
+
+                Console.ReadKey();
+            } catch (Exception ex) {
+                Console.WriteLine($"Error extracting message {ex.Message}");
+            } finally {
+                if (keyStream != null) { keyStream.Dispose(); }
+                if (messageStream != null) { messageStream.Dispose(); }
+                if (audioStream != null) { audioStream.Dispose(); }
+                if (sourceStream != null) { sourceStream.Dispose(); }
+            }
+        }
+
+    }
+}

Program.cs

@@ -0,0 +1,16 @@
+using Microsoft.Extensions.CommandLineUtils;
+using System;
+using System.Collections.Generic;
+
+namespace StegoPrint {
+    class Program {
+        static int Main(string[] args) {
+            try {
+                return new App().Execute(args);
+            } catch (Exception ex) {
+                Console.Write(ex);
+                return 1;
+            }
+        }
+    }
+}

Properties/launchSettings.json

@@ -0,0 +1,8 @@
+{
+  "profiles": {
+    "stegoprint": {
+      "commandName": "Project",
+      "commandLineArgs": "extract -k \"C:\\dev\\working\\stegano\\mylib\\keyfile.txt\" -i \"C:\\dev\\working\\stegano\\mylib\\out.wav\""
+    }
+  }
+}

WaveFormat.cs

@@ -0,0 +1,29 @@
+using System.Runtime.InteropServices;
+
+namespace StegoPrint {
+    public enum WaveFormats {
+        Pcm = 1,
+        Float = 3
+    }
+    [StructLayout (LayoutKind.Sequential)]
+    public class WaveFormat {
+        public short wFormatTag;
+        public short nChannels;
+        public int nSamplesPerSec;
+        public int nAvgBytesPerSec;
+        public short nBlockAlign;
+        public short wBitsPerSample;
+        public short cbSize;
+
+        public WaveFormat (int rate, int bits, int channels) {
+            wFormatTag = (short) WaveFormats.Pcm;
+            nChannels = (short) channels;
+            nSamplesPerSec = rate;
+            wBitsPerSample = (short) bits;
+            cbSize = 0;
+
+            nBlockAlign = (short) (channels * (bits / 8));
+            nAvgBytesPerSec = nSamplesPerSec * nBlockAlign;
+        }
+    }
+}

WaveStream.cs

@@ -0,0 +1,263 @@
+using System;
+using System.IO;
+
+namespace StegoPrint {
+    public class WaveStream : Stream, IDisposable {
+        private Stream m_Stream;
+        private long m_DataPos;
+        private int m_Length;
+
+        private WaveFormat m_Format;
+
+        public WaveFormat Format {
+            get { return m_Format; }
+        }
+
+        private string ReadChunk (BinaryReader reader) {
+            byte[] ch = new byte[4];
+            reader.Read (ch, 0, ch.Length);
+            return System.Text.Encoding.ASCII.GetString (ch);
+        }
+
+        private void ReadHeader () {
+            BinaryReader Reader = new BinaryReader (m_Stream);
+            if (ReadChunk (Reader) != "RIFF")
+                throw new Exception ("Invalid file format");
+
+            Reader.ReadInt32 (); // File length minus first 8 bytes of RIFF description, we don't use it
+
+            if (ReadChunk (Reader) != "WAVE")
+                throw new Exception ("Invalid file format");
+
+            if (ReadChunk (Reader) != "fmt ")
+                throw new Exception ("Invalid file format");
+
+            int len = Reader.ReadInt32 ();
+            if (len < 16) // bad format chunk length
+                throw new Exception ("Invalid file format");
+
+            m_Format = new WaveFormat (22050, 16, 2); // initialize to any format
+            m_Format.wFormatTag = Reader.ReadInt16 ();
+            m_Format.nChannels = Reader.ReadInt16 ();
+            m_Format.nSamplesPerSec = Reader.ReadInt32 ();
+            m_Format.nAvgBytesPerSec = Reader.ReadInt32 ();
+            m_Format.nBlockAlign = Reader.ReadInt16 ();
+            m_Format.wBitsPerSample = Reader.ReadInt16 ();
+
+            // advance in the stream to skip the wave format block 
+            len -= 16; // minimum format size
+            while (len > 0) {
+                Reader.ReadByte ();
+                len--;
+            }
+
+            // assume the data chunk is aligned
+            while (m_Stream.Position < m_Stream.Length && ReadChunk (Reader) != "data")
+            ;
+
+            if (m_Stream.Position >= m_Stream.Length)
+                throw new Exception ("Invalid file format");
+
+            m_Length = Reader.ReadInt32 ();
+            m_DataPos = m_Stream.Position;
+
+            Position = 0;
+        }
+
+        /// <summary>ReadChunk(reader) - Changed to CopyChunk(reader, writer)</summary>
+        /// <param name="reader">source stream</param>
+        /// <returns>four characters</returns>
+        private string CopyChunk (BinaryReader reader, BinaryWriter writer) {
+            byte[] ch = new byte[4];
+            reader.Read (ch, 0, ch.Length);
+
+            //copy the chunk
+            writer.Write (ch);
+
+            return System.Text.Encoding.ASCII.GetString (ch);
+        }
+
+        /// <summary>ReadHeader() - Changed to CopyHeader(destination)</summary>
+        private void CopyHeader (Stream destinationStream) {
+            BinaryReader reader = new BinaryReader (m_Stream);
+            BinaryWriter writer = new BinaryWriter (destinationStream);
+
+            if (CopyChunk (reader, writer) != "RIFF")
+                throw new Exception ("Invalid file format");
+
+            writer.Write (reader.ReadInt32 ()); // File length minus first 8 bytes of RIFF description
+
+            if (CopyChunk (reader, writer) != "WAVE")
+                throw new Exception ("Invalid file format");
+
+            if (CopyChunk (reader, writer) != "fmt ")
+                throw new Exception ("Invalid file format");
+
+            int len = reader.ReadInt32 ();
+            if (len < 16) { // bad format chunk length
+                throw new Exception ("Invalid file format");
+            } else {
+                writer.Write (len);
+            }
+
+            m_Format = new WaveFormat (22050, 16, 2); // initialize to any format
+            m_Format.wFormatTag = reader.ReadInt16 ();
+            m_Format.nChannels = reader.ReadInt16 ();
+            m_Format.nSamplesPerSec = reader.ReadInt32 ();
+            m_Format.nAvgBytesPerSec = reader.ReadInt32 ();
+            m_Format.nBlockAlign = reader.ReadInt16 ();
+            m_Format.wBitsPerSample = reader.ReadInt16 ();
+
+            //copy format information
+            writer.Write (m_Format.wFormatTag);
+            writer.Write (m_Format.nChannels);
+            writer.Write (m_Format.nSamplesPerSec);
+            writer.Write (m_Format.nAvgBytesPerSec);
+            writer.Write (m_Format.nBlockAlign);
+            writer.Write (m_Format.wBitsPerSample);
+
+            // advance in the stream to skip the wave format block 
+            len -= 16; // minimum format size
+            writer.Write (reader.ReadBytes (len));
+            len = 0;
+            /*while (len > 0)
+            {
+            	reader.ReadByte();
+            	len--;
+            }*/
+
+            // assume the data chunk is aligned
+            while (m_Stream.Position < m_Stream.Length && CopyChunk (reader, writer) != "data")
+            ;
+
+            if (m_Stream.Position >= m_Stream.Length)
+                throw new Exception ("Invalid file format");
+
+            m_Length = reader.ReadInt32 ();
+            writer.Write (m_Length);
+
+            m_DataPos = m_Stream.Position;
+            Position = 0;
+        }
+
+        /// <summary>Write a new header</summary>
+        public static Stream CreateStream (Stream waveData, WaveFormat format) {
+            MemoryStream stream = new MemoryStream ();
+            BinaryWriter writer = new BinaryWriter (stream);
+
+            writer.Write (System.Text.Encoding.ASCII.GetBytes ("RIFF".ToCharArray ()));
+
+            writer.Write ((Int32) (waveData.Length + 36)); //File length minus first 8 bytes of RIFF description
+
+            writer.Write (System.Text.Encoding.ASCII.GetBytes ("WAVEfmt ".ToCharArray ()));
+
+            writer.Write ((Int32) 16); //length of following chunk: 16
+
+            writer.Write ((Int16) format.wFormatTag);
+            writer.Write ((Int16) format.nChannels);
+            writer.Write ((Int32) format.nSamplesPerSec);
+            writer.Write ((Int32) format.nAvgBytesPerSec);
+            writer.Write ((Int16) format.nBlockAlign);
+            writer.Write ((Int16) format.wBitsPerSample);
+
+            writer.Write (System.Text.Encoding.ASCII.GetBytes ("data".ToCharArray ()));
+
+            writer.Write ((Int32) waveData.Length);
+
+            waveData.Seek (0, SeekOrigin.Begin);
+            byte[] b = new byte[waveData.Length];
+            waveData.Read (b, 0, (int) waveData.Length);
+            writer.Write (b);
+
+            writer.Seek (0, SeekOrigin.Begin);
+            return stream;
+        }
+
+        public WaveStream (Stream sourceStream, Stream destinationStream) {
+            m_Stream = sourceStream;
+            CopyHeader (destinationStream);
+        }
+
+        public WaveStream (Stream sourceStream) {
+                m_Stream = sourceStream;
+                ReadHeader ();
+            }
+
+            ~WaveStream () {
+                Dispose ();
+            }
+
+        public new void Dispose () {
+            base.Dispose ();
+            GC.SuppressFinalize (this);
+        }
+
+        public override bool CanRead {
+            get { return true; }
+        }
+        public override bool CanSeek {
+            get { return true; }
+        }
+        public override bool CanWrite {
+            get { return false; }
+        }
+        public override long Length {
+            get { return m_Length; }
+        }
+
+        /// <summary>Length of the data (in samples)</summary>
+        public long CountSamples {
+            get { return (long) ((m_Length - m_DataPos) / (m_Format.wBitsPerSample / 8)); }
+        }
+
+        public override long Position {
+            get { return m_Stream.Position - m_DataPos; }
+            set { Seek (value, SeekOrigin.Begin); }
+        }
+        public override void Flush () { }
+        public override void SetLength (long len) {
+            throw new InvalidOperationException ();
+        }
+        public override long Seek (long pos, SeekOrigin o) {
+            switch (o) {
+                case SeekOrigin.Begin:
+                    m_Stream.Position = pos + m_DataPos;
+                    break;
+                case SeekOrigin.Current:
+                    m_Stream.Seek (pos, SeekOrigin.Current);
+                    break;
+                case SeekOrigin.End:
+                    m_Stream.Position = m_DataPos + m_Length - pos;
+                    break;
+            }
+            return this.Position;
+        }
+
+        public override int Read (byte[] buf, int ofs, int count) {
+            int toread = (int) Math.Min (count, m_Length - Position);
+            return m_Stream.Read (buf, ofs, toread);
+        }
+
+        /// <summary>Read - Changed to Copy</summary>
+        /// <param name="buf">Buffer to receive the data</param>
+        /// <param name="ofs">Offset</param>
+        /// <param name="count">Count of bytes to read</param>
+        /// <param name="destination">Where to copy the buffer</param>
+        /// <returns>Count of bytes actually read</returns>
+        public int Copy (byte[] buf, int ofs, int count, Stream destination) {
+            int toread = (int) Math.Min (count, m_Length - Position);
+            int read = m_Stream.Read (buf, ofs, toread);
+            destination.Write (buf, ofs, read);
+
+            if (m_Stream.Position != destination.Position) {
+                Console.WriteLine ();
+            }
+
+            return read;
+        }
+
+        public override void Write (byte[] buf, int ofs, int count) {
+            throw new InvalidOperationException ();
+        }
+    }
+}

WaveUtility.cs

@@ -0,0 +1,203 @@
+using System.IO;
+
+namespace StegoPrint {
+    public class WaveUtility {
+        /// <summary>
+        /// The read-only stream.
+        /// Clean wave for hiding,
+        /// Carrier wave for extracting
+        /// </summary>
+        private WaveStream sourceStream;
+
+        /// <summary>Stream to receive the edited carrier wave</summary>
+        private Stream destinationStream;
+
+        /// <summary>bits per sample / 8</summary>
+        private int bytesPerSample;
+
+        /// <summary>Initializes a new WaveUtility for hiding a message</summary>
+        /// <param name="sourceStream">Clean wave</param>
+        /// <param name="destinationStream">
+        /// Header of the clean wave
+        /// This stream will receive the complete carrier wave
+        /// </param>
+        public WaveUtility (WaveStream sourceStream, Stream destinationStream) : this (sourceStream) {
+            this.destinationStream = destinationStream;
+        }
+
+        /// <summary>Initializes a new WaveUtility for extracting a message</summary>
+        /// <param name="sourceStream">Carrier wave</param>
+        public WaveUtility (WaveStream sourceStream) {
+            this.sourceStream = sourceStream;
+            this.bytesPerSample = sourceStream.Format.wBitsPerSample / 8;
+        }
+
+        /// <summary>
+        /// Hide [messageStream] in [sourceStream],
+        /// write the result to [destinationStream]
+        /// </summary>
+        /// <param name="messageStream">The message to hide</param>
+        /// <param name="keyStream">
+        /// A key stream that specifies how many samples shall be
+        /// left clean between two changed samples
+        /// </param>
+        public void Hide (Stream messageStream, Stream keyStream) {
+
+            byte[] waveBuffer = new byte[bytesPerSample];
+            byte message, bit, waveByte;
+            int messageBuffer; //receives the next byte of the message or -1
+            int keyByte; //distance of the next carrier sample
+
+            while ((messageBuffer = messageStream.ReadByte ()) >= 0) {
+                //read one byte of the message stream
+                message = (byte) messageBuffer;
+
+                //for each bit in message
+                for (int bitIndex = 0; bitIndex < 8; bitIndex++) {
+
+                    //read a byte from the key
+                    keyByte = GetKeyValue (keyStream);
+
+                    //skip a couple of samples
+                    for (int n = 0; n < keyByte - 1; n++) {
+                        //copy one sample from the clean stream to the carrier stream
+                        sourceStream.Copy (waveBuffer, 0, waveBuffer.Length, destinationStream);
+                    }
+
+                    //read one sample from the wave stream
+                    sourceStream.Read (waveBuffer, 0, waveBuffer.Length);
+                    waveByte = waveBuffer[bytesPerSample - 1];
+
+                    //get the next bit from the current message byte...
+                    bit = (byte) (((message & (byte) (1<<bitIndex))> 0) ? 1 : 0);
+
+                    //...place it in the last bit of the sample
+                    if ((bit == 1) && ((waveByte % 2) == 0)) {
+                        waveByte += 1;
+                    } else if ((bit == 0) && ((waveByte % 2) == 1)) {
+                        waveByte -= 1;
+                    }
+
+                    waveBuffer[bytesPerSample - 1] = waveByte;
+
+                    //write the result to destinationStream
+                    destinationStream.Write (waveBuffer, 0, bytesPerSample);
+                }
+            }
+
+            //copy the rest of the wave without changes
+            waveBuffer = new byte[sourceStream.Length - sourceStream.Position];
+            sourceStream.Read (waveBuffer, 0, waveBuffer.Length);
+            destinationStream.Write (waveBuffer, 0, waveBuffer.Length);
+        }
+
+        /// <summary>Extract a message from [sourceStream] into [messageStream]</summary>
+        /// <param name="messageStream">Empty stream to receive the extracted message</param>
+        /// <param name="keyStream">
+        /// A key stream that specifies how many samples shall be
+        /// skipped between two carrier samples
+        /// </param>
+        public void Extract (Stream messageStream, Stream keyStream) {
+
+            byte[] waveBuffer = new byte[bytesPerSample];
+            byte message, bit, waveByte;
+            int messageLength = 0; //expected length of the message
+            int keyByte; //distance of the next carrier sample
+
+            while ((messageLength == 0 || messageStream.Length < messageLength)) {
+                //clear the message-byte
+                message = 0;
+
+                //for each bit in message
+                for (int bitIndex = 0; bitIndex < 8; bitIndex++) {
+
+                    //read a byte from the key
+                    keyByte = GetKeyValue (keyStream);
+
+                    //skip a couple of samples
+                    for (int n = 0; n < keyByte - 1; n++) {
+                        //read one sample from the wave stream
+                        sourceStream.Read (waveBuffer, 0, waveBuffer.Length);
+                    }
+                    sourceStream.Read (waveBuffer, 0, waveBuffer.Length);
+                    waveByte = waveBuffer[bytesPerSample - 1];
+
+                    //get the last bit of the sample...
+                    bit = (byte) (((waveByte % 2) == 0) ? 0 : 1);
+
+                    //...write it into the message-byte
+                    message += (byte) (bit << bitIndex);
+                }
+
+                //add the re-constructed byte to the message
+                messageStream.WriteByte (message);
+
+                if (messageLength == 0 && messageStream.Length == 4) {
+                    //first 4 bytes contain the message's length
+                    messageStream.Seek (0, SeekOrigin.Begin);
+                    messageLength = new BinaryReader (messageStream).ReadInt32 ();
+                    messageStream.Seek (0, SeekOrigin.Begin);
+                    messageStream.SetLength (0);
+                }
+            }
+
+        }
+
+        /// <summary>Counts the samples that will be skipped using the specified key stream</summary>
+        /// <param name="keyStream">Key stream</param>
+        /// <param name="messageLength">Length of the message</param>
+        /// <returns>Minimum length (in samples) of an audio file</returns>
+        public static long CheckKeyForMessage (Stream keyStream, long messageLength) {
+            long messageLengthBits = messageLength * 8;
+            long countRequiredSamples = 0;
+
+            if (messageLengthBits > keyStream.Length) {
+                long keyLength = keyStream.Length;
+
+                // read existing key
+                byte[] keyBytes = new byte[keyLength];
+                keyStream.Read (keyBytes, 0, keyBytes.Length);
+
+                // Every byte stands for the distance between two useable samples.
+                // The sum of those distances is the required count of samples.
+                countRequiredSamples = SumKeyArray (keyBytes);
+
+                // The key must be repeated, until every bit of the message has a key byte.
+                double countKeyCopies = messageLengthBits / keyLength;
+                countRequiredSamples = (long) (countRequiredSamples * countKeyCopies);
+            } else {
+                byte[] keyBytes = new byte[messageLengthBits];
+                keyStream.Read (keyBytes, 0, keyBytes.Length);
+                countRequiredSamples = SumKeyArray (keyBytes);
+            }
+
+            keyStream.Seek (0, SeekOrigin.Begin);
+            return countRequiredSamples;
+        }
+
+        private static long SumKeyArray (byte[] values) {
+            long sum = 0;
+            foreach (int value in values) { // '0' causes a distance of one sample,
+                // every other key causes a distance of its exact value.
+                sum += (value == 0) ? 1 : value;
+            }
+            return sum;
+        }
+
+        /// <summary>
+        /// Read the next byte of the key stream.
+        /// Reset the stream if it is too short.
+        /// </summary>
+        /// <param name="keyStream">The key stream</param>
+        /// <returns>The next key byte</returns>
+        private static byte GetKeyValue (Stream keyStream) {
+            int keyValue;
+            if ((keyValue = keyStream.ReadByte ()) < 0) {
+                keyStream.Seek (0, SeekOrigin.Begin);
+                keyValue = keyStream.ReadByte ();
+                if (keyValue == 0) { keyValue = 1; }
+            }
+            return (byte) keyValue;
+        }
+    }
+}

commands.txt

@@ -0,0 +1,2 @@
+add -m "ArgleBargle" -k "C:\dev\working\stegano\mylib\keyfile.txt" -i "C:\dev\working\stegano\mylib\candidate.wav" -o "C:\dev\working\stegano\mylib\out.wav"
+extract -k "C:\dev\working\stegano\mylib\keyfile.txt" -i "C:\dev\working\stegano\mylib\out.wav"

keyfile.txt

@@ -0,0 +1 @@
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

stegoprint.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp1.1</TargetFramework>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.CommandLineUtils" Version="1.1.0" />
+    <PackageReference Include="System.Runtime.InteropServices" Version="4.3.0" />
+  </ItemGroup>
+</Project>