source: trunk/CrypPlugins/AES/AES.cs @ 717

Last change on this file since 717 was 717, checked in by Sven Rech, 12 years ago

some KeySearcher changes

File size: 30.2 KB
Line 
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202*/
203
204using System;
205using System.Collections.Generic;
206using System.Linq;
207using System.Text;
208using System.IO;
209using System.Security.Cryptography;
210using Cryptool.PluginBase;
211using System.ComponentModel;
212using Cryptool.PluginBase.Cryptography;
213using Cryptool.PluginBase.IO;
214using System.Windows.Controls;
215using System.Runtime.CompilerServices;
216using Cryptool.PluginBase.Miscellaneous;
217using System.Runtime.Remoting.Contexts;
218using Cryptool.PluginBase.Control;
219
220namespace Cryptool.Plugins.Cryptography.Encryption
221{
222    [Author("Dr. Arno Wacker", "arno.wacker@cryptool.org", "Uni Duisburg", "http://www.uni-duisburg-essen.de")]
223    [PluginInfo(false, "AES", "Advanced Encryption Standard (Rijndael)", "AES/DetailedDescription/Description.xaml", "AES/Images/AES.png", "AES/Images/encrypt.png", "AES/Images/decrypt.png", "AES/Images/Rijndael.png")]
224    [EncryptionType(EncryptionType.SymmetricBlock)]
225    public class AES : ContextBoundObject, IEncryption
226    {
227        #region Private variables
228        private AESSettings settings;
229        private CryptoolStream inputStream;
230        private CryptoolStream outputStream;
231        private byte[] inputKey;
232        private byte[] inputIV;
233        private CryptoStream p_crypto_stream;
234        private bool stop = false;
235        private List<CryptoolStream> listCryptoolStreamsOut = new List<CryptoolStream>();
236        #endregion
237
238        public AES()
239        {
240            this.settings = new AESSettings();
241            this.settings.OnPluginStatusChanged += settings_OnPluginStatusChanged;
242        }
243
244        void settings_OnPluginStatusChanged(IPlugin sender, StatusEventArgs args)
245        {
246          if (OnPluginStatusChanged != null) OnPluginStatusChanged(this, args);
247        }
248
249        public ISettings Settings
250        {
251            get { return this.settings; }
252            set { this.settings = (AESSettings)value; }
253        }
254
255        [PropertyInfo(Direction.InputData, "Input", "Data to be encrypted or decrypted", "", true, false, DisplayLevel.Beginner, QuickWatchFormat.Hex, null)]
256        public CryptoolStream InputStream
257        {
258            get 
259            {
260              if (inputStream != null)
261              {
262                CryptoolStream cs = new CryptoolStream();
263                cs.OpenRead(inputStream.FileName);
264                listCryptoolStreamsOut.Add(cs);
265                return cs;
266              }
267              else return null;
268            }
269            set 
270            { 
271              this.inputStream = value;
272              if (value != null) listCryptoolStreamsOut.Add(value);
273              OnPropertyChanged("InputStream");
274            }
275        }
276
277        [PropertyInfo(Direction.InputData, "Key", "The provided key should be 16, 24 or 32 bytes, dependig on the settings. Too short/long keys will be extended/truncated!", "", true, false, DisplayLevel.Beginner, QuickWatchFormat.Hex, null)]
278        public byte[] InputKey
279        {
280            get { return this.inputKey; }
281            set 
282            { 
283              this.inputKey = value;
284              OnPropertyChanged("InputKey");
285            }
286        }
287
288        [PropertyInfo(Direction.InputData, "IV", "The initialisation vector (IV) which is used in chaining modes. It always must be the same as the blocksize.", "", false, false, DisplayLevel.Professional, QuickWatchFormat.Hex, null)]
289        public byte[] InputIV
290        {
291            get { return this.inputIV; }
292            set 
293            { 
294              this.inputIV = value;
295              OnPropertyChanged("InputIV");
296            }
297        }
298
299        [PropertyInfo(Direction.OutputData, "Output stream", "Encrypted or decrypted output data", "", true, false, DisplayLevel.Beginner, QuickWatchFormat.Hex, null)]
300        public CryptoolStream OutputStream
301        {
302            get 
303            {
304              if (this.outputStream != null)
305              {
306                CryptoolStream cs = new CryptoolStream();
307                listCryptoolStreamsOut.Add(cs);
308                cs.OpenRead(this.outputStream.FileName);
309                return cs;
310              }
311              return null;
312            }
313            set 
314            {
315              outputStream = value;
316              if (value != null) listCryptoolStreamsOut.Add(value);
317              OnPropertyChanged("OutputStream");
318            }
319        }
320
321        private void ConfigureAlg(SymmetricAlgorithm alg)
322        {
323            // first set all paramter, then assign input values!
324            switch (settings.Mode)
325            { //0="ECB"=default, 1="CBC", 2="CFB", 3="OFB"
326                case 1: alg.Mode = CipherMode.CBC; break;
327                case 2: alg.Mode = CipherMode.CFB; break;
328                // case 3: alg.Mode = CipherMode.OFB; break;
329                default: alg.Mode = CipherMode.ECB; break;
330            }
331
332            switch (settings.Padding)
333            { //0="Zeros"=default, 1="None", 2="PKCS7" , 3="ANSIX923", 4="ISO10126"
334                case 1: alg.Padding = PaddingMode.None; break;
335                case 2: alg.Padding = PaddingMode.PKCS7; break;
336                case 3: alg.Padding = PaddingMode.ANSIX923; break;
337                case 4: alg.Padding = PaddingMode.ISO10126; break;
338                default: alg.Padding = PaddingMode.Zeros; break;
339            }
340            if (settings.CryptoAlgorithm == 1)
341            {
342                switch (settings.Blocksize)
343                {
344                    case 1: alg.BlockSize = 192; break;
345                    case 2: alg.BlockSize = 256; break;
346                    default:
347                        alg.BlockSize = 128;
348                        break;
349                }
350            }
351
352            //check for a valid key
353            if (this.inputKey == null)
354            {               
355                //create a trivial key
356                inputKey = new byte[16];
357                // write a warning to the ouside word
358                GuiLogMessage("WARNING - No key provided. Using 0x000..00!", NotificationLevel.Warning);
359            }
360
361            int keySizeInBytes = (16 + settings.Keysize * 8);
362
363            //prepare a long enough key
364            byte[] key = new byte[keySizeInBytes];
365
366            // copy the input key into the temporary key array
367            Array.Copy(inputKey, key, Math.Min(inputKey.Length, key.Length));
368
369            // Note: the SymmetricAlgorithm.Key setter clones the passed byte[] array and keeps his own copy
370            alg.Key = key;
371
372            if (inputKey.Length > keySizeInBytes)
373            {
374                GuiLogMessage("Overlength (" + inputKey.Length * 8 + " Bits) key provided. Removing trailing bytes to fit the desired key length of " + (keySizeInBytes * 8) + " Bits: " + bytesToHexString(key), NotificationLevel.Warning);
375            }
376
377            if (inputKey.Length < keySizeInBytes)
378            {
379                GuiLogMessage("Short (" + inputKey.Length * 8 + " Bits) key provided. Adding zero bytes to fill up to the desired key length of " + (keySizeInBytes * 8) + " Bits: " + bytesToHexString(key), NotificationLevel.Warning);
380            }
381
382            //check for a valid IV
383            if (this.inputIV == null)
384            {
385                //create a trivial key
386                inputIV = new byte[alg.BlockSize / 8];
387                GuiLogMessage("WARNING - No IV provided. Using 0x000..00!", NotificationLevel.Warning);
388            }
389            alg.IV = this.inputIV;
390        }
391
392        private string bytesToHexString(byte[] array)
393        {
394            StringBuilder sb = new StringBuilder();
395            foreach (byte b in array)
396            {
397                sb.Append(b.ToString("X2"));
398            }
399            return sb.ToString();
400        }
401
402        private void checkForInputStream()
403        {
404            if (settings.Action == 0 && (inputStream == null || (inputStream != null && inputStream.Length == 0)))
405            {
406                //create some input
407                String dummystring = "Dummy string - no input provided - \"Hello AES World\" - dummy string - no input provided!";
408                this.inputStream = new CryptoolStream();
409                this.inputStream.OpenRead(this.GetPluginInfoAttribute().Caption, Encoding.Default.GetBytes(dummystring.ToCharArray()));
410                // write a warning to the ouside word
411                GuiLogMessage("WARNING - No input provided. Using dummy data. (" + dummystring + ")", NotificationLevel.Warning);
412            }
413        }
414
415        public void Execute()
416        {           
417            process(settings.Action);
418        }
419
420        private void process(int action)
421        {
422            //Encrypt/Decrypt Stream
423          try
424          {
425            checkForInputStream();
426            if (inputStream == null || (inputStream != null && inputStream.Length == 0))
427            {
428              GuiLogMessage("No input given. Not using dummy data in decrypt mode. Aborting now.", NotificationLevel.Error);
429              return;
430            }
431
432            if (this.inputStream.CanSeek) this.inputStream.Position = 0;
433            SymmetricAlgorithm p_alg = null;
434            if (settings.CryptoAlgorithm == 1)
435            { p_alg = new RijndaelManaged(); }
436            else
437            { p_alg = new AesCryptoServiceProvider(); }
438
439            ConfigureAlg(p_alg);
440
441            ICryptoTransform p_encryptor = null;
442            switch (action)
443            {
444              case 0:
445                p_encryptor = p_alg.CreateEncryptor();
446                break;
447              case 1:
448                p_encryptor = p_alg.CreateDecryptor();
449                break;
450            }
451
452            outputStream = new CryptoolStream();
453            listCryptoolStreamsOut.Add(outputStream);
454            outputStream.OpenWrite(this.GetPluginInfoAttribute().Caption);
455            p_crypto_stream = new CryptoStream((Stream)inputStream, p_encryptor, CryptoStreamMode.Read);
456            byte[] buffer = new byte[p_alg.BlockSize / 8];
457            int bytesRead;
458            int position = 0;
459            string mode = action == 0 ? "encryption" : "decryption";
460            GuiLogMessage("Starting " + mode + " [Keysize=" + p_alg.KeySize.ToString() + " Bits, Blocksize=" + p_alg.BlockSize.ToString() + " Bits]", NotificationLevel.Info);
461            DateTime startTime = DateTime.Now;
462            while ((bytesRead = p_crypto_stream.Read(buffer, 0, buffer.Length)) > 0 && !stop)
463            {
464              outputStream.Write(buffer, 0, bytesRead);
465
466              if ((int)(inputStream.Position * 100 / inputStream.Length) > position)
467              {
468                position = (int)(inputStream.Position * 100 / inputStream.Length);
469                ProgressChanged(inputStream.Position, inputStream.Length);
470              }
471            }
472
473
474            long outbytes = outputStream.Length;
475            p_crypto_stream.Flush();           
476            // p_crypto_stream.Close();
477            DateTime stopTime = DateTime.Now;
478            TimeSpan duration = stopTime - startTime;
479            // (outputStream as CryptoolStream).FinishWrite();
480
481            if (!stop)
482            {
483                mode = action == 0 ? "Encryption" : "Decryption";
484                GuiLogMessage(mode + " complete! (in: " + inputStream.Length.ToString() + " bytes, out: " + outbytes.ToString() + " bytes)", NotificationLevel.Info);
485                GuiLogMessage("Wrote data to file: " + outputStream.FileName, NotificationLevel.Info);
486                GuiLogMessage("Time used: " + duration.ToString(), NotificationLevel.Debug);
487                outputStream.Close();
488                OnPropertyChanged("OutputStream");
489            }
490            CryptoolStream test = outputStream;
491            if (stop)
492            {
493                outputStream.Close();
494                GuiLogMessage("Aborted!", NotificationLevel.Info);
495            }
496          }
497          catch (CryptographicException cryptographicException)
498          {
499            // TODO: For an unknown reason p_crypto_stream can not be closed after exception.
500            // Trying so makes p_crypto_stream throw the same exception again. So in Dispose
501            // the error messages will be doubled.
502            // As a workaround we set p_crypto_stream to null here.
503            p_crypto_stream = null;
504            GuiLogMessage(cryptographicException.Message, NotificationLevel.Error);
505          }
506          catch (Exception exception)
507          {
508            GuiLogMessage(exception.Message, NotificationLevel.Error);
509          }
510          finally
511          {
512              ProgressChanged(1, 1);
513          }
514        }
515
516        public void Encrypt()
517        {
518            //Encrypt Stream
519            process(0);
520        }
521       
522        public void Decrypt()
523        {
524            //Decrypt Stream
525            process(1);
526        }
527
528        #region IPlugin Member
529
530
531        public System.Windows.Controls.UserControl Presentation
532        {
533          get { return null; }
534        }
535
536        public UserControl QuickWatchPresentation
537        {
538          get { return null; }
539        }
540
541        public void Initialize()
542        {           
543        }
544
545        public void Dispose()
546        {
547          try
548          {
549            stop = false;
550            inputKey = null;
551            inputIV = null;
552            outputStream = null;
553            inputStream = null;
554
555            //if (inputStream != null)
556            //{
557            //  inputStream.Flush();
558            //  inputStream.Close();
559            //  inputStream = null;
560            //}
561            //if (outputStream != null)
562            //{
563            //  outputStream.Flush();
564            //  outputStream.Close();
565            //  outputStream = null;
566            //}
567            foreach (CryptoolStream stream in listCryptoolStreamsOut)
568            {
569              stream.Close();
570            }
571            listCryptoolStreamsOut.Clear();
572
573            if (p_crypto_stream != null)
574            {
575              p_crypto_stream.Flush();
576              p_crypto_stream.Close();
577              p_crypto_stream = null;
578            }
579          }
580          catch (Exception ex)
581          {         
582             GuiLogMessage(ex.Message, NotificationLevel.Error);
583          }
584          this.stop = false;
585        }
586
587        public void Stop()
588        {
589          this.stop = true;
590        }
591
592        public void PostExecution()
593        {
594          Dispose();
595        }
596
597        public void PreExecution()
598        {
599          Dispose();
600        }
601
602        #endregion
603
604        #region INotifyPropertyChanged Members
605
606        public event PropertyChangedEventHandler PropertyChanged;
607
608        public void OnPropertyChanged(string name)
609        {
610          EventsHelper.PropertyChanged(PropertyChanged, this, new PropertyChangedEventArgs(name));
611          //if (PropertyChanged != null)
612          //{
613          //  PropertyChanged(this, new PropertyChangedEventArgs(name));
614          //}
615        }
616
617        #endregion
618
619        #region IPlugin Members
620
621        public event StatusChangedEventHandler OnPluginStatusChanged;       
622
623        public event GuiLogNotificationEventHandler OnGuiLogNotificationOccured;
624        private void GuiLogMessage(string message, NotificationLevel logLevel)
625        {
626          EventsHelper.GuiLogMessage(OnGuiLogNotificationOccured, this, new GuiLogEventArgs(message, this, logLevel));
627        }
628
629        public event PluginProgressChangedEventHandler OnPluginProgressChanged;
630        private void ProgressChanged(double value, double max)
631        {
632          EventsHelper.ProgressChanged(OnPluginProgressChanged, this, new PluginProgressEventArgs(value, max));
633        }
634       
635        public void Pause()
636        {
637         
638        }
639
640        #endregion
641
642        private IControlEncryption controlSlave;
643        [PropertyInfo(Direction.ControlSlave, "AES Slave", "AES Slave", "", DisplayLevel.Experienced)]
644        public IControlEncryption ControlSlave
645        {
646          get 
647          {
648              if (controlSlave == null)
649                  controlSlave = new AESControl(this);
650              return controlSlave; 
651          }
652        }     
653    }
654
655    public class AESControl : IControlEncryption
656    {
657        public event KeyPatternChanged keyPatternChanged;
658        public event IControlStatusChangedEventHandler OnStatusChanged;
659        private AES plugin;
660
661        public AESControl(AES Plugin)
662        {
663            this.plugin = Plugin;
664            ((AESSettings)plugin.Settings).PropertyChanged += settingsChangedHandler;
665        }
666
667        #region IControlEncryption Members
668
669        public byte[] Encrypt(byte[] key, int blocksize)
670        {
671            ((AESSettings)plugin.Settings).Action = 0;
672            return execute(key, blocksize);
673        }
674
675        public byte[] Decrypt(byte[] key, int blocksize)
676        {
677            ((AESSettings)plugin.Settings).Action = 1;
678            return execute(key, blocksize);
679        }
680
681        public string getKeyPattern()
682        {
683            int bytes = 0;
684            switch (((AESSettings)plugin.Settings).Keysize)
685            {
686                case 0:
687                    bytes = 16;
688                    break;
689                case 1:
690                    bytes = 24;
691                    break;
692                case 2:
693                    bytes = 32;
694                    break;
695            }
696            string pattern = "";
697            for (int i = 1; i < bytes; i++)
698                pattern += "[0-9A-F][0-9A-F]-";
699            pattern += "[0-9A-F][0-9A-F]";
700            return pattern;
701        }
702
703        public byte[] getKeyFromString(string key)
704        {
705            int bytes = 0;
706            switch (((AESSettings)plugin.Settings).Keysize)
707            {
708                case 0:
709                    bytes = 16;
710                    break;
711                case 1:
712                    bytes = 24;
713                    break;
714                case 2:
715                    bytes = 32;
716                    break;
717            }
718            byte[] bkey = new byte[bytes];
719            for (int i = 0; i < bytes; i++)
720            {
721                bkey[i] = Convert.ToByte(key.Substring(i * 3, 2), 16);
722            }
723            return bkey;
724        }
725
726        private byte[] execute(byte[] key, int blocksize)
727        {
728            plugin.InputKey = key;
729            plugin.Execute();
730            CryptoolStream output = plugin.OutputStream;
731
732            byte[] byteValues = new byte[output.Length];
733            int bytesRead;
734            output.Seek(0, SeekOrigin.Begin);
735            bytesRead = output.Read(byteValues, 0, byteValues.Length);
736            plugin.Dispose();
737            output.Close();
738            return byteValues;
739        }
740
741        private void settingsChangedHandler(object sender, PropertyChangedEventArgs e)
742        {
743            if (e.PropertyName == "Keysize")
744                keyPatternChanged();
745        }
746
747        #endregion
748    }
749}
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