source: trunk/CrypPlugins/AES/AES.cs @ 822

Last change on this file since 822 was 822, checked in by Sven Rech, 12 years ago

small keysearcher fixes

File size: 36.1 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;
219using System.Reflection;
220
221namespace Cryptool.Plugins.Cryptography.Encryption
222{
223    [Author("Dr. Arno Wacker", "arno.wacker@cryptool.org", "Uni Duisburg", "http://www.uni-duisburg-essen.de")]
224    [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")]
225    [EncryptionType(EncryptionType.SymmetricBlock)]
226    public class AES : ContextBoundObject, IEncryption
227    {
228        #region Private variables
229        private AESSettings settings;
230        private CryptoolStream inputStream;
231        private CryptoolStream outputStream;
232        private byte[] inputKey;
233        private byte[] inputIV;
234        private CryptoStream p_crypto_stream;
235        private bool stop = false;
236        private List<CryptoolStream> listCryptoolStreamsOut = new List<CryptoolStream>();
237        #endregion
238
239        public AES()
240        {
241            this.settings = new AESSettings();
242            this.settings.OnPluginStatusChanged += settings_OnPluginStatusChanged;
243        }
244
245        void settings_OnPluginStatusChanged(IPlugin sender, StatusEventArgs args)
246        {
247          if (OnPluginStatusChanged != null) OnPluginStatusChanged(this, args);
248        }
249
250        public ISettings Settings
251        {
252            get { return this.settings; }
253            set { this.settings = (AESSettings)value; }
254        }
255
256        [PropertyInfo(Direction.InputData, "Input", "Data to be encrypted or decrypted", "", true, false, DisplayLevel.Beginner, QuickWatchFormat.Hex, null)]
257        public CryptoolStream InputStream
258        {
259            get 
260            {
261              if (inputStream != null)
262              {
263                CryptoolStream cs = new CryptoolStream();
264                cs.OpenRead(inputStream.FileName);
265                listCryptoolStreamsOut.Add(cs);
266                return cs;
267              }
268              else return null;
269            }
270            set 
271            { 
272              this.inputStream = value;
273              if (value != null) listCryptoolStreamsOut.Add(value);
274              OnPropertyChanged("InputStream");
275            }
276        }
277
278        [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)]
279        public byte[] InputKey
280        {
281            get { return this.inputKey; }
282            set 
283            { 
284              this.inputKey = value;
285              OnPropertyChanged("InputKey");
286            }
287        }
288
289        [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)]
290        public byte[] InputIV
291        {
292            get { return this.inputIV; }
293            set 
294            { 
295              this.inputIV = value;
296              OnPropertyChanged("InputIV");
297            }
298        }
299
300        [PropertyInfo(Direction.OutputData, "Output stream", "Encrypted or decrypted output data", "", true, false, DisplayLevel.Beginner, QuickWatchFormat.Hex, null)]
301        public CryptoolStream OutputStream
302        {
303            get 
304            {
305              if (this.outputStream != null)
306              {
307                CryptoolStream cs = new CryptoolStream();
308                listCryptoolStreamsOut.Add(cs);
309                cs.OpenRead(this.outputStream.FileName);
310                return cs;
311              }
312              return null;
313            }
314            set 
315            {
316              outputStream = value;
317              if (value != null) listCryptoolStreamsOut.Add(value);
318              OnPropertyChanged("OutputStream");
319            }
320        }
321
322        private void ConfigureAlg(SymmetricAlgorithm alg)
323        {
324            // first set all paramter, then assign input values!
325            switch (settings.Mode)
326            { //0="ECB"=default, 1="CBC", 2="CFB", 3="OFB"
327                case 1: alg.Mode = CipherMode.CBC; break;
328                case 2: alg.Mode = CipherMode.CFB; break;
329                // case 3: alg.Mode = CipherMode.OFB; break;
330                default: alg.Mode = CipherMode.ECB; break;
331            }
332
333            switch (settings.Padding)
334            { //0="Zeros"=default, 1="None", 2="PKCS7" , 3="ANSIX923", 4="ISO10126"
335                case 1: alg.Padding = PaddingMode.None; break;
336                case 2: alg.Padding = PaddingMode.PKCS7; break;
337                case 3: alg.Padding = PaddingMode.ANSIX923; break;
338                case 4: alg.Padding = PaddingMode.ISO10126; break;
339                default: alg.Padding = PaddingMode.Zeros; break;
340            }
341            if (settings.CryptoAlgorithm == 1)
342            {
343                switch (settings.Blocksize)
344                {
345                    case 1: alg.BlockSize = 192; break;
346                    case 2: alg.BlockSize = 256; break;
347                    default:
348                        alg.BlockSize = 128;
349                        break;
350                }
351            }
352
353            //check for a valid key
354            if (this.inputKey == null)
355            {               
356                //create a trivial key
357                inputKey = new byte[16];
358                // write a warning to the ouside word
359                GuiLogMessage("WARNING - No key provided. Using 0x000..00!", NotificationLevel.Warning);
360            }
361
362            int keySizeInBytes = (16 + settings.Keysize * 8);
363
364            //prepare a long enough key
365            byte[] key = new byte[keySizeInBytes];
366
367            // copy the input key into the temporary key array
368            Array.Copy(inputKey, key, Math.Min(inputKey.Length, key.Length));
369
370            // Note: the SymmetricAlgorithm.Key setter clones the passed byte[] array and keeps his own copy
371            alg.Key = key;
372
373            if (inputKey.Length > keySizeInBytes)
374            {
375                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);
376            }
377
378            if (inputKey.Length < keySizeInBytes)
379            {
380                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);
381            }
382
383            //check for a valid IV
384            if (this.inputIV == null)
385            {
386                //create a trivial key
387                inputIV = new byte[alg.BlockSize / 8];
388                GuiLogMessage("WARNING - No IV provided. Using 0x000..00!", NotificationLevel.Warning);
389            }
390            alg.IV = this.inputIV;
391        }
392
393        private string bytesToHexString(byte[] array)
394        {
395            StringBuilder sb = new StringBuilder();
396            foreach (byte b in array)
397            {
398                sb.Append(b.ToString("X2"));
399            }
400            return sb.ToString();
401        }
402
403        private void checkForInputStream()
404        {
405            if (settings.Action == 0 && (inputStream == null || (inputStream != null && inputStream.Length == 0)))
406            {
407                //create some input
408                String dummystring = "Dummy string - no input provided - \"Hello AES World\" - dummy string - no input provided!";
409                this.inputStream = new CryptoolStream();
410                this.inputStream.OpenRead(this.GetPluginInfoAttribute().Caption, Encoding.Default.GetBytes(dummystring.ToCharArray()));
411                // write a warning to the ouside word
412                GuiLogMessage("WARNING - No input provided. Using dummy data. (" + dummystring + ")", NotificationLevel.Warning);
413            }
414        }
415
416        public void Execute()
417        {
418            try
419            {
420                //copy inputStream for Slave
421                if (controlSlave is object && InputStream is object && InputIV is object)
422                {
423                    CryptoolStream cs = new CryptoolStream();
424                    cs.OpenRead(inputStream.FileName);
425                    ((AESControl)controlSlave).InputStream = cs;
426                }
427
428                process(settings.Action);
429
430                //Work with slave
431                if (controlSlave is object && InputStream is object && InputIV is object)
432                {
433                    ((AESControl)controlSlave).reset();
434                    ((AESControl)controlSlave).onStatusChanged();
435
436                }
437            }
438            finally
439            {
440                if (controlSlave is object && ((AESControl)controlSlave).InputStream is object)
441                    ((AESControl)controlSlave).closeStreams();
442            }
443        }
444
445        public bool isStopped()
446        {
447
448            return this.stop;
449        }
450
451        private void process(int action)
452        {
453            //Encrypt/Decrypt Stream
454          try
455          {
456            checkForInputStream();
457            if (inputStream == null || inputStream.Length == 0)
458            {
459              GuiLogMessage("No input given. Not using dummy data in decrypt mode. Aborting now.", NotificationLevel.Error);
460              return;
461            }
462
463            if (this.inputStream.CanSeek) this.inputStream.Position = 0;
464            SymmetricAlgorithm p_alg = null;
465            if (settings.CryptoAlgorithm == 1)
466            { p_alg = new RijndaelManaged(); }
467            else
468            { p_alg = new AesCryptoServiceProvider(); }
469
470            ConfigureAlg(p_alg);
471
472            ICryptoTransform p_encryptor = null;
473            switch (action)
474            {
475              case 0:
476                p_encryptor = p_alg.CreateEncryptor();
477                break;
478              case 1:
479                p_encryptor = p_alg.CreateDecryptor();
480                break;
481            }
482
483            outputStream = new CryptoolStream();
484            listCryptoolStreamsOut.Add(outputStream);
485            outputStream.OpenWrite(this.GetPluginInfoAttribute().Caption);
486            p_crypto_stream = new CryptoStream((Stream)inputStream, p_encryptor, CryptoStreamMode.Read);
487            byte[] buffer = new byte[p_alg.BlockSize / 8];
488            int bytesRead;
489            int position = 0;
490            string mode = action == 0 ? "encryption" : "decryption";
491            GuiLogMessage("Starting " + mode + " [Keysize=" + p_alg.KeySize.ToString() + " Bits, Blocksize=" + p_alg.BlockSize.ToString() + " Bits]", NotificationLevel.Info);
492            DateTime startTime = DateTime.Now;
493            while ((bytesRead = p_crypto_stream.Read(buffer, 0, buffer.Length)) > 0 && !stop)
494            {
495              outputStream.Write(buffer, 0, bytesRead);
496
497              if ((int)(inputStream.Position * 100 / inputStream.Length) > position)
498              {
499                position = (int)(inputStream.Position * 100 / inputStream.Length);
500                ProgressChanged(inputStream.Position, inputStream.Length);
501              }
502            }
503
504
505            long outbytes = outputStream.Length;
506            p_crypto_stream.Flush();           
507            // p_crypto_stream.Close();
508            DateTime stopTime = DateTime.Now;
509            TimeSpan duration = stopTime - startTime;
510            // (outputStream as CryptoolStream).FinishWrite();
511
512            if (!stop)
513            {
514                mode = action == 0 ? "Encryption" : "Decryption";
515                GuiLogMessage(mode + " complete! (in: " + inputStream.Length.ToString() + " bytes, out: " + outbytes.ToString() + " bytes)", NotificationLevel.Info);
516                GuiLogMessage("Wrote data to file: " + outputStream.FileName, NotificationLevel.Info);
517                GuiLogMessage("Time used: " + duration.ToString(), NotificationLevel.Debug);
518                outputStream.Close();
519                OnPropertyChanged("OutputStream");
520            }
521            CryptoolStream test = outputStream;
522            if (stop)
523            {
524                outputStream.Close();
525                GuiLogMessage("Aborted!", NotificationLevel.Info);
526            }
527          }
528          catch (CryptographicException cryptographicException)
529          {
530            // TODO: For an unknown reason p_crypto_stream can not be closed after exception.
531            // Trying so makes p_crypto_stream throw the same exception again. So in Dispose
532            // the error messages will be doubled.
533            // As a workaround we set p_crypto_stream to null here.
534            p_crypto_stream = null;
535            GuiLogMessage(cryptographicException.Message, NotificationLevel.Error);
536          }
537          catch (Exception exception)
538          {
539            GuiLogMessage(exception.Message, NotificationLevel.Error);
540          }
541          finally
542          {
543              ProgressChanged(1, 1);
544          }
545        }
546
547        public void Encrypt()
548        {
549            //Encrypt Stream
550            process(0);
551        }
552       
553        public void Decrypt()
554        {
555            //Decrypt Stream
556            process(1);
557        }
558
559        #region IPlugin Member
560
561
562        public System.Windows.Controls.UserControl Presentation
563        {
564          get { return null; }
565        }
566
567        public UserControl QuickWatchPresentation
568        {
569          get { return null; }
570        }
571
572        public void Initialize()
573        {           
574        }
575
576        public void Dispose()
577        {
578          try
579          {
580            stop = false;
581            inputKey = null;
582            inputIV = null;
583            outputStream = null;
584            inputStream = null;
585
586            //if (inputStream != null)
587            //{
588            //  inputStream.Flush();
589            //  inputStream.Close();
590            //  inputStream = null;
591            //}
592            //if (outputStream != null)
593            //{
594            //  outputStream.Flush();
595            //  outputStream.Close();
596            //  outputStream = null;
597            //}
598            foreach (CryptoolStream stream in listCryptoolStreamsOut)
599            {
600              stream.Close();
601            }
602            listCryptoolStreamsOut.Clear();
603
604            if (p_crypto_stream != null)
605            {
606              p_crypto_stream.Flush();
607              p_crypto_stream.Close();
608              p_crypto_stream = null;
609            }
610          }
611          catch (Exception ex)
612          {         
613             GuiLogMessage(ex.Message, NotificationLevel.Error);
614          }
615          this.stop = false;
616        }
617
618        public void Stop()
619        {
620          this.stop = true;
621        }
622
623        public void PostExecution()
624        {
625          Dispose();
626        }
627
628        public void PreExecution()
629        {
630          Dispose();
631        }
632
633        #endregion
634
635        #region INotifyPropertyChanged Members
636
637        public event PropertyChangedEventHandler PropertyChanged;
638
639        public void OnPropertyChanged(string name)
640        {
641          EventsHelper.PropertyChanged(PropertyChanged, this, new PropertyChangedEventArgs(name));
642          //if (PropertyChanged != null)
643          //{
644          //  PropertyChanged(this, new PropertyChangedEventArgs(name));
645          //}
646        }
647
648        #endregion
649
650        #region IPlugin Members
651
652        public event StatusChangedEventHandler OnPluginStatusChanged;       
653
654        public event GuiLogNotificationEventHandler OnGuiLogNotificationOccured;
655        private void GuiLogMessage(string message, NotificationLevel logLevel)
656        {
657          EventsHelper.GuiLogMessage(OnGuiLogNotificationOccured, this, new GuiLogEventArgs(message, this, logLevel));
658        }
659
660        public event PluginProgressChangedEventHandler OnPluginProgressChanged;
661        private void ProgressChanged(double value, double max)
662        {
663          EventsHelper.ProgressChanged(OnPluginProgressChanged, this, new PluginProgressEventArgs(value, max));
664        }
665       
666        public void Pause()
667        {
668         
669        }
670
671        #endregion
672
673        private IControlEncryption controlSlave;
674        [PropertyInfo(Direction.ControlSlave, "AES Slave", "AES Slave", "", DisplayLevel.Experienced)]
675        public IControlEncryption ControlSlave
676        {
677          get 
678          {
679              if (controlSlave == null)
680                  controlSlave = new AESControl(this);
681              return controlSlave; 
682          }
683        }     
684    }
685
686    public class AESControl : IControlEncryption
687    {
688        public event KeyPatternChanged keyPatternChanged;
689        public event IControlStatusChangedEventHandler OnStatusChanged;
690        private AES plugin;
691        private SymmetricAlgorithm aes_algorithm = null;
692        private byte[] input;
693        private Stream inputStream;
694
695        public void reset()
696        {
697            input = null;
698            aes_algorithm = null;
699        }
700
701        public CryptoolStream InputStream{
702            get;set;
703        }
704
705        public AESControl(AES Plugin)
706        {
707            this.plugin = Plugin;
708        }
709
710        #region IControlEncryption Members
711
712        public byte[] Encrypt(byte[] key, int blocksize)
713        {
714            /// not implemented, currently not needed
715            return null;
716        }
717
718        public void closeStreams()
719        {
720            if (inputStream != null)
721                inputStream.Close();
722            if (InputStream != null)
723                InputStream.Close();
724        }
725
726        public byte[] Decrypt(byte[] key, int blocksize)
727        {
728            int size = (int)this.InputStream.Length;
729           
730            if (blocksize < size)
731                size = blocksize;
732           
733            if (!(this.input is object))
734            {
735                input = new byte[size];
736                this.InputStream.Seek(0, 0);
737                for (int i = 0; i < size && i < this.InputStream.Length; i++)
738                    input[i] = (byte)this.InputStream.ReadByte();
739                inputStream = new MemoryStream(input); 
740            }
741            inputStream.Seek(0, 0);
742
743            CryptoStream crypto_stream = null;
744            byte[] output = new byte[blocksize];
745
746            //Decrypt Stream
747            try
748            {
749                if (!(aes_algorithm is object))
750                {
751                    if (((AESSettings)plugin.Settings).CryptoAlgorithm == 1)
752                    { aes_algorithm = new RijndaelManaged(); }
753                    else
754                    { aes_algorithm = new AesCryptoServiceProvider(); }                   
755                }
756               
757                this.ConfigureAlg(aes_algorithm, key);
758               
759                ICryptoTransform p_decryptor;
760                try
761                {
762                    p_decryptor = aes_algorithm.CreateDecryptor();
763                }               
764                catch
765                {
766                    //dirty hack to allow weak keys:
767                    MethodInfo mi = aes_algorithm.GetType().GetMethod("_NewEncryptor", BindingFlags.NonPublic | BindingFlags.Instance);
768                    object[] Par = { aes_algorithm.Key, aes_algorithm.Mode, aes_algorithm.IV, aes_algorithm.FeedbackSize, 0 };
769                    p_decryptor = mi.Invoke(aes_algorithm, Par) as ICryptoTransform;
770                }
771
772                crypto_stream = new CryptoStream((Stream)inputStream, p_decryptor, CryptoStreamMode.Read);
773
774                byte[] buffer = new byte[aes_algorithm.BlockSize / 8];
775                int bytesRead;
776                int position = 0;
777
778                while ((bytesRead = crypto_stream.Read(buffer, 0, buffer.Length)) > 0 && !plugin.isStopped())
779                {
780                    for (int i = 0; i < bytesRead; i++)
781                    {
782                        if (position + i < output.Length)
783                        {
784                            output[position + i] = buffer[i];
785                        }
786                        else
787                        {
788                            break;
789                        }
790                    }                   
791                    position += bytesRead;
792                }
793
794            }
795            catch (Exception exception)
796            {
797                aes_algorithm = null;   // we got an exception so we do not use this object any more
798                throw exception;
799            }           
800
801            return output;
802        }
803
804        private void ConfigureAlg(SymmetricAlgorithm alg, byte[] key)
805        {
806            try
807            {
808                alg.Key = key;
809            }
810            catch
811            {
812                //dirty hack to allow weak keys:
813                FieldInfo field = aes_algorithm.GetType().GetField("KeyValue", BindingFlags.NonPublic | BindingFlags.Instance);
814                field.SetValue(alg, key);
815            }
816
817            try
818            {
819                alg.IV = this.plugin.InputIV;
820            }
821            catch
822            {
823                //dirty hack to allow weak keys:
824                FieldInfo field = aes_algorithm.GetType().GetField("IVValue", BindingFlags.NonPublic | BindingFlags.Instance);
825                field.SetValue(alg, this.plugin.InputIV);
826            }
827
828            switch (((AESSettings)plugin.Settings).Mode)
829            { //0="ECB"=default, 1="CBC", 2="CFB", 3="OFB"
830                case 1: alg.Mode = CipherMode.CBC; break;
831                case 2: alg.Mode = CipherMode.CFB; break;
832                case 3: alg.Mode = CipherMode.OFB; break;
833                default: alg.Mode = CipherMode.ECB; break;
834            }
835            switch (((AESSettings)plugin.Settings).Padding)
836            { //0="Zeros"=default, 1="None", 2="PKCS7"
837                case 1: alg.Padding = PaddingMode.None; break;
838                case 2: alg.Padding = PaddingMode.PKCS7; break;
839                case 3: alg.Padding = PaddingMode.ANSIX923; break;
840                case 4: alg.Padding = PaddingMode.ISO10126; break;
841                default: alg.Padding = PaddingMode.Zeros; break;
842            }
843           
844        }
845
846        /// <summary>
847        /// Called by AES if its status changes
848        /// </summary>
849        public void onStatusChanged()
850        {
851            if (OnStatusChanged != null)
852                OnStatusChanged(this, true);
853        }
854
855        public string getKeyPattern()
856        {
857            int bytes = 0;
858            switch (((AESSettings)plugin.Settings).Keysize)
859            {
860                case 0:
861                    bytes = 16;
862                    break;
863                case 1:
864                    bytes = 24;
865                    break;
866                case 2:
867                    bytes = 32;
868                    break;
869            }
870            string pattern = "";
871            for (int i = 1; i < bytes; i++)
872                pattern += "[0-9A-F][0-9A-F]-";
873            pattern += "[0-9A-F][0-9A-F]";
874            return pattern;
875        }
876
877        public byte[] getKeyFromString(string key)
878        {
879            int bytes = 0;
880            switch (((AESSettings)plugin.Settings).Keysize)
881            {
882                case 0:
883                    bytes = 16;
884                    break;
885                case 1:
886                    bytes = 24;
887                    break;
888                case 2:
889                    bytes = 32;
890                    break;
891            }
892            byte[] bkey = new byte[bytes];
893            for (int i = 0; i < bytes; i++)
894            {
895                try
896                {
897                    bkey[i] = Convert.ToByte(key.Substring(i * 3, 2), 16);
898                }
899                catch (Exception ex)
900                {
901                    return null;
902                }
903            }
904            return bkey;
905        }
906
907        public IControlEncryption clone()
908        {
909            AESControl aes = new AESControl(plugin);
910            CryptoolStream cs = new CryptoolStream();
911            cs.OpenRead(InputStream.FileName);
912            aes.InputStream = cs;
913            aes.reset();
914            return aes;
915        }
916
917        public void Dispose()
918        {
919            closeStreams();
920        }
921
922        #endregion
923    }
924}
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