Can't decrypt encrypted(xor) file. #32
Description
- I have encrypted a pdf in python.
- I need to decrypt and view it in flutter app and so I used this package.
my python 3 script:
from itertools import cycle
def xor_crypt(data, key):
return ''.join(chr(a ^ ord(b)) for (a, b) in zip(data, cycle(key)))
with open('math.pdf', 'rb') as encry, open('xor_math.pdf', 'w') as decry:
decry.write(xor_crypt(encry.read(), 'abcd'))
encry.close()
decry.close()
Normal File:
math.pdf
Encrypted File:
xor_math.pdf
Encryption key : 'abcd'
I cloned the example app and pasted the encrypted file(xor_math.pdf) in asset and changed the file name in code as shown below.
I got this error
D/PluginScaffold(31704): invoke { channel: com.pycampers.flutter_pdf_viewer, method: launchPdfActivity(), args: {pageSnap=false, enableImmersive=false, src=assets/xor_math.pdf, pageFling=false, xorDecryptKey=abcd, mode=fromAsset, password=null, autoSpacing=false, initialPage=null, pages=null, pdfId=dd68e353b2390617cff7bf7776677545b583b9ce, enableSwipe=true, autoPlay=false, videoPages={8={mode=fromAsset, src=assets/xor_buck_bunny.mp4, xorDecryptKey=abcd}, 9={mode=fromAsset, src=assets/xor_buck_bunny.mp4, xorDecryptKey=abcd}}, forceLandscape=false, nightMode=false, swipeHorizontal=false} }
I/Timeline(31704): Timeline: Activity_launch_request time:264188741 intent:Intent { cmp=com.pycampers.flutterpdfviewerexample/com.pycampers.flutterpdfviewer.PdfActivity (has extras) }
W/ActivityThread(31704): handleWindowVisibility: no activity for token android.os.BinderProxy@8f4b2ab
D/com.shockwave.pdfium.PdfiumCore(31704): Starting PdfiumAndroid 1.9.0
D/FlutterPdfViewer(31704): loading encrypted pdf from assets { flutter_assets/assets/xor_math.pdf }...
I/dfviewerexampl(31704): Compiler allocated 4MB to compile void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
I/flutter (31704): analyticsCallback: { pdfId: dd68e353b2390617cff7bf7776677545b583b9ce, pageIndex: 0, paused: false }
D/jniPdfium(31704): Init FPDF library
D/jniPdfium(31704): Destroy FPDF library
D/FlutterPdfViewer(31704): encountered error: java.io.IOException: cannot create document: File not in PDF format or corrupted.
W/System.err(31704): java.io.IOException: cannot create document: File not in PDF format or corrupted.
W/System.err(31704): at com.shockwave.pdfium.PdfiumCore.nativeOpenMemDocument(Native Method)
W/System.err(31704): at com.shockwave.pdfium.PdfiumCore.newDocument(PdfiumCore.java:150)
W/System.err(31704): at com.github.barteksc.pdfviewer.source.ByteArraySource.createDocument(ByteArraySource.java:35)
W/System.err(31704): at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:49)
W/System.err(31704): at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:25)
W/System.err(31704): at android.os.AsyncTask$2.call(AsyncTask.java:333)
W/System.err(31704): at java.util.concurrent.FutureTask.run(FutureTask.java:266)
W/System.err(31704): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/System.err(31704): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/System.err(31704): at java.lang.Thread.run(Thread.java:764)
D/PluginScaffold(31704): piping exception to flutter (java.io.IOException)
E/flutter (31704): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: PlatformException(java.io.IOException, cannot create document: File not in PDF format or corrupted., java.io.IOException: cannot create document: File not in PDF format or corrupted.
E/flutter (31704): at com.shockwave.pdfium.PdfiumCore.nativeOpenMemDocument(Native Method)
E/flutter (31704): at com.shockwave.pdfium.PdfiumCore.newDocument(PdfiumCore.java:150)
E/flutter (31704): at com.github.barteksc.pdfviewer.source.ByteArraySource.createDocument(ByteArraySource.java:35)
E/flutter (31704): at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:49)
E/flutter (31704): at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:25)
E/flutter (31704): at android.os.AsyncTask$2.call(AsyncTask.java:333)
E/flutter (31704): at java.util.concurrent.FutureTask.run(FutureTask.java:266)
E/flutter (31704): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/flutter (31704): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/flutter (31704): at java.lang.Thread.run(Thread.java:764)
E/flutter (31704): )
E/flutter (31704): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7)
E/flutter (31704): #1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:316:33)
E/flutter (31704): <asynchronous suspension>
E/flutter (31704): #2 PdfViewer._launchPdfActivity (package:flutter_pdf_viewer/flutter_pdf_viewer.dart:263:19)
E/flutter (31704): <asynchronous suspension>
E/flutter (31704): #3 PdfViewer.loadAsset (package:flutter_pdf_viewer/flutter_pdf_viewer.dart:314:18)
E/flutter (31704): <asynchronous suspension>
E/flutter (31704): #4 PdfLoaderSectionState.onPressed (package:flutter_pdf_viewer_example/main.dart:112:25)
E/flutter (31704): <asynchronous suspension>
E/flutter (31704): #5 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:654:14)
E/flutter (31704): #6 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:729:32)
E/flutter (31704): #7 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter (31704): #8 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:365:11)
E/flutter (31704): #9 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:312:7)
E/flutter (31704): #10 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (31704): #11 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:222:20)
E/flutter (31704): #12 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
E/flutter (31704): #13 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
E/flutter (31704): #14 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter (31704): #15 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter (31704): #16 _rootRunUnary (dart:async/zone.dart:1136:13)
E/flutter (31704): #17 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (31704): #18 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
E/flutter (31704): #19 _invoke1 (dart:ui/hooks.dart:263:10)
E/flutter (31704): #20 _dispatchPointerDataPacket (dart:ui/hooks.dart:172:5)
E/flutter (31704):
I/flutter (31704): analyticsCallback: { pdfId: dd68e353b2390617cff7bf7776677545b583b9ce, pageIndex: 0, paused: true }
I/System.out(31704): atExit!