Is there any simple way of generating (and checking) MD5 checksums of a list of files in Python? (I have a small program I'm working on, and I'd like to confirm the checksums of the files).
Will changing a file name effect the MD5 Hash of a file?
I recently found that
md5 hashes on large
R objects using the
digest package did not change when making small changes. This appears to be due to some 32 bit counter variables getting overflowed and the algorithm missing the changed portion of the file.
Using the current development version of
digest on Linux, hashes notice these small changes on large files whereas on Windows, these small changes get missed.
I made the following changes to the current dev version, which swaps a few
unsigned long int (
unit32) variables for
unsigned long long int (
and now on Windows the problem is fixed and the hashes notice the changes.
Is swapping out these 32-bit integer variables for 64-bit integer variables benign? Will anything get ruined on 32-bit systems? On obscure systems? Can anything go wrong?
I am new to Python so I decided to make a little project that downloads some files off a server. Everything working great, I decided to check the integrity of the files downloaded by generating the MD5 and comparing with the server's MD5. The problem is, it does not always work. Sometimes with some files it's able to generate the correct MD5, but most (about 80%) of the generated MD5s do not match the server's.
I tried many different examples that I could find to generate MD5s but all of them produce the same result.
Note: I am reading the file in 64kB chunks because I am kind of resource-limited (running the script on a Raspberry Pi), so I thought that would be a good idea to do this. And yes, I already tried loading the file all at once – same result.
def md5_check(self, file_path, original_md5): calculated_md5 = hashlib.md5() with open(file_path, "rb") as file: while True: chunk = file.read(65536) #The downloaded file will be read in 64kB chunks if not chunk: break calculated_md5.update(chunk) calculated_md5 = calculated_md5.hexdigest()
I'm doing a QC check on my finished md5 malware scanner using a Hyper-V VM running Windows 10. The scanner didn't remove the malware samples supplied from https://virusshare.com which hashes were contained in the scanner database and were up-to-date.
I've already tried reverting into the original SachaDee's code, but it didn't work. It is probably due to environment variables improperly set somewhere.
:MD5clscolor 1ctitle MD5 scannerecho.echo Warning!echo.echo This feature is undergoing multiple test-runs.echo.echo This moldule will auto remove malware when scanning.echo.echo This moldule could delete system or private files without any intent to do it.echo.echo We are not responsible for any damage to your computer or your files by using this moldule.echo.echo You have been WARNED!echo.pause:dbpatchclscolor B5title MD5 scanner - Database Updates [0/4] cd /d "%~dp0\wget-1.11.4-1-bin\bin"wget --timeout=30 --timestamping --continue --no-check-certificate https://media.githubusercontent.com/media/Richienb/virusshare-hashes/master/virushashes.txtpausegoto :Asksect:Asksectclstitle MD5 scanner - Database Updates [0/4]echo Do you want to retry the update?echo.echo Y/Necho.set /p chc45=if %chc45%==y goto :dbpatchif %chc45%==Y goto :dbpatchif %chc45%==n goto :scanif %chc45%==N goto :scangoto :Asksect:scancd /d "%~dp0" clstitle MD5 scanner - Database Updates [0/4]echo Checked for Database Updates! Proceeding to Scan Engine...echo.pause clstitle MD5 scanner - Scan Path [0/4]REM Copyright 2014 BatchProgecho please specify path to scan down hereecho example C:\Usersecho AND PLEASE DONT ENTER SOMETHING THAT ISNT A COMPUTER PATHecho IF YOU ENTER SOMETHING THAT ISNT A COMPUTER PATH THE PROGRAM WILL CRASHset /p pathscan2=path:clstitle MD5 scanner - Setting up necessary things [1/4]del /f /q %~dp0\output.txtREM for /r %%x in (*) do set /a fcount=%fcount%+1REM set /a totsecscan=%fcount%*15REM set /a totminscan=%totsecscan%/60REM if %totminscan%==0 set /a etascan=%totsecscan% seconds && goto :md5hashREM set /a tothourscan=%totminscan%/60REM if %tothourscan%==0 set /a etascan=%totminscan% minutes && goto :md5hashREM set /a totdayscan=%tothourscan%/24REM if %totdayscan%==0 set /a etascan=%tothourscan% hours && goto :md5hashREM set /a etascan=%totdayscan% daysgoto :md5hash:md5hashclstitle MD5 scanner - Hashing [2/4]set "$base=%~dp0\wget-1.11.4-1-bin\bin\virushashes.txt"for /r %%f in (%pathscan2%) do %~dp0\md5.exe "%%f " >> %~dp0\output.txtcd /d "%~dp0"title MD5 scanner - Comparing Hashes with known malware hashes [3/4]cls%pathscan2% echo ETA of scan:%etascan%echo.echo Uses a lot of CPU power to process but this is real scanner.echo It does find real malware but the ability to remove it-echo is related with the environment it is run on.echo Run on Safe mode with networking for best results. for /f "tokens=1* delims= " %%a in (%~dp0\output.txt) do find "%%a" "%$base%" >nul && del /p /f /s "%%b "title MD5 scanner - Deleting Temporary Files [4/4]del /f /q %~dp0\output.txtclstitle MD5 scanner - Completedecho Scan and Delete completedecho.pausegoto :menu
I expect that
for /f "tokens=1* delims= " %%a in (%~dp0\output.txt) do find "%%a" "%$base%" >nul && del /p /f /s "%%b "
Will compare the hash in output.txt with the Malware Hash base and deletes any malicious file (prompting the user if possible) but the code did not remove any files at all.
Additional info;Sample output.txt
D3041FF4F3B76CC0353064D1133BFEDE D:\EvaxHybrid\backup\.tmp.drivedownload\1191564.driveupload 6756458290BE387639F0068C706E8881 D:\EvaxHybrid\backup\.tmp.drivedownload\1659364.driveupload 9A66042E5A3619A7B49633752044FCEA D:\EvaxHybrid\backup\.tmp.drivedownload\1977560.driveupload 9E44B511DD344F2D35FA513EEA0D54E4 D:\EvaxHybrid\backup\.tmp.drivedownload\2110290.driveupload A845071F7C4B4E67EF64BFB4BF5C3FB5 D:\EvaxHybrid\backup\.tmp.drivedownload\2923965.driveupload C49B5CD76F60FCD284209384E2E4EB55 D:\EvaxHybrid\backup\.tmp.drivedownload\2924089.driveupload 6B7484B3ADCE8141A4E7411C7F66A9D7 D:\EvaxHybrid\backup\.tmp.drivedownload\3048269.driveupload 5A48A1B8A70B5A3A39D5EBC9B370BE4D D:\EvaxHybrid\backup\.tmp.drivedownload\3395701.driveupload 58B19F4875C82A846AD6DE62096D5F19 D:\EvaxHybrid\backup\.tmp.drivedownload\3488031.driveupload C7E363D722920967E737747DB0C79EDE D:\EvaxHybrid\backup\.tmp.drivedownload\3660857.driveupload DBC938D49B09BE7E0FC1E7BEB74F487D D:\EvaxHybrid\backup\.tmp.drivedownload\3673375.driveupload 6068C7836BFF997EDBE52C6EC0AE7DF3 D:\EvaxHybrid\backup\.tmp.drivedownload\4033639.driveupload CD86C81B193594F8320832D34294CFA0 D:\EvaxHybrid\backup\.tmp.drivedownload\4132442.driveupload 91D6210AA04AA666E2F32FF64B996E7E D:\EvaxHybrid\backup\.tmp.drivedownload\4155809.driveupload 7941801B8AF887E45B5021ED2466D4F8 D:\EvaxHybrid\backup\.tmp.drivedownload\4166678.driveupload