Questions tagged [checksum]

A checksum is a value created from a binary file that can be used to validate its authenticity and integrity. An example of a checksum is MD4, MD5 and SHA-1.

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PowerShell script to compute partial MD4 checksums

I need a script that will read an input file and calculate MD4 checksums for each 9728000 bytes chunk, until the end of the file. I've done this previously by first extracting all 9728000 bytes chunks ...
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My windows laptop is giving error code 0xc0000221 after I dropped it

It was a pretty gnarly fall, to be honest. When I start up my laptop I get a error screen that says: The header checksum for this file doesn't match the computed checksum. File: \WINDOWS\system32\...
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Is a file Overlay a security threat?

How do you tell if the "Overlay" found on some files when searching the hash checksum on VirusTotal poses any threat? Would the Overlay be part of the signed file? Does the VT page ...
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mounted a btrfs volume with nodatasum for performance… How to write the checksums for the files created that way?

Using a performance critical database being several Tb large, I mounted a btrfs volume using the nodatasum mount option. As a result, more than 50% of the space is used by newly created files without ...
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Do lower and capital letters matter for sha checksum?

I have just download a windows iso from microsoft and the checksum does match, unless lower and capital letters must be equal. Note: i copy pasted the checksum nothing was edited. ...
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On Linux, how can I make double-clicking an .md5 file verify all the audio file checksums in the directory?

On Windows, collectors of live music (wav/mp3/flac) enjoy simple programs with a simple interface that only require a simple double click of an .md5 file in a concert files folder / directory to check ...
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How can I hash/checksum any sequential download, without having to store the whole file locally?

How can I hash/checksum any sequential download, without having to store the whole file locally? It needs to work with any kind of sequential download, so "basic HTTP download" specific ...
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Is there a way to hash a directory that allows you to cancel and later resume?

Is there a way to hash a directory (e.g. like hashdeep and rhash do) that allows you to cancel and later resume where you left off?
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Compute checksums for a random selection of files whose names are listed in a file

Let's say I have a file named list_of_files.txt where each line corresponds to a file on the disk. For example: dir1/fileA.ext1 dir1/subdir1/fileB.ext2 fileC.ext3 dir2/fileD.ext4 fileE.ext5 I want to ...
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Does a repeated download protect against file corruption?

Disclosed real issue: I use a program called youtube-dl to download and archive videos from websites like YouTube and Twitch. To verify the integrity of the downloads, I download the same video twice ...
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Is downloading a media file twice and comparing their hash values enough to verify their integrity?

I often use youtube-dl to download videos. As far as I know, there is no data integrity verfication built in to youtube-dl, so what I do to verify that a video isn't corrupted in some way after ...
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Does Checksum Offloading affect latency in a good way? Does it vary depending on cpu power?

I'm trying to get an understanding of the settings that you see when you go to the advanced options of a typical intel or realtek networking card in your windows device manager. A lot of those are ...
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Need Checksum of a file on Onedrive/Sharepoint cloud

I need to check integrity of a file that I have uploaded using Microsoft Graph onto Onedrive/Sharepoint. Is there some checksum available via Microsoft Graph ? Regards Allan
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Trouble verifying md5 checksums created on Windows with Linux

Verifiying checksums inside a file usually works like this using Linux and md5sum. md5sum -c file.md5 However, using it like this on a Windows file reveals errors, that took me a long while to ...
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How to total 2 cells = Take the value in Cell A and if Cell A is blank then take the value from Cell B

Cell A Row 1 = 100 Cell B row 1= 100000 Cell C Total should be = 100 Cell A Row 2 = 0 Cell B Row 2 = 45000 Cell C Row 2 = 45000 Total of Cell C1 + C2 = 45100
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Are these strings the correct output to verify keys for file checksum?

I'm trying to verify the integrity of the files before installing a downloaded copy of Netbeans from the Apache.org site, per their suggestion. I'm not having luck verifying I am using the tools ...
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Different checksum for Pop OS 20.04 iso

I'm trying to install Pop OS (no NVIDIA). I have downloaded several times and always the checksum SHA256 is different that the checksum they show in their website. The SHA256 in Pop OS website for iso ...
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Impact of Enabling UDP Checksum (IPv4) on the System

AFAIK, UDP checksum is an optional feature on IPv4. I want to enable it on a gateway (IPv4), but I want to know if it has any negative impact on the system, e.g., increasing CPU utilization or ...
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What kind of encoding is this (sha256 variant)?

I have some config files from the program ELOG where I want to change the password manually, using something like echo -n "newpassword" | sha256sum but the value is not the expected hexa. ...
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How to checksum a SquashFS filesystem on partitionless HDD

# lsblk -f /dev/sda NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINT sda squashfs 4.0 # mount -v /dev/sda /mnt mount: /dev/sda mounted on /mnt. $ df -B1 Filesystem 1B-blocks Used ...
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Are 7z-included checksums enough to verify backup integrity?

I recently started using uncompressed, encrypted 7z archives for backups. I chose 7z because it has easy to use desktop apps for Windows and Linux, in case I need to recover the data quickly. I store ...
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Different File after uploading via FTP

As the title say, when I upload a file (in my case an encrypted jar) via FTP on my server (running Ubuntu 20.04) and try to download it, some bytes of the jar seems to be changed (so also the relative ...
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Enable checksum on FileZilla server

How can I enable checksum on the FileZilla server? I want to compare files after downloading on my Android device via FluentFTP library. The following checksum FTP commands are supported by this ...
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Enable MD5 or SHA1 hash functions in IIS

I have an IIS FTP server on my Windows 10. I am using a third party library FluentFTP to download a file. This library has a function to compare two files. And I am trying to compare my downloaded ...
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How to checksum files from filename on Linux

I have many files tagged with a CRC checksum on their filename on a Windows machine. Example: filename_[000000].extension I know there are a lot of options for Linux based systems to check/calculate ...
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How to verify a package after downloading from repositories

I have downloaded filezilla package using the command: # apt download filezilla So I have: # ls filezilla_3.50.0-3_amd64.deb UPDATE So I check sums: # md5sum filezilla_3.50.0-3_amd64.deb ...
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Validating NPM Package Integrity

I'm being tasked to validate the integrity of my downloads from npm by our IT/Security department. I'm a programmer and while I understand at a top level what performing a sha checksum is, I'm having ...
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2 votes
2 answers
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Looking for latest Blake2 b2sum.exe for Windows

I downloaded the b2sum file from blake2.net but it's from 2013 and doesn't seem to support the "compare" -c option. Several online references show several options which I cannot access with the ...
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Windows validate checksum

I am trying to validate the checksum for a Windows Citrix executable. The checksum that is provided is 64 char long. I have found instructions to validate a checksum by running this in PowerShell: ...
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Upload checksums even with secure downloads?

I noticed that people tend to upload checksums even when the download is configured to use secure connection. For example, GitHub redirects all traffic to HTTPS, but the SHA sums are nevertheless ...
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File compressor with recovery [closed]

I want to compress a lot of files with a file compressor. I've found that 7z is really good at this stuff, but the problem is that it doesn't add CRC recovery to the file to prevent corrumption in the ...
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3 answers
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Check if file exists

I have a folder with thousands (70G folder/to/check/) images that I, for each file want check if its already existing in another directory with thousands of thousands images (414G folder/to/search/). ...
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6 votes
4 answers
21k views

Any Built-In Checksum utility for Windows 10 using CRC-32?

Is there any Built-In Checksum utility for Windows 10 using CRC-32? I checked different answers which are old and mention certUtil, but that does not support CRC-32 or CRC-64. Update: I had also ...
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2 votes
1 answer
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Checksum Fail – Fedora 29 or spin KDE Plasma

I tried checksum Fedora Workstation 29 and Fedora KDE Plasma but it's always fail. Am I doing something wrong, is the tutorial incomplete or the file in the server is corrupted? Details: I use ...
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How can I get different SHA checksums for 'identical' iso files?

I have two ISO files, I call it Windows 10 ISO #1.iso Windows 10 ISO #2.iso The checksums calculated with different tools show two different values for this two *.iso files. The two textfiles show ...
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Is two different type of format of files having same data can have same checksum value?

I am not talking from the Point of View where exploitation happens. Assuming MD5 does not has any problem. If I have 2 same format of files having same content then both checksum will be same. But, ...
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How can I compare a full directory's checksum between platforms?

I have a directory full of files and subdirectories on a Win7 machine. I want to archive them, so I compress and move them to archival storage. Before compression, I use the CRC context menu to ...
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1 vote
1 answer
535 views

Get checksum over http or ftp

I am looking to provide a upload feature for my application that accepts a uri like http or ftp, which would be downloaded by the server and stored. I know that the files uploaded would be large (>1GB)...
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Different download tools result in different MP3 checksums [closed]

I wrote some code for downloading podcasts and noticed that the checksums of files I downloaded with it didn't match those of files downloaded using other methods. Initially I thought there was a bug ...
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1 answer
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how and why do "cpgz" files appear out of regular zip files?

for some reason under Mac OSX HIGH SIERRA I have noticed that once functioning .zip files are turning up with "cpgz" at the end of the file.(funny_movie.zip.cpgz) I have a feeling it has something to ...
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Is it possible to execute a command that only adds the sha256 of a file if it has been modified?

Is it possible to execute a command that adds the sha256 of a file in the previously created list and only if it has been modified according to the last date registered in that list? I do not know if ...
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check whether (recursive) directory copy is identical

I sometimes have to copy/sync large amounts of data in a directory structure from one computer to another. Typical programs I use for this purpose are rsync, syncthing, or seafile. To not exclusively ...
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Compare contents of two folders by Hash to find duplicates

I have two folders containing various files. These files don't have the same filename or the same creation Date. They may be identical though as far as the actual file is concerned. I executed a ...
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What are the most reliable attributes for comparing two files in order to confirm/verify they are 100% identical?

I had the following situation: I copied 5.5 TB worth of data (in total over 100,000 directories and 10 million files) from an old disk to a newly-purchased external disk. I used Ultracopier on ...
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4 votes
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Why is this SSD returning inconsistent data, why doesn't the backup image file match the checksum?

This is about the SSD in a notebook. It appears the SSD is already going bad, possibly even corrupting data. It appears to return different data everytime it's accessed while not in use (see below for ...
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How to be sure that readonly snapshot is not corrupted in BTRFS?

How can we sure that a readonly snapshot is not corrupted due to a disk failure? Is the only way calculating the checksums one on another and store it for further examination, or does BTRFS handle ...
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CheckSum error, cannot boot

I was watching a video on my Acer Aspire laptop when I accidentally hit it on the left side of screen with my leg, the hit was very minor. But just after the hit the video stuck and started giving a ...
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61 votes
17 answers
31k views

Does an identical cryptographic hash or checksum for two files mean they are identical?

I have 2 excel documents and I want to check if they are exactly the same, apart from the file name. For example, the files are called fileone.xls and filetwo.xls. Apart from the file names, their ...
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Given an MD5 checksum and a random file. Is it feasible to add a suffix to match the checksum?

I often hear that MD5 is insecure. But I am not sure how it can be manipulated. I don't want to be the guy who just repeat "MD5 is insecure" without knowing some details. Say, I have an 128-bits MD5 ...
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Derive sha1 hash from openssl binary base64 value

Digital Cinema Packages contain checksums in the following format as described here: $ openssl sha1 -binary 'dcpfile.xml' |openssl base64 IxcfhXNHlw+1bbDFu0kp8KRylpU= How can I take a value such as ...
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