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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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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37 views

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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3answers
106 views

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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Is there a solution to fix SVN checksum mismatch permanently?

I have almost searched all the solutions on the internet of the SVN checksum mismatch problem. The most useful solution for now is as follows: svn-checksum-mismatch-while-updating But all the ...
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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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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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180 views

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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233 views

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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52 views

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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324 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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78 views

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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2k views

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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1answer
43 views

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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138 views

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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781 views

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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495 views

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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1answer
180 views

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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142 views

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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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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214 views

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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2k views

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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How to get Btrfs verify checksum for one file?

Btrfs offers these commands to verify data integrity/checksums: btrfs scrub start <path>|<device> btrfs check --check-data-csum However, AFAIK those always verify whole filesystems; the ...
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1answer
547 views

What does star in .sha file mean?

The output contains one line per file of the form "{hash} SPACE ASTERISK [{directory} SLASH] {filename}". So what does * mean?
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How to generate MD5 hash value for multiple files in a folder using cmd

As mentioned in this page, the command:CertUtil -hashfile yourFileName MD5can be used to obtain the MD5 hash value for a particular file. How can I find the MD5 hash values for multiple files in a ...
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195 views

Windows 10 corrupts FAT partition checksum

I have a FAT16 partition (primary) that takes a total of 10.00MB of a standard USB drive. The rest of the space on the USB drive is unallocated so this is the only parttion I have there. When I plug ...
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205 views

File checksum value changed after a long time on unused drive

I have a drive with stored data that I haven't used for 3 years or more. I had then checksummed a lot of files with corz checksum. Now I'm backing up that old data into another drive, and to be safe ...
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528 views

mdadm wont mount due to checksum error

I have ubuntu raid5 on 4 disks of 1tb disks which had no dirty shutdown or power issue. The bootdisk is 5th disk which is not on mdadm. I also have XP on my bootdisk which I just started today. XP ...
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154 views

How does rclone perform remote checksum, and what is its effect on bandwidth?

I'm trying to store photos on amazon cloud drive using rclone, and whenever I upload a batch of photos, both my upload and download spikes as reported by my ISP. So if I upload 75 GB, my monthly ...
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453 views

What does shasum's --portable option do?

The shasum utility has a a -p/--portable option with the following description: -p, --portable read files in portable mode produces same digest on Windows/Unix/Mac I've never ...
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Why do I get different results from Mac's shasum than from other shasum calculators?

I'm entering: appletree:~ somename$ shasum -a 512 <<< test And the output is: ...
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758 views

netflix stall via linux iptables nat, tcp checksum errors (with workaround)

I've been trying to track down this problem for several days. I still haven't worked out what is going on, or how to fix it properly, but I do have a workaround. Problem summary Netflix stalls when ...
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992 views

Checksum for file rebuild

Is there a file checksum designed specifically for recovering a single file (archive) with data corruption? Something simple like a hash that can be used to recover the file I am trying to archive ...
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3k views

Windows Checksum Utility [closed]

I would like to install WinMD5Free.exe to run checksums - anyone know if it is legitimate? Many other sites offer it (CNet etc. so it seems ok). I have to check numerous downloads and want to verify ...
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4k views

How to checksum and verify all files on a filesystem

I would like to run sha1sum or md5sum on all my files recursively, store the results to a file (or a couple of files) and then be able to scan through the files again to verify the integrity of the ...
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288 views

Sha1Sum on kali.org

I am unable to download kali linux from their official website kali.org. I try to verify the sha1sum but all I get is invalid https://gyazo.com/2e02792c685fbd2ebfd50e04fe218501. Any ideas? I can ...
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How to verify checksum in a .mds file format?

I got the hadoop checksum file from https://dist.apache.org/repos/dist/release/hadoop/common/hadoop-2.7.1/hadoop-2.7.1.tar.gz.mds. But the file format is not the ones expected by tools like sha256sum. ...
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2k views

Can I calculate the checksum of a file as I create it?

I am creating a large tar archive and I would like to create the checksum of the archive too. I could achieve it like this: $ tar cfz archive.tar.gz files $ sha256sum archive.tar.gz > archive.tar....
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834 views

Which checksum-generating command line programs are native to macOS?

[Migrated question from stackoverflow here, because they said it was off-topic.] I'm looking for a list/an overview of the command-line programs native to macOS that let you calculate checksums. I ...
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Thinkpad T410 not booting: Simple solution?

I have a Lenovo Thinkpad T410 which I left outdoors overnight after a BBQ... No rain but likely some humidity. Symptoms? - Initially, screen remains black, nothing happens upon pressing power button....
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Sha256 checksum on terminal displaying strange characters

I've installed the hashalot first to use the sha256. Then something strange happened when using the command + filename: mlockall: Cannot allocate memory Warning: couldn't lock memory, are you root? ...
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15k views

how to verify whether a compressed .gz is corrupted or not?

I have many gz downloaded from the internet, and I would like to make sure they are not corrupted. Does the fact that I can open the archive with winzip on windows proves that everything is fine? I ...
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How to batch delete files based on their checksum matching an existing list of checksums

I'm looking for a means of deleting files based on their checksum matching a list of previously seen checksums in a text file or some other list. The context is a large photo organization project ...
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4answers
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What is the exact meaning of the QuickSFV comments at the end of an SFV file?

What are the QuickSFV comments at the end of an SFV file based on? 25-Monty_Python-The_End-EOS.mp3 D387716E ;Q1-1c11727069c13b6 ;Q1-///4AA== In version 2 it had a line more: cowiso-xvid-yrrol....
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Find/check redundant files for cleanup and backup purposes

Very often I want to find out if the contents of given folders match or if the content of a single folder is redundant - maybe to check if it's duplicate and can be removed or to make sure there are ...
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2k views

calculate checksum of every file that is being written to HDD

Is it possible to automatically calculate checksum of every file that is being written to HDD? My OS is Linux. I've read that btrfs stores some kind of checksums for files. Would be possible to dump ...
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31 views

prevent file copying not via permissions

Is there any way I can prevent a file from being copied? I don't mean via the file system, but I mean by somthing that must change if the file was copied, like some sum or timestamp My goal is to ...
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913 views

Computing a checksum of a huge file (30 GB)

I have a huge data set consisting of several files, with size of some of the files exceeding 30 GB. After compressing, transferring the data set over the network, and decompressing again I am ...