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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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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1answer
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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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50 views

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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2answers
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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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1answer
59 views

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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How to check if files on two differents computers are identical using checksum in a shell script?

I want to do a shell script doing this checksum verification. But it is the first time I write one. I use double authentification key to connect automatically the two computers Input : directory and ...
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1answer
198 views

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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1answer
87 views

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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OS image unaltered? SHA512 Checksum [duplicate]

looking for some professional guidance here. I am unable to get an IOS image from the original source but the file I did get matches the SHA512 and MD5 checksums from the verified source. Is it safe ...
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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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127 views

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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916 views

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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3answers
134 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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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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1answer
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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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1answer
331 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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1answer
585 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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1answer
106 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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420 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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1answer
82 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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1answer
3k 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
46 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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2answers
207 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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1answer
1k 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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1answer
537 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
235 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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149 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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2answers
330 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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1answer
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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2k views

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
777 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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230 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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1answer
330 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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1answer
712 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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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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1answer
593 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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2answers
5k views

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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0answers
875 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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1answer
1k 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 ...