Unix and Linux Stack Exchange
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Questions tagged [hashsum]

Questions related to hashes, hash values or hash codes that are returned by hash functions such as SHA-1.

A hash is any well-defined procedure or mathematical function that converts a large, possibly variable-sized amount of data into a small datum, usually a single integer representing the sum of the correct digits in a piece of stored or transmitted digital data, against which later comparisons can be made to detect errors in the data. The values returned by a hash function are called hash values, hash sums, checksums or simply hashes.

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How do I get the MD5 sum of a directory's contents as one sum?

The md5sum program does not provide checksums for directories. I want to get a single MD5 checksum for the entire contents of a directory, including files in sub-directories. That is, one combined checksum made out of all the files. Is there a way…
user17429
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How to create SHA512 password hashes on command line

In Linux I can create a SHA1 password hash using sha1pass mypassword. Is there a similar command line tool which lets me create sha512 hashes? Same question for Bcrypt and PBKDF2.
student
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No sha256sum in MacOS

I tried to use sha256sum in High Sierra; I attempted to install it with MacPorts, as: sudo port install sha256sum It did not work. What to do?
Rui F Ribeiro
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Compute bcrypt hash from command line

I would like to compute the bcrypt hash of my password. Is there an open source command line tool that would do that ? I would use this hash in the Syncthing configuration file (even if I know from here that I can reset the password by editing the…
Gabriel Devillers
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How can I get a base64 encoded shaX on the cli?

sha1sum outputs a hex encoded format of the actual sha. I would like to see a base64 encoded variant. possibly some command that outputs the binary version that I can pipe, like so: echo -n "message" | | base64 or if it outputs it…
xenoterracide
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Find a file when you know its checksum?

I have the md5sum of a file and I don't know where it is on my system. Is there any easy option of find to identify a file based on its md5? Or do I need to develop a small script ? I'm working on AIX 6 without the GNU tools.
Kiwy
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/etc/shadow : how to generate $6$ 's encrypted password?

In /etc/shadow file there are encrypted password. Encrypted password is no longer crypt(3) or md5 "type 1" format. (according to this previous answer) Now I have a $6$somesalt$someveryverylongencryptedpasswd as entry. I can no longer use openssl…
Archemar
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How can I generate SHA3 if there is no sha3sum command in coreutils?

I have sha1sum or sha512sum on an average Linux distro. But where is the sha3sum command that can generateSHA-3 commands?
pepite
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Why does the gzip version of files produce a different md5 checksum

I have four files that I created using an svndump test.svn test2.svn test.svn.gz test2.svn.gz now when I run this md5sum test2.svn test.svn test.svn.gz test2.svn.gz Here is the output 89fc1d097345b0255825286d9b4d64c3 …
whoami
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Simultaneously calculate multiple digests (md5, sha256)?

Under the assumption that disk I/O and free RAM is a bottleneck (while CPU time is not the limitation), does a tool exist that can calculate multiple message digests at once? I am particularly interested in calculating the MD-5 and SHA-256 digests…
Lekensteyn
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generate consistent machine unique ID

Can we generate a unique id for each PC, something like uuuidgen, but it will never change unless there are hardware changes? I was thinking about merging CPUID and MACADDR and hash them to generate a consistent ID, but I have no idea how to parse…
uray
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md5sum prepends '\' to the checksum

Why md5sum is prepending "\" in front of the checksum when finding the checksum of a file with "\" in the name? $ md5sum /tmp/test\\test \d41d8cd98f00b204e9800998ecf8427e /tmp/test\\test The same is noted for every other utility.
jsaji
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How to find the hashing algorithm used to hash passwords?

I have the working password and can see the hash (/etc/passwd). How do I find the hashing algorithm used to hash the password, without manually trying different algorithms until I find a match?
Dorin Botan
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Does the hash of a file change if the filename changes?

Does the hash of a file change if the filename or path or timestamp or permissions change? $ echo some contents > testfile $ shasum testfile 3a2be7b07a1a19072bf54c95a8c4a3fe0cdb35d4 testfile
tarabyte
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What methods are used to encrypt passwords in /etc/passwd and /etc/shadow?

A careful examination of the /etc/passwd and /etc/shadow files reveal that the passwords stored are hashed using some form of hashing function. A quick Google search reveals that by default, the passwords are encrypted using DES. If an entry begins…
Nathan Osman
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