Questions tagged [hashing]
203 questions
807
votes
31 answers
Is there a built-in checksum utility on Windows 7?
Is there a built-in checksum/hash utility on Windows 7?
user64996
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82
votes
10 answers
How to take sha256sum of file and compare to check in one line?
I keep on finding myself wanting to download and check the integrity of the download immediately in a script, but I haven't been able to find the right incantation of…
tarabyte
- 2,585
55
votes
11 answers
Is there an Excel function to create a hash value?
I'm working with a number of data lists that are keyed by document name. The document names, while very descriptive, are quite cumbersome if I need to view them on (up to 256 bytes is a lot of real estate) and I'd love to be able to create a smaller…
dwwilson66
- 1,849
54
votes
15 answers
sha1sum for a directory of directories
sha1sum ./path/to/directory/* | sha1sum
the above was posted as a way to compute a sha1sum of a directory which contains files. This command fails if the directory includes more directories. Is there a way to recursively compute the sha1sum of a…
Ocasta Eshu
- 1,018
42
votes
4 answers
Get the fingerprint of an existing SSH public key
This Question asks about getting the fingerprint of a SSH key while generating the new key with ssh-keygen.
But how does one get determine the fingerprint of an existing public key in a .pub file?
➥ How to get:
SHA256 hash of an existing…
Basil Bourque
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34
votes
8 answers
Can a file be maliciously changed in a way that maintains its original SHA-1 Hash?
According to this article, and many others, SHA-1 is not secure.
In my case, I am not concerned about passwords or digital certificates. I am concerned about file integrity.
Is it reasonably possible for a file (e.g. an ISO image or executable file)…
misha256
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29
votes
5 answers
Why is my command-line hash different from online MD5 hash results?
On a Mac OS X v10.5 (Leopard) PowerPC, if I do: echo "hello" | md5 on the command line, the result is:
b1946ac92492d2347c6235b4d2611184
But if I enter hello into one of the online MD5 hash sites like http://md5online.net/, I…
pellea72
- 333
25
votes
3 answers
How can zero byte files generate a hash value?
How can a zero byte text file generate a hash when hashed with sha1sum, sha256sum etc? What data are the programs hashing to generate a hash value?
Ta
Gizmo_the_Great
- 583
23
votes
1 answer
How do I recover the password of a RAR file on Mac OS X?
I'm running Mac OS X 10.6.2 and have been handed a couple of old files that need to be extracted. Old backups or finances or bills I believe. They are RAR files, and password protected. Is there a way to extract the hash from these files so I can…
Josh K
- 12,990
20
votes
6 answers
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 folder using cmd?
Hari
- 201
19
votes
6 answers
How to compare parts of files by hash?
I have one successfully downloaded file and another failed download (only the first 100 MB of a large file) which I suspect is the same file.
To verify this, I'd like to check their hashes, but since I only have a part of the unsuccessfully…
sinned
- 519
18
votes
5 answers
Why is MD5 still used heavily?
MD5 seems to have well documented vulnerabilities and yet it remains widespread in its usage. Does anyone have any reasons for it remaining a viable option when other alternatives (e.g. SHA-2) seem to be more robust?
David in Dakota
- 391
18
votes
8 answers
How can I generate an MD5 sum for a folder on Windows?
There are several posts about generating MD5 sums for files and/or folders on various Windows platforms. However, none of these worked for me. I tried:
Windows CertUtil: CertUtil -hashfile myFileName MD5 returns "Access is denied" on all folders…
Klangen
- 847
16
votes
7 answers
Safe way to verify that a Microsoft ISO has not been tampered with
I'd like to make sure an ISO (disc image) I have for a Microsoft Windows 10 OS is genuine. The way I usually do this with any file is by computing a hash of the file and comparing the result to the expected hash (typically provided by the software…
BeetleJuice
- 877
15
votes
1 answer
Which file system automatically stores hashes of files?
Which file system automatically computes and stores hashes of files and later checks them at access to detect corruption?
Adrian Panasiuk
- 1,165