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Old 15th September 2008
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Default SHA-256?

Just wondering how would one do a SHA-256 checksum of files on BSD systems and Mac OS X?

Do you need to install some kind of software in ports to do so?

I have been using `openssl sha1 filename`, but sometimes I wonder if SHA-256 and others can be done as well.

Thanks.
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Old 15th September 2008
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FreeBSD comes with built-in command "sha256"
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Old 16th September 2008
Darwimy Darwimy is offline
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'openssl dgst -sha256 filename' will also do the trick, but you need a recent version of OpenSSL (the one from FreeBSD 7.0 is fine).
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Old 17th September 2008
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So which version is that? Seems like OS X and OpenBSD 4.2 don't have it yet...
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Old 17th September 2008
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Code:
Terry@dixie$ uname -r                                                      2:56
7.0-STABLE
Terry@dixie$ openssl version                                               2:57
OpenSSL 0.9.8e 23 Feb 2007
Terry@dixie$ openssl dgst -sha256 ~/.vimrc                                 2:57
SHA256(/usr/home/Terry/.vimrc)= d5b17cc1975d3095c6353f3fdced45ae867c06e02c1efb7c09662cdc796724b0
Terry@dixie$                                                               2:57
On my OpenBSD 4.3 system it says: OpenSSL 0.9.7j 04 May 2006, you can check the version you have likewise ($ openssl version).
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Old 17th September 2008
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From the OpenBSD 4.2 man page sha-1(1):
Code:
     The sha1 command is shorthand for

           cksum -a sha1

     The cksum(1) command can also be used to compute digests from the SHA-2
     family: sha256, sha384 and sha512.
From man cksum(1)
Code:
     -a algorithms
             Use the specified algorithm(s) instead of the default (cksum).
             Supported algorithms include cksum, md4, md5, rmd160, sha1,
             sha256, sha384, sha512, sum, and sysvsum.
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Old 26th September 2008
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Ah never knew that there is a cksum command, thanks alot!!
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Old 26th June 2009
jbz jbz is offline
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Quote:
Originally Posted by Sunnz View Post
Just wondering how would one do a SHA-256 checksum of files on BSD systems and Mac OS X?
Thanks.
If you want a GUI utility to do this OSX, you can use hashtab at:

http://www.beeblebrox.org/hashtab

Sorry about the weird url format, the forum won't let me post url's because I don't have enough posts apparently, but it is a pretty useful little free utility for generating all kind of checksums.


[EDIT: Carpetsmoker: Made proper link -- After 10 posts you'll be able to post links, this is an anti-spam measure, I'm sorry for the inconvenience.
Welcome to the forums and thanks for your contribution]

Last edited by Carpetsmoker; 26th June 2009 at 06:53 AM. Reason: Make link
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Old 27th June 2009
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Thanks jbz!!!
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Old 10th March 2012
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I just wish someone had shared an example command line to do an actual checksum confirmation. I spent quite a few minutes working this one out. I think the man page synopsis may be wrong or inaccurate, and it doesn't mention exit status quietly used to confirm check. Also, big files take a small while to check so you can't do too many tests quickly and not sure if it's actually hung or waiting for input. I tried pipeing file into the command as well at one point.

On Mac OS X 10.6 Snow Leopard checking a FreeBSD SHA256 checksum.
I've downloaded a 2.1 GB ISO file and the checksums are provided inside a file called CHECKSUM.SHA256 (there's an MD5 list of checksums too).

$ grep dvd CHECKSUM.SHA256
SHA256 (FreeBSD-9.0-RELEASE-i386-dvd1.iso) = ebc75ecdbd0580fbe9e59373962e0fc452c4480082af563e5c d765aca1ecd705

$ /usr/bin/shasum -a 256 FreeBSD-9.0-RELEASE-i386-dvd1.iso
ebc75ecdbd0580fbe9e59373962e0fc452c4480082af563e5c d765aca1ecd705 FreeBSD-9.0-RELEASE-i386-dvd1.iso

$ /usr/bin/shasum -a 256 -c CHECKSUM.SHA256 FreeBSD-9.0-RELEASE-i386-dvd1.iso
$ echo $?
0
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Old 10th March 2012
AnilG AnilG is offline
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Actually, I still haven't got it right. The return status seems to always be 0.

Code:
-rw-------   1 anil  staff  2244231168 Mar 10 00:50:38 2012 FreeBSD-9.0-RELEASE-i386-dvd1.iso
-rw-------   1 anil  staff  2244231166 Mar 10 13:16:46 2012 test.iso

$ /usr/bin/shasum -a 256 -c CHECKSUM.SHA256 FreeBSD-9.0-RELEASE-i386-dvd1.iso 
$ echo $?
0

$ /usr/bin/shasum -a 256 -c CHECKSUM.SHA256 test.iso
$ echo $?
0
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Old 10th March 2012
J65nko J65nko is offline
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Doesn't the man page for shasum mention something similar like the OpenBSD man page cksum(1)?

Code:
EXIT STATUS
     The cksum and sum utilities exit 0 on success or >0 if an error occurred.
An error code of zero indicating success is quite standard on Unix and Unix-look-a-likes
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