Bug 679530 - crypt(3) incorrect key length
crypt(3) incorrect key length
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: man-pages (Show other bugs)
All Linux
medium Severity medium
: rc
: ---
Assigned To: Ivana Varekova
BaseOS QE - Apps
: ManPageChange, Patch
Depends On:
  Show dependency treegraph
Reported: 2011-02-22 14:40 EST by Jeff Bastian
Modified: 2011-05-19 10:01 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2011-05-19 10:01:26 EDT
Type: ---
Regression: ---
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Documentation: ---
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
patch to update crypt(3) man page (952 bytes, patch)
2011-02-22 14:46 EST, Jeff Bastian
no flags Details | Diff

  None (edit)
Description Jeff Bastian 2011-02-22 14:40:27 EST
Description of problem:
The crypt(3) man page states:
       In the SHA implementation the entire key is significant
       (instead of only the first 8 bytes in MD5).
This is incorrect.  Both MD5 and SHA consider the entire key; it's DES that only uses the first 8 bytes.

This was fixed upstream in man-pages-3.25; see the attached patch.

Version-Release number of selected component (if applicable):

Additional info:
From the man-pages-3.25/Changes file:
    Petr Baudis
        Correct note on key portion significance
            As Marcel Moreaux notes:

                The Linux manpage for crypt()[1] contains the following
                statement as the last sentence of the NOTES section:

                    In the SHA implementation the entire key is significant
                    (instead of only the first 8 bytes in MD5).

                It should probably say "DES" where it says "MD5" (and maybe
                "MD5/SHA" where it says "SHA"), because in MD5 password hashing,
                the entire key is significant, not just the first 8 bytes.

            This patch fixes the wording.
Comment 1 Jeff Bastian 2011-02-22 14:46:27 EST
Created attachment 480226 [details]
patch to update crypt(3) man page
Comment 5 errata-xmlrpc 2011-05-19 10:01:26 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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