setting encrypted password for a user

Teske, Devin Devin.Teske at
Mon Dec 23 02:50:10 UTC 2013

On Dec 22, 2013, at 4:55 PM, RW wrote:

> On Sun, 22 Dec 2013 05:47:08 +0000
> Teske, Devin wrote:
>> On Dec 21, 2013, at 9:36 PM, M. V. wrote:
>>> hello,
>>> I'm using FreeBSD-8.2. I have a program which sends "MD5 
>>> of the new password" of a user to me, and I want to reset user's
>>> password with it. I realized I can use "chpass" to set encrypted
>>> password for a user, but it needs salt and I couldn't make it work
>>> without it. so I wanted to know:
>>> - can I set user's password in FreeBSD if I have only MD5 of the
>>> password? how?
>> echo 'MD5-HASH' | pw usermod username -H 0
> Presumably that's  just a way inserting the salted hash. If
> you simply have the md5 of a password it shouldn't be possible to
> create a password entry.

RW is correct, if what is sent to you does not look like "$1$blah$moreblah"
then you don't have a hash, but a digest. You cannot turn a digest into a
hash because that would require getting at the data that was digested.

The ``echo ... | pw ...'' command I gave is only going to work if you have a
hash (looks like "$1$blah$moreblah") and not a digest (looks like "blah").

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