Hi Sandip, Shridhar,
Couple of things to note:
1. The MD5 passwords in Redhat /etc/shadow are base64 encoded.
2. The format of the password is:
$type$salt$password
type: 1 -- MD5 encrypted. Presumably other encryption schemes will
use $2, $3, etc.
salt -- 8-character salt used to permute the MD5 algorithm.
password -- the base64 of the actual MD5 hash.
3. Here's the easiest way I found to make an RH-compatible MD5
password:
perl -MCPAN -e 'install Crypt::PasswdMD5' (just once)
perl -e 'use Crypt::PasswdMD5 ; print Crypt::PasswdMD5::unix_md5_crypt "plaintext"
, time() % 100000000'
(line may have wrapped). Should be trivial to modify this to do
whatever you want with it.
Regards,
-- Raju
>>>>> "Shridhar" == Shridhar Daithankar <[EMAIL PROTECTED]> writes:
Shridhar> Hi I fI am not making a mistake there is difference
Shridhar> between md5 checksm and md5 encryption. You could use
Shridhar> crypt() perhaps...
Shridhar> Not very sure...
Shridhar> Bye Shridhar
Shridhar> Sandip Bhattacharya wrote:
>> Redhat by default uses md5 encrypted shadow passwords. Now we
>> ran into a particular problem in which we have to read the
>> shadow file and authenticate users.(No we don't want to use the
>> passwd C libraries)
>>
>> I noticed a weird thing. Isn't MD5 strings supposed to be in
>> hexadecimal? The shadow file passwords are not so.
>>
>> I tried a small experiment. I put the password of a known
>> person in a text file (without newline) and run md5sum on
>> it. The hash had nothing in common with the /etc/shadow
>> equivalent. What am i doing wrong?
--
Raju Mathur [EMAIL PROTECTED] http://kandalaya.org/
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