Date: Wed, 12 May 1999 13:34:22 -0700 (PDT) From: Doug White <dwhite@resnet.uoregon.edu> To: Korvus <korvus@tasam.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: how to use crypt()... Message-ID: <Pine.BSF.4.03.9905121333100.23756-100000@resnet.uoregon.edu> In-Reply-To: <008201be9a52$764ce820$948cfea9@korvus>
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On Sun, 9 May 1999, Korvus wrote: > I'm looking to make a quick C program (genpass.c) that can be used in > scripts like the following (this is only a quick example, it may not be 100% > correct): > > #!/bin/sh > # $1 is a username, $2 is a new password for that user > export hashedpass = `echo $2 | genpass` > chpass -p "$hashedpass" $1 > > My only problem in doing this is my incomplete understanding of crypt(). > >From reading the help files, it appears as if a random 4-byte salt and a > 4-byte "iteration count" are used as the second parameter. I have no clue > what the "iteration count" should be. I looked at the > /usr/src/usr.bin/passwd sources, but I still couldn't fully understand this. > If someone could write a quick C program to do this, I would be very > thankful (especially if they could also explain the process). Thanks... He're the rule: . If you're changing an existing password, provide the old encrypted password as the salt. . Otherwise, if you are creating a password for the first time, use random data. Doug White Internet: dwhite@resnet.uoregon.edu | FreeBSD: The Power to Serve http://gladstone.uoregon.edu/~dwhite | www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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