47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/*
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* salt.c - generate a random salt string for crypt()
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*
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* Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
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* public domain.
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*/
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#include <config.h>
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#ident "$Id: salt.c,v 1.10 2005/08/31 17:24:58 kloczek Exp $"
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#include <sys/time.h>
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#include <stdlib.h>
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#include "prototypes.h"
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#include "defines.h"
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#include "getdef.h"
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/*
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* Generate 8 base64 ASCII characters of random salt. If MD5_CRYPT_ENAB
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* in /etc/login.defs is "yes", the salt string will be prefixed by "$1$"
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* (magic) and pw_encrypt() will execute the MD5-based FreeBSD-compatible
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* version of crypt() instead of the standard one.
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*/
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char *crypt_make_salt (void)
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{
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struct timeval tv;
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static char result[40];
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result[0] = '\0';
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#ifndef USE_PAM
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if (getdef_bool ("MD5_CRYPT_ENAB")) {
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strcpy (result, "$1$"); /* magic for the new MD5 crypt() */
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}
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#endif
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/*
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* Generate 8 chars of salt, the old crypt() will use only first 2.
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*/
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gettimeofday (&tv, (struct timezone *) 0);
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strcat (result, l64a (tv.tv_usec));
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strcat (result, l64a (tv.tv_sec + getpid () + clock ()));
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if (strlen (result) > 3 + 8) /* magic+salt */
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result[11] = '\0';
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return result;
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}
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