/* * salt.c - generate a random salt string for crypt() * * Written by Marek Michalkiewicz , * public domain. */ #include #include "rcsid.h" RCSID ("$Id: salt.c,v 1.7 2005/04/06 00:21:37 kloczek Exp $") #include #include #include "prototypes.h" #include "defines.h" #include "getdef.h" /* * Generate 8 base64 ASCII characters of random salt. If MD5_CRYPT_ENAB * in /etc/login.defs is "yes", the salt string will be prefixed by "$1$" * (magic) and pw_encrypt() will execute the MD5-based FreeBSD-compatible * version of crypt() instead of the standard one. */ char *crypt_make_salt (void) { struct timeval tv; static char result[40]; result[0] = '\0'; if (getdef_bool ("MD5_CRYPT_ENAB")) { strcpy (result, "$1$"); /* magic for the new MD5 crypt() */ } /* * Generate 8 chars of salt, the old crypt() will use only first 2. */ gettimeofday (&tv, (struct timezone *) 0); strcat (result, l64a (tv.tv_usec)); strcat (result, l64a (tv.tv_sec + getpid () + clock ())); if (strlen (result) > 3 + 8) /* magic+salt */ result[11] = '\0'; return result; }