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passlen(3)							    passlen(3)

NAME
       passlen - Determines minimum password length (Enhanced Security)

SYNOPSIS
       #include <sys/types.h> #include <sys/security.h> #include <prot.h>

       int passlen
	       time_t life_dur,
	       time_t login_delay,
	       int alphabet_size );

LIBRARY
       Enhanced Security Library (libsecurity)

PARAMETERS
       Specifies  the  password lifetime duration for an account (in seconds).
       Specifies the amount of	time  (in  seconds)  between  login  attempts.
       Specifies the number of distinct characters that can be used in a pass‐
       word.

DESCRIPTION
       The passlen() function takes the password  lifetime  duration  life_dur
       for  an account and the login_delay between login attempts, both values
       in seconds, and the alphabet_size of distinct characters,  and  returns
       the minimum password length according to the algorithm in the DoD Pass‐
       word Management Guideline (the Green Book). The parameter  that	speci‐
       fies  the probability of guessing a password is fixed to the value of 1
       chance in a million.

NOTES
       If the life_dur or prob_guess parameters change in the protected	 pass‐
       word database for this account (or for the system default if those val‐
       ues are used in an account), it is a good idea to invalidate the	 pass‐
       word  in	 case  the  new	 parameters  require a longer minimum password
       length.

       Programs using this function must be compiled with -lsecurity.

SEE ALSO
       Commands: passwd(1)

       Functions: randomword(3), exp(3), floor(3)

								    passlen(3)

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