encrypt man page on Ultrix

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crypt(3)							      crypt(3)

Name
       crypt, crypt16, setkey, encrypt - DES encryption

Syntax
       char *crypt(key, salt)
       char *key, *salt;

       char *crypt16(key, salt)
       char *key, *salt;

       void setkey(key)
       char *key;

Description
       The  subroutine is the password encryption routine.  It is based on the
       NBS Data Encryption Standard, with variations intended to frustrate use
       of hardware implementations of the DES for key search.

       The  first argument to is normally a user's typed password.  The second
       is a 2-character string chosen from the set  [a-zA-Z0-9./].   The  salt
       string  is  used	 to perturb the DES algorithm in one of 4096 different
       ways, after which the password is used as the key to encrypt repeatedly
       a  constant  string.   The returned value points to the encrypted pass‐
       word, in the same alphabet as the salt.	The first two  characters  are
       the salt itself.

       The  subroutine is identical to the function except that it will accept
       a password up to sixteen characters in length. It  generates  a	longer
       encrypted password for use with enhanced security features.

       The other entries provide primitive access to the actual DES algorithm.
       The argument of is a character array of length 64 containing  only  the
       characters  with	 numerical  value  0 and 1.  If this string is divided
       into groups of 8, the low-order bit in each group is  ignored,  leading
       to a 56-bit key which is set into the machine.

       The  argument  to  the entry is likewise a character array of length 64
       containing 0s and 1s.  The argument array is modified  in  place	 to  a
       similar	array  representing the bits of the argument after having been
       subjected to the DES algorithm using the key set by If edflag is 0, the
       argument is encrypted; if non-zero, it is decrypted.

Restrictions
       The  return values from and point to static data areas whose content is
       overwritten by each call.

Environment
   Default Environment
       In the default environment on systems that do  not  have	 the  optional
       encryption  software  installed	the function expects exactly one argu‐
       ment, the data to be encrypted. The edflag argument is not supplied and
       there  is  no way to decrypt data.  If the optional encryption software
       is installed the function behaves as it does in the POSIX  environment.
       The syntax for the default environment follows:
	    void encrypt(block)
	    char *block;

   POSIX Environment
       In  the POSIX environment the encrypt function always expects two argu‐
       ments.  The function will set errno to ENOSYS and return if  edflag  is
       non-zero and the optional encryption software is not present.  The syn‐
       tax for the POSIX environment follows:
	    void encrypt(block, edflag)
	    char *block;
	    int edflag;

       In all cases the function will set errno to ENOSYS and  return  if  the
       optional encryption software is not present.

See Also
       login(1),  passwd(1),  yppasswd(1yp),  getpass(3),  auth(5), passwd(5),
       passwd(5yp)
       ULTRIX Security Guide for Users and Programmers

								      crypt(3)
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