setkey man page on Tru64

Man page or keyword search:  
man Server   12896 pages
apropos Keyword Search (all sections)
Output format
Tru64 logo
[printable version]

crypt(3)							      crypt(3)

NAME
       crypt, crypt16, setkey, encrypt - DES encryption

SYNOPSIS
       #include <unistd.h> #include <stdlib.h>

       char *crypt(
	       const char *key,
	       const char *salt ); char *crypt16(
	       const char *key,
	       const char *salt ); void setkey(
	       const char *key );

DESCRIPTION
       The  crypt() subroutine is the password encryption routine. It is based
       on the NBS Data Encryption Standard, with variations intended to	 frus‐
       trate use of hardware implementations of the DES for key search.

       The  first argument to crypt() 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 differ‐
       ent ways, after which the password  is  used  as	 the  key  to  encrypt
       repeatedly  a  constant	string.	 The  returned	value  points  to  the
       encrypted password, in the same alphabet as the	salt.  The  first  two
       characters are the salt itself.

       The  crypt16()  subroutine  is identical to the crypt() 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 setkey() 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 encrypt() 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 setkey(). If
       edflag is 0, the argument is encrypted; if non-zero, it is decrypted.

RESTRICTIONS
       The return values from crypt() and crypt16() 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 encrypt()  function  expects  exactly
       one argument, the data to be encrypted. The edflag argument is not sup‐
       plied and there is no way to decrypt data. If the  optional  encryption
       software	 is installed the encrypt() 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 encrypt() function will set errno to ENOSYS and  return  if
       edflag is non-zero and the optional encryption software is not present.
       The syntax for  the  POSIX  environment	follows:  void	encrypt(block,
       edflag) char *block; int edflag;

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

SEE ALSO
       login(1), passwd(1), yppasswd(1), getpass(3), passwd(4), prpasswd(4)

								      crypt(3)
[top]
                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
More information is available in HTML format for server Tru64

List of man pages available for Tru64

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net