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ENCRYPT(P)		   POSIX Programmer's Manual		    ENCRYPT(P)

NAME
       encrypt - encoding function (CRYPT)

SYNOPSIS
       #include <unistd.h>

       void encrypt(char block[64], int edflag);

DESCRIPTION
       The  encrypt()  function	 shall	provide	 access	 to an implementation-
       defined encoding algorithm. The key generated by setkey()  is  used  to
       encrypt the string block with encrypt().

       The  block  argument  to encrypt() shall be an array of length 64 bytes
       containing only the bytes with values of 0 and 1. The array is modified
       in place to a similar array using the key set by setkey(). If edflag is
       0, the argument is encoded.  If	edflag	is  1,	the  argument  may  be
       decoded	(see  the  APPLICATION	USAGE section); if the argument is not
       decoded, errno shall be set to [ENOSYS].

       The encrypt() function shall not change the setting of  errno  if  suc‐
       cessful.	 An  application  wishing to check for error situations should
       set errno to 0 before calling  encrypt().   If  errno  is  non-zero  on
       return, an error has occurred.

       The  encrypt()  function	 need not be reentrant. A function that is not
       required to be reentrant is not required to be thread-safe.

RETURN VALUE
       The encrypt() function shall not return a value.

ERRORS
       The encrypt() function shall fail if:

       ENOSYS The functionality is not supported on this implementation.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       Historical implementations of the  encrypt()  function  used  a	rather
       primitive encoding algorithm.

       In  some	 environments,	decoding  might	 not  be  implemented. This is
       related to some Government restrictions on  encryption  and  decryption
       routines.  Historical  practice has been to ship a different version of
       the encryption library without the decryption feature in	 the  routines
       supplied.  Thus the exported version of encrypt() does encoding but not
       decoding.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       crypt()	 ,   setkey()	,   the	   Base	   Definitions	  volume    of
       IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			    ENCRYPT(P)
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