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ENCRYPT(3P)                POSIX Programmer's Manual               ENCRYPT(3P)
PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
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 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 POSIX.1-2008, <unistd.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          ENCRYPT(3P)