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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 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(3P)