encrypt(3p) — Linux manual page


ENCRYPT(3P)             POSIX Programmer's Manual            ENCRYPT(3P)

PROLOG         top

       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         top

       encrypt — encoding function (CRYPT)

SYNOPSIS         top

       #include <unistd.h>

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

DESCRIPTION         top

       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

       The encrypt() function shall not change the setting of errno if
       successful. 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         top

       The encrypt() function shall not return a value.

ERRORS         top

       The encrypt() function shall fail if:

       ENOSYS The functionality is not supported on this implementation.

       The following sections are informative.

EXAMPLES         top



       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         top



       A future version of the standard may mark this interface as
       obsolete or remove it altogether.

SEE ALSO         top

       crypt(3p), setkey(3p)

       The Base Definitions volume of POSIX.1‐2017, unistd.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                       ENCRYPT(3P)

Pages that refer to this page: unistd.h(0p)crypt(3p)setkey(3p)