PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

       setkey — set encoding key (CRYPT)

SYNOPSIS         top

       #include <stdlib.h>

       void setkey(const char *key);

DESCRIPTION         top

       The setkey() function provides access to an implementation-defined
       encoding algorithm. The argument of setkey() is an array of length 64
       bytes containing only the bytes with numerical value of 0 and 1. If
       this string is divided into groups of 8, the low-order bit in each
       group is ignored; this gives a 56-bit key which is used by the
       algorithm. This is the key that shall be used with the algorithm to
       encode a string block passed to encrypt().

       The setkey() 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 setkey().  If errno is non-zero
       on return, an error has occurred.

       The setkey() function need not be thread-safe.

RETURN VALUE         top

       No values are returned.

ERRORS         top

       The setkey() function shall fail if:

       ENOSYS The functionality is not supported on this implementation.

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       Decoding need not be implemented in all environments. This is related
       to government restrictions in some countries 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

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       crypt(3p), encrypt(3p)

       The Base Definitions volume of POSIX.1‐2008, stdlib.h(0p)

COPYRIGHT         top

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

IEEE/The Open Group                 2013                          SETKEY(3P)