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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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SETKEY(3P) POSIX Programmer's Manual SETKEY(3P)
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.
setkey — set encoding key (CRYPT)
#include <stdlib.h>
void setkey(const char *key);
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.
No values are returned.
The setkey() function shall fail if:
ENOSYS The functionality is not supported on this implementation.
The following sections are informative.
None.
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.
None.
A future version of the standard may mark this interface as
obsolete or remove it altogether.
crypt(3p), encrypt(3p)
The Base Definitions volume of POSIX.1‐2017, stdlib.h(0p)
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 SETKEY(3P)
Pages that refer to this page: stdlib.h(0p), crypt(3p), encrypt(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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