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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.
None.
crypt(3p), encrypt(3p) The Base Definitions volume of POSIX.1‐2008, stdlib.h(0p)
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)
Pages that refer to this page: stdlib.h(0p), crypt(3p), encrypt(3p)