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

NAME
       setkey - set encoding key (CRYPT)

SYNOPSIS
       #include <stdlib.h>

       void setkey(const char *key);

DESCRIPTION
       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 numeri-
       cal  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 reentrant. A function that is not required to be reen-
       trant is not required to be thread-safe.

RETURN VALUE
       No values are returned.

ERRORS
       The setkey() function shall fail if:

       ENOSYS The functionality is not supported on this implementation.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       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 fea-
       ture  in  the  routines supplied. Thus the exported version of encrypt() does encoding but
       not decoding.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       crypt() , encrypt() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					SETKEY(P)
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