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setkey(3p) [centos man page]

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

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

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 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 reentrant. A function that is not required to be reentrant 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 feature 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 Technol-
       ogy -- 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 original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								SETKEY(3P)

Check Out this Related Man Page

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

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       geteuid - get the effective user ID

SYNOPSIS

       #include <unistd.h>

       uid_t geteuid(void);

DESCRIPTION

       The geteuid() function shall return the effective user ID of the calling process.

RETURN VALUE

       The geteuid() function shall always be successful and no return value is reserved to indicate an error.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       getegid(), getgid(),  getuid(),  setegid(),  seteuid(),  setgid(),  setregid(),  setreuid(),  setuid(),  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group                                                    2003                                                            GETEUID(3P)
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