1ENCRYPT(3P)                POSIX Programmer's Manual               ENCRYPT(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       encrypt — encoding function (CRYPT)
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SYNOPSIS

16       #include <unistd.h>
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18       void encrypt(char block[64], int edflag);
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DESCRIPTION

21       The encrypt() function  shall  provide  access  to  an  implementation-
22       defined  encoding  algorithm.  The key generated by setkey() is used to
23       encrypt the string block with encrypt().
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25       The block argument to encrypt() shall be an array of  length  64  bytes
26       containing only the bytes with values of 0 and 1. The array is modified
27       in place to a similar array using the key set by setkey().   If  edflag
28       is  0,  the  argument  is  encoded. If edflag is 1, the argument may be
29       decoded (see the APPLICATION USAGE section); if  the  argument  is  not
30       decoded, errno shall be set to [ENOSYS].
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32       The  encrypt()  function  shall not change the setting of errno if suc‐
33       cessful. An application wishing to check for  error  situations  should
34       set  errno  to  0  before  calling  encrypt().  If errno is non-zero on
35       return, an error has occurred.
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37       The encrypt() function need not be thread-safe.
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RETURN VALUE

40       The encrypt() function shall not return a value.
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ERRORS

43       The encrypt() function shall fail if:
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45       ENOSYS The functionality is not supported on this implementation.
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47       The following sections are informative.
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EXAMPLES

50       None.
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APPLICATION USAGE

53       Historical implementations of the  encrypt()  function  used  a  rather
54       primitive encoding algorithm.
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56       In  some  environments,  decoding  might  not  be  implemented. This is
57       related to some Government restrictions on  encryption  and  decryption
58       routines.  Historical  practice has been to ship a different version of
59       the encryption library without the decryption feature in  the  routines
60       supplied.  Thus the exported version of encrypt() does encoding but not
61       decoding.
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RATIONALE

64       None.
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FUTURE DIRECTIONS

67       None.
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SEE ALSO

70       crypt(), setkey()
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72       The Base Definitions volume of POSIX.1‐2008, <unistd.h>
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75       Portions of this text are reprinted and reproduced in  electronic  form
76       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
77       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
78       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
79       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
80       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
81       event of any discrepancy between this version and the original IEEE and
82       The  Open Group Standard, the original IEEE and The Open Group Standard
83       is the referee document. The original Standard can be  obtained  online
84       at http://www.unix.org/online.html .
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86       Any  typographical  or  formatting  errors that appear in this page are
87       most likely to have been introduced during the conversion of the source
88       files  to  man page format. To report such errors, see https://www.ker‐
89       nel.org/doc/man-pages/reporting_bugs.html .
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93IEEE/The Open Group                  2013                          ENCRYPT(3P)
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