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

12       encrypt — encoding function (CRYPT)
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SYNOPSIS

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

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

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

42       The encrypt() function shall fail if:
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44       ENOSYS The functionality is not supported on this implementation.
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46       The following sections are informative.
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EXAMPLES

49       None.
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APPLICATION USAGE

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

63       None.
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FUTURE DIRECTIONS

66       A future version of the standard may mark this interface as obsolete or
67       remove it altogether.
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SEE ALSO

70       crypt(), setkey()
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72       The Base Definitions volume of POSIX.1‐2017, <unistd.h>
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75       Portions  of  this text are reprinted and reproduced in electronic form
76       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
77       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
78       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
79       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
80       event of any discrepancy between this version and the original IEEE and
81       The  Open Group Standard, the original IEEE and The Open Group Standard
82       is the referee document. The original Standard can be  obtained  online
83       at http://www.opengroup.org/unix/online.html .
84
85       Any  typographical  or  formatting  errors that appear in this page are
86       most likely to have been introduced during the conversion of the source
87       files  to  man page format. To report such errors, see https://www.ker‐
88       nel.org/doc/man-pages/reporting_bugs.html .
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92IEEE/The Open Group                  2017                          ENCRYPT(3P)
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