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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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ENCRYPT(3P) POSIX Programmer's Manual ENCRYPT(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.
encrypt — encoding function (CRYPT)
#include <unistd.h>
void encrypt(char block[64], int edflag);
The encrypt() function shall provide access to an implementation-
defined encoding algorithm. The key generated by setkey() is used
to encrypt the string block with encrypt().
The block argument to encrypt() shall be an array of length 64
bytes containing only the bytes with values of 0 and 1. The array
is modified in place to a similar array using the key set by
setkey(). If edflag is 0, the argument is encoded. If edflag is
1, the argument may be decoded (see the APPLICATION USAGE
section); if the argument is not decoded, errno shall be set to
[ENOSYS].
The encrypt() 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 encrypt(). If errno is non-
zero on return, an error has occurred.
The encrypt() function need not be thread-safe.
The encrypt() function shall not return a value.
The encrypt() function shall fail if:
ENOSYS The functionality is not supported on this implementation.
The following sections are informative.
None.
Historical implementations of the encrypt() function used a
rather primitive encoding algorithm.
In some environments, decoding might not be implemented. This is
related to some Government restrictions 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.
A future version of the standard may mark this interface as
obsolete or remove it altogether.
crypt(3p), setkey(3p)
The Base Definitions volume of POSIX.1‐2017, unistd.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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 2017 ENCRYPT(3P)
Pages that refer to this page: unistd.h(0p), crypt(3p), setkey(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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