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.
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.
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
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/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
IEEE/The Open Group 2013 ENCRYPT(3P)