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

PROLOG         top

       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.

NAME         top

       encrypt — encoding function (CRYPT)

SYNOPSIS         top

       #include <unistd.h>

       void encrypt(char block[64], int edflag);

DESCRIPTION         top

       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.

RETURN VALUE         top

       The encrypt() function shall not return a value.

ERRORS         top

       The encrypt() function shall fail if:

       ENOSYS The functionality is not supported on this implementation.

       The following sections are informative.

EXAMPLES         top



       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.

RATIONALE         top




SEE ALSO         top

       crypt(3p), setkey(3p)

       The Base Definitions volume of POSIX.1‐2008, unistd.h(0p)

COPYRIGHT         top

       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 .

       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)

Pages that refer to this page: unistd.h(0p)crypt(3p)setkey(3p)