Movatterモバイル変換

encrypt(3p) — Linux manual page

ENCRYPT(3P)             POSIX Programmer's ManualENCRYPT(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(charblock[64], intedflag);

DESCRIPTION        top

       Theencrypt() function shall provide access to an implementation-       defined encoding algorithm. The key generated bysetkey() is used       to encrypt the stringblock withencrypt().       Theblock argument toencrypt() 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 bysetkey().  Ifedflag is 0, the argument is encoded. Ifedflag is       1, the argument may be decoded (see the APPLICATION USAGE       section); if the argument is not decoded,errno shall be set to[ENOSYS].       Theencrypt() function shall not change the setting oferrno if       successful. An application wishing to check for error situations       should seterrno to 0 before callingencrypt().  Iferrno is non-       zero on return, an error has occurred.       Theencrypt() function need not be thread-safe.

RETURN VALUE        top

       Theencrypt() function shall not return a value.

ERRORS        top

       Theencrypt() function shall fail if:ENOSYSThe functionality is not supported on this implementation.The following sections are informative.

EXAMPLES        top

       None.

APPLICATION USAGE        top

       Historical implementations of theencrypt() 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 ofencrypt() does encoding but not decoding.

RATIONALE        top

       None.

FUTURE DIRECTIONS        top

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

SEE ALSO        top

crypt(3p),setkey(3p)       The Base Definitions volume of POSIX.1‐2017,unistd.h(0p)

COPYRIGHT        top

       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 athttp://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, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017ENCRYPT(3P)

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

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.