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xcrypt(3) — Linux manual page

XCRYPT(3)                Library Functions ManualXCRYPT(3)

NAME        top

       xencrypt, xdecrypt, passwd2des - RFS password encryption

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <rpc/des_crypt.h>void passwd2des(char*passwd, char *key);int xencrypt(char *secret, char *passwd);int xdecrypt(char *secret, char *passwd);

DESCRIPTION        top

WARNING: Do not use these functions in new code.  They do not       achieve any type of acceptable cryptographic security guarantees.       The functionpasswd2des() takes a character stringpasswd of       arbitrary length and fills a character arraykey of length 8.  The       arraykey is suitable for use as DES key.  It has odd parity set       in bit 0 of each byte.  Both other functions described here use       this function to turn their argumentpasswd into a DES key.       Thexencrypt() function takes the ASCII character stringsecret       given in hex, which must have a length that is a multiple of 16,       encrypts it using the DES key derived frompasswd bypasswd2des(),       and outputs the result again insecret as a hex string of the same       length.       Thexdecrypt() function performs the converse operation.

RETURN VALUE        top

       The functionsxencrypt() andxdecrypt() return 1 on success and 0       on error.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │passwd2des(),xencrypt(),xdecrypt() │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

VERSIONS        top

       These functions are available since glibc 2.1.

BUGS        top

       The prototypes are missing from the abovementioned include file.

SEE ALSO        top

cbc_crypt(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17XCRYPT(3)

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