xencrypt, xdecrypt, passwd2des - RFS password encryption


   #include <rpc/des_crypt.h>

   void passwd2des(char *passwd, char *key);

   int xencrypt(char *secret, char *passwd);

   int xdecrypt(char *secret, char *passwd);


   The  function passwd2des() takes a character string passwd of arbitrary
   length and fills a character array key of length 8.  The array  key  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 argument passwd into a DES key.

   The  xencrypt()  function takes the ASCII character string secret given
   in hex, which must have a length that is a multiple of 16, encrypts  it
   using  the DES key derived from passwd by passwd2des(), and outputs the
   result again in secret as a hex string of the same length.

   The xdecrypt() function performs the converse operation.


   The functions xencrypt() and xdecrypt() return 1 on success  and  0  on


   These functions are available in glibc since version 2.1.


   For   an   explanation   of   the  terms  used  in  this  section,  see

   Interface                              Attribute      Value   
   passwd2des(), xencrypt(), xdecrypt()   Thread safety  MT-Safe 


   The prototypes are missing from the abovementioned include file.




   This page is part of release 4.09 of the Linux  man-pages  project.   A
   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at

                              2015-07-23                         XCRYPT(3)


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.