XCRYPT(3)		    Library Functions Manual		       XCRYPT(3)

NAME
     xencrypt, xdecrypt, passwd2des - RFS password encryption

LIBRARY
     Standard C library (libc, -lc)

SYNOPSIS
     #include <rpc/des_crypt.h>

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

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

DESCRIPTION
     WARNING:  Do  not use these functions in new code.	 They do not achieve any
     type of acceptable cryptographic security guarantees.

     The function passwd2des() takes a	character  string  passwd  of  arbitrary
     length and fills a character array key of length 8.  The array key is suit-
     able  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  argu-
     ment 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.

RETURN VALUE
     The functions xencrypt() and xdecrypt() return 1 on success and 0 on error.

ATTRIBUTES
     For an explanation of the terms used in this  section,  see  attributes(7).
     allbox; lbx lb lb l l l.  Interface Attribute Value T{ passwd2des(),
     xencrypt(), xdecrypt() T}	 Thread safety	MT-Safe

VERSIONS
     These functions are available since glibc 2.1.

BUGS
     The prototypes are missing from the abovementioned include file.

SEE ALSO
     cbc_crypt(3)

Linux man-pages 6.18		   2026-02-08			       XCRYPT(3)