XCRYPT(3) Linux Programmer's Manual XCRYPT(3)NAME
xencrypt, xdecrypt, passwd2des - RFS password encryption
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 routines are present in libc 4.6.27 and later, and in glibc 2.1
The prototypes are missing from the abovementioned include file.
This page is part of release 3.65 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.