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
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 us-
ing the DES key derived from passwd by passwd2des(), and outputs the re-
sult 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 er-
ror.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│ passwd2des(), xencrypt(), xdecrypt() │ 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 6.9.1 2024-05-02 XCRYPT(3)
Generated by dwww version 1.16 on Tue Dec 16 06:29:50 CET 2025.