xencrypt(3) RFS password encryption

Other Alias

xdecrypt, passwd2des


#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 error.


These functions are available in glibc since version 2.1.


For an explanation of the terms used in this section, see attributes(7).
passwd2des(), xencrypt(), xdecrypt() Thread safetyMT-Safe


The prototypes are missing from the abovementioned include file.


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