| .\" Copyright 2003 walter harms (walter.harms@informatik.uni-oldenburg.de) |
| .\" |
| .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE) |
| .\" Distributed under GPL |
| .\" %%%LICENSE_END |
| .\" |
| .\" this is the 3rd type of interface for cryptographic routines |
| .\" 1. encrypt() expects a bit field |
| .\" 2. cbc_crypt() byte values |
| .\" 3. xencrypt() a hexstring |
| .\" to bad to be true :( |
| .\" |
| .TH XCRYPT 3 2021-03-22 "" "Linux Programmer's Manual" |
| .SH NAME |
| xencrypt, xdecrypt, passwd2des \- RFS password encryption |
| .SH SYNOPSIS |
| .nf |
| .B "#include <rpc/des_crypt.h>" |
| .PP |
| .BI "void passwd2des(char " *passwd ", char *" key ");" |
| .PP |
| .BI "int xencrypt(char *" secret ", char *" passwd ");" |
| .BI "int xdecrypt(char *" secret ", char *" passwd ");" |
| .fi |
| .SH DESCRIPTION |
| .BR WARNING : |
| Do not use these functions in new code. They do not achieve |
| any type of acceptable cryptographic security guarantees. |
| .PP |
| The function |
| .BR passwd2des () |
| takes a character string |
| .I passwd |
| of arbitrary length and fills a character array |
| .I key |
| of length 8. |
| The array |
| .I 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 |
| .I passwd |
| into a DES key. |
| .PP |
| The |
| .BR xencrypt () |
| function takes the ASCII character string |
| .I secret |
| given in hex, |
| .\" (over the alphabet 0123456789abcdefABCDEF), |
| which must have a length that is a multiple of 16, |
| encrypts it using the DES key derived from |
| .I passwd |
| by |
| .BR passwd2des (), |
| and outputs the result again in |
| .I secret |
| as a hex string |
| .\" (over the alphabet 0123456789abcdef) |
| of the same length. |
| .PP |
| The |
| .BR xdecrypt () |
| function performs the converse operation. |
| .SH RETURN VALUE |
| The functions |
| .BR xencrypt () |
| and |
| .BR xdecrypt () |
| return 1 on success and 0 on error. |
| .SH VERSIONS |
| These functions are available in glibc since version 2.1. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .ad l |
| .nh |
| .TS |
| allbox; |
| lbx lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR passwd2des (), |
| .BR xencrypt (), |
| .BR xdecrypt () |
| T} Thread safety MT-Safe |
| .TE |
| .hy |
| .ad |
| .sp 1 |
| .SH BUGS |
| The prototypes are missing from the abovementioned include file. |
| .SH SEE ALSO |
| .BR cbc_crypt (3) |
