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-'\" t
-.\" @(#)des_crypt.3	2.1 88/08/11 4.0 RPCSRC; from 1.16 88/03/02 SMI;
-.\"
-.\" Taken from libc4 sources, which say:
-.\" Copyright (C) 1993 Eric Young - can be distributed under GPL.
-.\"
-.\" However, the above header line suggests that this file in fact is
-.\" Copyright Sun Microsystems, Inc (and is provided for unrestricted use,
-.\" see other Sun RPC sources).
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH des_crypt 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-des_crypt, ecb_crypt, cbc_crypt, des_setparity, DES_FAILED \- fast
-DES encryption
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.\" Sun version
-.\" .B #include <des_crypt.h>
-.B #include <rpc/des_crypt.h>
-.P
-.BI "[[deprecated]] int ecb_crypt(char *" key ", char " data [. datalen ],
-.BI "                             unsigned int " datalen ", \
-unsigned int " mode );
-.BI "[[deprecated]] int cbc_crypt(char *" key ", char " data [. datalen ],
-.BI "                             unsigned int " datalen ", \
-unsigned int " mode ,
-.BI "                             char *" ivec );
-.P
-.BI "[[deprecated]] void des_setparity(char *" key );
-.P
-.BI "[[deprecated]] int DES_FAILED(int " status );
-.fi
-.SH DESCRIPTION
-.BR ecb_crypt ()
-and
-.BR cbc_crypt ()
-implement the
-NBS
-DES
-(Data Encryption Standard).
-These routines are faster and more general purpose than
-.BR crypt (3).
-They also are able to utilize
-DES
-hardware if it is available.
-.BR ecb_crypt ()
-encrypts in
-ECB
-(Electronic Code Book)
-mode, which encrypts blocks of data independently.
-.BR cbc_crypt ()
-encrypts in
-CBC
-(Cipher Block Chaining)
-mode, which chains together
-successive blocks.
-CBC
-mode protects against insertions, deletions, and
-substitutions of blocks.
-Also, regularities in the clear text will
-not appear in the cipher text.
-.P
-Here is how to use these routines.
-The first argument,
-.IR key ,
-is the 8-byte encryption key with parity.
-To set the key's parity, which for
-DES
-is in the low bit of each byte, use
-.BR des_setparity ().
-The second argument,
-.IR data ,
-contains the data to be encrypted or decrypted.
-The
-third argument,
-.IR datalen ,
-is the length in bytes of
-.IR data ,
-which must be a multiple of 8.
-The fourth argument,
-.IR mode ,
-is formed by ORing together some things.
-For the encryption direction OR in either
-.B DES_ENCRYPT
-or
-.BR DES_DECRYPT .
-For software versus hardware
-encryption, OR in either
-.B DES_HW
-or
-.BR DES_SW .
-If
-.B DES_HW
-is specified, and there is no hardware, then the encryption is performed
-in software and the routine returns
-.BR DESERR_NOHWDEVICE .
-For
-.BR cbc_crypt (),
-the argument
-.I ivec
-is the 8-byte initialization
-vector for the chaining.
-It is updated to the next initialization
-vector upon return.
-.SH RETURN VALUE
-.TP
-.B DESERR_NONE
-No error.
-.TP
-.B DESERR_NOHWDEVICE
-Encryption succeeded, but done in software instead of the requested hardware.
-.TP
-.B DESERR_HWERROR
-An error occurred in the hardware or driver.
-.TP
-.B DESERR_BADPARAM
-Bad argument to routine.
-.P
-Given a result status
-.IR stat ,
-the macro
-.\" .BR DES_FAILED\c
-.\" .BR ( stat )
-.BI DES_FAILED( stat )
-is false only for the first two statuses.
-.\" So far the Sun page
-.\" Some additions - aeb
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR ecb_crypt (),
-.BR cbc_crypt (),
-.BR des_setparity ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-None.
-.SH HISTORY
-4.3BSD.
-glibc 2.1.
-Removed in glibc 2.28.
-.P
-Because they employ the DES block cipher,
-which is no longer considered secure,
-these functions were removed.
-Applications should switch to a modern cryptography library, such as
-.BR libgcrypt .
-.SH SEE ALSO
-.BR des (1),
-.BR crypt (3),
-.BR xcrypt (3)