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/*
* lib/des425/enc_dec.c
*
* Copyright 1985, 1986, 1987, 1988, 1990 by the Massachusetts Institute
* of Technology.
* All Rights Reserved.
*
* These routines perform encryption and decryption using the DES
* private key algorithm, or else a subset of it -- fewer inner loops.
* (AUTH_DES_ITER defaults to 16, may be less.)
*
* Under U.S. law, this software may not be exported outside the US
* without license from the U.S. Commerce department.
*
* These routines form the library interface to the DES facilities.
*
* Originally written 8/85 by Steve Miller, MIT Project Athena.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
*/
#include "des.h"
/*
* This routine performs DES cipher-block-chaining operation, either
* encrypting from cleartext to ciphertext, if encrypt != 0 or
* decrypting from ciphertext to cleartext, if encrypt == 0.
*
* The key schedule is passed as an arg, as well as the cleartext or
* ciphertext. The cleartext and ciphertext should be in host order.
*
* NOTE-- the output is ALWAYS an multiple of 8 bytes long. If not
* enough space was provided, your program will get trashed.
*
* For encryption, the cleartext string is null padded, at the end, to
* an integral multiple of eight bytes.
*
* For decryption, the ciphertext will be used in integral multiples
* of 8 bytes, but only the first "length" bytes returned into the
* cleartext.
*/
int
des_cbc_encrypt(in,out,length,key,iv,encrypt)
krb5_octet *in; /* >= length bytes of input text */
krb5_octet *out; /* >= length bytes of output text */
register long length; /* in bytes */
mit_des_key_schedule key; /* precomputed key schedule */
krb5_octet *iv; /* 8 bytes of ivec */
int encrypt; /* 0 ==> decrypt, else encrypt */
{
return (mit_des_cbc_encrypt((const des_cblock *) in,
(des_cblock *) out,
length, key, iv, encrypt));
}
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