mirror of
https://github.com/sheumann/telnetd.git
synced 2024-11-25 20:32:19 +00:00
60fe3b5542
0 might simply be part of the ciphertext. PR: bin/40266 Submitted by: andr@dgap.mipt.ru MFC after: 3 days git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@102250 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* Dave Safford. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/* public key routines */
|
|
/* functions:
|
|
genkeys(char *public, char *secret)
|
|
common_key(char *secret, char *public, desData *deskey)
|
|
pk_encode(char *in, *out, DesData *deskey);
|
|
pk_decode(char *in, *out, DesData *deskey);
|
|
where
|
|
char public[HEXKEYBYTES + 1];
|
|
char secret[HEXKEYBYTES + 1];
|
|
*/
|
|
|
|
#include <sys/time.h>
|
|
#include <openssl/des.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "mp.h"
|
|
#include "pk.h"
|
|
|
|
static void adjust(char keyout[HEXKEYBYTES+1], char *keyin);
|
|
|
|
/*
|
|
* Choose top 128 bits of the common key to use as our idea key.
|
|
*/
|
|
static void
|
|
extractideakey(MINT *ck, IdeaData *ideakey)
|
|
{
|
|
MINT *a;
|
|
MINT *z;
|
|
short r;
|
|
int i;
|
|
short base = (1 << 8);
|
|
char *k;
|
|
|
|
z = itom(0);
|
|
a = itom(0);
|
|
madd(ck, z, a);
|
|
for (i = 0; i < ((KEYSIZE - 128) / 8); i++) {
|
|
sdiv(a, base, a, &r);
|
|
}
|
|
k = (char *)ideakey;
|
|
for (i = 0; i < 16; i++) {
|
|
sdiv(a, base, a, &r);
|
|
*k++ = r;
|
|
}
|
|
mfree(z);
|
|
mfree(a);
|
|
}
|
|
|
|
/*
|
|
* Choose middle 64 bits of the common key to use as our des key, possibly
|
|
* overwriting the lower order bits by setting parity.
|
|
*/
|
|
static void
|
|
extractdeskey(MINT *ck, DesData *deskey)
|
|
{
|
|
MINT *a;
|
|
MINT *z;
|
|
short r;
|
|
int i;
|
|
short base = (1 << 8);
|
|
char *k;
|
|
|
|
z = itom(0);
|
|
a = itom(0);
|
|
madd(ck, z, a);
|
|
for (i = 0; i < ((KEYSIZE - 64) / 2) / 8; i++) {
|
|
sdiv(a, base, a, &r);
|
|
}
|
|
k = (char *)deskey;
|
|
for (i = 0; i < 8; i++) {
|
|
sdiv(a, base, a, &r);
|
|
*k++ = r;
|
|
}
|
|
mfree(z);
|
|
mfree(a);
|
|
}
|
|
|
|
/*
|
|
* get common key from my secret key and his public key
|
|
*/
|
|
void
|
|
common_key(char *xsecret, char *xpublic, IdeaData *ideakey, DesData *deskey)
|
|
{
|
|
MINT *public;
|
|
MINT *secret;
|
|
MINT *common;
|
|
MINT *modulus = xtom(HEXMODULUS);
|
|
|
|
public = xtom(xpublic);
|
|
secret = xtom(xsecret);
|
|
common = itom(0);
|
|
pow(public, secret, modulus, common);
|
|
extractdeskey(common, deskey);
|
|
extractideakey(common, ideakey);
|
|
des_set_odd_parity(deskey);
|
|
mfree(common);
|
|
mfree(secret);
|
|
mfree(public);
|
|
mfree(modulus);
|
|
}
|
|
|
|
/*
|
|
* Generate a seed
|
|
*/
|
|
static void
|
|
getseed(char *seed, int seedsize)
|
|
{
|
|
int i;
|
|
|
|
srandomdev();
|
|
for (i = 0; i < seedsize; i++) {
|
|
seed[i] = random() & 0xff;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Generate a random public/secret key pair
|
|
*/
|
|
void
|
|
genkeys(char *public, char *secret)
|
|
{
|
|
size_t i;
|
|
|
|
# define BASEBITS (8*sizeof(short) - 1)
|
|
# define BASE (1 << BASEBITS)
|
|
|
|
MINT *pk = itom(0);
|
|
MINT *sk = itom(0);
|
|
MINT *tmp;
|
|
MINT *base = itom(BASE);
|
|
MINT *root = itom(PROOT);
|
|
MINT *modulus = xtom(HEXMODULUS);
|
|
short r;
|
|
unsigned short seed[KEYSIZE/BASEBITS + 1];
|
|
char *xkey;
|
|
|
|
getseed((char *)seed, sizeof(seed));
|
|
for (i = 0; i < KEYSIZE/BASEBITS + 1; i++) {
|
|
r = seed[i] % BASE;
|
|
tmp = itom(r);
|
|
mult(sk, base, sk);
|
|
madd(sk, tmp, sk);
|
|
mfree(tmp);
|
|
}
|
|
tmp = itom(0);
|
|
mdiv(sk, modulus, tmp, sk);
|
|
mfree(tmp);
|
|
pow(root, sk, modulus, pk);
|
|
xkey = mtox(sk);
|
|
adjust(secret, xkey);
|
|
xkey = mtox(pk);
|
|
adjust(public, xkey);
|
|
mfree(sk);
|
|
mfree(base);
|
|
mfree(pk);
|
|
mfree(root);
|
|
mfree(modulus);
|
|
}
|
|
|
|
/*
|
|
* Adjust the input key so that it is 0-filled on the left
|
|
*/
|
|
static void
|
|
adjust(char keyout[HEXKEYBYTES+1], char *keyin)
|
|
{
|
|
char *p;
|
|
char *s;
|
|
|
|
for (p = keyin; *p; p++)
|
|
;
|
|
for (s = keyout + HEXKEYBYTES; p >= keyin; p--, s--) {
|
|
*s = *p;
|
|
}
|
|
while (s >= keyout) {
|
|
*s-- = '0';
|
|
}
|
|
}
|
|
|
|
static char hextab[17] = "0123456789ABCDEF";
|
|
|
|
/* given a DES key, cbc encrypt and translate input to terminated hex */
|
|
void
|
|
pk_encode(char *in, char *out, DesData *key)
|
|
{
|
|
char buf[256];
|
|
DesData i;
|
|
des_key_schedule k;
|
|
int l,op,deslen;
|
|
|
|
memset(&i,0,sizeof(i));
|
|
memset(buf,0,sizeof(buf));
|
|
deslen = ((strlen(in) + 7)/8)*8;
|
|
des_key_sched(key, k);
|
|
des_cbc_encrypt(in,buf,deslen, k,&i,DES_ENCRYPT);
|
|
for (l=0,op=0;l<deslen;l++) {
|
|
out[op++] = hextab[(buf[l] & 0xf0) >> 4];
|
|
out[op++] = hextab[(buf[l] & 0x0f)];
|
|
}
|
|
out[op] = '\0';
|
|
}
|
|
|
|
/* given a DES key, translate input from hex and decrypt */
|
|
void
|
|
pk_decode(char *in, char *out, DesData *key)
|
|
{
|
|
char buf[256];
|
|
DesData i;
|
|
des_key_schedule k;
|
|
int n1,n2,op;
|
|
size_t l;
|
|
|
|
memset(&i,0,sizeof(i));
|
|
memset(buf,0,sizeof(buf));
|
|
for (l=0,op=0;l<strlen(in)/2;l++,op+=2) {
|
|
if (in[op] > '9')
|
|
n1 = in[op] - 'A' + 10;
|
|
else
|
|
n1 = in[op] - '0';
|
|
if (in[op+1] > '9')
|
|
n2 = in[op+1] - 'A' + 10;
|
|
else
|
|
n2 = in[op+1] - '0';
|
|
buf[l] = n1*16 +n2;
|
|
}
|
|
des_key_sched(key, k);
|
|
des_cbc_encrypt(buf,out,strlen(in)/2, k,&i,DES_DECRYPT);
|
|
out[strlen(in)/2] = '\0';
|
|
}
|