b3aaa0cc21
The function pow() in libmp(3) clashes with pow(3) in libm. We could rename this single function, but we can just take the same approach as the Solaris folks did, which is to prefix all function names with mp_. libmp(3) isn't really popular nowadays. I suspect not a single application in ports depends on it. There's still a chance, so I've increased the SHLIB_MAJOR and __FreeBSD_version. Reviewed by: deischen, rdivacky
266 lines
6.7 KiB
C
266 lines
6.7 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* Dave Safford. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* public key routines */
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/* functions:
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genkeys(char *public, char *secret)
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common_key(char *secret, char *public, desData *deskey)
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pk_encode(char *in, *out, DesData *deskey);
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pk_decode(char *in, *out, DesData *deskey);
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where
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char public[HEXKEYBYTES + 1];
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char secret[HEXKEYBYTES + 1];
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*/
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#include <sys/time.h>
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#include <openssl/des.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mp.h"
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#include "pk.h"
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static void adjust(char keyout[HEXKEYBYTES+1], char *keyin);
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/*
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* Choose top 128 bits of the common key to use as our idea key.
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*/
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static void
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extractideakey(MINT *ck, IdeaData *ideakey)
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{
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MINT *a;
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MINT *z;
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short r;
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int i;
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short base = (1 << 8);
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char *k;
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z = mp_itom(0);
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a = mp_itom(0);
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mp_madd(ck, z, a);
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for (i = 0; i < ((KEYSIZE - 128) / 8); i++) {
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mp_sdiv(a, base, a, &r);
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}
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k = (char *)ideakey;
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for (i = 0; i < 16; i++) {
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mp_sdiv(a, base, a, &r);
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*k++ = r;
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}
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mp_mfree(z);
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mp_mfree(a);
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}
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/*
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* Choose middle 64 bits of the common key to use as our des key, possibly
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* overwriting the lower order bits by setting parity.
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*/
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static void
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extractdeskey(MINT *ck, DesData *deskey)
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{
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MINT *a;
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MINT *z;
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short r;
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int i;
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short base = (1 << 8);
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char *k;
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z = mp_itom(0);
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a = mp_itom(0);
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mp_madd(ck, z, a);
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for (i = 0; i < ((KEYSIZE - 64) / 2) / 8; i++) {
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mp_sdiv(a, base, a, &r);
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}
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k = (char *)deskey;
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for (i = 0; i < 8; i++) {
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mp_sdiv(a, base, a, &r);
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*k++ = r;
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}
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mp_mfree(z);
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mp_mfree(a);
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}
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/*
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* get common key from my secret key and his public key
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*/
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void
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common_key(char *xsecret, char *xpublic, IdeaData *ideakey, DesData *deskey)
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{
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MINT *public;
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MINT *secret;
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MINT *common;
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MINT *modulus = mp_xtom(HEXMODULUS);
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public = mp_xtom(xpublic);
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secret = mp_xtom(xsecret);
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common = mp_itom(0);
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mp_pow(public, secret, modulus, common);
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extractdeskey(common, deskey);
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extractideakey(common, ideakey);
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des_set_odd_parity(deskey);
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mp_mfree(common);
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mp_mfree(secret);
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mp_mfree(public);
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mp_mfree(modulus);
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}
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/*
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* Generate a seed
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*/
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static void
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getseed(char *seed, int seedsize)
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{
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int i;
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srandomdev();
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for (i = 0; i < seedsize; i++) {
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seed[i] = random() & 0xff;
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}
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}
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/*
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* Generate a random public/secret key pair
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*/
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void
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genkeys(char *public, char *secret)
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{
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size_t i;
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# define BASEBITS (8*sizeof(short) - 1)
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# define BASE (1 << BASEBITS)
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MINT *pk = mp_itom(0);
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MINT *sk = mp_itom(0);
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MINT *tmp;
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MINT *base = mp_itom(BASE);
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MINT *root = mp_itom(PROOT);
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MINT *modulus = mp_xtom(HEXMODULUS);
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short r;
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unsigned short seed[KEYSIZE/BASEBITS + 1];
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char *xkey;
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getseed((char *)seed, sizeof(seed));
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for (i = 0; i < KEYSIZE/BASEBITS + 1; i++) {
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r = seed[i] % BASE;
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tmp = mp_itom(r);
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mp_mult(sk, base, sk);
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mp_madd(sk, tmp, sk);
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mp_mfree(tmp);
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}
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tmp = mp_itom(0);
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mp_mdiv(sk, modulus, tmp, sk);
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mp_mfree(tmp);
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mp_pow(root, sk, modulus, pk);
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xkey = mp_mtox(sk);
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adjust(secret, xkey);
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xkey = mp_mtox(pk);
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adjust(public, xkey);
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mp_mfree(sk);
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mp_mfree(base);
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mp_mfree(pk);
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mp_mfree(root);
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mp_mfree(modulus);
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}
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/*
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* Adjust the input key so that it is 0-filled on the left
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*/
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static void
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adjust(char keyout[HEXKEYBYTES+1], char *keyin)
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{
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char *p;
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char *s;
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for (p = keyin; *p; p++)
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;
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for (s = keyout + HEXKEYBYTES; p >= keyin; p--, s--) {
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*s = *p;
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}
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while (s >= keyout) {
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*s-- = '0';
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}
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}
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static char hextab[17] = "0123456789ABCDEF";
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/* given a DES key, cbc encrypt and translate input to terminated hex */
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void
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pk_encode(char *in, char *out, DesData *key)
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{
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char buf[256];
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DesData i;
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des_key_schedule k;
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int l,op,deslen;
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memset(&i,0,sizeof(i));
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memset(buf,0,sizeof(buf));
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deslen = ((strlen(in) + 7)/8)*8;
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des_key_sched(key, k);
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des_cbc_encrypt(in,buf,deslen, k,&i,DES_ENCRYPT);
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for (l=0,op=0;l<deslen;l++) {
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out[op++] = hextab[(buf[l] & 0xf0) >> 4];
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out[op++] = hextab[(buf[l] & 0x0f)];
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}
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out[op] = '\0';
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}
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/* given a DES key, translate input from hex and decrypt */
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void
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pk_decode(char *in, char *out, DesData *key)
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{
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char buf[256];
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DesData i;
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des_key_schedule k;
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int n1,n2,op;
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size_t l;
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memset(&i,0,sizeof(i));
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memset(buf,0,sizeof(buf));
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for (l=0,op=0;l<strlen(in)/2;l++,op+=2) {
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if (in[op] > '9')
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n1 = in[op] - 'A' + 10;
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else
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n1 = in[op] - '0';
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if (in[op+1] > '9')
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n2 = in[op+1] - 'A' + 10;
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else
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n2 = in[op+1] - '0';
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buf[l] = n1*16 +n2;
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}
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des_key_sched(key, k);
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des_cbc_encrypt(buf,out,strlen(in)/2, k,&i,DES_DECRYPT);
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out[strlen(in)/2] = '\0';
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}
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