2 * Copyright (c) 1991, 1993
3 * Dave Safford. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
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17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * $FreeBSD: src/crypto/telnet/libtelnet/pk.c,v 1.2.2.4 2002/08/24 07:28:35 nsayer Exp $
31 * $DragonFly: src/crypto/telnet/libtelnet/pk.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
34 /* public key routines */
36 genkeys(char *public, char *secret)
37 common_key(char *secret, char *public, desData *deskey)
38 pk_encode(char *in, *out, DesData *deskey);
39 pk_decode(char *in, *out, DesData *deskey);
41 char public[HEXKEYBYTES + 1];
42 char secret[HEXKEYBYTES + 1];
46 #include <openssl/des.h>
55 static void adjust(char keyout[HEXKEYBYTES+1], char *keyin);
58 * Choose top 128 bits of the common key to use as our idea key.
61 extractideakey(MINT *ck, IdeaData *ideakey)
67 short base = (1 << 8);
73 for (i = 0; i < ((KEYSIZE - 128) / 8); i++) {
77 for (i = 0; i < 16; i++) {
86 * Choose middle 64 bits of the common key to use as our des key, possibly
87 * overwriting the lower order bits by setting parity.
90 extractdeskey(MINT *ck, DesData *deskey)
96 short base = (1 << 8);
102 for (i = 0; i < ((KEYSIZE - 64) / 2) / 8; i++) {
103 sdiv(a, base, a, &r);
106 for (i = 0; i < 8; i++) {
107 sdiv(a, base, a, &r);
115 * get common key from my secret key and his public key
118 common_key(char *xsecret, char *xpublic, IdeaData *ideakey, DesData *deskey)
123 MINT *modulus = xtom(HEXMODULUS);
125 public = xtom(xpublic);
126 secret = xtom(xsecret);
128 pow(public, secret, modulus, common);
129 extractdeskey(common, deskey);
130 extractideakey(common, ideakey);
131 des_set_odd_parity(deskey);
142 getseed(char *seed, int seedsize)
147 for (i = 0; i < seedsize; i++) {
148 seed[i] = random() & 0xff;
153 * Generate a random public/secret key pair
156 genkeys(char *public, char *secret)
160 # define BASEBITS (8*sizeof(short) - 1)
161 # define BASE (1 << BASEBITS)
166 MINT *base = itom(BASE);
167 MINT *root = itom(PROOT);
168 MINT *modulus = xtom(HEXMODULUS);
170 unsigned short seed[KEYSIZE/BASEBITS + 1];
173 getseed((char *)seed, sizeof(seed));
174 for (i = 0; i < KEYSIZE/BASEBITS + 1; i++) {
182 mdiv(sk, modulus, tmp, sk);
184 pow(root, sk, modulus, pk);
186 adjust(secret, xkey);
188 adjust(public, xkey);
197 * Adjust the input key so that it is 0-filled on the left
200 adjust(char keyout[HEXKEYBYTES+1], char *keyin)
205 for (p = keyin; *p; p++)
207 for (s = keyout + HEXKEYBYTES; p >= keyin; p--, s--) {
210 while (s >= keyout) {
215 static char hextab[17] = "0123456789ABCDEF";
217 /* given a DES key, cbc encrypt and translate input to terminated hex */
219 pk_encode(char *in, char *out, DesData *key)
226 memset(&i,0,sizeof(i));
227 memset(buf,0,sizeof(buf));
228 deslen = ((strlen(in) + 7)/8)*8;
229 des_key_sched(key, k);
230 des_cbc_encrypt(in,buf,deslen, k,&i,DES_ENCRYPT);
231 for (l=0,op=0;l<deslen;l++) {
232 out[op++] = hextab[(buf[l] & 0xf0) >> 4];
233 out[op++] = hextab[(buf[l] & 0x0f)];
238 /* given a DES key, translate input from hex and decrypt */
240 pk_decode(char *in, char *out, DesData *key)
248 memset(&i,0,sizeof(i));
249 memset(buf,0,sizeof(buf));
250 for (l=0,op=0;l<strlen(in)/2;l++,op+=2) {
252 n1 = in[op] - 'A' + 10;
256 n2 = in[op+1] - 'A' + 10;
261 des_key_sched(key, k);
262 des_cbc_encrypt(buf,out,strlen(in)/2, k,&i,DES_DECRYPT);
263 out[strlen(in)/2] = '\0';