1*0Sstevel@tonic-gate /* crypto/idea/i_skey.c */
2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3*0Sstevel@tonic-gate * All rights reserved.
4*0Sstevel@tonic-gate *
5*0Sstevel@tonic-gate * This package is an SSL implementation written
6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com).
7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as
10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions
11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA,
12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms
14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15*0Sstevel@tonic-gate *
16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in
17*0Sstevel@tonic-gate * the code are not to be removed.
18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution
19*0Sstevel@tonic-gate * as the author of the parts of the library used.
20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or
21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package.
22*0Sstevel@tonic-gate *
23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions
25*0Sstevel@tonic-gate * are met:
26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright
27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software
32*0Sstevel@tonic-gate * must display the following acknowledgement:
33*0Sstevel@tonic-gate * "This product includes cryptographic software written by
34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)"
35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library
36*0Sstevel@tonic-gate * being used are not cryptographic related :-).
37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from
38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement:
39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40*0Sstevel@tonic-gate *
41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51*0Sstevel@tonic-gate * SUCH DAMAGE.
52*0Sstevel@tonic-gate *
53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or
54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be
55*0Sstevel@tonic-gate * copied and put under another distribution licence
56*0Sstevel@tonic-gate * [including the GNU Public Licence.]
57*0Sstevel@tonic-gate */
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate #include <openssl/idea.h>
60*0Sstevel@tonic-gate #include "idea_lcl.h"
61*0Sstevel@tonic-gate
62*0Sstevel@tonic-gate static IDEA_INT inverse(unsigned int xin);
idea_set_encrypt_key(const unsigned char * key,IDEA_KEY_SCHEDULE * ks)63*0Sstevel@tonic-gate void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
64*0Sstevel@tonic-gate {
65*0Sstevel@tonic-gate int i;
66*0Sstevel@tonic-gate register IDEA_INT *kt,*kf,r0,r1,r2;
67*0Sstevel@tonic-gate
68*0Sstevel@tonic-gate kt= &(ks->data[0][0]);
69*0Sstevel@tonic-gate n2s(key,kt[0]); n2s(key,kt[1]); n2s(key,kt[2]); n2s(key,kt[3]);
70*0Sstevel@tonic-gate n2s(key,kt[4]); n2s(key,kt[5]); n2s(key,kt[6]); n2s(key,kt[7]);
71*0Sstevel@tonic-gate
72*0Sstevel@tonic-gate kf=kt;
73*0Sstevel@tonic-gate kt+=8;
74*0Sstevel@tonic-gate for (i=0; i<6; i++)
75*0Sstevel@tonic-gate {
76*0Sstevel@tonic-gate r2= kf[1];
77*0Sstevel@tonic-gate r1= kf[2];
78*0Sstevel@tonic-gate *(kt++)= ((r2<<9) | (r1>>7))&0xffff;
79*0Sstevel@tonic-gate r0= kf[3];
80*0Sstevel@tonic-gate *(kt++)= ((r1<<9) | (r0>>7))&0xffff;
81*0Sstevel@tonic-gate r1= kf[4];
82*0Sstevel@tonic-gate *(kt++)= ((r0<<9) | (r1>>7))&0xffff;
83*0Sstevel@tonic-gate r0= kf[5];
84*0Sstevel@tonic-gate *(kt++)= ((r1<<9) | (r0>>7))&0xffff;
85*0Sstevel@tonic-gate r1= kf[6];
86*0Sstevel@tonic-gate *(kt++)= ((r0<<9) | (r1>>7))&0xffff;
87*0Sstevel@tonic-gate r0= kf[7];
88*0Sstevel@tonic-gate *(kt++)= ((r1<<9) | (r0>>7))&0xffff;
89*0Sstevel@tonic-gate r1= kf[0];
90*0Sstevel@tonic-gate if (i >= 5) break;
91*0Sstevel@tonic-gate *(kt++)= ((r0<<9) | (r1>>7))&0xffff;
92*0Sstevel@tonic-gate *(kt++)= ((r1<<9) | (r2>>7))&0xffff;
93*0Sstevel@tonic-gate kf+=8;
94*0Sstevel@tonic-gate }
95*0Sstevel@tonic-gate }
96*0Sstevel@tonic-gate
idea_set_decrypt_key(IDEA_KEY_SCHEDULE * ek,IDEA_KEY_SCHEDULE * dk)97*0Sstevel@tonic-gate void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk)
98*0Sstevel@tonic-gate {
99*0Sstevel@tonic-gate int r;
100*0Sstevel@tonic-gate register IDEA_INT *fp,*tp,t;
101*0Sstevel@tonic-gate
102*0Sstevel@tonic-gate tp= &(dk->data[0][0]);
103*0Sstevel@tonic-gate fp= &(ek->data[8][0]);
104*0Sstevel@tonic-gate for (r=0; r<9; r++)
105*0Sstevel@tonic-gate {
106*0Sstevel@tonic-gate *(tp++)=inverse(fp[0]);
107*0Sstevel@tonic-gate *(tp++)=((int)(0x10000L-fp[2])&0xffff);
108*0Sstevel@tonic-gate *(tp++)=((int)(0x10000L-fp[1])&0xffff);
109*0Sstevel@tonic-gate *(tp++)=inverse(fp[3]);
110*0Sstevel@tonic-gate if (r == 8) break;
111*0Sstevel@tonic-gate fp-=6;
112*0Sstevel@tonic-gate *(tp++)=fp[4];
113*0Sstevel@tonic-gate *(tp++)=fp[5];
114*0Sstevel@tonic-gate }
115*0Sstevel@tonic-gate
116*0Sstevel@tonic-gate tp= &(dk->data[0][0]);
117*0Sstevel@tonic-gate t=tp[1];
118*0Sstevel@tonic-gate tp[1]=tp[2];
119*0Sstevel@tonic-gate tp[2]=t;
120*0Sstevel@tonic-gate
121*0Sstevel@tonic-gate t=tp[49];
122*0Sstevel@tonic-gate tp[49]=tp[50];
123*0Sstevel@tonic-gate tp[50]=t;
124*0Sstevel@tonic-gate }
125*0Sstevel@tonic-gate
126*0Sstevel@tonic-gate /* taken directly from the 'paper' I'll have a look at it later */
inverse(unsigned int xin)127*0Sstevel@tonic-gate static IDEA_INT inverse(unsigned int xin)
128*0Sstevel@tonic-gate {
129*0Sstevel@tonic-gate long n1,n2,q,r,b1,b2,t;
130*0Sstevel@tonic-gate
131*0Sstevel@tonic-gate if (xin == 0)
132*0Sstevel@tonic-gate b2=0;
133*0Sstevel@tonic-gate else
134*0Sstevel@tonic-gate {
135*0Sstevel@tonic-gate n1=0x10001;
136*0Sstevel@tonic-gate n2=xin;
137*0Sstevel@tonic-gate b2=1;
138*0Sstevel@tonic-gate b1=0;
139*0Sstevel@tonic-gate
140*0Sstevel@tonic-gate do {
141*0Sstevel@tonic-gate r=(n1%n2);
142*0Sstevel@tonic-gate q=(n1-r)/n2;
143*0Sstevel@tonic-gate if (r == 0)
144*0Sstevel@tonic-gate { if (b2 < 0) b2=0x10001+b2; }
145*0Sstevel@tonic-gate else
146*0Sstevel@tonic-gate {
147*0Sstevel@tonic-gate n1=n2;
148*0Sstevel@tonic-gate n2=r;
149*0Sstevel@tonic-gate t=b2;
150*0Sstevel@tonic-gate b2=b1-q*b2;
151*0Sstevel@tonic-gate b1=t;
152*0Sstevel@tonic-gate }
153*0Sstevel@tonic-gate } while (r != 0);
154*0Sstevel@tonic-gate }
155*0Sstevel@tonic-gate return((IDEA_INT)b2);
156*0Sstevel@tonic-gate }
157