161828Smarkm/* crypto/idea/i_skey.c */ 261828Smarkm/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 361828Smarkm * All rights reserved. 461828Smarkm * 561828Smarkm * This package is an SSL implementation written 661828Smarkm * by Eric Young (eay@cryptsoft.com). 761828Smarkm * The implementation was written so as to conform with Netscapes SSL. 8296465Sdelphij * 961828Smarkm * This library is free for commercial and non-commercial use as long as 1061828Smarkm * the following conditions are aheared to. The following conditions 1161828Smarkm * apply to all code found in this distribution, be it the RC4, RSA, 1261828Smarkm * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1361828Smarkm * included with this distribution is covered by the same copyright terms 1461828Smarkm * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15296465Sdelphij * 1661828Smarkm * Copyright remains Eric Young's, and as such any Copyright notices in 1761828Smarkm * the code are not to be removed. 1861828Smarkm * If this package is used in a product, Eric Young should be given attribution 1961828Smarkm * as the author of the parts of the library used. 2061828Smarkm * This can be in the form of a textual message at program startup or 2161828Smarkm * in documentation (online or textual) provided with the package. 22296465Sdelphij * 2361828Smarkm * Redistribution and use in source and binary forms, with or without 2461828Smarkm * modification, are permitted provided that the following conditions 2561828Smarkm * are met: 2661828Smarkm * 1. Redistributions of source code must retain the copyright 2761828Smarkm * notice, this list of conditions and the following disclaimer. 2861828Smarkm * 2. Redistributions in binary form must reproduce the above copyright 2961828Smarkm * notice, this list of conditions and the following disclaimer in the 3061828Smarkm * documentation and/or other materials provided with the distribution. 3161828Smarkm * 3. All advertising materials mentioning features or use of this software 3261828Smarkm * must display the following acknowledgement: 3361828Smarkm * "This product includes cryptographic software written by 3461828Smarkm * Eric Young (eay@cryptsoft.com)" 3561828Smarkm * The word 'cryptographic' can be left out if the rouines from the library 3661828Smarkm * being used are not cryptographic related :-). 37296465Sdelphij * 4. If you include any Windows specific code (or a derivative thereof) from 3861828Smarkm * the apps directory (application code) you must include an acknowledgement: 3961828Smarkm * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40296465Sdelphij * 4161828Smarkm * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4261828Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4361828Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4461828Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4561828Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4661828Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4761828Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4861828Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4961828Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5061828Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5161828Smarkm * SUCH DAMAGE. 52296465Sdelphij * 5361828Smarkm * The licence and distribution terms for any publically available version or 5461828Smarkm * derivative of this code cannot be changed. i.e. this code cannot simply be 5561828Smarkm * copied and put under another distribution licence 5661828Smarkm * [including the GNU Public Licence.] 5761828Smarkm */ 5861828Smarkm 5961828Smarkm#include <openssl/idea.h> 60194206Ssimon#include <openssl/crypto.h> 61194206Ssimon#ifdef OPENSSL_FIPS 62296465Sdelphij# include <openssl/fips.h> 63194206Ssimon#endif 64194206Ssimon 6561828Smarkm#include "idea_lcl.h" 6661828Smarkm 6761828Smarkmstatic IDEA_INT inverse(unsigned int xin); 68194206Ssimon 69194206Ssimon#ifdef OPENSSL_FIPS 7068654Skrisvoid idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) 71296465Sdelphij{ 72296465Sdelphij if (FIPS_mode()) 73296465Sdelphij FIPS_BAD_ABORT(IDEA) 74296465Sdelphij private_idea_set_encrypt_key(key, ks); 75296465Sdelphij} 76296465Sdelphij 77194206Ssimonvoid private_idea_set_encrypt_key(const unsigned char *key, 78296465Sdelphij IDEA_KEY_SCHEDULE *ks) 79194206Ssimon#else 80194206Ssimonvoid idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) 81194206Ssimon#endif 82296465Sdelphij{ 83296465Sdelphij int i; 84296465Sdelphij register IDEA_INT *kt, *kf, r0, r1, r2; 8561828Smarkm 86296465Sdelphij kt = &(ks->data[0][0]); 87296465Sdelphij n2s(key, kt[0]); 88296465Sdelphij n2s(key, kt[1]); 89296465Sdelphij n2s(key, kt[2]); 90296465Sdelphij n2s(key, kt[3]); 91296465Sdelphij n2s(key, kt[4]); 92296465Sdelphij n2s(key, kt[5]); 93296465Sdelphij n2s(key, kt[6]); 94296465Sdelphij n2s(key, kt[7]); 9561828Smarkm 96296465Sdelphij kf = kt; 97296465Sdelphij kt += 8; 98296465Sdelphij for (i = 0; i < 6; i++) { 99296465Sdelphij r2 = kf[1]; 100296465Sdelphij r1 = kf[2]; 101296465Sdelphij *(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff; 102296465Sdelphij r0 = kf[3]; 103296465Sdelphij *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; 104296465Sdelphij r1 = kf[4]; 105296465Sdelphij *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; 106296465Sdelphij r0 = kf[5]; 107296465Sdelphij *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; 108296465Sdelphij r1 = kf[6]; 109296465Sdelphij *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; 110296465Sdelphij r0 = kf[7]; 111296465Sdelphij *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; 112296465Sdelphij r1 = kf[0]; 113296465Sdelphij if (i >= 5) 114296465Sdelphij break; 115296465Sdelphij *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; 116296465Sdelphij *(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff; 117296465Sdelphij kf += 8; 118296465Sdelphij } 119296465Sdelphij} 12061828Smarkm 121160817Ssimonvoid idea_set_decrypt_key(const IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk) 122296465Sdelphij{ 123296465Sdelphij int r; 124296465Sdelphij register IDEA_INT *tp, t; 125296465Sdelphij const IDEA_INT *fp; 12661828Smarkm 127296465Sdelphij tp = &(dk->data[0][0]); 128296465Sdelphij fp = &(ek->data[8][0]); 129296465Sdelphij for (r = 0; r < 9; r++) { 130296465Sdelphij *(tp++) = inverse(fp[0]); 131296465Sdelphij *(tp++) = ((int)(0x10000L - fp[2]) & 0xffff); 132296465Sdelphij *(tp++) = ((int)(0x10000L - fp[1]) & 0xffff); 133296465Sdelphij *(tp++) = inverse(fp[3]); 134296465Sdelphij if (r == 8) 135296465Sdelphij break; 136296465Sdelphij fp -= 6; 137296465Sdelphij *(tp++) = fp[4]; 138296465Sdelphij *(tp++) = fp[5]; 139296465Sdelphij } 14061828Smarkm 141296465Sdelphij tp = &(dk->data[0][0]); 142296465Sdelphij t = tp[1]; 143296465Sdelphij tp[1] = tp[2]; 144296465Sdelphij tp[2] = t; 14561828Smarkm 146296465Sdelphij t = tp[49]; 147296465Sdelphij tp[49] = tp[50]; 148296465Sdelphij tp[50] = t; 149296465Sdelphij} 15061828Smarkm 15161828Smarkm/* taken directly from the 'paper' I'll have a look at it later */ 15261828Smarkmstatic IDEA_INT inverse(unsigned int xin) 153296465Sdelphij{ 154296465Sdelphij long n1, n2, q, r, b1, b2, t; 15561828Smarkm 156296465Sdelphij if (xin == 0) 157296465Sdelphij b2 = 0; 158296465Sdelphij else { 159296465Sdelphij n1 = 0x10001; 160296465Sdelphij n2 = xin; 161296465Sdelphij b2 = 1; 162296465Sdelphij b1 = 0; 16361828Smarkm 164296465Sdelphij do { 165296465Sdelphij r = (n1 % n2); 166296465Sdelphij q = (n1 - r) / n2; 167296465Sdelphij if (r == 0) { 168296465Sdelphij if (b2 < 0) 169296465Sdelphij b2 = 0x10001 + b2; 170296465Sdelphij } else { 171296465Sdelphij n1 = n2; 172296465Sdelphij n2 = r; 173296465Sdelphij t = b2; 174296465Sdelphij b2 = b1 - q * b2; 175296465Sdelphij b1 = t; 176296465Sdelphij } 177296465Sdelphij } while (r != 0); 178296465Sdelphij } 179296465Sdelphij return ((IDEA_INT) b2); 180296465Sdelphij} 181