1/* crypto/idea/i_skey.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <openssl/crypto.h> 60#include <openssl/idea.h> 61#include "idea_lcl.h" 62 63static IDEA_INT inverse(unsigned int xin); 64void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) 65#ifdef OPENSSL_FIPS 66{ 67 fips_cipher_abort(IDEA); 68 private_idea_set_encrypt_key(key, ks); 69} 70 71void private_idea_set_encrypt_key(const unsigned char *key, 72 IDEA_KEY_SCHEDULE *ks) 73#endif 74{ 75 int i; 76 register IDEA_INT *kt, *kf, r0, r1, r2; 77 78 kt = &(ks->data[0][0]); 79 n2s(key, kt[0]); 80 n2s(key, kt[1]); 81 n2s(key, kt[2]); 82 n2s(key, kt[3]); 83 n2s(key, kt[4]); 84 n2s(key, kt[5]); 85 n2s(key, kt[6]); 86 n2s(key, kt[7]); 87 88 kf = kt; 89 kt += 8; 90 for (i = 0; i < 6; i++) { 91 r2 = kf[1]; 92 r1 = kf[2]; 93 *(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff; 94 r0 = kf[3]; 95 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; 96 r1 = kf[4]; 97 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; 98 r0 = kf[5]; 99 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; 100 r1 = kf[6]; 101 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; 102 r0 = kf[7]; 103 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff; 104 r1 = kf[0]; 105 if (i >= 5) 106 break; 107 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff; 108 *(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff; 109 kf += 8; 110 } 111} 112 113void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk) 114{ 115 int r; 116 register IDEA_INT *fp, *tp, t; 117 118 tp = &(dk->data[0][0]); 119 fp = &(ek->data[8][0]); 120 for (r = 0; r < 9; r++) { 121 *(tp++) = inverse(fp[0]); 122 *(tp++) = ((int)(0x10000L - fp[2]) & 0xffff); 123 *(tp++) = ((int)(0x10000L - fp[1]) & 0xffff); 124 *(tp++) = inverse(fp[3]); 125 if (r == 8) 126 break; 127 fp -= 6; 128 *(tp++) = fp[4]; 129 *(tp++) = fp[5]; 130 } 131 132 tp = &(dk->data[0][0]); 133 t = tp[1]; 134 tp[1] = tp[2]; 135 tp[2] = t; 136 137 t = tp[49]; 138 tp[49] = tp[50]; 139 tp[50] = t; 140} 141 142/* taken directly from the 'paper' I'll have a look at it later */ 143static IDEA_INT inverse(unsigned int xin) 144{ 145 long n1, n2, q, r, b1, b2, t; 146 147 if (xin == 0) 148 b2 = 0; 149 else { 150 n1 = 0x10001; 151 n2 = xin; 152 b2 = 1; 153 b1 = 0; 154 155 do { 156 r = (n1 % n2); 157 q = (n1 - r) / n2; 158 if (r == 0) { 159 if (b2 < 0) 160 b2 = 0x10001 + b2; 161 } else { 162 n1 = n2; 163 n2 = r; 164 t = b2; 165 b2 = b1 - q * b2; 166 b1 = t; 167 } 168 } while (r != 0); 169 } 170 return ((IDEA_INT) b2); 171} 172