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 63 static IDEA_INT inverse(unsigned int xin); 64 void 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 void private_idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) 71 #endif 72 { 73 int i; 74 register IDEA_INT *kt,*kf,r0,r1,r2; 75 76 kt= &(ks->data[0][0]); 77 n2s(key,kt[0]); n2s(key,kt[1]); n2s(key,kt[2]); n2s(key,kt[3]); 78 n2s(key,kt[4]); n2s(key,kt[5]); n2s(key,kt[6]); n2s(key,kt[7]); 79 80 kf=kt; 81 kt+=8; 82 for (i=0; i<6; i++) 83 { 84 r2= kf[1]; 85 r1= kf[2]; 86 *(kt++)= ((r2<<9) | (r1>>7))&0xffff; 87 r0= kf[3]; 88 *(kt++)= ((r1<<9) | (r0>>7))&0xffff; 89 r1= kf[4]; 90 *(kt++)= ((r0<<9) | (r1>>7))&0xffff; 91 r0= kf[5]; 92 *(kt++)= ((r1<<9) | (r0>>7))&0xffff; 93 r1= kf[6]; 94 *(kt++)= ((r0<<9) | (r1>>7))&0xffff; 95 r0= kf[7]; 96 *(kt++)= ((r1<<9) | (r0>>7))&0xffff; 97 r1= kf[0]; 98 if (i >= 5) break; 99 *(kt++)= ((r0<<9) | (r1>>7))&0xffff; 100 *(kt++)= ((r1<<9) | (r2>>7))&0xffff; 101 kf+=8; 102 } 103 } 104 105 void idea_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk) 106 { 107 int r; 108 register IDEA_INT *fp,*tp,t; 109 110 tp= &(dk->data[0][0]); 111 fp= &(ek->data[8][0]); 112 for (r=0; r<9; r++) 113 { 114 *(tp++)=inverse(fp[0]); 115 *(tp++)=((int)(0x10000L-fp[2])&0xffff); 116 *(tp++)=((int)(0x10000L-fp[1])&0xffff); 117 *(tp++)=inverse(fp[3]); 118 if (r == 8) break; 119 fp-=6; 120 *(tp++)=fp[4]; 121 *(tp++)=fp[5]; 122 } 123 124 tp= &(dk->data[0][0]); 125 t=tp[1]; 126 tp[1]=tp[2]; 127 tp[2]=t; 128 129 t=tp[49]; 130 tp[49]=tp[50]; 131 tp[50]=t; 132 } 133 134 /* taken directly from the 'paper' I'll have a look at it later */ 135 static IDEA_INT inverse(unsigned int xin) 136 { 137 long n1,n2,q,r,b1,b2,t; 138 139 if (xin == 0) 140 b2=0; 141 else 142 { 143 n1=0x10001; 144 n2=xin; 145 b2=1; 146 b1=0; 147 148 do { 149 r=(n1%n2); 150 q=(n1-r)/n2; 151 if (r == 0) 152 { if (b2 < 0) b2=0x10001+b2; } 153 else 154 { 155 n1=n2; 156 n2=r; 157 t=b2; 158 b2=b1-q*b2; 159 b1=t; 160 } 161 } while (r != 0); 162 } 163 return((IDEA_INT)b2); 164 } 165