1 /* $OpenBSD: i_cbc.c,v 1.2 2014/06/12 15:49:29 deraadt Exp $ */ 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/idea.h> 60 #include "idea_lcl.h" 61 62 void idea_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 63 IDEA_KEY_SCHEDULE *ks, unsigned char *iv, int encrypt) 64 { 65 unsigned long tin0,tin1; 66 unsigned long tout0,tout1,xor0,xor1; 67 long l=length; 68 unsigned long tin[2]; 69 70 if (encrypt) 71 { 72 n2l(iv,tout0); 73 n2l(iv,tout1); 74 iv-=8; 75 for (l-=8; l>=0; l-=8) 76 { 77 n2l(in,tin0); 78 n2l(in,tin1); 79 tin0^=tout0; 80 tin1^=tout1; 81 tin[0]=tin0; 82 tin[1]=tin1; 83 idea_encrypt(tin,ks); 84 tout0=tin[0]; l2n(tout0,out); 85 tout1=tin[1]; l2n(tout1,out); 86 } 87 if (l != -8) 88 { 89 n2ln(in,tin0,tin1,l+8); 90 tin0^=tout0; 91 tin1^=tout1; 92 tin[0]=tin0; 93 tin[1]=tin1; 94 idea_encrypt(tin,ks); 95 tout0=tin[0]; l2n(tout0,out); 96 tout1=tin[1]; l2n(tout1,out); 97 } 98 l2n(tout0,iv); 99 l2n(tout1,iv); 100 } 101 else 102 { 103 n2l(iv,xor0); 104 n2l(iv,xor1); 105 iv-=8; 106 for (l-=8; l>=0; l-=8) 107 { 108 n2l(in,tin0); tin[0]=tin0; 109 n2l(in,tin1); tin[1]=tin1; 110 idea_encrypt(tin,ks); 111 tout0=tin[0]^xor0; 112 tout1=tin[1]^xor1; 113 l2n(tout0,out); 114 l2n(tout1,out); 115 xor0=tin0; 116 xor1=tin1; 117 } 118 if (l != -8) 119 { 120 n2l(in,tin0); tin[0]=tin0; 121 n2l(in,tin1); tin[1]=tin1; 122 idea_encrypt(tin,ks); 123 tout0=tin[0]^xor0; 124 tout1=tin[1]^xor1; 125 l2nn(tout0,tout1,out,l+8); 126 xor0=tin0; 127 xor1=tin1; 128 } 129 l2n(xor0,iv); 130 l2n(xor1,iv); 131 } 132 tin0=tin1=tout0=tout1=xor0=xor1=0; 133 tin[0]=tin[1]=0; 134 } 135 136 void idea_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key) 137 { 138 IDEA_INT *p; 139 unsigned long x1,x2,x3,x4,t0,t1,ul; 140 141 x2=d[0]; 142 x1=(x2>>16); 143 x4=d[1]; 144 x3=(x4>>16); 145 146 p= &(key->data[0][0]); 147 148 E_IDEA(0); 149 E_IDEA(1); 150 E_IDEA(2); 151 E_IDEA(3); 152 E_IDEA(4); 153 E_IDEA(5); 154 E_IDEA(6); 155 E_IDEA(7); 156 157 x1&=0xffff; 158 idea_mul(x1,x1,*p,ul); p++; 159 160 t0= x3+ *(p++); 161 t1= x2+ *(p++); 162 163 x4&=0xffff; 164 idea_mul(x4,x4,*p,ul); 165 166 d[0]=(t0&0xffff)|((x1&0xffff)<<16); 167 d[1]=(x4&0xffff)|((t1&0xffff)<<16); 168 } 169