1/* crypto/idea/i_cbc.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/idea.h> 60#include "idea_lcl.h" 61 62void idea_cbc_encrypt(const unsigned char *in, unsigned char *out, 63 long length, IDEA_KEY_SCHEDULE *ks, unsigned char *iv, 64 int encrypt) 65{ 66 register unsigned long tin0, tin1; 67 register unsigned long tout0, tout1, xor0, xor1; 68 register long l = length; 69 unsigned long tin[2]; 70 71 if (encrypt) { 72 n2l(iv, tout0); 73 n2l(iv, tout1); 74 iv -= 8; 75 for (l -= 8; l >= 0; l -= 8) { 76 n2l(in, tin0); 77 n2l(in, tin1); 78 tin0 ^= tout0; 79 tin1 ^= tout1; 80 tin[0] = tin0; 81 tin[1] = tin1; 82 idea_encrypt(tin, ks); 83 tout0 = tin[0]; 84 l2n(tout0, out); 85 tout1 = tin[1]; 86 l2n(tout1, out); 87 } 88 if (l != -8) { 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]; 96 l2n(tout0, out); 97 tout1 = tin[1]; 98 l2n(tout1, out); 99 } 100 l2n(tout0, iv); 101 l2n(tout1, iv); 102 } else { 103 n2l(iv, xor0); 104 n2l(iv, xor1); 105 iv -= 8; 106 for (l -= 8; l >= 0; l -= 8) { 107 n2l(in, tin0); 108 tin[0] = tin0; 109 n2l(in, tin1); 110 tin[1] = tin1; 111 idea_encrypt(tin, ks); 112 tout0 = tin[0] ^ xor0; 113 tout1 = tin[1] ^ xor1; 114 l2n(tout0, out); 115 l2n(tout1, out); 116 xor0 = tin0; 117 xor1 = tin1; 118 } 119 if (l != -8) { 120 n2l(in, tin0); 121 tin[0] = tin0; 122 n2l(in, tin1); 123 tin[1] = tin1; 124 idea_encrypt(tin, ks); 125 tout0 = tin[0] ^ xor0; 126 tout1 = tin[1] ^ xor1; 127 l2nn(tout0, tout1, out, l + 8); 128 xor0 = tin0; 129 xor1 = tin1; 130 } 131 l2n(xor0, iv); 132 l2n(xor1, iv); 133 } 134 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 135 tin[0] = tin[1] = 0; 136} 137 138void idea_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key) 139{ 140 register IDEA_INT *p; 141 register unsigned long x1, x2, x3, x4, t0, t1, ul; 142 143 x2 = d[0]; 144 x1 = (x2 >> 16); 145 x4 = d[1]; 146 x3 = (x4 >> 16); 147 148 p = &(key->data[0][0]); 149 150 E_IDEA(0); 151 E_IDEA(1); 152 E_IDEA(2); 153 E_IDEA(3); 154 E_IDEA(4); 155 E_IDEA(5); 156 E_IDEA(6); 157 E_IDEA(7); 158 159 x1 &= 0xffff; 160 idea_mul(x1, x1, *p, ul); 161 p++; 162 163 t0 = x3 + *(p++); 164 t1 = x2 + *(p++); 165 166 x4 &= 0xffff; 167 idea_mul(x4, x4, *p, ul); 168 169 d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16); 170 d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16); 171} 172