161828Smarkm/* crypto/idea/i_cfb64.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. 8280297Sjkim * 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). 15280297Sjkim * 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. 22280297Sjkim * 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 :-). 37280297Sjkim * 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)" 40280297Sjkim * 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. 52280297Sjkim * 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> 6061828Smarkm#include "idea_lcl.h" 6161828Smarkm 62280297Sjkim/* 63280297Sjkim * The input and output encrypted as though 64bit cfb mode is being used. 64280297Sjkim * The extra state information to record how much of the 64bit block we have 65280297Sjkim * used is contained in *num; 6661828Smarkm */ 6761828Smarkm 6868654Skrisvoid idea_cfb64_encrypt(const unsigned char *in, unsigned char *out, 69280297Sjkim long length, IDEA_KEY_SCHEDULE *schedule, 70280297Sjkim unsigned char *ivec, int *num, int encrypt) 71280297Sjkim{ 72280297Sjkim register unsigned long v0, v1, t; 73280297Sjkim register int n = *num; 74280297Sjkim register long l = length; 75280297Sjkim unsigned long ti[2]; 76280297Sjkim unsigned char *iv, c, cc; 7761828Smarkm 78280297Sjkim iv = (unsigned char *)ivec; 79280297Sjkim if (encrypt) { 80280297Sjkim while (l--) { 81280297Sjkim if (n == 0) { 82280297Sjkim n2l(iv, v0); 83280297Sjkim ti[0] = v0; 84280297Sjkim n2l(iv, v1); 85280297Sjkim ti[1] = v1; 86280297Sjkim idea_encrypt((unsigned long *)ti, schedule); 87280297Sjkim iv = (unsigned char *)ivec; 88280297Sjkim t = ti[0]; 89280297Sjkim l2n(t, iv); 90280297Sjkim t = ti[1]; 91280297Sjkim l2n(t, iv); 92280297Sjkim iv = (unsigned char *)ivec; 93280297Sjkim } 94280297Sjkim c = *(in++) ^ iv[n]; 95280297Sjkim *(out++) = c; 96280297Sjkim iv[n] = c; 97280297Sjkim n = (n + 1) & 0x07; 98280297Sjkim } 99280297Sjkim } else { 100280297Sjkim while (l--) { 101280297Sjkim if (n == 0) { 102280297Sjkim n2l(iv, v0); 103280297Sjkim ti[0] = v0; 104280297Sjkim n2l(iv, v1); 105280297Sjkim ti[1] = v1; 106280297Sjkim idea_encrypt((unsigned long *)ti, schedule); 107280297Sjkim iv = (unsigned char *)ivec; 108280297Sjkim t = ti[0]; 109280297Sjkim l2n(t, iv); 110280297Sjkim t = ti[1]; 111280297Sjkim l2n(t, iv); 112280297Sjkim iv = (unsigned char *)ivec; 113280297Sjkim } 114280297Sjkim cc = *(in++); 115280297Sjkim c = iv[n]; 116280297Sjkim iv[n] = cc; 117280297Sjkim *(out++) = c ^ cc; 118280297Sjkim n = (n + 1) & 0x07; 119280297Sjkim } 120280297Sjkim } 121280297Sjkim v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; 122280297Sjkim *num = n; 123280297Sjkim} 124