i_cfb64.c revision 63249
1187423Sgonzo/* crypto/idea/i_cfb64.c */ 2187423Sgonzo/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3187423Sgonzo * All rights reserved. 4187423Sgonzo * 5187423Sgonzo * This package is an SSL implementation written 6187423Sgonzo * by Eric Young (eay@cryptsoft.com). 7187423Sgonzo * The implementation was written so as to conform with Netscapes SSL. 8187423Sgonzo * 9187423Sgonzo * This library is free for commercial and non-commercial use as long as 10187423Sgonzo * the following conditions are aheared to. The following conditions 11187423Sgonzo * apply to all code found in this distribution, be it the RC4, RSA, 12187423Sgonzo * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13187423Sgonzo * included with this distribution is covered by the same copyright terms 14187423Sgonzo * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15187423Sgonzo * 16187423Sgonzo * Copyright remains Eric Young's, and as such any Copyright notices in 17187423Sgonzo * the code are not to be removed. 18187423Sgonzo * If this package is used in a product, Eric Young should be given attribution 19187423Sgonzo * as the author of the parts of the library used. 20187423Sgonzo * This can be in the form of a textual message at program startup or 21187423Sgonzo * in documentation (online or textual) provided with the package. 22187423Sgonzo * 23187423Sgonzo * Redistribution and use in source and binary forms, with or without 24187423Sgonzo * modification, are permitted provided that the following conditions 25187423Sgonzo * are met: 26187423Sgonzo * 1. Redistributions of source code must retain the copyright 27187423Sgonzo * notice, this list of conditions and the following disclaimer. 28187423Sgonzo * 2. Redistributions in binary form must reproduce the above copyright 29187423Sgonzo * notice, this list of conditions and the following disclaimer in the 30187423Sgonzo * documentation and/or other materials provided with the distribution. 31230195Sadrian * 3. All advertising materials mentioning features or use of this software 32187423Sgonzo * must display the following acknowledgement: 33187423Sgonzo * "This product includes cryptographic software written by 34187423Sgonzo * Eric Young (eay@cryptsoft.com)" 35187423Sgonzo * The word 'cryptographic' can be left out if the rouines from the library 36187423Sgonzo * being used are not cryptographic related :-). 37187423Sgonzo * 4. If you include any Windows specific code (or a derivative thereof) from 38187423Sgonzo * the apps directory (application code) you must include an acknowledgement: 39187423Sgonzo * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40198562Sthompsa * 41187423Sgonzo * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42187423Sgonzo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43187423Sgonzo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44187423Sgonzo * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45192178Sgonzo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46192178Sgonzo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47187423Sgonzo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48187423Sgonzo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49223562Skevlo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50187423Sgonzo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51187423Sgonzo * SUCH DAMAGE. 52187423Sgonzo * 53187423Sgonzo * The licence and distribution terms for any publically available version or 54187423Sgonzo * derivative of this code cannot be changed. i.e. this code cannot simply be 55187456Sgonzo * copied and put under another distribution licence 56187423Sgonzo * [including the GNU Public Licence.] 57211476Sadrian * $FreeBSD: head/crypto/openssl/crypto/idea/i_cfb64.c 61828 2000-06-19 21:09:27Z markm $ 58211476Sadrian */ 59211476Sadrian 60223562Skevlo#include <openssl/idea.h> 61223562Skevlo#include "idea_lcl.h" 62202954Sgonzo 63202954Sgonzo/* The input and output encrypted as though 64bit cfb mode is being 64192178Sgonzo * used. The extra state information to record how much of the 65198562Sthompsa * 64bit block we have used is contained in *num; 66198562Sthompsa */ 67198562Sthompsa 68187423Sgonzovoid idea_cfb64_encrypt(unsigned char *in, unsigned char *out, long length, 69198562Sthompsa IDEA_KEY_SCHEDULE *schedule, unsigned char *ivec, int *num, 70198562Sthompsa int encrypt) 71198562Sthompsa { 72198562Sthompsa register unsigned long v0,v1,t; 73198562Sthompsa register int n= *num; 74198562Sthompsa register long l=length; 75198562Sthompsa unsigned long ti[2]; 76198562Sthompsa unsigned char *iv,c,cc; 77198562Sthompsa 78198562Sthompsa iv=(unsigned char *)ivec; 79198562Sthompsa if (encrypt) 80198562Sthompsa { 81198562Sthompsa while (l--) 82198562Sthompsa { 83198562Sthompsa if (n == 0) 84198562Sthompsa { 85198562Sthompsa n2l(iv,v0); ti[0]=v0; 86198562Sthompsa n2l(iv,v1); ti[1]=v1; 87198562Sthompsa idea_encrypt((unsigned long *)ti,schedule); 88198562Sthompsa iv=(unsigned char *)ivec; 89198562Sthompsa t=ti[0]; l2n(t,iv); 90198562Sthompsa t=ti[1]; l2n(t,iv); 91198562Sthompsa iv=(unsigned char *)ivec; 92198562Sthompsa } 93198562Sthompsa c= *(in++)^iv[n]; 94198562Sthompsa *(out++)=c; 95198562Sthompsa iv[n]=c; 96198562Sthompsa n=(n+1)&0x07; 97198562Sthompsa } 98198562Sthompsa } 99198562Sthompsa else 100198562Sthompsa { 101198562Sthompsa while (l--) 102187423Sgonzo { 103198669Srrs if (n == 0) 104198669Srrs { 105198669Srrs n2l(iv,v0); ti[0]=v0; 106198669Srrs n2l(iv,v1); ti[1]=v1; 107198669Srrs idea_encrypt((unsigned long *)ti,schedule); 108198669Srrs iv=(unsigned char *)ivec; 109187423Sgonzo t=ti[0]; l2n(t,iv); 110187423Sgonzo t=ti[1]; l2n(t,iv); 111211480Sadrian iv=(unsigned char *)ivec; 112187463Sgonzo } 113187463Sgonzo cc= *(in++); 114187463Sgonzo c=iv[n]; 115187423Sgonzo iv[n]=cc; 116187423Sgonzo *(out++)=c^cc; 117220056Sadrian n=(n+1)&0x07; 118220056Sadrian } 119220056Sadrian } 120220056Sadrian v0=v1=ti[0]=ti[1]=t=c=cc=0; 121220056Sadrian *num=n; 122220056Sadrian } 123220056Sadrian 124220056Sadrian