155714Skris/* crypto/des/cfb64enc.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280304Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280304Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280304Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280304Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280304Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280304Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include "des_locl.h" 6055714Skris 61280304Sjkim/* 62280304Sjkim * The input and output encrypted as though 64bit cfb mode is being used. 63280304Sjkim * The extra state information to record how much of the 64bit block we have 64280304Sjkim * used is contained in *num; 6555714Skris */ 6655714Skris 67109998Smarkmvoid DES_cfb64_encrypt(const unsigned char *in, unsigned char *out, 68280304Sjkim long length, DES_key_schedule *schedule, 69280304Sjkim DES_cblock *ivec, int *num, int enc) 70280304Sjkim{ 71280304Sjkim register DES_LONG v0, v1; 72280304Sjkim register long l = length; 73280304Sjkim register int n = *num; 74280304Sjkim DES_LONG ti[2]; 75280304Sjkim unsigned char *iv, c, cc; 7655714Skris 77280304Sjkim iv = &(*ivec)[0]; 78280304Sjkim if (enc) { 79280304Sjkim while (l--) { 80280304Sjkim if (n == 0) { 81280304Sjkim c2l(iv, v0); 82280304Sjkim ti[0] = v0; 83280304Sjkim c2l(iv, v1); 84280304Sjkim ti[1] = v1; 85280304Sjkim DES_encrypt1(ti, schedule, DES_ENCRYPT); 86280304Sjkim iv = &(*ivec)[0]; 87280304Sjkim v0 = ti[0]; 88280304Sjkim l2c(v0, iv); 89280304Sjkim v0 = ti[1]; 90280304Sjkim l2c(v0, iv); 91280304Sjkim iv = &(*ivec)[0]; 92280304Sjkim } 93280304Sjkim c = *(in++) ^ iv[n]; 94280304Sjkim *(out++) = c; 95280304Sjkim iv[n] = c; 96280304Sjkim n = (n + 1) & 0x07; 97280304Sjkim } 98280304Sjkim } else { 99280304Sjkim while (l--) { 100280304Sjkim if (n == 0) { 101280304Sjkim c2l(iv, v0); 102280304Sjkim ti[0] = v0; 103280304Sjkim c2l(iv, v1); 104280304Sjkim ti[1] = v1; 105280304Sjkim DES_encrypt1(ti, schedule, DES_ENCRYPT); 106280304Sjkim iv = &(*ivec)[0]; 107280304Sjkim v0 = ti[0]; 108280304Sjkim l2c(v0, iv); 109280304Sjkim v0 = ti[1]; 110280304Sjkim l2c(v0, iv); 111280304Sjkim iv = &(*ivec)[0]; 112280304Sjkim } 113280304Sjkim cc = *(in++); 114280304Sjkim c = iv[n]; 115280304Sjkim iv[n] = cc; 116280304Sjkim *(out++) = c ^ cc; 117280304Sjkim n = (n + 1) & 0x07; 118280304Sjkim } 119280304Sjkim } 120280304Sjkim v0 = v1 = ti[0] = ti[1] = c = cc = 0; 121280304Sjkim *num = n; 122280304Sjkim} 123