155714Skris/* crypto/bf/bf_cfb64.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. 8296341Sdelphij * 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). 15296341Sdelphij * 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. 22296341Sdelphij * 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 :-). 37296341Sdelphij * 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)" 40296341Sdelphij * 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. 52296341Sdelphij * 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 <openssl/blowfish.h> 6055714Skris#include "bf_locl.h" 6155714Skris 62296341Sdelphij/* 63296341Sdelphij * The input and output encrypted as though 64bit cfb mode is being used. 64296341Sdelphij * The extra state information to record how much of the 64bit block we have 65296341Sdelphij * used is contained in *num; 6655714Skris */ 6755714Skris 68296341Sdelphijvoid BF_cfb64_encrypt(const unsigned char *in, unsigned char *out, 69296341Sdelphij long length, const BF_KEY *schedule, 70296341Sdelphij unsigned char *ivec, int *num, int encrypt) 71296341Sdelphij{ 72296341Sdelphij register BF_LONG v0, v1, t; 73296341Sdelphij register int n = *num; 74296341Sdelphij register long l = length; 75296341Sdelphij BF_LONG ti[2]; 76296341Sdelphij unsigned char *iv, c, cc; 7755714Skris 78296341Sdelphij iv = (unsigned char *)ivec; 79296341Sdelphij if (encrypt) { 80296341Sdelphij while (l--) { 81296341Sdelphij if (n == 0) { 82296341Sdelphij n2l(iv, v0); 83296341Sdelphij ti[0] = v0; 84296341Sdelphij n2l(iv, v1); 85296341Sdelphij ti[1] = v1; 86296341Sdelphij BF_encrypt((BF_LONG *)ti, schedule); 87296341Sdelphij iv = (unsigned char *)ivec; 88296341Sdelphij t = ti[0]; 89296341Sdelphij l2n(t, iv); 90296341Sdelphij t = ti[1]; 91296341Sdelphij l2n(t, iv); 92296341Sdelphij iv = (unsigned char *)ivec; 93296341Sdelphij } 94296341Sdelphij c = *(in++) ^ iv[n]; 95296341Sdelphij *(out++) = c; 96296341Sdelphij iv[n] = c; 97296341Sdelphij n = (n + 1) & 0x07; 98296341Sdelphij } 99296341Sdelphij } else { 100296341Sdelphij while (l--) { 101296341Sdelphij if (n == 0) { 102296341Sdelphij n2l(iv, v0); 103296341Sdelphij ti[0] = v0; 104296341Sdelphij n2l(iv, v1); 105296341Sdelphij ti[1] = v1; 106296341Sdelphij BF_encrypt((BF_LONG *)ti, schedule); 107296341Sdelphij iv = (unsigned char *)ivec; 108296341Sdelphij t = ti[0]; 109296341Sdelphij l2n(t, iv); 110296341Sdelphij t = ti[1]; 111296341Sdelphij l2n(t, iv); 112296341Sdelphij iv = (unsigned char *)ivec; 113296341Sdelphij } 114296341Sdelphij cc = *(in++); 115296341Sdelphij c = iv[n]; 116296341Sdelphij iv[n] = cc; 117296341Sdelphij *(out++) = c ^ cc; 118296341Sdelphij n = (n + 1) & 0x07; 119296341Sdelphij } 120296341Sdelphij } 121296341Sdelphij v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; 122296341Sdelphij *num = n; 123296341Sdelphij} 124