bf_cfb64.c revision 55714
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. 855714Skris * 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). 1555714Skris * 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. 2255714Skris * 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 :-). 3755714Skris * 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)" 4055714Skris * 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. 5255714Skris * 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 6255714Skris/* The input and output encrypted as though 64bit cfb mode is being 6355714Skris * used. The extra state information to record how much of the 6455714Skris * 64bit block we have used is contained in *num; 6555714Skris */ 6655714Skris 6755714Skrisvoid BF_cfb64_encrypt(unsigned char *in, unsigned char *out, long length, 6855714Skris BF_KEY *schedule, unsigned char *ivec, int *num, int encrypt) 6955714Skris { 7055714Skris register BF_LONG v0,v1,t; 7155714Skris register int n= *num; 7255714Skris register long l=length; 7355714Skris BF_LONG ti[2]; 7455714Skris unsigned char *iv,c,cc; 7555714Skris 7655714Skris iv=(unsigned char *)ivec; 7755714Skris if (encrypt) 7855714Skris { 7955714Skris while (l--) 8055714Skris { 8155714Skris if (n == 0) 8255714Skris { 8355714Skris n2l(iv,v0); ti[0]=v0; 8455714Skris n2l(iv,v1); ti[1]=v1; 8555714Skris BF_encrypt((BF_LONG *)ti,schedule); 8655714Skris iv=(unsigned char *)ivec; 8755714Skris t=ti[0]; l2n(t,iv); 8855714Skris t=ti[1]; l2n(t,iv); 8955714Skris iv=(unsigned char *)ivec; 9055714Skris } 9155714Skris c= *(in++)^iv[n]; 9255714Skris *(out++)=c; 9355714Skris iv[n]=c; 9455714Skris n=(n+1)&0x07; 9555714Skris } 9655714Skris } 9755714Skris else 9855714Skris { 9955714Skris while (l--) 10055714Skris { 10155714Skris if (n == 0) 10255714Skris { 10355714Skris n2l(iv,v0); ti[0]=v0; 10455714Skris n2l(iv,v1); ti[1]=v1; 10555714Skris BF_encrypt((BF_LONG *)ti,schedule); 10655714Skris iv=(unsigned char *)ivec; 10755714Skris t=ti[0]; l2n(t,iv); 10855714Skris t=ti[1]; l2n(t,iv); 10955714Skris iv=(unsigned char *)ivec; 11055714Skris } 11155714Skris cc= *(in++); 11255714Skris c=iv[n]; 11355714Skris iv[n]=cc; 11455714Skris *(out++)=c^cc; 11555714Skris n=(n+1)&0x07; 11655714Skris } 11755714Skris } 11855714Skris v0=v1=ti[0]=ti[1]=t=c=cc=0; 11955714Skris *num=n; 12055714Skris } 12155714Skris 122