cfb64ede.c revision 55714
155714Skris/* crypto/des/cfb64ede.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 "des_locl.h" 6055714Skris 6155714Skris/* The input and output encrypted as though 64bit cfb mode is being 6255714Skris * used. The extra state information to record how much of the 6355714Skris * 64bit block we have used is contained in *num; 6455714Skris */ 6555714Skris 6655714Skrisvoid des_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, 6755714Skris long length, des_key_schedule ks1, des_key_schedule ks2, 6855714Skris des_key_schedule ks3, des_cblock *ivec, int *num, int enc) 6955714Skris { 7055714Skris register DES_LONG v0,v1; 7155714Skris register long l=length; 7255714Skris register int n= *num; 7355714Skris DES_LONG ti[2]; 7455714Skris unsigned char *iv,c,cc; 7555714Skris 7655714Skris iv=&(*ivec)[0]; 7755714Skris if (enc) 7855714Skris { 7955714Skris while (l--) 8055714Skris { 8155714Skris if (n == 0) 8255714Skris { 8355714Skris c2l(iv,v0); 8455714Skris c2l(iv,v1); 8555714Skris 8655714Skris ti[0]=v0; 8755714Skris ti[1]=v1; 8855714Skris des_encrypt3(ti,ks1,ks2,ks3); 8955714Skris v0=ti[0]; 9055714Skris v1=ti[1]; 9155714Skris 9255714Skris iv = &(*ivec)[0]; 9355714Skris l2c(v0,iv); 9455714Skris l2c(v1,iv); 9555714Skris iv = &(*ivec)[0]; 9655714Skris } 9755714Skris c= *(in++)^iv[n]; 9855714Skris *(out++)=c; 9955714Skris iv[n]=c; 10055714Skris n=(n+1)&0x07; 10155714Skris } 10255714Skris } 10355714Skris else 10455714Skris { 10555714Skris while (l--) 10655714Skris { 10755714Skris if (n == 0) 10855714Skris { 10955714Skris c2l(iv,v0); 11055714Skris c2l(iv,v1); 11155714Skris 11255714Skris ti[0]=v0; 11355714Skris ti[1]=v1; 11455714Skris des_encrypt3(ti,ks1,ks2,ks3); 11555714Skris v0=ti[0]; 11655714Skris v1=ti[1]; 11755714Skris 11855714Skris iv = &(*ivec)[0]; 11955714Skris l2c(v0,iv); 12055714Skris l2c(v1,iv); 12155714Skris iv = &(*ivec)[0]; 12255714Skris } 12355714Skris cc= *(in++); 12455714Skris c=iv[n]; 12555714Skris iv[n]=cc; 12655714Skris *(out++)=c^cc; 12755714Skris n=(n+1)&0x07; 12855714Skris } 12955714Skris } 13055714Skris v0=v1=ti[0]=ti[1]=c=cc=0; 13155714Skris *num=n; 13255714Skris } 13355714Skris 13455714Skris#ifdef undef /* MACRO */ 13555714Skrisvoid des_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length, 13655714Skris des_key_schedule ks1, des_key_schedule ks2, des_cblock (*ivec), 13755714Skris int *num, int enc) 13855714Skris { 13955714Skris des_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc); 14055714Skris } 14155714Skris#endif 142