cbc3_enc.c revision 59191
1341825Sdim/* crypto/des/cbc3_enc.c */ 2218887Sdim/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3353358Sdim * All rights reserved. 4353358Sdim * 5353358Sdim * This package is an SSL implementation written 6218887Sdim * by Eric Young (eay@cryptsoft.com). 7218887Sdim * The implementation was written so as to conform with Netscapes SSL. 8218887Sdim * 9218887Sdim * This library is free for commercial and non-commercial use as long as 10218887Sdim * the following conditions are aheared to. The following conditions 11218887Sdim * apply to all code found in this distribution, be it the RC4, RSA, 12218887Sdim * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13218887Sdim * included with this distribution is covered by the same copyright terms 14280031Sdim * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280031Sdim * 16218887Sdim * Copyright remains Eric Young's, and as such any Copyright notices in 17218887Sdim * the code are not to be removed. 18341825Sdim * If this package is used in a product, Eric Young should be given attribution 19327952Sdim * as the author of the parts of the library used. 20226633Sdim * This can be in the form of a textual message at program startup or 21309124Sdim * in documentation (online or textual) provided with the package. 22226633Sdim * 23309124Sdim * Redistribution and use in source and binary forms, with or without 24249423Sdim * modification, are permitted provided that the following conditions 25249423Sdim * are met: 26249423Sdim * 1. Redistributions of source code must retain the copyright 27276479Sdim * notice, this list of conditions and the following disclaimer. 28341825Sdim * 2. Redistributions in binary form must reproduce the above copyright 29218887Sdim * notice, this list of conditions and the following disclaimer in the 30218887Sdim * documentation and/or other materials provided with the distribution. 31218887Sdim * 3. All advertising materials mentioning features or use of this software 32341825Sdim * must display the following acknowledgement: 33341825Sdim * "This product includes cryptographic software written by 34341825Sdim * Eric Young (eay@cryptsoft.com)" 35218887Sdim * The word 'cryptographic' can be left out if the rouines from the library 36218887Sdim * being used are not cryptographic related :-). 37341825Sdim * 4. If you include any Windows specific code (or a derivative thereof) from 38341825Sdim * the apps directory (application code) you must include an acknowledgement: 39341825Sdim * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40341825Sdim * 41218887Sdim * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42226633Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43218887Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44218887Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45226633Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46321369Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47321369Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48321369Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49321369Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50218887Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51226633Sdim * SUCH DAMAGE. 52218887Sdim * 53226633Sdim * The licence and distribution terms for any publically available version or 54296417Sdim * derivative of this code cannot be changed. i.e. this code cannot simply be 55218887Sdim * copied and put under another distribution licence 56218887Sdim * [including the GNU Public Licence.] 57218887Sdim */ 58276479Sdim 59218887Sdim#include "des_locl.h" 60218887Sdim 61218887Sdim/* HAS BUGS! DON'T USE - this is only present for use in des.c */ 62276479Sdimvoid des_3cbc_encrypt(des_cblock *input, des_cblock *output, long length, 63309124Sdim des_key_schedule ks1, des_key_schedule ks2, des_cblock *iv1, 64218887Sdim des_cblock *iv2, int enc) 65276479Sdim { 66218887Sdim int off=((int)length-1)/8; 67218887Sdim long l8=((length+7)/8)*8; 68341825Sdim des_cblock niv1,niv2; 69296417Sdim 70218887Sdim if (enc == DES_ENCRYPT) 71218887Sdim { 72218887Sdim des_cbc_encrypt((unsigned char*)input, 73234353Sdim (unsigned char*)output,length,ks1,iv1,enc); 74234353Sdim if (length >= sizeof(des_cblock)) 75218887Sdim memcpy(niv1,output[off],sizeof(des_cblock)); 76226633Sdim des_cbc_encrypt((unsigned char*)output, 77218887Sdim (unsigned char*)output,l8,ks2,iv1,!enc); 78218887Sdim des_cbc_encrypt((unsigned char*)output, 79234353Sdim (unsigned char*)output,l8,ks1,iv2,enc); 80226633Sdim if (length >= sizeof(des_cblock)) 81218887Sdim memcpy(niv2,output[off],sizeof(des_cblock)); 82218887Sdim } 83234353Sdim else 84296417Sdim { 85296417Sdim if (length >= sizeof(des_cblock)) 86321369Sdim memcpy(niv2,input[off],sizeof(des_cblock)); 87321369Sdim des_cbc_encrypt((unsigned char*)input, 88321369Sdim (unsigned char*)output,l8,ks1,iv2,enc); 89321369Sdim des_cbc_encrypt((unsigned char*)output, 90321369Sdim (unsigned char*)output,l8,ks2,iv1,!enc); 91321369Sdim if (length >= sizeof(des_cblock)) 92321369Sdim memcpy(niv1,output[off],sizeof(des_cblock)); 93321369Sdim des_cbc_encrypt((unsigned char*)output, 94321369Sdim (unsigned char*)output,length,ks1,iv1,enc); 95218887Sdim } 96226633Sdim memcpy(*iv1,niv1,sizeof(des_cblock)); 97218887Sdim memcpy(*iv2,niv2,sizeof(des_cblock)); 98226633Sdim } 99218887Sdim 100276479Sdim