1c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org/* crypto/des/cfb64enc.c */ 2c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * All rights reserved. 4c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 5c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * This package is an SSL implementation written 6c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * by Eric Young (eay@cryptsoft.com). 7c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * The implementation was written so as to conform with Netscapes SSL. 8c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 9c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * This library is free for commercial and non-commercial use as long as 10c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * the following conditions are aheared to. The following conditions 11c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * apply to all code found in this distribution, be it the RC4, RSA, 12c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * included with this distribution is covered by the same copyright terms 14c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 16c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * Copyright remains Eric Young's, and as such any Copyright notices in 17c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * the code are not to be removed. 18c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * If this package is used in a product, Eric Young should be given attribution 19c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * as the author of the parts of the library used. 20c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * This can be in the form of a textual message at program startup or 21c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * in documentation (online or textual) provided with the package. 22c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 23c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * Redistribution and use in source and binary forms, with or without 24c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * modification, are permitted provided that the following conditions 25c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * are met: 26c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 1. Redistributions of source code must retain the copyright 27c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * notice, this list of conditions and the following disclaimer. 28c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 2. Redistributions in binary form must reproduce the above copyright 29c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * notice, this list of conditions and the following disclaimer in the 30c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * documentation and/or other materials provided with the distribution. 31c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 3. All advertising materials mentioning features or use of this software 32c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * must display the following acknowledgement: 33c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * "This product includes cryptographic software written by 34c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * Eric Young (eay@cryptsoft.com)" 35c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * The word 'cryptographic' can be left out if the rouines from the library 36c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * being used are not cryptographic related :-). 37c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 4. If you include any Windows specific code (or a derivative thereof) from 38c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * the apps directory (application code) you must include an acknowledgement: 39c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 41c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * SUCH DAMAGE. 52c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 53c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * The licence and distribution terms for any publically available version or 54c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * derivative of this code cannot be changed. i.e. this code cannot simply be 55c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * copied and put under another distribution licence 56c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * [including the GNU Public Licence.] 57c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org */ 58c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org 59c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org#include "des_locl.h" 60c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org 61c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org/* The input and output encrypted as though 64bit cfb mode is being 62c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * used. The extra state information to record how much of the 63c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org * 64bit block we have used is contained in *num; 64c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org */ 65c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org 66c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.orgvoid DES_cfb64_encrypt(const unsigned char *in, unsigned char *out, 67c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org long length, DES_key_schedule *schedule, 68c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org DES_cblock *ivec, int *num, int enc) 69c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org { 70c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org register DES_LONG v0,v1; 71c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org register long l=length; 72c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org register int n= *num; 73c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org DES_LONG ti[2]; 74c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org unsigned char *iv,c,cc; 75c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org 76c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org iv = &(*ivec)[0]; 77c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org if (enc) 78c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org { 79c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org while (l--) 80c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org { 81c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org if (n == 0) 82c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org { 83c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org c2l(iv,v0); ti[0]=v0; 84c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org c2l(iv,v1); ti[1]=v1; 85c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org DES_encrypt1(ti,schedule,DES_ENCRYPT); 86c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org iv = &(*ivec)[0]; 87c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org v0=ti[0]; l2c(v0,iv); 88c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org v0=ti[1]; l2c(v0,iv); 89c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org iv = &(*ivec)[0]; 90c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org } 91c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org c= *(in++)^iv[n]; 92c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org *(out++)=c; 93c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org iv[n]=c; 94c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org n=(n+1)&0x07; 95c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org } 96c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org } 97c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org else 98c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org { 99c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org while (l--) 100c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org { 101c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org if (n == 0) 102c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org { 103c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org c2l(iv,v0); ti[0]=v0; 104c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org c2l(iv,v1); ti[1]=v1; 105c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org DES_encrypt1(ti,schedule,DES_ENCRYPT); 106c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org iv = &(*ivec)[0]; 107c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org v0=ti[0]; l2c(v0,iv); 108c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org v0=ti[1]; l2c(v0,iv); 109c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org iv = &(*ivec)[0]; 110c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org } 111c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org cc= *(in++); 112c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org c=iv[n]; 113c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org iv[n]=cc; 114c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org *(out++)=c^cc; 115c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org n=(n+1)&0x07; 116c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org } 117c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org } 118c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org v0=v1=ti[0]=ti[1]=c=cc=0; 119c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org *num=n; 120c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org } 121c9490d33b98b7affb729b5f1db13cb0a348471aagl@chromium.org 122