11320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci/* crypto/des/cfb64enc.c */ 21320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 31320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * All rights reserved. 41320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 51320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * This package is an SSL implementation written 61320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * by Eric Young (eay@cryptsoft.com). 71320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * The implementation was written so as to conform with Netscapes SSL. 81320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 91320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * This library is free for commercial and non-commercial use as long as 101320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * the following conditions are aheared to. The following conditions 111320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * apply to all code found in this distribution, be it the RC4, RSA, 121320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * lhash, DES, etc., code; not just the SSL code. The SSL documentation 131320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * included with this distribution is covered by the same copyright terms 141320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * except that the holder is Tim Hudson (tjh@cryptsoft.com). 151320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 161320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * Copyright remains Eric Young's, and as such any Copyright notices in 171320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * the code are not to be removed. 181320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * If this package is used in a product, Eric Young should be given attribution 191320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * as the author of the parts of the library used. 201320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * This can be in the form of a textual message at program startup or 211320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * in documentation (online or textual) provided with the package. 221320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 231320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * Redistribution and use in source and binary forms, with or without 241320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * modification, are permitted provided that the following conditions 251320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * are met: 261320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 1. Redistributions of source code must retain the copyright 271320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * notice, this list of conditions and the following disclaimer. 281320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 2. Redistributions in binary form must reproduce the above copyright 291320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * notice, this list of conditions and the following disclaimer in the 301320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * documentation and/or other materials provided with the distribution. 311320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 3. All advertising materials mentioning features or use of this software 321320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * must display the following acknowledgement: 331320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * "This product includes cryptographic software written by 341320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * Eric Young (eay@cryptsoft.com)" 351320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * The word 'cryptographic' can be left out if the rouines from the library 361320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * being used are not cryptographic related :-). 371320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 4. If you include any Windows specific code (or a derivative thereof) from 381320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * the apps directory (application code) you must include an acknowledgement: 391320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 401320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * 411320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include "des_locl.h" 60 61/* The input and output encrypted as though 64bit cfb mode is being 62 * used. The extra state information to record how much of the 63 * 64bit block we have used is contained in *num; 64 */ 65 66void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out, 67 long length, DES_key_schedule *schedule, 68 DES_cblock *ivec, int *num, int enc) 69 { 70 register DES_LONG v0,v1; 71 register long l=length; 72 register int n= *num; 73 DES_LONG ti[2]; 74 unsigned char *iv,c,cc; 75 76 iv = &(*ivec)[0]; 77 if (enc) 78 { 79 while (l--) 80 { 81 if (n == 0) 82 { 83 c2l(iv,v0); ti[0]=v0; 84 c2l(iv,v1); ti[1]=v1; 85 DES_encrypt1(ti,schedule,DES_ENCRYPT); 86 iv = &(*ivec)[0]; 87 v0=ti[0]; l2c(v0,iv); 88 v0=ti[1]; l2c(v0,iv); 89 iv = &(*ivec)[0]; 90 } 91 c= *(in++)^iv[n]; 92 *(out++)=c; 93 iv[n]=c; 94 n=(n+1)&0x07; 95 } 96 } 97 else 98 { 99 while (l--) 100 { 101 if (n == 0) 102 { 103 c2l(iv,v0); ti[0]=v0; 104 c2l(iv,v1); ti[1]=v1; 105 DES_encrypt1(ti,schedule,DES_ENCRYPT); 106 iv = &(*ivec)[0]; 107 v0=ti[0]; l2c(v0,iv); 108 v0=ti[1]; l2c(v0,iv); 109 iv = &(*ivec)[0]; 110 } 111 cc= *(in++); 112 c=iv[n]; 113 iv[n]=cc; 114 *(out++)=c^cc; 115 n=(n+1)&0x07; 116 } 117 } 118 v0=v1=ti[0]=ti[1]=c=cc=0; 119 *num=n; 120 } 121 122