1656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* crypto/des/cfb_enc.c */ 2656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * All rights reserved. 4656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 5656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This package is an SSL implementation written 6656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * by Eric Young (eay@cryptsoft.com). 7656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The implementation was written so as to conform with Netscapes SSL. 8656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 9656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This library is free for commercial and non-commercial use as long as 10656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the following conditions are aheared to. The following conditions 11656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * apply to all code found in this distribution, be it the RC4, RSA, 12656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * included with this distribution is covered by the same copyright terms 14656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 16656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright remains Eric Young's, and as such any Copyright notices in 17656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the code are not to be removed. 18656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * If this package is used in a product, Eric Young should be given attribution 19656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * as the author of the parts of the library used. 20656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This can be in the form of a textual message at program startup or 21656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * in documentation (online or textual) provided with the package. 22656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 23656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Redistribution and use in source and binary forms, with or without 24656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * modification, are permitted provided that the following conditions 25656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * are met: 26656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 1. Redistributions of source code must retain the copyright 27656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer. 28656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 29656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer in the 30656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * documentation and/or other materials provided with the distribution. 31656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 3. All advertising materials mentioning features or use of this software 32656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * must display the following acknowledgement: 33656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes cryptographic software written by 34656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Eric Young (eay@cryptsoft.com)" 35656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The word 'cryptographic' can be left out if the rouines from the library 36656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * being used are not cryptographic related :-). 37656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 4. If you include any Windows specific code (or a derivative thereof) from 38656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the apps directory (application code) you must include an acknowledgement: 39656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 41656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SUCH DAMAGE. 52656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 53656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The licence and distribution terms for any publically available version or 54656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * derivative of this code cannot be changed. i.e. this code cannot simply be 55656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * copied and put under another distribution licence 56656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * [including the GNU Public Licence.] 57656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 58656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 59656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "e_os.h" 60656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "des_locl.h" 61656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <assert.h> 62656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 63656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* The input and output are loaded in multiples of 8 bits. 64656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * What this means is that if you hame numbits=12 and length=2 65656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the first 12 bits will be retrieved from the first byte and half 66656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the second. The second 12 bits will come from the 3rd and half the 4th 67656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * byte. 68656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 69656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* Until Aug 1 2003 this function did not correctly implement CFB-r, so it 70656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * will not be compatible with any encryption prior to that date. Ben. */ 71656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectvoid DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits, 72656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project long length, DES_key_schedule *schedule, DES_cblock *ivec, 73656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int enc) 74656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 75656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project register DES_LONG d0,d1,v0,v1; 76656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project register unsigned long l=length; 77656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project register int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8; 78656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project DES_LONG ti[2]; 79656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned char *iv; 80656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifndef L_ENDIAN 81656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned char ovec[16]; 82656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 83656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned int sh[4]; 84656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned char *ovec=(unsigned char *)sh; 85656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 86656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* I kind of count that compiler optimizes away this assertioni,*/ 87656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project assert (sizeof(sh[0])==4); /* as this holds true for all, */ 88656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* but 16-bit platforms... */ 89656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 90656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 91656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 92656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (numbits<=0 || numbits > 64) return; 93656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project iv = &(*ivec)[0]; 94656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2l(iv,v0); 95656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2l(iv,v1); 96656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (enc) 97656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 98656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project while (l >= (unsigned long)n) 99656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 100656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l-=n; 101656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ti[0]=v0; 102656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ti[1]=v1; 103656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); 104656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2ln(in,d0,d1,n); 105656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project in+=n; 106656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project d0^=ti[0]; 107656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project d1^=ti[1]; 108656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2cn(d0,d1,out,n); 109656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project out+=n; 110656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* 30-08-94 - eay - changed because l>>32 and 111656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * l<<32 are bad under gcc :-( */ 112656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (numbits == 32) 113656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { v0=v1; v1=d0; } 114656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else if (numbits == 64) 115656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { v0=d0; v1=d1; } 116656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 117656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 118656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifndef L_ENDIAN 119656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project iv=&ovec[0]; 120656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(v0,iv); 121656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(v1,iv); 122656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(d0,iv); 123656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(d1,iv); 124656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 125656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1; 126656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 127656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (rem==0) 128656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memmove(ovec,ovec+num,8); 129656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 130656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project for(i=0 ; i < 8 ; ++i) 131656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ovec[i]=ovec[i+num]<<rem | 132656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ovec[i+num+1]>>(8-rem); 133656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifdef L_ENDIAN 134656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project v0=sh[0], v1=sh[1]; 135656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 136656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project iv=&ovec[0]; 137656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2l(iv,v0); 138656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2l(iv,v1); 139656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 140656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 141656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 142656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 143656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 144656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 145656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project while (l >= (unsigned long)n) 146656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 147656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l-=n; 148656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ti[0]=v0; 149656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ti[1]=v1; 150656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); 151656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2ln(in,d0,d1,n); 152656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project in+=n; 153656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* 30-08-94 - eay - changed because l>>32 and 154656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * l<<32 are bad under gcc :-( */ 155656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (numbits == 32) 156656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { v0=v1; v1=d0; } 157656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else if (numbits == 64) 158656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { v0=d0; v1=d1; } 159656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 160656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 161656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifndef L_ENDIAN 162656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project iv=&ovec[0]; 163656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(v0,iv); 164656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(v1,iv); 165656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(d0,iv); 166656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(d1,iv); 167656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 168656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1; 169656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 170656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (rem==0) 171656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project memmove(ovec,ovec+num,8); 172656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 173656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project for(i=0 ; i < 8 ; ++i) 174656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ovec[i]=ovec[i+num]<<rem | 175656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ovec[i+num+1]>>(8-rem); 176656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifdef L_ENDIAN 177656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project v0=sh[0], v1=sh[1]; 178656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 179656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project iv=&ovec[0]; 180656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2l(iv,v0); 181656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project c2l(iv,v1); 182656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 183656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 184656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project d0^=ti[0]; 185656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project d1^=ti[1]; 186656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2cn(d0,d1,out,n); 187656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project out+=n; 188656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 189656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 190656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project iv = &(*ivec)[0]; 191656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(v0,iv); 192656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project l2c(v1,iv); 193656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project v0=v1=d0=d1=ti[0]=ti[1]=0; 194656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 195656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 196