pcbc_enc.c revision 109998
11556Srgrimes/* crypto/des/pcbc_enc.c */ 21556Srgrimes/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 31556Srgrimes * All rights reserved. 41556Srgrimes * 51556Srgrimes * This package is an SSL implementation written 61556Srgrimes * by Eric Young (eay@cryptsoft.com). 71556Srgrimes * The implementation was written so as to conform with Netscapes SSL. 81556Srgrimes * 91556Srgrimes * This library is free for commercial and non-commercial use as long as 101556Srgrimes * the following conditions are aheared to. The following conditions 111556Srgrimes * apply to all code found in this distribution, be it the RC4, RSA, 121556Srgrimes * lhash, DES, etc., code; not just the SSL code. The SSL documentation 131556Srgrimes * included with this distribution is covered by the same copyright terms 141556Srgrimes * except that the holder is Tim Hudson (tjh@cryptsoft.com). 151556Srgrimes * 161556Srgrimes * Copyright remains Eric Young's, and as such any Copyright notices in 171556Srgrimes * the code are not to be removed. 181556Srgrimes * If this package is used in a product, Eric Young should be given attribution 191556Srgrimes * as the author of the parts of the library used. 201556Srgrimes * This can be in the form of a textual message at program startup or 211556Srgrimes * in documentation (online or textual) provided with the package. 221556Srgrimes * 231556Srgrimes * Redistribution and use in source and binary forms, with or without 241556Srgrimes * modification, are permitted provided that the following conditions 251556Srgrimes * are met: 261556Srgrimes * 1. Redistributions of source code must retain the copyright 271556Srgrimes * notice, this list of conditions and the following disclaimer. 281556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 291556Srgrimes * notice, this list of conditions and the following disclaimer in the 3050471Speter * documentation and/or other materials provided with the distribution. 311556Srgrimes * 3. All advertising materials mentioning features or use of this software 321556Srgrimes * must display the following acknowledgement: 331556Srgrimes * "This product includes cryptographic software written by 3491146Sbde * Eric Young (eay@cryptsoft.com)" 3591146Sbde * The word 'cryptographic' can be left out if the rouines from the library 3691146Sbde * being used are not cryptographic related :-). 371556Srgrimes * 4. If you include any Windows specific code (or a derivative thereof) from 381556Srgrimes * the apps directory (application code) you must include an acknowledgement: 391556Srgrimes * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40161586Sjulian * 41113218Smdodd * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 421556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 431556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4490107Simp * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45105395Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46105395Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4790107Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4890107Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49149790Scsjp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50149790Scsjp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5190107Simp * SUCH DAMAGE. 521556Srgrimes * 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 61void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output, 62 long length, DES_key_schedule *schedule, 63 DES_cblock *ivec, int enc) 64 { 65 register DES_LONG sin0,sin1,xor0,xor1,tout0,tout1; 66 DES_LONG tin[2]; 67 const unsigned char *in; 68 unsigned char *out,*iv; 69 70 in=input; 71 out=output; 72 iv = &(*ivec)[0]; 73 74 if (enc) 75 { 76 c2l(iv,xor0); 77 c2l(iv,xor1); 78 for (; length>0; length-=8) 79 { 80 if (length >= 8) 81 { 82 c2l(in,sin0); 83 c2l(in,sin1); 84 } 85 else 86 c2ln(in,sin0,sin1,length); 87 tin[0]=sin0^xor0; 88 tin[1]=sin1^xor1; 89 DES_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT); 90 tout0=tin[0]; 91 tout1=tin[1]; 92 xor0=sin0^tout0; 93 xor1=sin1^tout1; 94 l2c(tout0,out); 95 l2c(tout1,out); 96 } 97 } 98 else 99 { 100 c2l(iv,xor0); c2l(iv,xor1); 101 for (; length>0; length-=8) 102 { 103 c2l(in,sin0); 104 c2l(in,sin1); 105 tin[0]=sin0; 106 tin[1]=sin1; 107 DES_encrypt1((DES_LONG *)tin,schedule,DES_DECRYPT); 108 tout0=tin[0]^xor0; 109 tout1=tin[1]^xor1; 110 if (length >= 8) 111 { 112 l2c(tout0,out); 113 l2c(tout1,out); 114 } 115 else 116 l2cn(tout0,tout1,out,length); 117 xor0=tout0^sin0; 118 xor1=tout1^sin1; 119 } 120 } 121 tin[0]=tin[1]=0; 122 sin0=sin1=xor0=xor1=tout0=tout1=0; 123 } 124