155714Skris/* crypto/des/enc_writ.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <errno.h> 6055714Skris#include <time.h> 6155714Skris#include <stdio.h> 6255714Skris#include "cryptlib.h" 6355714Skris#include "des_locl.h" 6455714Skris#include <openssl/rand.h> 6555714Skris 6655714Skris/* 6755714Skris * WARNINGS: 6855714Skris * 69109998Smarkm * - The data format used by DES_enc_write() and DES_enc_read() 7055714Skris * has a cryptographic weakness: When asked to write more 71109998Smarkm * than MAXWRITE bytes, DES_enc_write will split the data 7255714Skris * into several chunks that are all encrypted 7355714Skris * using the same IV. So don't use these functions unless you 7455714Skris * are sure you know what you do (in which case you might 7555714Skris * not want to use them anyway). 7655714Skris * 7755714Skris * - This code cannot handle non-blocking sockets. 7855714Skris */ 7955714Skris 80109998Smarkmint DES_enc_write(int fd, const void *_buf, int len, 81109998Smarkm DES_key_schedule *sched, DES_cblock *iv) 8255714Skris { 83238405Sjkim#if defined(OPENSSL_NO_POSIX_IO) 84238405Sjkim return (-1); 85238405Sjkim#else 8655714Skris#ifdef _LIBC 8755714Skris extern unsigned long time(); 8855714Skris extern int write(); 8955714Skris#endif 9055714Skris const unsigned char *buf=_buf; 9155714Skris long rnum; 9255714Skris int i,j,k,outnum; 9355714Skris static unsigned char *outbuf=NULL; 9455714Skris unsigned char shortbuf[8]; 9555714Skris unsigned char *p; 9655714Skris const unsigned char *cp; 9755714Skris static int start=1; 9855714Skris 9955714Skris if (outbuf == NULL) 10055714Skris { 10168651Skris outbuf=OPENSSL_malloc(BSIZE+HDRSIZE); 10255714Skris if (outbuf == NULL) return(-1); 10355714Skris } 10455714Skris /* If we are sending less than 8 bytes, the same char will look 10555714Skris * the same if we don't pad it out with random bytes */ 10655714Skris if (start) 10755714Skris { 10855714Skris start=0; 10955714Skris } 11055714Skris 11155714Skris /* lets recurse if we want to send the data in small chunks */ 11255714Skris if (len > MAXWRITE) 11355714Skris { 11455714Skris j=0; 11555714Skris for (i=0; i<len; i+=k) 11655714Skris { 117109998Smarkm k=DES_enc_write(fd,&(buf[i]), 11855714Skris ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv); 11955714Skris if (k < 0) 12055714Skris return(k); 12155714Skris else 12255714Skris j+=k; 12355714Skris } 12455714Skris return(j); 12555714Skris } 12655714Skris 12755714Skris /* write length first */ 12855714Skris p=outbuf; 12955714Skris l2n(len,p); 13055714Skris 13155714Skris /* pad short strings */ 13255714Skris if (len < 8) 13355714Skris { 13455714Skris cp=shortbuf; 13555714Skris memcpy(shortbuf,buf,len); 13659191Skris RAND_pseudo_bytes(shortbuf+len, 8-len); 13755714Skris rnum=8; 13855714Skris } 13955714Skris else 14055714Skris { 14159191Skris cp=buf; 14255714Skris rnum=((len+7)/8*8); /* round up to nearest eight */ 14355714Skris } 14455714Skris 145109998Smarkm if (DES_rw_mode & DES_PCBC_MODE) 146109998Smarkm DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, 14755714Skris DES_ENCRYPT); 14855714Skris else 149109998Smarkm DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, 15055714Skris DES_ENCRYPT); 15155714Skris 15255714Skris /* output */ 15355714Skris outnum=rnum+HDRSIZE; 15455714Skris 15555714Skris for (j=0; j<outnum; j+=i) 15655714Skris { 15755714Skris /* eay 26/08/92 I was not doing writing from where we 15859191Skris * got up to. */ 159194206Ssimon#ifndef _WIN32 16059191Skris i=write(fd,(void *)&(outbuf[j]),outnum-j); 161194206Ssimon#else 162194206Ssimon i=_write(fd,(void *)&(outbuf[j]),outnum-j); 163194206Ssimon#endif 16455714Skris if (i == -1) 16555714Skris { 16659191Skris#ifdef EINTR 16755714Skris if (errno == EINTR) 16855714Skris i=0; 16959191Skris else 17059191Skris#endif 17159191Skris /* This is really a bad error - very bad 17255714Skris * It will stuff-up both ends. */ 17355714Skris return(-1); 17455714Skris } 17555714Skris } 17655714Skris 17755714Skris return(len); 178238405Sjkim#endif /* OPENSSL_NO_POSIX_IO */ 17955714Skris } 180