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. 8296341Sdelphij * 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). 15296341Sdelphij * 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. 22296341Sdelphij * 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 :-). 37296341Sdelphij * 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)" 40296341Sdelphij * 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. 52296341Sdelphij * 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 66296341Sdelphij/*- 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, 81296341Sdelphij DES_key_schedule *sched, DES_cblock *iv) 82296341Sdelphij{ 83238405Sjkim#if defined(OPENSSL_NO_POSIX_IO) 84296341Sdelphij return (-1); 85238405Sjkim#else 86296341Sdelphij# ifdef _LIBC 87296341Sdelphij extern unsigned long time(); 88296341Sdelphij extern int write(); 89296341Sdelphij# endif 90296341Sdelphij const unsigned char *buf = _buf; 91296341Sdelphij long rnum; 92296341Sdelphij int i, j, k, outnum; 93296341Sdelphij static unsigned char *outbuf = NULL; 94296341Sdelphij unsigned char shortbuf[8]; 95296341Sdelphij unsigned char *p; 96296341Sdelphij const unsigned char *cp; 97296341Sdelphij static int start = 1; 9855714Skris 99296341Sdelphij if (len < 0) 100296341Sdelphij return -1; 10155714Skris 102296341Sdelphij if (outbuf == NULL) { 103296341Sdelphij outbuf = OPENSSL_malloc(BSIZE + HDRSIZE); 104296341Sdelphij if (outbuf == NULL) 105296341Sdelphij return (-1); 106296341Sdelphij } 107296341Sdelphij /* 108296341Sdelphij * If we are sending less than 8 bytes, the same char will look the same 109296341Sdelphij * if we don't pad it out with random bytes 110296341Sdelphij */ 111296341Sdelphij if (start) { 112296341Sdelphij start = 0; 113296341Sdelphij } 11455714Skris 115296341Sdelphij /* lets recurse if we want to send the data in small chunks */ 116296341Sdelphij if (len > MAXWRITE) { 117296341Sdelphij j = 0; 118296341Sdelphij for (i = 0; i < len; i += k) { 119296341Sdelphij k = DES_enc_write(fd, &(buf[i]), 120296341Sdelphij ((len - i) > MAXWRITE) ? MAXWRITE : (len - i), 121296341Sdelphij sched, iv); 122296341Sdelphij if (k < 0) 123296341Sdelphij return (k); 124296341Sdelphij else 125296341Sdelphij j += k; 126296341Sdelphij } 127296341Sdelphij return (j); 128296341Sdelphij } 12955714Skris 130296341Sdelphij /* write length first */ 131296341Sdelphij p = outbuf; 132296341Sdelphij l2n(len, p); 13355714Skris 134296341Sdelphij /* pad short strings */ 135296341Sdelphij if (len < 8) { 136296341Sdelphij cp = shortbuf; 137296341Sdelphij memcpy(shortbuf, buf, len); 138296341Sdelphij if (RAND_pseudo_bytes(shortbuf + len, 8 - len) < 0) { 139296341Sdelphij return -1; 140296341Sdelphij } 141296341Sdelphij rnum = 8; 142296341Sdelphij } else { 143296341Sdelphij cp = buf; 144296341Sdelphij rnum = ((len + 7) / 8 * 8); /* round up to nearest eight */ 145296341Sdelphij } 14655714Skris 147296341Sdelphij if (DES_rw_mode & DES_PCBC_MODE) 148296341Sdelphij DES_pcbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched, 149296341Sdelphij iv, DES_ENCRYPT); 150296341Sdelphij else 151296341Sdelphij DES_cbc_encrypt(cp, &(outbuf[HDRSIZE]), (len < 8) ? 8 : len, sched, 152296341Sdelphij iv, DES_ENCRYPT); 15355714Skris 154296341Sdelphij /* output */ 155296341Sdelphij outnum = rnum + HDRSIZE; 15655714Skris 157296341Sdelphij for (j = 0; j < outnum; j += i) { 158296341Sdelphij /* 159296341Sdelphij * eay 26/08/92 I was not doing writing from where we got up to. 160296341Sdelphij */ 161296341Sdelphij# ifndef _WIN32 162296341Sdelphij i = write(fd, (void *)&(outbuf[j]), outnum - j); 163296341Sdelphij# else 164296341Sdelphij i = _write(fd, (void *)&(outbuf[j]), outnum - j); 165296341Sdelphij# endif 166296341Sdelphij if (i == -1) { 167296341Sdelphij# ifdef EINTR 168296341Sdelphij if (errno == EINTR) 169296341Sdelphij i = 0; 170296341Sdelphij else 171296341Sdelphij# endif 172296341Sdelphij /* 173296341Sdelphij * This is really a bad error - very bad It will stuff-up 174296341Sdelphij * both ends. 175296341Sdelphij */ 176296341Sdelphij return (-1); 177296341Sdelphij } 178296341Sdelphij } 179296341Sdelphij 180296341Sdelphij return (len); 181296341Sdelphij#endif /* OPENSSL_NO_POSIX_IO */ 182296341Sdelphij} 183