/* $OpenBSD: enc_writ.c,v 1.15 2022/11/26 16:08:51 tb Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <time.h> #include <openssl/opensslconf.h> #include "des_local.h" /* * WARNINGS: * * - The data format used by DES_enc_write() and DES_enc_read() * has a cryptographic weakness: When asked to write more * than MAXWRITE bytes, DES_enc_write will split the data * into several chunks that are all encrypted * using the same IV. So don't use these functions unless you * are sure you know what you do (in which case you might * not want to use them anyway). * * - This code cannot handle non-blocking sockets. */ int DES_enc_write(int fd, const void *_buf, int len, DES_key_schedule *sched, DES_cblock *iv) { #ifdef _LIBC extern unsigned long time(); extern int write(); #endif const unsigned char *buf=_buf; long rnum; int i,j,k,outnum; static unsigned char *outbuf=NULL; unsigned char shortbuf[8]; unsigned char *p; const unsigned char *cp; static int start=1; if (outbuf == NULL) { outbuf=malloc(BSIZE+HDRSIZE); if (outbuf == NULL) return(-1); } /* If we are sending less than 8 bytes, the same char will look * the same if we don't pad it out with random bytes */ if (start) { start=0; } /* lets recurse if we want to send the data in small chunks */ if (len > MAXWRITE) { j=0; for (i=0; i<len; i+=k) { k=DES_enc_write(fd,&(buf[i]), ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv); if (k < 0) return(k); else j+=k; } return(j); } /* write length first */ p=outbuf; l2n(len,p); /* pad short strings */ if (len < 8) { cp=shortbuf; memcpy(shortbuf,buf,len); arc4random_buf(shortbuf+len, 8-len); rnum=8; } else { cp=buf; rnum=((len+7)/8*8); /* round up to nearest eight */ } if (DES_rw_mode & DES_PCBC_MODE) DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, DES_ENCRYPT); else DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv, DES_ENCRYPT); /* output */ outnum=rnum+HDRSIZE; for (j=0; j<outnum; j+=i) { /* eay 26/08/92 I was not doing writing from where we * got up to. */ i=write(fd,(void *)&(outbuf[j]),outnum-j); if (i == -1) { #ifdef EINTR if (errno == EINTR) i=0; else #endif /* This is really a bad error - very bad * It will stuff-up both ends. */ return(-1); } } return(len); }