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/* lib/des/enc_writ.c */
/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
* All rights reserved.
*
* This file is part of an SSL implementation written
* by Eric Young (eay@mincom.oz.au).
* The implementation was written so as to conform with Netscapes SSL
* specification. This library and applications are
* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
* as long as the following conditions are aheared to.
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed. If this code is used in a product,
* Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@mincom.oz.au)
*
* 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 <time.h>
#include "des_locl.h"
int des_enc_write(fd, buf, len, sched, iv)
int fd;
char *buf;
int len;
des_key_schedule sched;
des_cblock (*iv);
{
#ifdef _LIBC
extern int srandom();
extern unsigned long time();
extern int random();
extern int write();
#endif
long rnum;
int i,j,k,outnum;
char outbuf[BSIZE+HDRSIZE];
char shortbuf[8];
char *p;
static int start=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;
srandom((unsigned int)time(NULL));
}
/* 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)
{
p=shortbuf;
memcpy(shortbuf,buf,(unsigned int)len);
for (i=len; i<8; i++)
shortbuf[i]=random();
rnum=8;
}
else
{
p=buf;
rnum=((len+7)/8*8); /* round up to nearest eight */
}
if (des_rw_mode & DES_PCBC_MODE)
pcbc_encrypt((des_cblock *)p,(des_cblock *)&(outbuf[HDRSIZE]),
(long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
else
cbc_encrypt((des_cblock *)p,(des_cblock *)&(outbuf[HDRSIZE]),
(long)((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 upto. */
i=write(fd,&(outbuf[j]),(unsigned int)(outnum-j));
if (i == -1)
{
if (errno == EINTR)
i=0;
else /* This is really a bad error - very bad
* It will stuff-up both ends. */
return(-1);
}
}
return(len);
}
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