150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
/* crypto/des/enc_writ.c */
|
|
/* Copyright (C) 1995-1996 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=NULL;
|
|
char shortbuf[8];
|
|
char *p;
|
|
static int start=1;
|
|
|
|
if (outbuf == NULL)
|
|
{
|
|
outbuf=(char *)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;
|
|
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)
|
|
des_pcbc_encrypt((des_cblock *)p,
|
|
(des_cblock *)&(outbuf[HDRSIZE]),
|
|
(long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
|
|
else
|
|
des_cbc_encrypt((des_cblock *)p,
|
|
(des_cblock *)&(outbuf[HDRSIZE]),
|
|
(long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
|
|
|
|
/* output */
|
|
outnum=(int)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);
|
|
}
|