165 lines
5.1 KiB
C
165 lines
5.1 KiB
C
/* crypto/des/enc_writ.c */
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/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@mincom.oz.au).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@mincom.oz.au).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@mincom.oz.au)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <time.h>
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#include <unistd.h>
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#include "des_locl.h"
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int des_enc_write(fd, buf, len, sched, iv)
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int fd;
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char *buf;
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int len;
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des_key_schedule sched;
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des_cblock (*iv);
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{
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#ifdef _LIBC
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extern int srandom();
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extern unsigned long time();
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extern int random();
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extern int write();
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#endif
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long rnum;
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int i,j,k,outnum;
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char *outbuf=NULL;
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char shortbuf[8];
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char *p;
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static int start=1;
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if (outbuf == NULL)
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{
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outbuf=(char *)malloc(BSIZE+HDRSIZE);
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if (outbuf == NULL) return(-1);
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}
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/* If we are sending less than 8 bytes, the same char will look
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* the same if we don't pad it out with random bytes */
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if (start)
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{
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start=0;
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srandom((unsigned int)time(NULL));
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}
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/* lets recurse if we want to send the data in small chunks */
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if (len > MAXWRITE)
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{
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j=0;
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for (i=0; i<len; i+=k)
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{
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k=des_enc_write(fd,&(buf[i]),
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((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv);
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if (k < 0)
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return(k);
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else
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j+=k;
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}
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return(j);
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}
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/* write length first */
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p=outbuf;
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l2n(len,p);
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/* pad short strings */
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if (len < 8)
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{
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p=shortbuf;
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memcpy(shortbuf,buf,(unsigned int)len);
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for (i=len; i<8; i++)
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shortbuf[i]=random();
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rnum=8;
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}
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else
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{
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p=buf;
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rnum=((len+7)/8*8); /* round up to nearest eight */
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}
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if (des_rw_mode & DES_PCBC_MODE)
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des_pcbc_encrypt((des_cblock *)p,
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(des_cblock *)&(outbuf[HDRSIZE]),
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(long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
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else
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des_cbc_encrypt((des_cblock *)p,
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(des_cblock *)&(outbuf[HDRSIZE]),
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(long)((len<8)?8:len),sched,iv,DES_ENCRYPT);
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/* output */
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outnum=(int)rnum+HDRSIZE;
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for (j=0; j<outnum; j+=i)
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{
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/* eay 26/08/92 I was not doing writing from where we
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* got upto. */
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i=write(fd,&(outbuf[j]),(unsigned int)(outnum-j));
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if (i == -1)
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{
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if (errno == EINTR)
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i=0;
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else /* This is really a bad error - very bad
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* It will stuff-up both ends. */
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return(-1);
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}
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}
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return(len);
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}
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