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