/* crypto/des/enc_writ.c */

/* 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.]

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <errno.h>

#include <time.h>

#include <stdio.h>

#include "cryptlib.h"

#include "des_locl.h"

#include <openssl/rand.h>

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

/*

 * 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.

 */

#ifdef EMULATOR

GET_STATIC_VAR_FROM_TLS(outbuf,enc_write,unsigned char *)

#define outbuf (*GET_WSD_VAR_NAME(outbuf,enc_write, s)())

GET_STATIC_VAR_FROM_TLS(start,enc_write,int)

#define start (*GET_WSD_VAR_NAME(start,enc_write, s)())

#define DES_rw_mode libcrypto_ImpurePtr()->_shadow_DES_rw_mode

#endif

EXPORT_C 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

#ifndef EMULATOR

	const unsigned char *buf=_buf;

#else

const unsigned char *const buf=_buf;	

#endif	

	long rnum;

	int i,j,k,outnum;

#ifndef EMULATOR	

	static unsigned char *outbuf=NULL;

#endif	

	unsigned char shortbuf[8];

	unsigned char *p;

	const unsigned char *cp;

#ifndef EMULATOR	

	static int start=1;

#endif	

	if (outbuf == NULL)

		{

		outbuf=OPENSSL_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);

		RAND_pseudo_bytes(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);

	}