/* 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);

 	}