/* crypto/rc4/rc4.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.]

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <openssl/rc4.h>

#include <openssl/evp.h>

char *usage[]={

"usage: rc4 args\n",

"\n",

" -in arg         - input file - default stdin\n",

" -out arg        - output file - default stdout\n",

" -key key        - password\n",

NULL

};

int main(int argc, char *argv[])

	{

	FILE *in=NULL,*out=NULL;

	char *infile=NULL,*outfile=NULL,*keystr=NULL;

	RC4_KEY key;

	char buf[BUFSIZ];

	int badops=0,i;

	char **pp;

	unsigned char md[MD5_DIGEST_LENGTH];

	argc--;

	argv++;

	while (argc >= 1)

		{

		if 	(strcmp(*argv,"-in") == 0)

			{

			if (--argc < 1) goto bad;

			infile= *(++argv);

			}

		else if (strcmp(*argv,"-out") == 0)

			{

			if (--argc < 1) goto bad;

			outfile= *(++argv);

			}

		else if (strcmp(*argv,"-key") == 0)

			{

			if (--argc < 1) goto bad;

			keystr= *(++argv);

			}

		else

			{

			fprintf(stderr,"unknown option %s\n",*argv);

			badops=1;

			break;

			}

		argc--;

		argv++;

		}

	if (badops)

		{

bad:

		for (pp=usage; (*pp != NULL); pp++)

			fprintf(stderr,"%s",*pp);

		exit(1);

		}

	if (infile == NULL)

		in=stdin;

	else

		{

		in=fopen(infile,"r");

		if (in == NULL)

			{

			perror("open");

			exit(1);

			}

		}

	if (outfile == NULL)

		out=stdout;

	else

		{

		out=fopen(outfile,"w");

		if (out == NULL)

			{

			perror("open");

			exit(1);

			}

		}

#ifdef OPENSSL_SYS_MSDOS

	/* This should set the file to binary mode. */

	{

#include <fcntl.h>

	setmode(fileno(in),O_BINARY);

	setmode(fileno(out),O_BINARY);

	}

#endif

	if (keystr == NULL)

		{ /* get key */

		i=EVP_read_pw_string(buf,BUFSIZ,"Enter RC4 password:",0);

		if (i != 0)

			{

			OPENSSL_cleanse(buf,BUFSIZ);

			fprintf(stderr,"bad password read\n");

			exit(1);

			}

		keystr=buf;

		}

	EVP_Digest((unsigned char *)keystr,strlen(keystr),md,NULL,EVP_md5(),NULL);

	OPENSSL_cleanse(keystr,strlen(keystr));

	RC4_set_key(&key,MD5_DIGEST_LENGTH,md);

	for(;;)

		{

		i=fread(buf,1,BUFSIZ,in);

		if (i == 0) break;

		if (i < 0)

			{

			perror("read");

			exit(1);

			}

		RC4(&key,(unsigned int)i,(unsigned char *)buf,

			(unsigned char *)buf);

		i=fwrite(buf,(unsigned int)i,1,out);

		if (i != 1)

			{

			perror("write");

			exit(1);

			}

		}

	fclose(out);

	fclose(in);

	exit(0);

	return(1);

	}