/* 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);

 	}