/* crypto/des/des.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/opensslconf.h>

#ifndef OPENSSL_SYS_MSDOS

#ifndef OPENSSL_SYS_VMS

#include OPENSSL_UNISTD

#else /* OPENSSL_SYS_VMS */

#ifdef __DECC

#include <unistd.h>

#else /* not __DECC */

#include <math.h>

#endif /* __DECC */

#endif /* OPENSSL_SYS_VMS */

#else /* OPENSSL_SYS_MSDOS */

#include <io.h>

#endif

#include <time.h>

#include "des_ver.h"

#ifdef OPENSSL_SYS_VMS

#include <types.h>

#include <stat.h>

#else

#ifndef _IRIX

#include <sys/types.h>

#endif

#include <sys/stat.h>

#endif

#include <openssl/des.h>

#include <openssl/rand.h>

#include <openssl/ui_compat.h>

void usage(void);

void doencryption(void);

int uufwrite(unsigned char *data, int size, unsigned int num, FILE *fp);

void uufwriteEnd(FILE *fp);

int uufread(unsigned char *out,int size,unsigned int num,FILE *fp);

int uuencode(unsigned char *in,int num,unsigned char *out);

int uudecode(unsigned char *in,int num,unsigned char *out);

void DES_3cbc_encrypt(DES_cblock *input,DES_cblock *output,long length,

	DES_key_schedule sk1,DES_key_schedule sk2,

	DES_cblock *ivec1,DES_cblock *ivec2,int enc);

#ifdef OPENSSL_SYS_VMS

#define EXIT(a) exit(a&0x10000000L)

#else

#define EXIT(a) exit(a)

#endif

#define BUFSIZE (8*1024)

#define VERIFY  1

#define KEYSIZ	8

#define KEYSIZB 1024 /* should hit tty line limit first :-) */

char key[KEYSIZB+1];

int do_encrypt,longk=0;

FILE *DES_IN,*DES_OUT,*CKSUM_OUT;

char uuname[200];

unsigned char uubuf[50];

int uubufnum=0;

#define INUUBUFN	(45*100)

#define OUTUUBUF	(65*100)

unsigned char b[OUTUUBUF];

unsigned char bb[300];

DES_cblock cksum={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

char cksumname[200]="";

int vflag,cflag,eflag,dflag,kflag,bflag,fflag,sflag,uflag,flag3,hflag,error;

int main(int argc, char **argv)

	{

	int i;

	struct stat ins,outs;

	char *p;

	char *in=NULL,*out=NULL;

	vflag=cflag=eflag=dflag=kflag=hflag=bflag=fflag=sflag=uflag=flag3=0;

	error=0;

	memset(key,0,sizeof(key));

	for (i=1; i<argc; i++)

		{

		p=argv[i];

		if ((p[0] == '-') && (p[1] != '\0'))

			{

			p++;

			while (*p)

				{

				switch (*(p++))

					{

				case '3':

					flag3=1;

					longk=1;

					break;

				case 'c':

					cflag=1;

					strncpy(cksumname,p,200);

					cksumname[sizeof(cksumname)-1]='\0';

					p+=strlen(cksumname);

					break;

				case 'C':

					cflag=1;

					longk=1;

					strncpy(cksumname,p,200);

					cksumname[sizeof(cksumname)-1]='\0';

					p+=strlen(cksumname);

					break;

				case 'e':

					eflag=1;

					break;

				case 'v':

					vflag=1;

					break;

				case 'E':

					eflag=1;

					longk=1;

					break;

				case 'd':

					dflag=1;

					break;

				case 'D':

					dflag=1;

					longk=1;

					break;

				case 'b':

					bflag=1;

					break;

				case 'f':

					fflag=1;

					break;

				case 's':

					sflag=1;

					break;

				case 'u':

					uflag=1;

					strncpy(uuname,p,200);

					uuname[sizeof(uuname)-1]='\0';

					p+=strlen(uuname);

					break;

				case 'h':

					hflag=1;

					break;

				case 'k':

					kflag=1;

					if ((i+1) == argc)

						{

						fputs("must have a key with the -k option\n",stderr);

						error=1;

						}

					else

						{

						int j;

						i++;

						strncpy(key,argv[i],KEYSIZB);

						for (j=strlen(argv[i])-1; j>=0; j--)

							argv[i][j]='\0';

						}

					break;

				default:

					fprintf(stderr,"'%c' unknown flag\n",p[-1]);

					error=1;

					break;

					}

				}

			}

		else

			{

			if (in == NULL)

				in=argv[i];

			else if (out == NULL)

				out=argv[i];

			else

				error=1;

			}

		}

	if (error) usage();

	/* We either

	 * do checksum or

	 * do encrypt or

	 * do decrypt or

	 * do decrypt then ckecksum or

	 * do checksum then encrypt

	 */

	if (((eflag+dflag) == 1) || cflag)

		{

		if (eflag) do_encrypt=DES_ENCRYPT;

		if (dflag) do_encrypt=DES_DECRYPT;

		}

	else

		{

		if (vflag) 

			{

#ifndef _Windows			

			fprintf(stderr,"des(1) built with %s\n",libdes_version);

#endif			

			EXIT(1);

			}

		else usage();

		}

#ifndef _Windows			

	if (vflag) fprintf(stderr,"des(1) built with %s\n",libdes_version);

#endif			

	if (	(in != NULL) &&

		(out != NULL) &&

#ifndef OPENSSL_SYS_MSDOS

		(stat(in,&ins) != -1) &&

		(stat(out,&outs) != -1) &&

		(ins.st_dev == outs.st_dev) &&

		(ins.st_ino == outs.st_ino))

#else /* OPENSSL_SYS_MSDOS */

		(strcmp(in,out) == 0))

#endif

			{

			fputs("input and output file are the same\n",stderr);

			EXIT(3);

			}

	if (!kflag)

		if (des_read_pw_string(key,KEYSIZB+1,"Enter key:",eflag?VERIFY:0))

			{

			fputs("password error\n",stderr);

			EXIT(2);

			}

	if (in == NULL)

		DES_IN=stdin;

	else if ((DES_IN=fopen(in,"r")) == NULL)

		{

		perror("opening input file");

		EXIT(4);

		}

	CKSUM_OUT=stdout;

	if (out == NULL)

		{

		DES_OUT=stdout;

		CKSUM_OUT=stderr;

		}

	else if ((DES_OUT=fopen(out,"w")) == NULL)

		{

		perror("opening output file");

		EXIT(5);

		}

#ifdef OPENSSL_SYS_MSDOS

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

	{

#include <fcntl.h>

	if (!(uflag && dflag))

		setmode(fileno(DES_IN),O_BINARY);

	if (!(uflag && eflag))

		setmode(fileno(DES_OUT),O_BINARY);

	}

#endif

	doencryption();

	fclose(DES_IN);

	fclose(DES_OUT);

	EXIT(0);

	}

void usage(void)

	{

	char **u;

	static const char *Usage[]={

"des <options> [input-file [output-file]]",

"options:",

"-v         : des(1) version number",

"-e         : encrypt using SunOS compatible user key to DES key conversion.",

"-E         : encrypt ",

"-d         : decrypt using SunOS compatible user key to DES key conversion.",

"-D         : decrypt ",

"-c[ckname] : generate a cbc_cksum using SunOS compatible user key to",

"             DES key conversion and output to ckname (stdout default,",

"             stderr if data being output on stdout).  The checksum is",

"             generated before encryption and after decryption if used",

"             in conjunction with -[eEdD].",

"-C[ckname] : generate a cbc_cksum as for -c but compatible with -[ED].",

"-k key     : use key 'key'",

"-h         : the key that is entered will be a hexadecimal number",

"             that is used directly as the des key",

"-u[uuname] : input file is uudecoded if -[dD] or output uuencoded data if -[eE]",

"             (uuname is the filename to put in the uuencode header).",

"-b         : encrypt using DES in ecb encryption mode, the default is cbc mode.",

"-3         : encrypt using triple DES encryption.  This uses 2 keys",

"             generated from the input key.  If the input key is less",

"             than 8 characters long, this is equivalent to normal",

"             encryption.  Default is triple cbc, -b makes it triple ecb.",

NULL

};

	for (u=(char **)Usage; *u; u++)

		{

		fputs(*u,stderr);

		fputc('\n',stderr);

		}

	EXIT(1);

	}

void doencryption(void)

	{

#ifdef _LIBC

	extern unsigned long time();

#endif

	register int i;

	DES_key_schedule ks,ks2;

	DES_cblock iv,iv2;

	char *p;

	int num=0,j,k,l,rem,ll,len,last,ex=0;

	DES_cblock kk,k2;

	FILE *O;

	int Exit=0;

#ifndef OPENSSL_SYS_MSDOS

	static unsigned char buf[BUFSIZE+8],obuf[BUFSIZE+8];

#else

	static unsigned char *buf=NULL,*obuf=NULL;

	if (buf == NULL)

		{

		if (    (( buf=OPENSSL_malloc(BUFSIZE+8)) == NULL) ||

			((obuf=OPENSSL_malloc(BUFSIZE+8)) == NULL))

			{

			fputs("Not enough memory\n",stderr);

			Exit=10;

			goto problems;

			}

		}

#endif

	if (hflag)

		{

		j=(flag3?16:8);

		p=key;

		for (i=0; i<j; i++)

			{

			k=0;

			if ((*p <= '9') && (*p >= '0'))

				k=(*p-'0')<<4;

			else if ((*p <= 'f') && (*p >= 'a'))

				k=(*p-'a'+10)<<4;

			else if ((*p <= 'F') && (*p >= 'A'))

				k=(*p-'A'+10)<<4;

			else

				{

				fputs("Bad hex key\n",stderr);

				Exit=9;

				goto problems;

				}

			p++;

			if ((*p <= '9') && (*p >= '0'))

				k|=(*p-'0');

			else if ((*p <= 'f') && (*p >= 'a'))

				k|=(*p-'a'+10);

			else if ((*p <= 'F') && (*p >= 'A'))

				k|=(*p-'A'+10);

			else

				{

				fputs("Bad hex key\n",stderr);

				Exit=9;

				goto problems;

				}

			p++;

			if (i < 8)

				kk[i]=k;

			else

				k2[i-8]=k;

			}

		DES_set_key_unchecked(&k2,&ks2);

		OPENSSL_cleanse(k2,sizeof(k2));

		}

	else if (longk || flag3)

		{

		if (flag3)

			{

			DES_string_to_2keys(key,&kk,&k2);

			DES_set_key_unchecked(&k2,&ks2);

			OPENSSL_cleanse(k2,sizeof(k2));

			}

		else

			DES_string_to_key(key,&kk);

		}

	else

		for (i=0; i<KEYSIZ; i++)

			{

			l=0;

			k=key[i];

			for (j=0; j<8; j++)

				{

				if (k&1) l++;

				k>>=1;

				}

			if (l & 1)

				kk[i]=key[i]&0x7f;

			else

				kk[i]=key[i]|0x80;

			}

	DES_set_key_unchecked(&kk,&ks);

	OPENSSL_cleanse(key,sizeof(key));

	OPENSSL_cleanse(kk,sizeof(kk));

	/* woops - A bug that does not showup under unix :-( */

	memset(iv,0,sizeof(iv));

	memset(iv2,0,sizeof(iv2));

	l=1;

	rem=0;

	/* first read */

	if (eflag || (!dflag && cflag))

		{

		for (;;)

			{

			num=l=fread(&(buf[rem]),1,BUFSIZE,DES_IN);

			l+=rem;

			num+=rem;

			if (l < 0)

				{

				perror("read error");

				Exit=6;

				goto problems;

				}

			rem=l%8;

			len=l-rem;

			if (feof(DES_IN))

				{

				for (i=7-rem; i>0; i--)

					RAND_pseudo_bytes(buf + l++, 1);

				buf[l++]=rem;

				ex=1;

				len+=rem;

				}

			else

				l-=rem;

			if (cflag)

				{

				DES_cbc_cksum(buf,&cksum,

					(long)len,&ks,&cksum);

				if (!eflag)

					{

					if (feof(DES_IN)) break;

					else continue;

					}

				}

			if (bflag && !flag3)

				for (i=0; i<l; i+=8)

					DES_ecb_encrypt(

						(DES_cblock *)&(buf[i]),

						(DES_cblock *)&(obuf[i]),

						&ks,do_encrypt);

			else if (flag3 && bflag)

				for (i=0; i<l; i+=8)

					DES_ecb2_encrypt(

						(DES_cblock *)&(buf[i]),

						(DES_cblock *)&(obuf[i]),

						&ks,&ks2,do_encrypt);

			else if (flag3 && !bflag)

				{

				char tmpbuf[8];

				if (rem) memcpy(tmpbuf,&(buf[l]),

					(unsigned int)rem);

				DES_3cbc_encrypt(

					(DES_cblock *)buf,(DES_cblock *)obuf,

					(long)l,ks,ks2,&iv,

					&iv2,do_encrypt);