/*
 * Copyright 1988 by the Massachusetts Institute of Technology.
 *
 * For copying and distribution information, please see the file
 * <mit-cpyright.h>.
 *
 * exit returns	 0 ==> success
 *		-1 ==> error
 */

#ifndef	lint
static char rcsid_testit_c[] =
#endif	lint

#include <mit-cpyright.h>
#include <stdio.h>
#include <errno.h>
#include <des.h>
#include <afs/param.h>

#define MIN_ARGC	0	/* min # args, not incl flags */
#define MAX_ARGC	2	/* max # args, not incl flags */

/* MIN_ARGC == MAX_ARGC ==> required # args */

extern char *errmsg();
extern int des_string_to_key();
extern int des_key_sched();
extern int des_ecb_encrypt();
extern int des_cbc_encrypt();
extern int des_pcbc_encrypt();

#include "../../permit_xprt.h"

char *progname;
int sflag;
int vflag;
int tflag;
int nflag = 1000;
int cflag;
int des_debug ;
des_key_schedule KS;
unsigned char cipher_text[64];
unsigned char clear_text[64] = "Now is the time for all " ;
unsigned char clear_text2[64] = "7654321 Now is the time for ";
unsigned char clear_text3[64] = {2,0,0,0, 1,0,0,0};
unsigned char *input;

/* 0x0123456789abcdef */
des_cblock default_key = { 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef };
des_cblock s_key;
des_cblock default_ivec = { 0x12,0x34,0x56,0x78,0x90,0xab,0xcd,0xef };
unsigned char *ivec;
des_cblock zero_key = {1};
int i,j;

main(argc,argv)
    int argc;
    char *argv[];
{
    /*	Local Declarations */

    long in_length;

    progname=argv[0];		    /* salt away invoking program */

    /* Assume a long is four bytes */
    if (sizeof(long) != 4) {
	fprintf(stdout,"\nERROR,  size of long is %d",sizeof(long));
	exit(-1);
    }

    while (--argc > 0 && (*++argv)[0] == '-')
	for (i=1; argv[0][i] != '\0'; i++) {
	    switch (argv[0][i]) {

		/* debug flag */
	    case 'd':
		des_debug=1;
		continue;

		/* verbose flag */
	    case 'v':
		vflag = 1;
		continue;

		/* cbc flag */
	    case 'c':
		cflag=1;
		continue;

		/* string to key only flag */
	    case 's':
		sflag = 1;
		continue;

		/* test flag - use known key and cleartext */
	    case 't':
		tflag=1;
		continue;

		/* iteration count */
	    case 'n':
		sscanf(&argv[0][i+1],"%d",&nflag);
		argv[0][i+1] = '\0'; /* force it to stop */
		break;

	    default:
		printf("%s: illegal flag \"%c\" ",
		       progname,argv[0][i]);
		exit(1);
	    }
	};

    if (argc < MIN_ARGC || argc >MAX_ARGC) {
	printf("Usage: xxx [-xxx]  xxx xxx\n");
	exit(1);
    }

    /* argv[0] now points to first non-option arg, if any */

    if (tflag) {
	/* use known input and key */
	des_key_sched(default_key,KS);
	input = clear_text;
	ivec = (unsigned char *) default_ivec;
    }
    else {
	/*des_string_to_key(argv[0],s_key); */
	des_string_to_key("test",s_key);
	if (vflag) {
	    input = (unsigned char *) s_key;
	    fprintf(stdout,"\nstring = %s, key = ",argv[0]);
	    for (i = 0; i<=7 ; i++) fprintf(stdout,"%02x ",*input++);
	}
	des_string_to_key("test",s_key);
	if (vflag) {
	    input = (unsigned char *) s_key;
	    fprintf(stdout,"\nstring = %s, key = ",argv[0]);
	    for (i = 0; i<=7 ; i++) fprintf(stdout,"%02x ",*input++);
	}
	des_key_sched(s_key,KS);
	input = (unsigned char *) argv[1];
	ivec = (unsigned char *)  argv[2];
    }


    if (cflag) {
	fprintf(stdout,"\nclear %s\n",input);
	in_length = strlen(input);
	des_cbc_encrypt(input,cipher_text,(long) in_length,KS,ivec,1);
	fprintf(stdout,
		"\n\nencrypted ciphertext = (low to high bytes)");
	for (i = 0; i <= 7; i++) {
	    fprintf(stdout,"\n");
	    for (j = 0; j <= 7; j++)
		fprintf(stdout,"%02x ",cipher_text[i*8+j]);
	}
	des_cbc_encrypt(cipher_text, clear_text,
		    (long) in_length, KS, ivec, 0);
	fprintf(stdout,"\n\ndecrypted clear_text = %s",clear_text);

	fprintf(stdout,"\nclear %s\n",input);
	input = clear_text2;
	des_cbc_cksum(input,cipher_text,(long) strlen(input),KS,ivec,1);
	fprintf(stdout,
		"\n\nencrypted cksum = (low to high bytes)\n");
	for (j = 0; j <= 7; j++)
	    fprintf(stdout,"%02x ",cipher_text[j]);

	/* test out random number generator */
	for (i = 0; i <= 7; i++) {
	    des_random_key(cipher_text);
	    des_key_sched(cipher_text,KS);
	    fprintf(stdout,
		    "\n\nrandom key = (low to high bytes)\n");
	    for (j = 0; j<=7; j++)
		fprintf(stdout,"%02x ",cipher_text[j]);
	}
    }
    else {
	if (vflag)
	    fprintf(stdout,"\nclear %s\n",input);
	do_encrypt(input,cipher_text);
	do_decrypt(clear_text,cipher_text);
    }
}

flip(array)
    char *array;
{
    register old,new,i,j;
    /* flips the bit order within each byte from 0 lsb to 0 msb */
    for (i = 0; i <= 7; i++) {
	old = *array;
	new = 0;
	for (j = 0; j <= 7; j++) {
	    if (old & 01) new = new | 01;
	    if (j < 7) {
		old = old >> 1;
		new = new << 1;
	    }
	}
	*array = new;
	array++;
    }
}

do_encrypt(in,out)
    char    *in;
    char    *out;
{
    for (i = 1; i <= nflag; i++) {
	des_ecb_encrypt(in,out,KS,1);
	if (vflag) {
	    fprintf(stdout,"\nclear %s\n",in);
	    for (j = 0; j <= 7; j++)
		fprintf(stdout,"%02 X ",in[j] & 0xff);
	    fprintf(stdout,"\tcipher ");
	    for (j = 0; j<=7; j++)
		fprintf(stdout,"%02X ",out[j] & 0xff);
	}
    }
}

do_decrypt(in,out)
    char    *out;
    char    *in;
    /* try to invert it */
{
    for (i = 1; i <= nflag; i++) {
	des_ecb_encrypt(out,in,KS,0);
	if (vflag) {
	    fprintf(stdout,"\nclear %s\n",in);
	    for (j = 0; j <= 7; j++)
		fprintf(stdout,"%02X ",in[j] & 0xff);
	    fprintf(stdout,"\tcipher ");
	    for (j = 0; j<=7; j++)
		fprintf(stdout,"%02X ",out[j] & 0xff);
	}
    }
}
