IDEA ofb of a file with passwords

Script started on Tue Sep 16 12:06:35 1997
sh-2.00$ cat ideaofb1.c
/* Use OFB with IDEA to encrypt (or decrypt) a file. */
#include <stdio.h>
#include <fcntl.h>
#include "/usr/local/ssl/include/idea.h"

unsigned char  key[128];

unsigned char iv[] = {
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x01
};

void main(int argc, char * argv[])
{
	int i;
	int num = 0;
	int fd, fd2;
	unsigned char buffer[8];
	unsigned char output[8];
	IDEA_KEY_SCHEDULE enc;
	/* Argument check. */
	if(argc < 3)
	{
		printf("usage: ideaofbenc file file\n");
		exit(1);
	}
	/* Try to open both files, creating output file if necessary. */
	if((fd = open(argv[1], O_RDONLY, 0) ) < 0)
	{
		perror(argv[1]);
		exit(1);
	}
	if((fd2 = open(argv[2], O_WRONLY | O_CREAT, 0666)) < 0)
	{
		perror(argv[2]);
		exit(1);
	}
	
	/* Get a key from the user. */
	/* We'll ask for two passwords. */
	des_read_password(key,"Enter first password ", 0);
	des_read_password(key+8, "Enter second password ", 0);
	/* And yet another to set the IV. */
	des_read_password(iv, "Enter third password ", 0);
	/* We don't need a decryption schedule for OFB. */
	idea_set_encrypt_key(key, &enc);
	/* Try encrypting one byte at a time. */
	/* Could improve this by increasing the size of the reads
		and writes. */
	while( read(fd, buffer, 1) > 0)
	{
		idea_ofb64_encrypt(buffer, output, 1, &enc, iv, &num);
		write(fd2, output, 1);	
	}
	close(fd);
	close(fd2);
}

sh-2.00$ ideaofb1 testdata test3
Enter first password 
Enter second password 
Enter third password 
sh-2.00$ ideaofb1 test3 test4
Enter first password 
Enter second password 
Enter third password 
sh-2.00$ exit
exit

script done on Tue Sep 16 12:07:31 1997