#include "../lib/lib.h"


int main(int arc, char **argv)
{
	// detect AEC in ECB mode, do NOT break it
	int number_blocks, i, j, k, read = 0;
	size_t len = 0;
	int max_hits = 0, hits = 0, line_number= 0, aes_ecb_line = 0;
	char *line_hex = NULL;
	// read file
	FILE *f = fopen("8.txt", "r");

	if (f == NULL) {
		perror("failed to open 8.txt");
		exit(1);
	}

	while( (read = getline(&line_hex, &len, f)) != -1) {
		// line is hex encoded 
		char *line = malloc(read/2+1);

		decode_hex_string(line_hex, line);

		number_blocks = read / 2 / 16;
		// count 16 byte blocks which are equal
		for(i=0;i<number_blocks;i++) {
			for(j=1;j<number_blocks;j++) {
				for(k=0;k<16;k++) {
					if(line[i*16+k] != line[j*16+k])
						break;

					if ( k == 15)
						hits++;
				}
			}
		}
		printf("line: %i, hits: %i\n", line_number, hits);
		if (hits > max_hits) {
			max_hits = hits;
			aes_ecb_line = line_number;
		}
		line_number++;
		hits = 0;
		free(line_hex);
		free(line);
		// set line and len to null
		line = NULL;
		len = 0;
	}

	printf("found AES-128-ECB at line: %i\n with %i hits", aes_ecb_line, max_hits);

	return 0;
}