From 4ed371cc378a3b579d46ed89a2677769a6d5ea24 Mon Sep 17 00:00:00 2001
From: Benedict <benedict@0xb8000.de>
Date: Tue, 22 Mar 2016 19:11:22 +0100
Subject: completed set 2 challenge 11

---
 set1/task8.c | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

(limited to 'set1/task8.c')

diff --git a/set1/task8.c b/set1/task8.c
index 98b3380..d3aa8a8 100644
--- a/set1/task8.c
+++ b/set1/task8.c
@@ -4,9 +4,9 @@
 int main(int arc, char **argv)
 {
 	// detect AEC in ECB mode, do NOT break it
-	int number_blocks, i, j, k, read = 0;
+	int read = 0;
 	size_t len = 0;
-	int max_hits = 0, hits = 0, line_number= 0, aes_ecb_line = 0;
+	int line_number= 0, aes_ecb_line = 0;
 	char *line_hex = NULL;
 	// read file
 	FILE *f = fopen("8.txt", "r");
@@ -19,29 +19,12 @@ int main(int arc, char **argv)
 	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;
+		printf("line %i: ", line_number);	
+		if (string_is_ecb_encrypted(line, read/2+1, 16)) {
 			aes_ecb_line = line_number;
 		}
 		line_number++;
-		hits = 0;
 		free(line_hex);
 		free(line);
 		// set line and len to null
@@ -49,7 +32,7 @@ int main(int arc, char **argv)
 		len = 0;
 	}
 
-	printf("found AES-128-ECB at line: %i\n with %i hits", aes_ecb_line, max_hits);
+	printf("found AES-128-ECB at line: %i\n", aes_ecb_line);
 
 	return 0;
 }
-- 
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