From 4a9770b8ba9d86db12779f5ae00366bce60a42ad Mon Sep 17 00:00:00 2001
From: Benedict <benedict@0xb8000.de>
Date: Sat, 19 Mar 2016 13:44:55 +0100
Subject: completed task6 nearly completly

just a few characters are still wrong in the key.
freqencies analysis has to be made more comprehensive
---
 task4.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

(limited to 'task4.c')

diff --git a/task4.c b/task4.c
index a1b7b28..11fab98 100644
--- a/task4.c
+++ b/task4.c
@@ -1,19 +1,17 @@
 
 #include "lib.h"
 
-void main() {
+int main() {
 	/** read the file */
 	FILE *fp;
-	int bytes_read;
 	int malloc_size = 62;
 	int line_number = 0;
 	int j;
+	char key;
 	char *string = malloc(malloc_size);
 	char *string2 = malloc(malloc_size);
 	char *cleartext = malloc(malloc_size);
-	char *keys = malloc(255);
-	char single_key;
-	int length;
+	struct key_and_freq tmp;
 
 	fp = fopen("4.txt", "r");
 
@@ -23,19 +21,17 @@ void main() {
 	}
 	
 	while (fscanf(fp, "%61c", string) != EOF) {
+		tmp.hits = 0;
 		j = decode_hex_string(string, string2);
-		length = brute_force_single_byte_xor(string2, j, keys);
-		if (length > 0) {
-			printf("line %i:\n", line_number);
-			for(j=0;j<length;j++) {
-				single_key = keys[j];
-				xor_string(string2, &single_key, cleartext, 1, 60);
-				printf("%s\n", cleartext);
-			}
-		}
+		key = brute_force_single_byte_xor(string2, j, &tmp);
+		xor_string(string2, &key, cleartext, 1, j);
+		if ((!isprintable(cleartext, j)) || (tmp.hits < 10))
+			continue;
+		
+		printf("%s", cleartext);
 		line_number++;
 	}
 
 	fclose(fp);
-
+	return 0;
 }
-- 
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