reorgantzied code into libaray file

For every task you may create a new file and implenet the task there by
using functions from the lib.c file.
Added Makefile for the different tasks.

1 files changed, 41 insertions, 0 deletions

diff --git a/task4.c b/task4.c
new file mode 100644
index 0000000..fe812ab
--- /dev/null
+++ b/task4.c
@@ -0,0 +1,41 @@
+
+#include "lib.h"
+
+void main() {
+	/** read the file */
+	FILE *fp;
+	int bytes_read;
+	int malloc_size = 62;
+	int line_number = 0;
+	int j;
+	char *string = malloc(malloc_size);
+	char *string2 = malloc(malloc_size);
+	char *cleartext = malloc(malloc_size);
+	char *keys = malloc(255);
+	char single_key;
+	int length;
+
+	fp = fopen("4.txt", "r");
+
+	if (fp == NULL) {
+		printf("Error open file\n");
+		exit(1);
+	}
+	
+	while (fscanf(fp, "%61c", string) != EOF) {
+		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);
+				printf("%s\n", cleartext);
+			}
+		}
+		line_number++;
+	}
+
+	fclose(fp);
+
+}