deleted files which are no longer be used

4 files changed, 0 insertions, 364 deletions

diff --git a/main.c b/main.c
deleted file mode 100644
index e69de29..0000000
--- a/main.c
+++ /dev/null
diff --git a/set1.h b/set1.h
deleted file mode 100644
index e69de29..0000000
--- a/set1.h
+++ /dev/null
diff --git a/task1_hex_to_base64.c b/task1_hex_to_base64.c
deleted file mode 100644
index 8e19f74..0000000
--- a/task1_hex_to_base64.c
+++ /dev/null
@@ -1,364 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <ctype.h>
-
-static const unsigned char base64_encode[] =
-	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-	"abcdefghijklmnopqrstuvwxyz"
-	"0123456789+/";
-
-static const unsigned char hex_encode[] =
-	"0123456789abcdef";
-
-/*
- * This functions accepts a string and returns it base64 encoded
-*/
-void three_bytes_to_base64(char * encode, int bytes_to_print, char *result)
-{
-	unsigned char one, two, three, four;
-	unsigned char tmp;
-	char ret[4];
-	
-	// first six bits
-	one = encode[0] >> 2;
-	ret[0] = base64_encode[one];
-	if(bytes_to_print-- > 0)
-		result[0] = ret[0];
-	// second six bits
-	// two last bits of first byte
-	tmp = encode[0] & 0x03;
-	two = encode[1] >> 4;
-	tmp = tmp << 4;
-	two = tmp | two;
-	ret[1] = base64_encode[two];
-	if(bytes_to_print-- > 0)
-		result[1] = ret[1];
-	// second six bits
-	// two last bits of first byte
-	// third six bits
-	tmp = encode[1] & 0x0F;
-	tmp = tmp << 2;
-	three = encode[2] & 0xC0;
-	three = three >> 6;
-	three = tmp | three;
-	ret[2] = base64_encode[three];
-	if(bytes_to_print-- > 0)
-		result[2] = ret[2];
-	// last six bit11s
-	four = encode[2] & 0x3F;
-	ret[3] = base64_encode[four];
-	ret[4] = '\0';
-	if(bytes_to_print-- > 0)
-		result[3] = ret[3];
-	}
-
-
-
-
-static char string_to_hex_map[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
-				   0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D,
-				   0x0E, 0x0F};
-/*
- * This function converts the first char of a string into its corresponding 
- * hex value
- *
- * @return On Sucess return 0, if char is no valid hex value returns -1
- */
-int hex_char_to_bit(char toEncode)
-{
-	char encode;
-	switch(toEncode) {
-		case '0':
-			encode = string_to_hex_map[0];
-			break;
-		case '1':
-			encode = string_to_hex_map[1];
-			break;
-		case '2':
-			encode = string_to_hex_map[2];
-			break;
-		case '3':
-			encode = string_to_hex_map[3];
-			break;
-		case '4':
-			encode = string_to_hex_map[4];
-			break;
-		case '5':
-			encode = string_to_hex_map[5];
-			break;
-		case '6':
-			encode = string_to_hex_map[6];
-			break;
-		case '7':
-			encode = string_to_hex_map[7];
-			break;
-		case '8':
-			encode = string_to_hex_map[8];
-			break;
-		case '9':
-			encode = string_to_hex_map[9];
-			break;
-		case 'a':
-			encode = string_to_hex_map[10];
-			break;
-		case 'b':
-			encode = string_to_hex_map[11];
-			break;
-		case 'c':
-			encode = string_to_hex_map[12];
-			break;
-		case 'd':
-			encode = string_to_hex_map[13];
-			break;
-		case 'e':
-			encode = string_to_hex_map[14];
-			break;
-		case 'f':
-			encode = string_to_hex_map[15];
-			break;
-		default:
-			return -1;
-	}
-
-	return encode;
-
-}
-
-
-void two_char_hex(char *start, char *result)
-{
-	char first = hex_char_to_bit(start[0]);
-	char second = hex_char_to_bit(start[1]);
-	
-	*result = first;
-	*result = *result << 4;
-	*result = *result | second;
-}
-
-int convert_hex_string_to_character_string(char *encode, char* result)
-{
-	int i;
-	int length = strlen(encode);
-
-	for(i = 0;i< length/2;i++)
-		two_char_hex(&encode[i*2], &result[i]);
-
-	return i;
-}
-
-int convert_to_base64(char *encode, char *result)
-{
-	int length = strlen(encode);
-	
-	int rounds = length / 3;
-	int bytes_last_round = length % 3;
-	int i;
-
-	for (i=0;i<rounds;i++) {
-		three_bytes_to_base64(encode + i*3,4, &result[i*4]);
-	}
-	// in der letzen runde nicht mehr alle ausgeben
-	// nur noch 3-leftover
-	if (bytes_last_round > 0) {
-		three_bytes_to_base64(encode + i*3, 1+bytes_last_round, &result[i*4]);
-
-		for(i=0;i<(3-bytes_last_round);i++)
-			result[i*4+(1+bytes_last_round)] = '=';
-	}
-
-}
-
-void xor_string(char *str1, char *key, char *result)
-{
-	int i, j;
-	int length_key = strlen(key);
-
-	for(i=0, j=0;i<strlen(str1);i++,j++) {
-		if (j >= length_key)
-			j = 0;
-
-		result[i] = str1[i] ^ key[j];
-	}
-}
-
-void xor_string_equal_length(char *str1, char* str2, char *result, int length) {
-	int i;
-	
-	for(i=0;i<length;i++)
-		result[i] = str1[i] ^ str2[i];
-	
-	return;
-		
-}
-
-
-void xor_string_single_byte(char byte, char* string, char *result, int length) {
-	int i;
-
-	for(i=0;i<length;i++)
-		result[i] = string[i] ^ byte;
-
-	result[i] = '\0';
-
-	return;
-}
-
-/**
- * results must be to times bigger than str1
- */
-void hex_binary_to_string(char *str1, char *result, int length)
-{
-	int i;
-	int tmp = 0;
-
-	for(i=0;i<length/2;i++) {
-		tmp = str1[i] & 0xF0;
-		tmp = tmp >> 4;
-		result[i*2] = hex_encode[tmp];
-		tmp = str1[i] & 0x0F;
-		result[(i*2)+1] = hex_encode[tmp];
-	}
-
-	result[i*2] = '\0';
-}
-
-
-
-int score_based_on_frequent_characters(char *string, int length)
-{
-	int number = 0;
-	int i;
-	char tmp;
-
-	for(i=0;i<length;i++) {
-		tmp = tolower(string[i]);	
-		if( tmp == 'e' || tmp == 'a' || tmp == 'i' || tmp == 'o'
-			|| tmp == 'u' )
-			number++;
-	}
-
-	return ((number*100)/length);
-}
-
-int isprintable(char *string, int length)
-{
-	int i;
-
-	for(i=0;i<length;i++) {
-		if(!(isprint(string[i]) || isspace(string[i]))) {
-			return 0;
-		}
-	}
-
-	return 1;
-}
-
-void string_looks_like_it_is_english(char *string, int length)
-{
-	char *xor_tmp = malloc(strlen(string));
-	int i;
-
-	for(i= 0; i< 255; i++) {
-		xor_string_single_byte((char) i, string, xor_tmp, length);
-		if (!isprintable(xor_tmp, length))
-			continue;
-		int score = score_based_on_frequent_characters(xor_tmp, length);
-		if(score > 20)
-			printf("char: %c, score: %i, string: %s\n", (char) i, score, xor_tmp);
-	}
-
-	//free(xor_tmp);
-}
-
-void task4() {
-	/** 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);
-
-	fp = fopen("4.txt", "r");
-
-	if (fp == NULL) {
-		printf("Error open file\n");
-		exit(1);
-	}
-	
-	while (fscanf(fp, "%61c", string) != EOF) {
-		j = convert_hex_string_to_character_string(string, string2);
-		printf("line number: %i, length: %i,\n",  line_number, j);
-		string_looks_like_it_is_english(string2, j);
-		line_number++;
-	}
-
-	fclose(fp);
-
-}
-
-void task5()
-{
-	char *stanze = "Burning 'em, if you ain't quick and nimble\nI go crazy when I hear a cymbal";
-	
-	//printf("%s\n", stanze);
-	char *result = malloc(strlen(stanze));
-	char *printable = malloc(strlen(stanze)*5);
-	xor_string(stanze, "ICE", result);
-	hex_binary_to_string(result, printable, 2*strlen(stanze));
-	printf("%s\n", printable);
-}
-
-
-int main(int argc, char **argv)
-{
-	if (argc == 3 ) {
-		int length = strlen(argv[1]);
-		char *tmp = malloc(length);
-		char *tmp2 = malloc(length);
-		char *base64= malloc(length);
-		char *__xor_string = malloc(length);
-		char *back_hex = malloc(length);
-		int i = convert_hex_string_to_character_string(argv[1], tmp);
-		int j = convert_hex_string_to_character_string(argv[2], tmp2);
-		xor_string_equal_length(tmp, tmp2, __xor_string, strlen(argv[2]));
-		// convert the __xor_string to printable charaters
-		hex_binary_to_string(tmp2, back_hex, strlen(argv[2]));
-		printf("***************************\n");
-		printf("set 1, challelnge 1:\n");
-		printf("input string 1:\n");
-		printf("%s\n", argv[1]);
-		printf("input string 2:\n");
-		printf("%s\n", argv[2]);
-
-		printf("char string of arg 1:\n");
-		printf("%s\n", tmp);
-		printf("char string of arg 2:\n");
-		printf("%s\n", tmp2);
-
-		printf("string 2 from hex back to printable charaters:\n");	
-		printf("%s\n", back_hex);
-		printf("***************************\n");
-		printf("set 1, challenge 2\n");
-		printf("xor string:\n");
-		hex_binary_to_string(__xor_string, back_hex, strlen(argv[2]));
-		printf("%s\n", back_hex);
-
-		printf("***************************\n");
-		printf("set 1, challenge 3\n");
-		//string_looks_
-
-		}
-/*
-	printf("***************************\n");
-	printf("set 1, challenge 4\n");
-	task4();
-*/
-	//printf("***************************\n");
-	//printf("set 1, challenge 5\n");
-	task5();
-
-
-}
diff --git a/task2_fixed_xor.c b/task2_fixed_xor.c
deleted file mode 100644
index e69de29..0000000
--- a/task2_fixed_xor.c
+++ /dev/null