first commit

.gitignore

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+bin/

Makefile

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+LIBRARIES = -Iinclude
+SOURCES = ./cmd/strenc.c
+OUTPUT_DIR = ./bin
+OUTPUT = -o ${OUTPUT_DIR}/PROG
+INSTALL_OUTPUT = ${OUTPUT_DIR}/PROG
+
+build: output_dir
+	gcc -Wall ${SOURCES} ${OUTPUT:PROG=strenc} ${LIBRARIES} 
+
+debug: output_dir
+	gcc -Wall -g ${SOURCES} ${OUTPUT:PROG=strenc} ${LIBRARIES}
+
+output_dir:
+	mkdir -p ${OUTPUT_DIR}
+
+clean:
+	rm -rf $(OUTPUT_DIR) ${CERT_DIR} **.h.gch
+

cmd/strenc.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <time.h>
+
+// Local includes
+#include "strenc.h"
+
+// Open file and return point to char containing file contents
+unsigned char *openFile(char *fileName) {
+	size_t c = 0;
+	size_t size = 8;
+	unsigned char *buf = malloc(size);
+
+	FILE *fp;
+	fp = fopen(fileName, "r");
+
+	for (size_t i = 0; (c = fgetc(fp)) != EOF; i++) {
+		if (i == size) { // If size of current buffer need to be doubled
+			size *= 2;
+			buf = reallocarray(buf, size, sizeof(unsigned char));
+			if (buf == NULL) {
+				printf("Error resizing array, exiting...\n");
+				exit(EXIT_FAILURE);
+			}
+		}
+		buf[i] = c;
+	}
+
+	fclose(fp);
+	return buf;
+}
+
+unsigned char *genKey(unsigned char *pt) {
+	unsigned char *key = malloc(strlen((char *)pt));
+	srand(time(NULL));
+
+	// rand() should not normally be used for
+	// generating secure numbers, we do not care
+	// here
+	for (int i = 0; i < strlen((char *)pt); i++) {
+		key[i] = rand();
+	}
+
+	return key;
+}
+
+unsigned char *xorCharArray(unsigned char *text, unsigned char *key) {
+	unsigned char *ft = malloc(strlen((char *)text));
+
+	for (int i = 0; i < strlen((char *)text); i++) { // Xor pt & key
+		ft[i] = text[i] ^ key[i];
+	}
+
+	return ft;
+}
+
+int printCStyleCharArray(unsigned char *text, unsigned char *key) {
+	// Print text
+	printf("unsigned char text[%zu] = { ", strlen((char *)text));
+	for (int i = 0; i < strlen((char *)text); i++) {
+		printf("0x%02X", text[i]);
+		if ((i + 1) == strlen((char *)text)) {
+			printf(" ");
+		} else {
+			printf(", ");
+		}
+	}
+	printf("};\n");
+	// Print key
+	printf("unsigned char text_key[%zu] = { ", strlen((char *)key));
+	for (int i = 0; i < strlen((char *)key); i++) {
+		printf("0x%02X", key[i]);
+		if ((i + 1) == strlen((char *)key)) {
+			printf(" ");
+		} else {
+			printf(", ");
+		}
+	}
+	printf("};\n");
+	return 0;
+}
+
+int main(int argc, char **argv) {
+	unsigned char *pt = malloc(sizeof(unsigned char));
+	unsigned char *key = malloc(sizeof(unsigned char));
+	unsigned char *ct = malloc(sizeof(unsigned char));
+
+	// Setting up options
+	static const struct option long_options[] = {
+		{"help", no_argument, NULL, 'h'},
+		{"file", required_argument, NULL, 'f'},
+		{"string", required_argument, NULL, 's'},
+		{0, 0, 0, 0}
+	};
+
+	const char* usage =
+		"Usage strenc [options]\n\n"
+		"  -h --help\t\t\tShows this message\n"
+		"  -f --file\t\t\tInput file to be xored\n"
+		"  -s --string\t\t\tInput string to be xored\n"
+		"\n";
+
+	int c; // Used to grab individual args
+	while(1) {
+		int option_index = 0;
+		c = getopt_long(argc, argv, "hf:s:", long_options, &option_index);
+		if (c == -1) { // Break if no more args are present
+			break;
+		}
+		switch(c) {
+			case 'h':
+				printf("%s", usage);
+				exit(EXIT_SUCCESS);
+			case 'f':
+				if (strlen((char *)pt) != 0) { // Exit if string is already set
+					printf("Error string input already set\n");
+					exit(EXIT_FAILURE);
+				}
+				pt = openFile(optarg);
+				break;
+			case 's':
+				if (strlen((char *)pt) != 0) { // Exit if file is already set
+					printf("Error file input already set\n");
+					exit(EXIT_FAILURE);
+				}
+				pt = malloc(strlen(optarg));
+				strcpy((char *)pt, optarg);
+				break;
+		}
+	}
+	if (strlen((char *)pt) == 0) { // Exit if plain text is not > len 0
+		printf("Plain text has not been set\n");
+		exit(EXIT_FAILURE);
+	}
+
+	key = genKey(pt);
+	ct = xorCharArray(pt, key);
+
+	printCStyleCharArray(ct, key);
+
+	// Freeing memory and returning
+	free(pt);
+	free(key);
+	free(ct);
+	exit(EXIT_SUCCESS);
+}
+

include/strenc.h

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+#include <stdio.h>
+#include <stdint.h>
+
+unsigned char *openFile(char *fileName);
+unsigned char *genKey(unsigned char *pt);
+unsigned char *xorCharArray(unsigned char *text, unsigned char *key);
+int printCStyleCharArray(unsigned char *text, unsigned char *key);
+int main(int argc, char **argv);
+