commit f21294b03b47e870990c10d76bf6ed999e6fb1f0
Author: Bucchino Geoffrey <geoffrey.bucchino@protonmail.com>
Date:   Thu Oct 21 19:51:45 2021 +0200

    Initial commit

diff --git a/cesar.c b/cesar.c
new file mode 100755
index 0000000..c7bf99e
--- /dev/null
+++ b/cesar.c
@@ -0,0 +1,95 @@
+#include "cesar.h"
+
+/*
+	s -> path source
+	d -> path destination
+	key -> key of encryption
+	This function encrypt data
+*/
+int cryptCesar(const char *s, const int key, const int countCharact, char *bufferDst) {
+	char *buffer;
+	int i;
+	int error = countCharact;
+
+	if(error == -1) return error;
+
+	/* Allocation dynamique */
+	buffer = malloc(countCharact + 1); /* + 1 for '\0' */
+
+	/* Copy the data of file in the buffer[] */
+	error = copyFile(s, buffer);
+	if(error != 0) return error;
+
+	/********* Encryption **********/
+	for(i = 0; i < countCharact; i++) {
+		int val = 0;
+		/* For characters of A to Z */
+		if(buffer[i] >= 'A' && buffer[i] <= 'Z') {
+			if(buffer[i] + key > 'Z')
+				val = ((buffer[i] - 'A')-26) + key + 'A';
+			else
+				val = (buffer[i] - 'A') + key + 'A';
+		}
+		/* For characters of 'a' to 'z' */
+		else if(buffer[i] >= 'a' && buffer[i] <= 'z') {
+			if(buffer[i] + key > 'z')
+				val = ((buffer[i] - 'a')- 26) + key + 'A';
+			else
+				val = (buffer[i] - 'a') + key + 'A';
+		}
+		/* For others characters */
+		else val = buffer[i];
+
+		bufferDst[i] = val;
+	}
+	
+	bufferDst[i] = '\0';
+
+	/* Freedom the memory */
+	free(buffer);
+	
+	return error;
+}
+/*
+	s -> path source
+	d -> path destination
+	key -> key of decryption
+	This function decryption by Cesar
+*/
+int decryptCesar(const char *s, const int key, const int countCharact, char *bufferDst) {
+	int error = countCharact;
+	char *buffer;
+	int i;
+
+	if(error == -1) 
+		return error;
+
+	/* Allocation dynamique */
+	buffer = malloc(countCharact + 1); /* +1 for '\0' */
+
+	/* Copy the data from file to buffer */
+	error = copyFile(s, buffer);
+	if(error != 0) return error;
+
+	/********* Decryption **********/		
+	for(i = 0; i < countCharact; i++) {
+		int val = 0;
+		/* buffer[i] >= 'A' AND buffer[i] <= 'Z' */
+		if(buffer[i] >= 65 && buffer[i] <= 90) {
+			val = buffer[i] - key;
+			/* val < 'A' */
+			if(val < 65)
+				val = val + 26;
+		}
+		else
+			val = buffer[i];
+
+		bufferDst[i] = val;
+	}
+	bufferDst[i] = '\0';
+	
+	/* Freedom the memory */
+	free(buffer);
+
+	return error;
+}
diff --git a/cesar.h b/cesar.h
new file mode 100755
index 0000000..148f64d
--- /dev/null
+++ b/cesar.h
@@ -0,0 +1,13 @@
+#ifndef H_INFLATE
+#define H_INFLATE
+
+#define SIZE_MAX_FILE 8192
+
+#include "functions.h"
+
+/* Functions */
+void inflate();
+int cryptCesar(const char *s, const int key, const int countCharact, char *bufferDst);
+int decryptCesar(const char *s, const int key, const int countCharact, char *bufferDst);
+
+#endif
diff --git a/exec.sh b/exec.sh
new file mode 100755
index 0000000..4adf144
--- /dev/null
+++ b/exec.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+gcc -W main.c functions.c cesar.c vigenere.c -o main && ./main $1 $2 $3 $4
diff --git a/functions.c b/functions.c
new file mode 100755
index 0000000..9a90af4
--- /dev/null
+++ b/functions.c
@@ -0,0 +1,103 @@
+#include "functions.h"
+
+void usage() {
+	printf("Usage: [options] [crypt|decrypt] [file]\n");
+	printf("Options:\n");
+	printf("\t-c: chiffrement de Cesar\n");
+	printf("\t-v: chiffrement de Vigenere\n");
+	printf("\t-t: chiffrement par transposition\n");
+}
+int fileExist(const char *path) {
+	FILE *f=NULL;
+	f=fopen(path,"r");
+
+	if(f==NULL){
+		return -1;
+	}
+	fclose(f);
+	return 0;
+}
+/*
+	path -> path source
+	This function copy all characters of the file in the buffer
+*/
+int copyFile(const char *path, char *buffer) {
+	FILE *f = fopen(path, "r+");
+	int caract = 0;
+	int i = 0;
+
+	if(f == NULL) return -1;
+
+	/* Copy the characters */
+	do {
+		caract = fgetc(f);
+		buffer[i] = caract;
+		i++;
+	}while(caract != EOF);
+
+	/* add '\0' */
+	buffer[i-1] = '\0';
+
+	fclose(f);
+
+	return 0;
+}
+/*
+	s -> path source
+	This function count the number of characters in the file
+	return -1 -> error
+*/
+int fileNumberCaract(const char *s) {
+	FILE *f = NULL;
+	int count = 0;
+
+	f = fopen(s, "r+");
+	if(f == NULL) return -1;
+
+	/* Read character by character */
+	while(fgetc(f) != EOF)
+		count++;
+
+	fclose(f);
+
+	return count;
+}
+/*
+	data -> data add in the file
+	path ->path of the file
+	This function add the data to file
+	error : -2 -> impossible to open the file dest
+*/
+int addDataToFile(const char *data, const char *path) {
+	FILE *f = fopen(path, "w+");
+
+	if(f == NULL) return -2;
+
+	fputs(data, f);
+
+	fclose(f);
+
+	return 0;
+}
+/*
+	This function display the error 
+	Error :
+	0 -> no error for encryption
+	1 -> no error for decryption
+	-1 -> impossible to open the file source
+	-2 -> impossible to open the file dest
+*/
+void err(const int error, const char *path) {
+	switch(error) {
+	case 0 :
+		printf("Vos donnees ont bien etait crypter ou decrypter dans le fichier %s.\n", path);
+		break;
+	case -1 :
+		printf("Une erreur s'est produite durant l'ouverture du fichier %s\n", path);
+		break;
+	case -2 :
+		printf("Une erreur s'est produite durant l'ouverture du fichier %s\n", path);
+	default:
+		break;
+	}
+}
diff --git a/functions.h b/functions.h
new file mode 100755
index 0000000..526072f
--- /dev/null
+++ b/functions.h
@@ -0,0 +1,16 @@
+#ifndef H_FUNCTIONS
+#define H_FUNCTIONS
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Functions */
+void usage();
+int fileExist(const char *path);
+int copyFile(const char *path, char *buffer);
+int addDataToFile(const char *data, const char *path);
+int fileNumberCaract(const char *s);
+void err(const int error, const char *path);
+
+#endif
diff --git a/main b/main
new file mode 100755
index 0000000..1ab9ee1
Binary files /dev/null and b/main differ
diff --git a/main.c b/main.c
new file mode 100755
index 0000000..fc81fe5
--- /dev/null
+++ b/main.c
@@ -0,0 +1,116 @@
+#include "functions.h"
+#include "cesar.h"
+#include "vigenere.h"
+
+int main(int argc, char *argv[]) {
+	int error = 0;
+	int numberCharacters = 0;
+	char *options[3] = {"-c","-v","-t"};
+	char *hook, *fileSrc, *fileDst, *buffer;
+	size_t sFile, i;
+
+	if(argc != 4) {
+		usage();
+	}
+
+	// Check options
+	for(i = 0; i < 3; i++){
+		if(strcmp(argv[1], options[i]) == 0){
+			error++;
+		}
+	}	
+
+	if(error == 0) {
+		usage();
+		return -1;
+	}
+
+	// Check crypt|decrypt
+	if(strcmp(argv[2], "crypt") != 0 && strcmp(argv[2], "decrypt") != 0){
+		usage();
+		return -1;
+	}
+
+	hook = argv[2];
+
+	// Check file exist
+	error = fileExist(argv[3]);
+	if(error == -1){
+		printf("File doesn't exist\n");
+		// usage();
+		return -1;
+	}
+
+	fileSrc = argv[3];
+
+	if(strcmp(hook, "crypt") == 0) sFile = sizeof(char) + strlen(fileSrc) + 5;	
+	else sFile = sizeof(char) + strlen(fileSrc) + 7;
+
+	fileDst = malloc(sFile);
+
+	for(i = 0; i < strlen(fileSrc); i++){
+		fileDst[i] = fileSrc[i];
+	}
+
+	fileDst[i++] = '.';
+	if(strcmp(hook, "decrypt") == 0){
+		fileDst[i++] = 'd';
+		fileDst[i++] = 'e';	
+	}
+	fileDst[i++] = 'c';
+	fileDst[i++] = 'r';
+	fileDst[i++] = 'y';
+	fileDst[i++] = 'p';
+	fileDst[i++] = 't';
+	fileDst[i++] = '\0';
+
+	// Get size of the file
+	numberCharacters = fileNumberCaract(fileSrc);
+
+	// Malloc the dest buffer
+	buffer = malloc(sizeof(int) * numberCharacters);
+	memset(buffer, 0, sizeof(int) * numberCharacters);
+
+	if(strcmp(argv[1], "-c") == 0){
+		// Get key
+		int key;
+
+		do{
+			printf("Votre cle de chiffrement (entre 1 et 26): ");
+			scanf("%d",&key);
+		}while(key < 1 || key > 26);
+
+		if(strcmp(hook, "crypt") == 0)
+			error = cryptCesar(argv[3], key, numberCharacters, buffer);
+		if(strcmp(hook, "decrypt") == 0)
+			error = decryptCesar(argv[3], key, numberCharacters, buffer);
+
+	}
+	else if(strcmp(argv[1], "-v") == 0){
+		// Get key
+		char *key = malloc(8);
+
+		
+		if(strcmp(hook, "crypt") == 0)
+			error = cryptVigenere(key, argv[3], buffer);
+
+		free(key);
+	}
+	else if(strcmp(argv[1], "-t") == 0){
+		// Get key
+	}
+
+	// Add data to file
+	addDataToFile(buffer, fileDst);
+
+	/* Display error */
+	/*
+	 * if(error == 0) err(error, fileDst);
+	 * else if(error == -1) err(error, fileSrc);
+	 * else if(error == -2) err(error, fileDst);
+	 */
+
+	free(fileDst);
+	free(buffer);
+	return 0;
+}
diff --git a/test.txt b/test.txt
new file mode 100755
index 0000000..19afb5a
--- /dev/null
+++ b/test.txt
@@ -0,0 +1,2 @@
+Hello world!
+Je suis un message en clair !!
diff --git a/test.txt.crypt b/test.txt.crypt
new file mode 100644
index 0000000..e69de29
diff --git a/test.txt.crypt.decrypt b/test.txt.crypt.decrypt
new file mode 100644
index 0000000..4ab6fa4
--- /dev/null
+++ b/test.txt.crypt.decrypt
@@ -0,0 +1,2 @@
+HELLO WORLD!
+JE SUIS UN MESSAGE EN CLAIR !!
diff --git a/vigenere.c b/vigenere.c
new file mode 100644
index 0000000..388909f
--- /dev/null
+++ b/vigenere.c
@@ -0,0 +1,9 @@
+#include "vigenere.h"
+
+int cryptVigenere(const char *key, const char *data, char *bufferDst) {
+	int error = 0;
+
+	printf("Vigenere\n");
+
+	return error;
+}
diff --git a/vigenere.h b/vigenere.h
new file mode 100644
index 0000000..b05034e
--- /dev/null
+++ b/vigenere.h
@@ -0,0 +1,8 @@
+#ifndef H_VIGENERE
+#define H_VIGENERE
+
+#include "functions.h"
+
+int cryptVigenere(const char *key, const char *data, char *bufferDst);
+
+#endif