From 7b349fa9046db73bc10cd7701bd3a1dd0967bd5e Mon Sep 17 00:00:00 2001
From: fauvet <login@domain.exemple>
Date: Mon, 2 Jan 2023 15:25:51 +0100
Subject: [PATCH] =?UTF-8?q?Bonjour=20monsieu,=20suites=20a=20de=20nombreux?=
 =?UTF-8?q?=20probl=C3=A8mes,=20je=20n'ai=20pas=20pu=20vous=20envoy=C3=A9?=
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 =?UTF-8?q?pas=20de=20machine=20virtuelle.=20Si=20vous=20avez=20un=20doute?=
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 =?UTF-8?q?rit=20de=20vous=20r=C3=A9f=C3=A9r=C3=A9=20aux=20date=20de=20mod?=
 =?UTF-8?q?ifications=20et=20cr=C3=A9ations=20de=20ceux=20ci.=20Cordialeme?=
 =?UTF-8?q?nt,=20Fauvet=20Matthis?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 cle.c              |  93 +++++++++++++++++++++++++++++++++++++++++++++
 executable         | Bin 0 -> 21016 bytes
 fichier_cle.txt    |   1 +
 fichier_crypte.txt |   1 +
 fichier_dcrpt.txt  |   1 +
 fichier_txt.txt    |   1 +
 6 files changed, 97 insertions(+)
 create mode 100644 cle.c
 create mode 100755 executable
 create mode 100644 fichier_cle.txt
 create mode 100644 fichier_crypte.txt
 create mode 100644 fichier_dcrpt.txt
 create mode 100644 fichier_txt.txt

diff --git a/cle.c b/cle.c
new file mode 100644
index 0000000..45896d0
--- /dev/null
+++ b/cle.c
@@ -0,0 +1,93 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+void gen_cle(char* chemincle,char* chemintxt){
+    /* Fonction qui génère une clé en fonction de la taille du
+    message laissé par l'utilisateur*/
+
+    /* On ouvre les flux pour enregistrer les éléments.*/
+    FILE* flux_c, *flux_t;
+    srand(time(NULL));
+
+    /* On créer des variables pour stockers nos futurs infos*/
+    char stck[2];
+    char elt[1];
+
+    /* Ouverture des fichiers */
+    flux_t = fopen(chemintxt, "r");
+    flux_c = fopen(chemincle, "w");
+
+    /* On parcours 1 a 1 tous les char  que le fichier avec le 
+    message de l'utilisateur*/
+    while(fread(stck, sizeof(char), 1, flux_t)){
+        /* Pour chaques elts, on ajoute un char de la table ASCII
+        en guise de char pour la cle*/
+        elt[0] = (char) random()%256;
+        fwrite(elt , sizeof(char), 1, flux_c);
+    }
+
+    fclose(flux_c);
+    fclose(flux_t);
+}
+
+void gen_mot_cryp(char* chemincle, char* chemintxt, char* chemincrypte){
+    /* Cette fonction tranforme un message no crypté en un 
+    crypté grace a la clé de cryptage / décryptage */
+    FILE* flux_c, *flux_t, *flux_crpt;
+
+    char stck[2];
+    char stckd[2];
+    char elt[1];
+    
+    flux_t = fopen(chemintxt, "r");
+    flux_c = fopen(chemincle, "r");
+    flux_crpt = fopen(chemincrypte, "w");
+
+    /* Pour crypter le message, on prend la valeur décimale du x 
+    elt de la cle qu'on aditionne a la valeur decimal du x elt du
+    message de l'utilisateur*/
+    while((fread(stck, sizeof(char), 1, flux_t)) && (fread(stckd, sizeof(char), 1, flux_c))){
+        elt[0] = (char) (((int) stck[0] + (int) stckd[0] )%256);
+        fwrite(elt , sizeof(char), 1, flux_crpt);
+    }
+
+    fclose(flux_t);
+    fclose(flux_c);
+    fclose(flux_crpt);
+}
+
+void decrypt(char* chemincle, char* chemincrypte, char* chemin_decrpt){
+    /* Cette fonctione permet de décrypter le message, 
+    tandis que nous avons aditionner le message a la clé
+    Cette fois, nous allons soustraire les valeurs de la clé aux
+    valeurs du texte crypté*/
+    FILE* flux_c, *flux_crpt, *flux_dcrpt;
+
+    char stck[2];
+    char stckd[2];
+    char elt[1];
+    
+    flux_c = fopen(chemincle, "r");
+    flux_crpt = fopen(chemincrypte, "r");
+    flux_dcrpt = fopen(chemin_decrpt, "w");
+
+    while((fread(stck, sizeof(char), 1, flux_crpt)) && (fread(stckd, sizeof(char), 1, flux_c))){
+        /* N valeurs décimal des chars du txt_crypté - N valeurs décimals des chars de la clé */
+        elt[0] = (char) (((int) stck[0] - (int) stckd[0])%256);
+        fwrite(elt , sizeof(char), 1, flux_dcrpt);
+    }
+
+    fclose(flux_c);
+    fclose(flux_crpt);
+    fclose(flux_dcrpt);
+}
+
+int main(void){
+    /*Apelles des fonctions.*/
+    gen_cle("fichier_cle.txt", "fichier_txt.txt");
+    gen_mot_cryp("fichier_cle.txt", "fichier_txt.txt", "fichier_crypte.txt");
+    decrypt("fichier_cle.txt", "fichier_crypte.txt", "fichier_dcrpt.txt");
+    return 0;
+}
+
diff --git a/executable b/executable
new file mode 100755
index 0000000000000000000000000000000000000000..3ecac1132c2b1f3fb13016217b443c5f6de70a57
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diff --git a/fichier_cle.txt b/fichier_cle.txt
new file mode 100644
index 0000000..69256d8
--- /dev/null
+++ b/fichier_cle.txt
@@ -0,0 +1 @@
+Ü.ª¡ž¿‰ð;Õ·
\ No newline at end of file
diff --git a/fichier_crypte.txt b/fichier_crypte.txt
new file mode 100644
index 0000000..83633f1
--- /dev/null
+++ b/fichier_crypte.txt
@@ -0,0 +1 @@
+$“

ßà_­A8
\ No newline at end of file
diff --git a/fichier_dcrpt.txt b/fichier_dcrpt.txt
new file mode 100644
index 0000000..c57eff5
--- /dev/null
+++ b/fichier_dcrpt.txt
@@ -0,0 +1 @@
+Hello World!
\ No newline at end of file
diff --git a/fichier_txt.txt b/fichier_txt.txt
new file mode 100644
index 0000000..c57eff5
--- /dev/null
+++ b/fichier_txt.txt
@@ -0,0 +1 @@
+Hello World!
\ No newline at end of file