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@ -12,5 +12,8 @@ Cryptographie - Outils et algorithmes
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- cm : [Chiffrements par bloc, algorithmes à clefs publiques](cours/crypto.pdf).
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- tp : [Substitution-Permutation-Network](td_tp/tp2)
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#### Semaine 3
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- cm : [Algorithmes à clefs publiques](cours/crypto.pdf).
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- tp : [Diffie-Hellman](td_tp/tp3)
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## TP3
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> Le but du tp est de mettre en oeuvre une communication sécurisée entre
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> un client et un serveur, en deux phases :
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> - Echange d'une clé.
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> - Cryptage de la communication par un algorithme de chiffrement
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> symétrique à l'aide de la clé echangée. (XTEA pour ce tp)
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[Rappel de cours](../cours/crypto.pdf)
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### Diffie-Hellman
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<div align="center">
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<img src="./dh.png">
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</div>
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Le système (et sa sécurité) de Diffie-Hellman repose sur la difficulté
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pratique, pour des grands nombres, de calculer le logarithme discret
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dans un groupe multiplicatif $\mathbb{Z}_{p}^{*}$ avec $p$
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premier.
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On rappelle que lorsque $p$ est premier, $\mathbb{Z}_{p}^{*}$ est cyclique. Si $g$ est un générateur,
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tout élément $x\in \mathbb{Z}_{p}^{*}$ s'écrit (de manière
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unique) sous la forme
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\[
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x=g^a,\ \ 1\leq a \leq p-1
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\]
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<!--\\((\\mathbb{Z}_{p}^{\*},.)\\) est ismorphe au groupe additif
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\\((\\mathbb{Z}_{p-1},+)\\)-->
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Par définition, $a$ est le logarithme (discret) de $x$ dans la
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base $g$ noté
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\[
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a=\log_{g}(x)
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\]
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Le schéma en haut de la page illustre comment deux entités peuvent
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échangés une clef. Alice génére $p$, un générateur $g$. Il
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choisit un nombre aléatoire $a$ ($2\leq a\leq p-2$), et envoie
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à Bob le triplet $((p,g,g^a)$. Bob recoit le triplet, et choisit un
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nombre $b$. Il envoie à Alice $g^b$. La clé calculée par Alice,
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et Bob est
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\|
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(g^a)^b = (g^b)^a= g^{ab}
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\]
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Pour calculer la clé, il faut connaître $ab$. Or seuls $g^a$ et
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$g^b$ ont été échangés. Ce qui nous ramène au problème du
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logarithme discret qui est difficile en pratique pour des grands
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nombres.
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##### Votre travail
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Le but du tp est d'écrire un client/serveur TCP :
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- Le client et le serveur utilise Diffie-Hellman pour échanger une clé
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sur 16 octets. On utilisera des nombres premiers de Sophie Germain.
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- Le client saisit un message de l'utilisateur, le chiffre avec XTEA,
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et envoit le message chiffré.
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- Le serveur reçoit le message chiffré, le déchiffre, et l'affiche.
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1. Trouver un générateur peut-être long. En effet, tout ce qu'on l'on
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sait sur l'ordre d'un élément de $\mathbb{Z}_p^{*}$, c'est
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qu'il divise l'ordre du groupe, i.e $p-1$. Pour que la
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vérification soit plus rapide, on s'interesse aux nombres premiers
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dit de Sophie Germain. Ils ont la particularité d'être sous la
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forme $2q+1$, avec $q$ premier. Ainsi, l'odre de
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$\mathbb{Z}_{p}^{*}$ est $2q$. L'odre possible d'un
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élément ne peut être que $2$, $q$ ou $2q$. Ce qui fait peu (combien) de
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test à effectuer quand on cherche un générateur.
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Ecrire un script à l'aide de la commande `primesieve` qui donne
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tous les nombres premiers de Sophie Germain dans
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$[2^{62},2^{62}+20000]$. (il faut quelques minutes. Assurez-vous
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que votre shell permet de représenter de tels nombres. Comment ?)
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2. Ecrire les [fonctions](src/df.c) suivantes :
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```c
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typedef unsigned __int128 uint128;
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typedef unsigned long long int uint64;
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uint64 expm(uint64 m, uint64 e, uint64 n);
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// calcule m^e modulo n
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uint64 generateur(uint64 p);
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// calcule un generateur de (Zp)*
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// en supposant que p est un nombre premier
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// de Sophie Germain
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```
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Testez ([test_df.c](src/test_df.c)) avec $p = 4611686018427402023$ pour trouver un
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générateur.
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Remarque : pour la génération d'un grand nombre
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premier, utilisez le programme `primesieve` qsui se trouve dans
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```
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/export/documents/is1+2/asr
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```
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.
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After 
(image error) Size: 20 KiB |
13
td_tp/tp3/src/Makefile
Normal file
13
td_tp/tp3/src/Makefile
Normal file
@ -0,0 +1,13 @@
|
||||
all : test_df
|
||||
|
||||
./lib_tea/tea.o : ./lib_tea/tea.c
|
||||
gcc -c ./lib_tea/tea.c -o ./lib_tea/tea.o
|
||||
|
||||
df.o : df.c
|
||||
gcc -c df.c
|
||||
|
||||
test_df.o : test_df.c
|
||||
gcc -c test_df.c
|
||||
|
||||
test_df : test_df.o df.o ./lib_tea/tea.o
|
||||
gcc -o test_df df.o test_df.o ./lib_tea/tea.o
|
||||
23
td_tp/tp3/src/df.c
Normal file
23
td_tp/tp3/src/df.c
Normal file
@ -0,0 +1,23 @@
|
||||
#include "df.h"
|
||||
|
||||
uint64 expm(uint64 m, uint64 e, uint64 mod)
|
||||
{
|
||||
uint128 _r=1;
|
||||
uint128 _m=(uint128)m;
|
||||
uint128 _mod = (uint128)mod;
|
||||
|
||||
|
||||
// TODO
|
||||
|
||||
return (uint64)_r;
|
||||
}
|
||||
|
||||
uint64 generateur(uint64 p)
|
||||
{
|
||||
uint64 g=2;
|
||||
uint64 r=1;
|
||||
|
||||
// TODO
|
||||
}
|
||||
|
||||
|
||||
15
td_tp/tp3/src/df.h
Normal file
15
td_tp/tp3/src/df.h
Normal file
@ -0,0 +1,15 @@
|
||||
#ifndef _DF_H
|
||||
#define _DF_H
|
||||
|
||||
typedef unsigned __int128 uint128;
|
||||
typedef unsigned long long int uint64;
|
||||
|
||||
uint64 expm(uint64 m, uint64 e, uint64 n);
|
||||
// calcule m^e modulo n
|
||||
|
||||
uint64 generateur(uint64 p);
|
||||
// calcule un generateur de (Zp)*
|
||||
// en supposant que p est un nombre premier
|
||||
// de Sophie Germain
|
||||
|
||||
#endif
|
||||
39
td_tp/tp3/src/lib_tea/tea.c
Normal file
39
td_tp/tp3/src/lib_tea/tea.c
Normal file
@ -0,0 +1,39 @@
|
||||
#include "tea.h"
|
||||
#include<string.h>
|
||||
#define TOUR 32
|
||||
|
||||
void encrypt_tea (uint32_t * v, uint32_t* k)
|
||||
{
|
||||
uint32_t v0=v[0], v1=v[1], sum=0, i; /* initialisation */
|
||||
uint32_t delta=0x9e3779b9; /* constantes de clef */
|
||||
uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* mise en cache de la clef */
|
||||
for (i=0; i < TOUR; i++) { /* boucle principale */
|
||||
sum += delta;
|
||||
v0 += ((v1<<4) + k0) ^ (v1 + sum) ^ ((v1>>5) + k1);
|
||||
v1 += ((v0<<4) + k2) ^ (v0 + sum) ^ ((v0>>5) + k3);
|
||||
}
|
||||
v[0]=v0; v[1]=v1;
|
||||
}
|
||||
|
||||
void decrypt_tea (uint32_t* v, uint32_t* k)
|
||||
{
|
||||
uint32_t v0=v[0], v1=v[1], sum=0xC6EF3720, i; /* initialisation */
|
||||
uint32_t delta=0x9e3779b9; /* constantes de clefs */
|
||||
uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* mise en cache de la clef */
|
||||
for (i=0; i<TOUR; i++) { /* boucle principale */
|
||||
v1 -= ((v0<<4) + k2) ^ (v0 + sum) ^ ((v0>>5) + k3);
|
||||
v0 -= ((v1<<4) + k0) ^ (v1 + sum) ^ ((v1>>5) + k1);
|
||||
sum -= delta;
|
||||
}
|
||||
v[0]=v0; v[1]=v1;
|
||||
}
|
||||
|
||||
uint64_t hash_block_tea(char b[24])
|
||||
{
|
||||
uint32_t v[2];
|
||||
uint32_t k[4];
|
||||
memcpy(v,b,2*sizeof(uint32_t));
|
||||
memcpy(k,b+2*sizeof(uint32_t),4*sizeof(uint32_t));
|
||||
encrypt_tea(v,k);
|
||||
return ((uint64_t)v[0])<<32 | v[1];
|
||||
}
|
||||
8
td_tp/tp3/src/lib_tea/tea.h
Normal file
8
td_tp/tp3/src/lib_tea/tea.h
Normal file
@ -0,0 +1,8 @@
|
||||
#ifndef _TEA_H
|
||||
#define _TEA_H
|
||||
#include <stdint.h>
|
||||
void encrypt_tea (uint32_t* v, uint32_t* k);
|
||||
void decrypt_tea (uint32_t* v, uint32_t* k);
|
||||
uint64_t hash_block_tea(char b[24]);
|
||||
#endif
|
||||
|
||||
34
td_tp/tp3/src/lib_tea/xtea.c
Normal file
34
td_tp/tp3/src/lib_tea/xtea.c
Normal file
@ -0,0 +1,34 @@
|
||||
#include "xtea.h"
|
||||
#include<string.h>
|
||||
#define TOUR 32
|
||||
|
||||
void encrypt_xtea(uint32_t v[2], uint32_t const key[4]) {
|
||||
unsigned int i;
|
||||
uint32_t v0=v[0], v1=v[1], sum=0, delta=0x9E3779B9;
|
||||
for (i=0; i < TOUR; i++) {
|
||||
v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]);
|
||||
sum += delta;
|
||||
v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + key[(sum>>11) & 3]);
|
||||
}
|
||||
v[0]=v0; v[1]=v1;
|
||||
}
|
||||
void decrypt_xtea(uint32_t v[2], uint32_t const key[4]) {
|
||||
unsigned int i;
|
||||
uint32_t v0=v[0], v1=v[1], delta=0x9E3779B9, sum=delta*TOUR;
|
||||
for (i=0; i < TOUR; i++) {
|
||||
v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + key[(sum>>11) & 3]);
|
||||
sum -= delta;
|
||||
v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + key[sum & 3]);
|
||||
}
|
||||
v[0]=v0; v[1]=v1;
|
||||
}
|
||||
uint64_t hash_block_xtea(char b[24])
|
||||
{
|
||||
uint32_t v[2];
|
||||
uint32_t k[4];
|
||||
memcpy(v,b,2*sizeof(uint32_t));
|
||||
memcpy(k,b+2*sizeof(uint32_t),4*sizeof(uint32_t));
|
||||
encrypt_xtea(v,k);
|
||||
return ((uint64_t)v[0])<<32 | v[1];
|
||||
|
||||
}
|
||||
8
td_tp/tp3/src/lib_tea/xtea.h
Normal file
8
td_tp/tp3/src/lib_tea/xtea.h
Normal file
@ -0,0 +1,8 @@
|
||||
#ifndef _TEA_H
|
||||
#define _TEA_H
|
||||
#include <stdint.h>
|
||||
void encrypt_xtea (uint32_t* v, uint32_t const k[]);
|
||||
void decrypt_xtea (uint32_t* v, uint32_t const k[]);
|
||||
uint64_t hash_block_xtea(char b[24]);
|
||||
#endif
|
||||
|
||||
13
td_tp/tp3/src/reseau/Makefile
Normal file
13
td_tp/tp3/src/reseau/Makefile
Normal file
@ -0,0 +1,13 @@
|
||||
all : clt srv
|
||||
|
||||
clt.o:clt.c
|
||||
gcc -c clt.c
|
||||
clt: clt.o
|
||||
gcc -o clt clt.o
|
||||
srv.o : srv.c
|
||||
gcc -c srv.c
|
||||
srv : srv.o
|
||||
gcc -o srv srv.c
|
||||
|
||||
|
||||
|
||||
70
td_tp/tp3/src/reseau/clt.c
Normal file
70
td_tp/tp3/src/reseau/clt.c
Normal file
@ -0,0 +1,70 @@
|
||||
#include <sys/socket.h>
|
||||
#include <netinet/in.h>
|
||||
#include <arpa/inet.h>
|
||||
|
||||
#include <netinet/tcp.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <sys/socket.h>
|
||||
#include <resolv.h>
|
||||
#include <fcntl.h>
|
||||
#include <sys/time.h>
|
||||
#include <assert.h>
|
||||
#define MAXBUFF 4096
|
||||
|
||||
int main(int argc, char * argv[]) {
|
||||
int sock, z=0, fd;
|
||||
char buff[MAXBUFF];
|
||||
struct sockaddr_in server_addr;
|
||||
int addrlen;
|
||||
|
||||
if (argc != 4) {
|
||||
printf("Usage: %s <IP-address> <port number> <file to send>\n",argv[0]);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
sock = socket(AF_INET, SOCK_STREAM, 0);
|
||||
assert(sock != -1);
|
||||
|
||||
bzero(&server_addr, sizeof(server_addr));
|
||||
server_addr.sin_family = AF_INET;
|
||||
server_addr.sin_port = htons(atoi(argv[2]));
|
||||
|
||||
assert( inet_aton(argv[1], (struct in_addr*)&server_addr.sin_addr.s_addr) != 0 );
|
||||
|
||||
addrlen = sizeof(server_addr);
|
||||
|
||||
fd = open(argv[3],O_RDONLY,0666);
|
||||
assert(fd != -1);
|
||||
|
||||
assert(connect(sock,(struct sockaddr *)&server_addr, addrlen) != -1);
|
||||
|
||||
while(1) {
|
||||
|
||||
ssize_t mbytes, nbytes;
|
||||
|
||||
nbytes=read(fd,buff,MAXBUFF);
|
||||
|
||||
if (nbytes==-1) {
|
||||
perror("read");
|
||||
exit(1);
|
||||
}
|
||||
if (nbytes==0) {
|
||||
break;
|
||||
}
|
||||
|
||||
mbytes = write(sock,buff,nbytes);
|
||||
if (mbytes == -1) {
|
||||
perror("write");
|
||||
exit(1);
|
||||
}
|
||||
z=z+mbytes;
|
||||
}
|
||||
|
||||
printf("file %s sent (%d bytes)",argv[3],z);
|
||||
|
||||
close(sock);
|
||||
exit(0);
|
||||
}
|
||||
73
td_tp/tp3/src/reseau/clt_echo.c
Normal file
73
td_tp/tp3/src/reseau/clt_echo.c
Normal file
@ -0,0 +1,73 @@
|
||||
#include <sys/socket.h>
|
||||
#include <netinet/in.h>
|
||||
#include <arpa/inet.h>
|
||||
|
||||
#include <netinet/tcp.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <sys/socket.h>
|
||||
#include <resolv.h>
|
||||
#include <fcntl.h>
|
||||
#include <sys/time.h>
|
||||
#include <assert.h>
|
||||
#define MAXBUFF 4096
|
||||
|
||||
int main(int argc, char * argv[]) {
|
||||
int sock, z=0, fd;
|
||||
char buff[MAXBUFF];
|
||||
struct sockaddr_in server_addr;
|
||||
int addrlen;
|
||||
|
||||
if (argc != 4) {
|
||||
printf("Usage: %s <IP-address> <port number> <file to send>\n",argv[0]);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
sock = socket(AF_INET, SOCK_STREAM, 0);
|
||||
assert(sock != -1);
|
||||
|
||||
bzero(&server_addr, sizeof(server_addr));
|
||||
server_addr.sin_family = AF_INET;
|
||||
server_addr.sin_port = htons(atoi(argv[2]));
|
||||
|
||||
assert( inet_aton(argv[1], (struct in_addr*)&server_addr.sin_addr.s_addr) != 0 );
|
||||
|
||||
addrlen = sizeof(server_addr);
|
||||
|
||||
//fd = open(argv[3],O_RDONLY,0666);
|
||||
//assert(fd != -1);
|
||||
|
||||
assert(connect(sock,(struct sockaddr *)&server_addr, addrlen) != -1);
|
||||
|
||||
while(1) {
|
||||
|
||||
ssize_t mbytes, nbytes;
|
||||
|
||||
nbytes=read(0,buff,MAXBUFF);
|
||||
|
||||
if (nbytes==-1) {
|
||||
perror("read");
|
||||
exit(1);
|
||||
}
|
||||
if (nbytes==0) {
|
||||
break;
|
||||
}
|
||||
|
||||
mbytes = write(sock,buff,nbytes);
|
||||
if (mbytes == -1) {
|
||||
perror("write");
|
||||
exit(1);
|
||||
}
|
||||
nbytes=read(sock,buff,MAXBUFF);
|
||||
write(1,buff,nbytes);
|
||||
|
||||
z=z+mbytes;
|
||||
}
|
||||
|
||||
printf("file %s sent (%d bytes)",argv[3],z);
|
||||
|
||||
close(sock);
|
||||
exit(0);
|
||||
}
|
||||
113
td_tp/tp3/src/reseau/srv.c
Normal file
113
td_tp/tp3/src/reseau/srv.c
Normal file
@ -0,0 +1,113 @@
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/socket.h>
|
||||
#include <resolv.h>
|
||||
#include <arpa/inet.h>
|
||||
#include <string.h>
|
||||
#include <fcntl.h>
|
||||
#include <errno.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/wait.h>
|
||||
#include <assert.h>
|
||||
#define MAXBUFF 4096
|
||||
|
||||
int handle_transferred_file(int sock,struct sockaddr_in * client_addr)
|
||||
{
|
||||
char bufname[256];
|
||||
|
||||
char buff[MAXBUFF];
|
||||
int fd;
|
||||
ssize_t nbytes,z;
|
||||
|
||||
char addr[INET_ADDRSTRLEN];
|
||||
snprintf(bufname,256,"%s.%d",inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));
|
||||
fd = open(bufname,O_WRONLY|O_CREAT|O_TRUNC,0666);
|
||||
if (fd == -1) {
|
||||
perror("open");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
while (1) {
|
||||
//bzero(buff,MAXBUFF);
|
||||
nbytes = read(sock,buff,MAXBUFF);
|
||||
if (nbytes == -1) {
|
||||
perror("read");
|
||||
exit(1);
|
||||
}
|
||||
if (nbytes==0) break;
|
||||
|
||||
write(fd,buff,nbytes);
|
||||
z=z+nbytes;
|
||||
}
|
||||
|
||||
inet_ntop(AF_INET,&(client_addr->sin_addr.s_addr),addr,INET_ADDRSTRLEN);
|
||||
printf("%d bytes recieved from %s\n", z, addr);
|
||||
shutdown(sock,SHUT_RDWR);
|
||||
close(sock);
|
||||
|
||||
exit(0);
|
||||
|
||||
}
|
||||
|
||||
int main(int argc, char * argv[])
|
||||
{
|
||||
int /* file descriptor for the tranferred file */
|
||||
listen_sock, /* socket for listenning connection */
|
||||
service_sock, /* socket for a connected client */
|
||||
nbytes, z=0;
|
||||
int yes=1;
|
||||
|
||||
struct sockaddr_in server_addr,
|
||||
client_addr;
|
||||
|
||||
int addr_len;
|
||||
|
||||
struct sigaction sa;
|
||||
|
||||
if (argc != 2) {
|
||||
printf("Usage: %s <port number>\n",argv[0]);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
sigemptyset(&sa.sa_mask);
|
||||
sa.sa_flags = SA_NOCLDWAIT;
|
||||
sa.sa_handler = SIG_DFL;
|
||||
assert (sigaction(SIGCHLD, &sa, NULL) != -1);
|
||||
|
||||
|
||||
|
||||
listen_sock = socket(AF_INET, SOCK_STREAM, 0);
|
||||
assert( listen_sock > 0);
|
||||
|
||||
assert (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) != -1);
|
||||
|
||||
|
||||
|
||||
bzero(&server_addr, sizeof(server_addr));
|
||||
server_addr.sin_family = AF_INET;
|
||||
server_addr.sin_port = htons(atoi(argv[1]));
|
||||
server_addr.sin_addr.s_addr = INADDR_ANY;
|
||||
addr_len = sizeof(server_addr);
|
||||
|
||||
assert(bind(listen_sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) != -1);
|
||||
|
||||
assert(listen(listen_sock,10) == 0);
|
||||
|
||||
|
||||
|
||||
while(1){
|
||||
|
||||
service_sock = accept(listen_sock,
|
||||
(struct sockaddr *)&client_addr ,
|
||||
&addr_len);
|
||||
|
||||
assert(service_sock >= 0);
|
||||
|
||||
pid_t p = fork();
|
||||
if (p==0){
|
||||
close(listen_sock);
|
||||
handle_transferred_file(service_sock,&client_addr);
|
||||
}
|
||||
}
|
||||
}
|
||||
113
td_tp/tp3/src/reseau/srv_echo.c
Normal file
113
td_tp/tp3/src/reseau/srv_echo.c
Normal file
@ -0,0 +1,113 @@
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/socket.h>
|
||||
#include <resolv.h>
|
||||
#include <arpa/inet.h>
|
||||
#include <string.h>
|
||||
#include <fcntl.h>
|
||||
#include <errno.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/wait.h>
|
||||
#include <assert.h>
|
||||
#define MAXBUFF 4096
|
||||
|
||||
int handle_transferred_file(int sock,struct sockaddr_in * client_addr)
|
||||
{
|
||||
char bufname[256];
|
||||
|
||||
char buff[MAXBUFF];
|
||||
int fd;
|
||||
ssize_t nbytes,z;
|
||||
|
||||
char addr[INET_ADDRSTRLEN];
|
||||
snprintf(bufname,256,"%s.%d",inet_ntoa(client_addr->sin_addr),ntohs(client_addr->sin_port));
|
||||
//fd = open(bufname,O_WRONLY|O_CREAT|O_TRUNC,0666);
|
||||
//if (fd == -1) {
|
||||
// perror("open");
|
||||
// exit(1);
|
||||
//}
|
||||
|
||||
while (1) {
|
||||
//bzero(buff,MAXBUFF);
|
||||
nbytes = read(sock,buff,MAXBUFF);
|
||||
if (nbytes == -1) {
|
||||
perror("read");
|
||||
exit(1);
|
||||
}
|
||||
if (nbytes==0) break;
|
||||
|
||||
write(sock,buff,nbytes);
|
||||
z=z+nbytes;
|
||||
}
|
||||
|
||||
inet_ntop(AF_INET,&(client_addr->sin_addr.s_addr),addr,INET_ADDRSTRLEN);
|
||||
printf("%d bytes recieved from %s\n", z, addr);
|
||||
shutdown(sock,SHUT_RDWR);
|
||||
close(sock);
|
||||
|
||||
exit(0);
|
||||
|
||||
}
|
||||
|
||||
int main(int argc, char * argv[])
|
||||
{
|
||||
int /* file descriptor for the tranferred file */
|
||||
listen_sock, /* socket for listenning connection */
|
||||
service_sock, /* socket for a connected client */
|
||||
nbytes, z=0;
|
||||
int yes=1;
|
||||
|
||||
struct sockaddr_in server_addr,
|
||||
client_addr;
|
||||
|
||||
int addr_len;
|
||||
|
||||
struct sigaction sa;
|
||||
|
||||
if (argc != 2) {
|
||||
printf("Usage: %s <port number>\n",argv[0]);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
sigemptyset(&sa.sa_mask);
|
||||
sa.sa_flags = SA_NOCLDWAIT;
|
||||
sa.sa_handler = SIG_DFL;
|
||||
assert (sigaction(SIGCHLD, &sa, NULL) != -1);
|
||||
|
||||
|
||||
|
||||
listen_sock = socket(AF_INET, SOCK_STREAM, 0);
|
||||
assert( listen_sock > 0);
|
||||
|
||||
assert (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) != -1);
|
||||
|
||||
|
||||
|
||||
bzero(&server_addr, sizeof(server_addr));
|
||||
server_addr.sin_family = AF_INET;
|
||||
server_addr.sin_port = htons(atoi(argv[1]));
|
||||
server_addr.sin_addr.s_addr = INADDR_ANY;
|
||||
addr_len = sizeof(server_addr);
|
||||
|
||||
assert(bind(listen_sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) != -1);
|
||||
|
||||
assert(listen(listen_sock,10) == 0);
|
||||
|
||||
|
||||
|
||||
while(1){
|
||||
|
||||
service_sock = accept(listen_sock,
|
||||
(struct sockaddr *)&client_addr ,
|
||||
&addr_len);
|
||||
|
||||
assert(service_sock >= 0);
|
||||
|
||||
pid_t p = fork();
|
||||
if (p==0){
|
||||
close(listen_sock);
|
||||
handle_transferred_file(service_sock,&client_addr);
|
||||
}
|
||||
}
|
||||
}
|
||||
59
td_tp/tp3/src/test_df.c
Normal file
59
td_tp/tp3/src/test_df.c
Normal file
@ -0,0 +1,59 @@
|
||||
#include "df.h"
|
||||
#include "./lib_tea/tea.h"
|
||||
|
||||
#include <stdio.h>
|
||||
#include <assert.h>
|
||||
#include <stdlib.h>
|
||||
#include <time.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <stdint.h>
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
uint64 p = 4611686018427402023,
|
||||
a,b,
|
||||
A,B,AB,BA,
|
||||
g;
|
||||
|
||||
uint32_t k[4]; // for tea
|
||||
//
|
||||
|
||||
|
||||
|
||||
g=generateur(p);
|
||||
srand(getpid()^time(NULL));
|
||||
|
||||
for (int i = 0;i < 2; i++){
|
||||
|
||||
a = 2 + rand()%(p-3);
|
||||
A=expm(g,a,p);
|
||||
|
||||
b = 2 + rand()%(p-3);
|
||||
B = expm(g,b,p);
|
||||
|
||||
|
||||
AB = expm(A,b,p);
|
||||
|
||||
BA = expm(B,a,p);
|
||||
//printf("%lx %lx %lx %lx %lx %lx\n",a,b,A,B,AB,BA);
|
||||
assert(AB == BA);
|
||||
|
||||
memcpy((void*)(k+2*i),(void*)&AB,sizeof(uint32_t)*2);
|
||||
}
|
||||
|
||||
printf("key for tea = (%x,%x,%x,%x)\n",k[0],k[1],k[2],k[3]);
|
||||
|
||||
|
||||
|
||||
while(1){
|
||||
uint32_t v[2]={0};
|
||||
ssize_t nb_read = read(0,v,sizeof(v));
|
||||
if (nb_read <= 0)
|
||||
break;
|
||||
encrypt_tea(v,k);
|
||||
decrypt_tea(v,k);
|
||||
write(1,v,sizeof(v));
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user