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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <openssl/dh.h>
#include <openssl/engine.h>
#define PRIME_LEN 64
#define GENERATOR 5
int main()
{
void printDH(char *name, DH *dh);
DH *dhAlice;
DH *dhBob;
// Final secret shared keys. should be equal :)
unsigned char *keyAlice;
unsigned char *keyBob;
int i;
int ret;
int codes = -1;
srand( (unsigned)time( NULL ) );
dhAlice = DH_new();
dhBob = DH_new();
printf("Generating DH params ... this can take a while \n");
dhAlice = DH_generate_parameters(PRIME_LEN, GENERATOR, NULL, NULL);
// Check the return value !
DH_check(dhAlice, &codes);
if( codes == DH_UNABLE_TO_CHECK_GENERATOR)
printf("DH_UNABLE_TO_CHECK_GENERATOR");
printf("Generating public & private keys ... \n");
DH_generate_key(dhAlice);
printDH("Alice", dhAlice);
//Giving p & g parameters to Bob. This exchange will be done
//through network sockets, dont know yet how.
dhBob->p = BN_new();
dhBob->g = BN_new();
BN_copy(dhBob->p, dhAlice->p);
BN_copy(dhBob->g, dhAlice->g);
// Calculing Bob's key with shared p & g parames. Check the ret value !
DH_generate_key(dhBob);
printDH("Bob", dhBob);
// Computing secret shared keys with other peers's public key
//Alice
keyAlice = malloc(DH_size(dhAlice));
DH_compute_key(keyAlice, dhBob->pub_key, dhAlice);
printf("Alice calculated: %s\n", keyAlice);
free(keyAlice);
//Bob
keyBob = malloc(DH_size(dhBob));
DH_compute_key(keyBob, dhAlice->pub_key, dhBob);
printf("Bob calculated: %s\n", keyBob);
free(keyBob);
DH_free(dhAlice);
DH_free(dhBob);
// system("openssl dhparam 64 -out dhparams.pem 2>/dev/null");
return EXIT_SUCCESS;
}
void printDH(char *name, DH *dh)
{
//char *BN_bn2dec(const BIGNUM *a);
printf("--------------\n");
printf("%s :\n", name);
printf("%i bits\n", PRIME_LEN);
printf("p: %s \n", BN_bn2hex(dh->p));
printf("g: %s \n", BN_bn2hex(dh->g));
printf("priv_key: %s \n", BN_bn2hex(dh->priv_key));
printf("pub_key: %s \n", BN_bn2hex(dh->pub_key));
printf("\n");
} |
openssl - DH_compute_key
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Envoyé par DaZumba
mais je pense que le probleme est tout bete. Si je fais un copier coller d'un code pris sur le net et essaye d'afficher le unsigned char ca marche pas non plus.
Ja galere d'ailleurs pour utiliser toutes les fonctions 
... desfois j'ai l'impression d'etre une vraie merde.
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