#include <openssl/ssl.h>
#include <openssl/crypto.h>
#include <openssl/dh.h>
#include <openssl/bn.h>

#include <stdio.h>


char *prime1080="FBE1022E23D213E8ACFA9AE8B9DFADA3EA6B7AC7A7B7E95AB5EB2DF858921FEADE95E6AC7BE7DE6ADBAB8A783E7AF7A7FA6A2B7BEB1E72EAE2B72F9FA2BFB2A2EFBEFAC868BADB3E828FA8BADFADA3E4CC1BE7E8AFE85E9698A783EB68FA07A77AB6AD7BEB618ACF9CA2897EB28A6189EFA07AB99A8A7FA9AE299EFA7BA66DEAFEFBEFBF0B7D8B";
char *generator = "2";

int main()
{

SSL_load_error_strings();
SSL_library_init();
OpenSSL_add_all_algorithms();

DH *dhA = DH_new();
DH *dhB = DH_new();

unsigned char* keyA = NULL;
unsigned char* keyB = NULL;

BIGNUM *bn_prime1080 = BN_new();
BIGNUM *bn_generator = BN_new();
BN_init(bn_prime1080);
BN_init(bn_generator);

BN_hex2bn(&bn_prime1080, prime1080);
BN_hex2bn(&bn_generator, generator);

dhA->p = dhB->p = bn_prime1080;
dhB->g = dhB->g = bn_generator;

DH_generate_key(dhA);
DH_generate_key(dhB);

keyA = (unsigned char*)malloc(DH_size(dhA));
keyB = (unsigned char*)malloc(DH_size(dhB));

DH_compute_key(keyA,dhB->pub_key, dhA);
DH_compute_key(keyB,dhA->pub_key, dhB);

printf("key a: %s\n",keyA);
printf("key b: %s\n",keyB);


free(keyA);
free(keyB);

DH_free(dhA);
DH_free(dhB);
BN_free(bn_prime1080);
BN_free(bn_generator);
return 0;
}