tr_dh_secret_t
tr_dh_agree (tr_dh_ctx_t handle,
const uint8_t * other_public_key,
size_t other_public_key_length)
{
struct tr_dh_secret * ret;
int dh_size, secret_key_length;
BIGNUM * other_key;
assert (handle != NULL);
assert (other_public_key != NULL);
if (!check_pointer (other_key = BN_bin2bn (other_public_key, other_public_key_length, NULL)))
return NULL;
dh_size = DH_size (handle);
ret = tr_dh_secret_new (dh_size);
secret_key_length = DH_compute_key (ret->key, other_key, handle);
if (check_result_neq (secret_key_length, -1))
{
tr_dh_secret_align (ret, secret_key_length);
}
else
{
tr_dh_secret_free (ret);
ret = NULL;
}
BN_free (other_key);
return ret;
}
tr_dh_secret_t
tr_dh_agree (tr_dh_ctx_t raw_handle,
const uint8_t * other_public_key,
size_t other_public_key_length)
{
struct tr_dh_ctx * handle = raw_handle;
struct tr_dh_secret * ret;
word32 my_secret_key_length;
assert (handle != NULL);
assert (other_public_key != NULL);
ret = tr_dh_secret_new (handle->key_length);
if (check_result (DhAgree (&handle->dh,
ret->key, &my_secret_key_length,
handle->private_key, handle->private_key_length,
other_public_key, other_public_key_length)))
{
tr_dh_secret_align (ret, my_secret_key_length);
}
else
{
tr_dh_secret_free (ret);
ret = NULL;
}
return ret;
}