#include "gost_lcl.h"
/* Implementation of CryptoPro VKO 34.10-2001/2012 algorithm */
-static int VKO_compute_key(unsigned char *shared_key,
- const EC_POINT *pub_key, const EC_KEY *priv_key,
- const unsigned char *ukm, const size_t ukm_size,
- const int vko_dgst_nid)
+int VKO_compute_key(unsigned char *shared_key,
+ const EC_POINT *pub_key, const EC_KEY *priv_key,
+ const unsigned char *ukm, const size_t ukm_size,
+ const int vko_dgst_nid)
{
unsigned char *databuf = NULL;
- BIGNUM *UKM = NULL, *p = NULL, *order = NULL, *X = NULL, *Y = NULL;
+ BIGNUM *UKM = NULL, *p = NULL, *order = NULL, *X = NULL, *Y = NULL, *cofactor = NULL;
const BIGNUM *key = EC_KEY_get0_private_key(priv_key);
EC_POINT *pnt = EC_POINT_new(EC_KEY_get0_group(priv_key));
BN_CTX *ctx = BN_CTX_new();
UKM = hashsum2bn(ukm, ukm_size);
p = BN_CTX_get(ctx);
order = BN_CTX_get(ctx);
+ cofactor = BN_CTX_get(ctx);
X = BN_CTX_get(ctx);
Y = BN_CTX_get(ctx);
EC_GROUP_get_order(EC_KEY_get0_group(priv_key), order, ctx);
+ EC_GROUP_get_cofactor(EC_KEY_get0_group(priv_key), cofactor, ctx);
+ BN_mod_mul(UKM, UKM, cofactor, order, ctx);
BN_mod_mul(p, key, UKM, order, ctx);
if (!EC_POINT_mul(EC_KEY_get0_group(priv_key), pnt, NULL, pub_key, p, ctx)) {
GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_ERROR_POINT_MUL);
EVP_PKEY *sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
if (data->shared_ukm) {
memcpy(ukm, data->shared_ukm, 8);
- } else if (out) {
-
+ } else {
if (RAND_bytes(ukm, 8) <= 0) {
GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, GOST_R_RNG_ERROR);
return 0;
sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
if (!sec_key)
{
+ sec_key = EVP_PKEY_new();
+ if (sec_key == NULL) {
+ GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE );
+ goto err;
+ }
+
if (!EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new())
|| !EVP_PKEY_copy_parameters(sec_key, pubk)
|| !gost_ec_keygen(EVP_PKEY_get0(sec_key))) {
goto err;
}
- EVP_PKEY_free(sec_key);
-
if ((*out_len = i2d_PSKeyTransport_gost(pst, out ? &out : NULL)) > 0)
ret = 1;
err:
if (key_is_ephemeral)
EVP_PKEY_free(sec_key);
+
PSKeyTransport_gost_free(pst);
OPENSSL_free(exp_buf);
return ret;