int GOST_KEY_set_public_key_affine_coordinates(GOST_KEY *key, BIGNUM *x, BIGNUM *y)
{
BN_CTX *ctx = NULL;
BIGNUM *tx, *ty;
EC_POINT *point = NULL;
int ok = 0;
if (key == NULL || key->group == NULL || x == NULL || y == NULL) {
GOSTerr(GOST_F_GOST_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ctx = BN_CTX_new();
if (ctx == NULL)
goto err;
point = EC_POINT_new(key->group);
if (point == NULL)
goto err;
if ((tx = BN_CTX_get(ctx)) == NULL)
goto err;
if ((ty = BN_CTX_get(ctx)) == NULL)
goto err;
if (EC_POINT_set_affine_coordinates_GFp(key->group, point, x, y, ctx) == 0)
goto err;
if (EC_POINT_get_affine_coordinates_GFp(key->group, point, tx, ty, ctx) == 0)
goto err;
/*
* Check if retrieved coordinates match originals: if not values are
* out of range.
*/
if (BN_cmp(x, tx) != 0 || BN_cmp(y, ty) != 0) {
GOSTerr(GOST_F_GOST_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
EC_R_COORDINATES_OUT_OF_RANGE);
goto err;
}
if (GOST_KEY_set_public_key(key, point) != 0)
goto err;
if (GOST_KEY_check_key(key) == 0)
goto err;
ok = 1;
err:
BN_CTX_free(ctx);
EC_POINT_free(point);
return ok;
}
int
gost2001_compute_public(GOST_KEY *ec)
{
const EC_GROUP *group = GOST_KEY_get0_group(ec);
EC_POINT *pub_key = NULL;
const BIGNUM *priv_key = NULL;
BN_CTX *ctx = NULL;
int ok = 0;
if (group == NULL) {
GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC,
GOST_R_KEY_IS_NOT_INITIALIZED);
return 0;
}
ctx = BN_CTX_new();
if (ctx == NULL) {
GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC,
ERR_R_MALLOC_FAILURE);
return 0;
}
BN_CTX_start(ctx);
if ((priv_key = GOST_KEY_get0_private_key(ec)) == NULL)
goto err;
pub_key = EC_POINT_new(group);
if (pub_key == NULL)
goto err;
if (EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx) == 0)
goto err;
if (GOST_KEY_set_public_key(ec, pub_key) == 0)
goto err;
ok = 1;
if (ok == 0) {
err:
GOSTerr(GOST_F_GOST2001_COMPUTE_PUBLIC, ERR_R_EC_LIB);
}
EC_POINT_free(pub_key);
if (ctx != NULL) {
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
return ok;
}
