+/*
+ * TODO beldmit
+ 1. Checks the next three conditions fulfilling and terminates the
+ connection with fatal error if not.
+
+ o Q_eph is on the same curve as server public key;
+
+ o Q_eph is not equal to zero point;
+
+ o q * Q_eph is not equal to zero point.
+*/
+ if (data->shared_ukm == NULL && pst->ukm != NULL) {
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_SET_IV,
+ ASN1_STRING_length(pst->ukm), (void *)ASN1_STRING_get0_data(pst->ukm)) < 0) {
+ GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_UKM_NOT_SET);
+ goto err;
+ }
+ }
+
+ if (data->shared_ukm == NULL) {
+ GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_UKM_NOT_SET);
+ goto err;
+ }