X-Git-Url: http://wagner.pp.ru/gitweb/?a=blobdiff_plain;f=gost_ec_keyx.c;h=06835d37b250287228d1b127469790e8b8f11159;hb=a0d13491d28ee12e1c5517a0684a571be96fc7a5;hp=eeb0122960594d01634123ebf7c51e7418f04187;hpb=e1afd2a137a0a4cab89260202fdc1828263d098d;p=openssl-gost%2Fengine.git

diff --git a/gost_ec_keyx.c b/gost_ec_keyx.c
index eeb0122..06835d3 100644
--- a/gost_ec_keyx.c
+++ b/gost_ec_keyx.c
@@ -62,7 +62,12 @@ int VKO_compute_key(unsigned char *shared_key,
                        EC_GROUP_get0_order(grp), ctx))
         goto err;
 
-    /* these two curves have cofactor 4; the rest have cofactor 1 */
+#if 0
+    /*-
+     * These two curves have cofactor 4; the rest have cofactor 1.
+     * But currently gost_ec_point_mul takes care of the cofactor clearing,
+     * hence this code is not needed.
+     */
     switch (EC_GROUP_get_curve_name(grp)) {
         case NID_id_tc26_gost_3410_2012_256_paramSetA:
         case NID_id_tc26_gost_3410_2012_512_paramSetC:
@@ -70,6 +75,7 @@ int VKO_compute_key(unsigned char *shared_key,
                 goto err;
             break;
     }
+#endif
 
     if (!gost_ec_point_mul(grp, pnt, NULL, pub_key, scalar, ctx)) {
         GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_ERROR_POINT_MUL);
@@ -672,6 +678,13 @@ static int pkey_gost2018_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
 
    o  q * Q_eph is not equal to zero point.
 */
+    if (eph_key == NULL || priv == NULL || data == NULL) {
+       GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
+               GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
+       ret = 0;
+       goto err;
+    }
+  
     if (data->shared_ukm_size == 0 && 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) {