Hi All,
I have few queries on how to implement custom engine ECDH ec set_group method and it's return value. Any inputs are highly appreciated.
While setting engine group,currently always default group is set.
int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
{
if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0) #Const object & pass by value,whatever the value set by custom engine is not reflected in the group object
return 0;
EC_GROUP_free(key->group);#Freeing the key->group.
key->group = EC_GROUP_dup(group); #Assigning the same group object
return (key->group == NULL) ? 0 : 1;
}
Below is my engine set_group code.
int my_engine_set_group(EC_KEY *key, const EC_GROUP *grp)
{
if(grp->curve_name==P256)
key->group = get_custom_group();
#What should be the return value for supported and non supported curves ?
return 1;
else #Other curves such as P384,P521
return 0;
}
Regards
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