OPENSSL_STACK *OPENSSL_sk_deep_copy(OPENSSL_STACK *, OPENSSL_sk_copyfunc c, OPENSSL_sk_freefunc f);
int OPENSSL_sk_insert(OPENSSL_STACK *sk, void *data, int where);
void *OPENSSL_sk_delete(OPENSSL_STACK *st, int loc);
-void *OPENSSL_sk_delete_ptr(OPENSSL_STACK *st, void *p);
-int OPENSSL_sk_find(OPENSSL_STACK *st, void *data);
-int OPENSSL_sk_find_ex(OPENSSL_STACK *st, void *data);
+void *OPENSSL_sk_delete_ptr(OPENSSL_STACK *st, const void *p);
+int OPENSSL_sk_find(OPENSSL_STACK *st, const void *data);
+int OPENSSL_sk_find_ex(OPENSSL_STACK *st, const void *data);
int OPENSSL_sk_push(OPENSSL_STACK *st, void *data);
int OPENSSL_sk_unshift(OPENSSL_STACK *st, void *data);
void *OPENSSL_sk_shift(OPENSSL_STACK *st);