Add the internal function ossl_method_store_do_all()

It will simply call the given callback for every method found in the
given store.

Fixes #15538
Fixes #14837

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15604)

crypto/property/property.c

@@ -362,6 +362,42 @@ int ossl_method_store_remove(OSSL_METHOD_STORE *store, int nid,
     return 0;
 }
 
+static void alg_do_one(ALGORITHM *alg, IMPLEMENTATION *impl,
+                       void (*fn)(int id, void *method, void *fnarg),
+                       void *fnarg)
+{
+    fn(alg->nid, impl->method.method, fnarg);
+}
+
+struct alg_do_each_data_st {
+    void (*fn)(int id, void *method, void *fnarg);
+    void *fnarg;
+};
+
+static void alg_do_each(ossl_uintmax_t idx, ALGORITHM *alg, void *arg)
+{
+    struct alg_do_each_data_st *data = arg;
+    int i, end = sk_IMPLEMENTATION_num(alg->impls);
+
+    for (i = 0; i < end; i++) {
+        IMPLEMENTATION *impl = sk_IMPLEMENTATION_value(alg->impls, i);
+
+        alg_do_one(alg, impl, data->fn, data->fnarg);
+    }
+}
+
+void ossl_method_store_do_all(OSSL_METHOD_STORE *store,
+                              void (*fn)(int id, void *method, void *fnarg),
+                              void *fnarg)
+{
+    struct alg_do_each_data_st data;
+
+    data.fn = fn;
+    data.fnarg = fnarg;
+    if (store != NULL)
+        ossl_sa_ALGORITHM_doall_arg(store->algs, alg_do_each, &data);
+}
+
 int ossl_method_store_fetch(OSSL_METHOD_STORE *store, int nid,
                             const char *prop_query,
                             void **method)

include/internal/property.h

@@ -58,6 +58,9 @@ int ossl_method_store_add(OSSL_METHOD_STORE *store, const OSSL_PROVIDER *prov,
                           void (*method_destruct)(void *));
 int ossl_method_store_remove(OSSL_METHOD_STORE *store, int nid,
                              const void *method);
+void ossl_method_store_do_all(OSSL_METHOD_STORE *store,
+                              void (*fn)(int id, void *method, void *fnarg),
+                              void *fnarg);
 int ossl_method_store_fetch(OSSL_METHOD_STORE *store, int nid,
                             const char *prop_query, void **method);