EVP: add name traversal functions to all fetchable types

The following new functions all do the same thing; they traverse
the set of names assigned to implementations of each algorithm type:

EVP_MD_names_do_all(), EVP_CIPHER_names_do_all(),
EVP_MAC_names_do_all(), EVP_KEYMGMT_names_do_all(),
EVP_KEYEXCH_names_do_all(), EVP_KDF_names_do_all(),
EVP_SIGNATURE_names_do_all()

We add a warning to the documentation of EVP_CIPHER_name() and
EVP_MD_name(), as they aren't suitable to use with multiple-name
implementation.

We also remove EVP_MAC_name() and evp_KDF_name(), as they serve no
useful purpose.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/9979)

1 files changed, 8 insertions, 0 deletions

diff --git a/crypto/evp/keymgmt_meth.c b/crypto/evp/keymgmt_meth.c
index 990f899159..6a1c15ae24 100644
--- a/crypto/evp/keymgmt_meth.c
+++ b/crypto/evp/keymgmt_meth.c
@@ -214,3 +214,11 @@ void EVP_KEYMGMT_do_all_provided(OPENSSL_CTX *libctx,
                        keymgmt_from_dispatch, NULL,
                        (void (*)(void *))EVP_KEYMGMT_free);
 }
+
+void EVP_KEYMGMT_names_do_all(const EVP_KEYMGMT *keymgmt,
+                              void (*fn)(const char *name, void *data),
+                              void *data)
+{
+    if (keymgmt->prov != NULL)
+        evp_names_do_all(keymgmt->prov, keymgmt->name_id, fn, data);
+}