Replumbing: Add a mechanism to pre-populate the provider store

OpenSSL will come with a set of well known providers, some of which
need to be accessible from the start.  These are typically built in
providers, or providers that will work as fallbacks.

We do this when creating a new provider store, which means that this
will happen in every library context, regardless of if it's the global
default one, or an explicitely created one.

We keep the data about the known providers we want to make accessible
this way in crypto/provider_predefined.h, which may become generated.
For now, though, we make it simple and edited manually.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8480)

1 files changed, 18 insertions, 0 deletions

diff --git a/crypto/provider_local.h b/crypto/provider_local.h
new file mode 100644
index 0000000000..e4c649a736
--- /dev/null
+++ b/crypto/provider_local.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/core.h>
+
+struct predefined_providers_st {
+    const char *name;
+    OSSL_provider_init_fn *init;
+    unsigned int is_fallback:1;
+};
+
+extern const struct predefined_providers_st predefined_providers[];