Provide support for shared library

This commit adds the required wrapper to the static library to
enable dynamic loading of the provider. The build now
generates a shared library "libparsec_openssl_provider_shared.so"
which has the required symbols that enables openssl to
dynamically load the provider.

Signed-off-by: Gowtham Suresh Kumar <[email protected]>

parsec-openssl-provider-shared/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "parsec-openssl-provider-shared"
+version = "0.1.0"
+authors = ["Parsec Project Contributors"]
+description = "A parsec openssl provider dynamic library"
+license = "Apache-2.0"
+readme = "README.md"
+keywords = ["security", "service"]
+categories = ["cryptography", "hardware-support"]
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+openssl-sys = "0.9.98"
+openssl-sys2 = { path = "../openssl-sys2" }
+parsec-openssl-provider = { path ="../parsec-openssl-provider" }

parsec-openssl-provider-shared/src/lib.rs

@@ -0,0 +1,19 @@
+// Copyright 2023 Contributors to the Parsec project.
+// SPDX-License-Identifier: Apache-2.0
+
+use parsec_openssl_provider;
+
+#[allow(non_upper_case_globals)]
+#[allow(non_snake_case)]
+#[allow(dead_code)]
+#[no_mangle]
+// The function name needs to be unique for dynamic libraries as the openssl core
+// looks for OSSL_provider_init symbol while loading the provider.
+extern "C" fn OSSL_provider_init(
+    handle: *const openssl_sys2::OSSL_CORE_HANDLE,
+    in_: *const openssl_sys2::OSSL_DISPATCH,
+    out: *mut *const openssl_sys2::OSSL_DISPATCH,
+    provctx: *mut *mut std::os::raw::c_void,
+) -> ::std::os::raw::c_int {
+    parsec_openssl_provider::parsec_provider_provider_init(handle, in_, out, provctx)
+}