Add a "config_util" class with a method "CreateTinkKeyTypeEntry"

I plan to remove the catalogue (in upcoming changes). For this, I need to untangle some of the dependencies, and this is easiest if I add a new BUILD target which only creates a Tink Key Type.

PiperOrigin-RevId: 260116920

cc/config/BUILD.bazel

@@ -21,6 +21,17 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "config_util",
+    srcs = ["config_util.cc"],
+    hdrs = ["config_util.h"],
+    include_prefix = "tink",
+    strip_include_prefix = "/cc",
+    deps = [
+        "//proto:config_cc_proto",
+    ],
+)
+
 # tests
 
 cc_test(
@@ -43,3 +54,13 @@ cc_test(
         "@com_google_googletest//:gtest_main",
     ],
 )
+
+cc_test(
+    name = "config_util_test",
+    size = "small",
+    srcs = ["config_util_test.cc"],
+    deps = [
+        ":config_util",
+        "@com_google_googletest//:gtest_main",
+    ],
+)

cc/config/CMakeLists.txt

@@ -16,6 +16,15 @@ tink_cc_library(
     tink::proto::config_cc_proto
 )
 
+tink_cc_library(
+  NAME config_util
+  SRCS
+    config_util.cc
+    config_util.h
+  DEPS
+    tink::proto::config_cc_proto
+)
+
 # tests
 
 tink_cc_test(
@@ -34,3 +43,11 @@ tink_cc_test(
     tink::core::streaming_aead
     tink::util::status
 )
+
+tink_cc_test(
+  NAME config_util_test
+  SRCS config_util_test.cc
+  DEPS
+    tink::config::config_util
+    gmock
+)

cc/config/config_util.cc

+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include "tink/config/config_util.h"
+
+namespace crypto {
+namespace tink {
+
+google::crypto::tink::KeyTypeEntry CreateTinkKeyTypeEntry(
+    const std::string& catalogue_name, const std::string& primitive_name,
+    const std::string& key_proto_name, int key_manager_version,
+    bool new_key_allowed) {
+  std::string prefix = "type.googleapis.com/google.crypto.tink.";
+  google::crypto::tink::KeyTypeEntry entry;
+  entry.set_catalogue_name(catalogue_name);
+  entry.set_primitive_name(primitive_name);
+  entry.set_type_url(prefix.append(key_proto_name));
+  entry.set_key_manager_version(key_manager_version);
+  entry.set_new_key_allowed(new_key_allowed);
+  return entry;
+}
+
+}  // namespace tink
+}  // namespace crypto

cc/config/config_util.h

+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef TINK_CONFIG_CONFIG_UTIL_H_
+#define TINK_CONFIG_CONFIG_UTIL_H_
+
+#include "proto/config.pb.h"
+
+namespace crypto {
+namespace tink {
+
+google::crypto::tink::KeyTypeEntry CreateTinkKeyTypeEntry(
+    const std::string& catalogue_name, const std::string& primitive_name,
+    const std::string& key_proto_name, int key_manager_version,
+    bool new_key_allowed);
+
+}  // namespace tink
+}  // namespace crypto
+
+#endif  // TINK_CONFIG_CONFIG_UTIL_H_

cc/config/config_util_test.cc

+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include "tink/config/config_util.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+using ::testing::Eq;
+
+namespace crypto {
+namespace tink {
+
+TEST(CreateKeyTypeEntry, Simple) {
+  google::crypto::tink::KeyTypeEntry entry = CreateTinkKeyTypeEntry(
+      "catalogue", "primitive_name", "key_proto_name", 12, true);
+  EXPECT_THAT(entry.catalogue_name(), Eq("catalogue"));
+}
+
+}  // namespace tink
+}  // namespace crypto