Adding DropBox logging support for keystore functionality

This will allow us to track the actual usage patterns of keystore
functions and error occurences.

Bug: 36549319
Test: DropBox logging works for keystore tags
Change-Id: Iadfba3afebaa0be753212b1111b68f50b77f9978
(cherry picked from commit d6d8952b346f08b4b74199adc1215579f4faeeff)
diff --git a/keystore/operation_proto_handler.cpp b/keystore/operation_proto_handler.cpp
new file mode 100644
index 0000000..77e1b73
--- /dev/null
+++ b/keystore/operation_proto_handler.cpp
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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.
+ */
+#define LOG_TAG "KeystoreOperation"
+
+#include "operation_proto_handler.h"
+
+#include <android/os/DropBoxManager.h>
+#include <google/protobuf/message_lite.h>
+#include <keymasterV4_0/Keymaster.h>
+#include <keystore/keymaster_types.h>
+#include <keystore/keystore_hidl_support.h>
+#include <utils/String16.h>
+
+#include "operation_config.pb.h"
+
+namespace keystore {
+
+void determinePurpose(KeyPurpose purpose, OperationConfig* operationConfig) {
+    switch (purpose) {
+    case KeyPurpose::VERIFY:
+        operationConfig->set_purpose("verify");
+        break;
+    case KeyPurpose::ENCRYPT:
+        operationConfig->set_purpose("encrypt");
+        break;
+    case KeyPurpose::SIGN:
+        operationConfig->set_purpose("sign");
+        break;
+    case KeyPurpose::DECRYPT:
+        operationConfig->set_purpose("decrypt");
+        break;
+    case KeyPurpose::WRAP_KEY:
+        operationConfig->set_purpose("wrap");
+        break;
+    default:
+        break;
+    }
+}
+
+void checkKeyCharacteristics(const hidl_vec<KeyParameter>& characteristics,
+                             OperationConfig* operationConfig) {
+    for (auto& opParam : characteristics) {
+        switch (opParam.tag) {
+        case Tag::ALGORITHM:
+            operationConfig->set_algorithm(toString(accessTagValue(TAG_ALGORITHM, opParam)));
+            break;
+        case Tag::KEY_SIZE:
+            operationConfig->set_key_size(accessTagValue(TAG_KEY_SIZE, opParam));
+            break;
+        case Tag::EC_CURVE:
+            operationConfig->set_ec_curve(toString(accessTagValue(TAG_EC_CURVE, opParam)));
+            break;
+        case Tag::AUTH_TIMEOUT:
+            operationConfig->set_user_auth_key_timeout(accessTagValue(TAG_AUTH_TIMEOUT, opParam));
+            break;
+        case Tag::ORIGIN:
+            operationConfig->set_origin(toString(accessTagValue(TAG_ORIGIN, opParam)));
+            break;
+        case Tag::BLOB_USAGE_REQUIREMENTS:
+            operationConfig->set_key_blob_usage_reqs(
+                toString(accessTagValue(TAG_BLOB_USAGE_REQUIREMENTS, opParam)));
+            break;
+        case Tag::USER_AUTH_TYPE:
+            operationConfig->set_user_auth_type(
+                toString(accessTagValue(TAG_USER_AUTH_TYPE, opParam)));
+            break;
+        default:
+            break;
+        }
+    }
+}
+
+void checkOpCharacteristics(const hidl_vec<KeyParameter>& characteristics,
+                            OperationConfig* operationConfig) {
+    for (auto& opParam : characteristics) {
+        switch (opParam.tag) {
+        case Tag::BLOCK_MODE:
+            operationConfig->set_block_mode(toString(accessTagValue(TAG_BLOCK_MODE, opParam)));
+            break;
+        case Tag::PADDING:
+            operationConfig->set_padding(toString(accessTagValue(TAG_PADDING, opParam)));
+            break;
+        case Tag::DIGEST:
+            operationConfig->set_digest(toString(accessTagValue(TAG_DIGEST, opParam)));
+            break;
+        default:
+            break;
+        }
+    }
+}
+
+void uploadOpAsProto(Operation& op, bool wasOpSuccessful) {
+    OperationConfig operationConfig;
+    determinePurpose(op.purpose, &operationConfig);
+    checkKeyCharacteristics(op.characteristics.softwareEnforced, &operationConfig);
+    checkKeyCharacteristics(op.characteristics.hardwareEnforced, &operationConfig);
+    checkOpCharacteristics(op.params, &operationConfig);
+    auto dropbox = std::make_unique<android::os::DropBoxManager>();
+    operationConfig.set_was_op_successful(wasOpSuccessful);
+
+    size_t size = operationConfig.ByteSize();
+    auto data = std::make_unique<uint8_t[]>(size);
+    operationConfig.SerializeWithCachedSizesToArray(data.get());
+    dropbox->addData(android::String16("keymaster"), data.get(), size, 0);
+}
+
+}  // namespace keystore