From fefe5915b06a1121d885fba3680dd1b90027fd5d Mon Sep 17 00:00:00 2001
From: Ethan Yonker <dees_troy@teamw.in>
Date: Sat, 30 Sep 2017 22:22:13 -0500
Subject: FBE for Pixel 2

Includes various minor fixes for building in Android 8 trees with r23+ tag

Update FBE extended header in libtar to version 2 and include the entire
ext4_encryption_policy structure now after translating the policy.

See this post for more details:
https://plus.google.com/u/1/+DeesTroy/posts/i33ygUi7tiu

Change-Id: I2af981e51f459b17fcd895fb8c2d3f6c8200e24b
---
 crypto/ext4crypt/Weaver1.cpp | 128 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 crypto/ext4crypt/Weaver1.cpp

(limited to 'crypto/ext4crypt/Weaver1.cpp')

diff --git a/crypto/ext4crypt/Weaver1.cpp b/crypto/ext4crypt/Weaver1.cpp
new file mode 100644
index 000000000..6d09ec995
--- /dev/null
+++ b/crypto/ext4crypt/Weaver1.cpp
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2017 Team Win Recovery 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.
+ */
+
+/* To the best of my knowledge there is no native implementation for
+ * Weaver so I made this by looking at the IWeaver.h file that gets
+ * compiled by the build system. I took the information from this header
+ * file and looked at keymaster source to get an idea of the proper way
+ * to write the functions.
+ */
+
+#include "Weaver1.h"
+
+//#include <android-base/logging.h>
+#include <keystore/keymaster_tags.h>
+#include <keystore/authorization_set.h>
+#include <keystore/keystore_hidl_support.h>
+
+#include <android/hardware/weaver/1.0/IWeaver.h>
+
+#include <iostream>
+#define ERROR 1
+#define LOG(x) std::cout
+
+using namespace android::hardware::weaver;
+using android::hardware::hidl_string;
+using ::android::hardware::weaver::V1_0::IWeaver;
+using ::android::hardware::weaver::V1_0::WeaverConfig;
+using ::android::hardware::weaver::V1_0::WeaverReadStatus;
+using ::android::hardware::weaver::V1_0::WeaverReadResponse;
+using ::android::hardware::weaver::V1_0::WeaverStatus;
+using ::android::hardware::Return;
+using ::android::sp;
+
+namespace android {
+namespace vold {
+
+Weaver::Weaver() {
+	mDevice = ::android::hardware::weaver::V1_0::IWeaver::getService();
+	GottenConfig = false;
+}
+
+bool Weaver::GetConfig() {
+	if (GottenConfig)
+		return true;
+
+	WeaverStatus status;
+	WeaverConfig cfg;
+
+	bool callbackCalled = false;
+	auto ret = mDevice->getConfig([&](WeaverStatus s, WeaverConfig c) {
+		callbackCalled = true;
+		status = s;
+		cfg = c;
+	});
+	if (ret.isOk() && callbackCalled && status == WeaverStatus::OK) {
+		config = cfg;
+		GottenConfig = true;
+		return true;
+	}
+	return false;
+}
+
+bool Weaver::GetSlots(uint32_t* slots) {
+	if (!GetConfig())
+		return false;
+	*slots = config.slots;
+	return true;
+}
+
+bool Weaver::GetKeySize(uint32_t* keySize) {
+	if (!GetConfig())
+		return false;
+	*keySize = config.keySize;
+	return true;
+}
+
+bool Weaver::GetValueSize(uint32_t* valueSize) {
+	if (!GetConfig())
+		return false;
+	*valueSize = config.valueSize;
+	return true;
+}
+
+// TODO: we should return more information about the status including time delays before the next retry
+bool Weaver::WeaverVerify(const uint32_t slot, const void* weaver_key, std::vector<uint8_t>* payload) {
+	bool callbackCalled = false;
+	WeaverReadStatus status;
+	std::vector<uint8_t> readValue;
+	uint32_t timeout;
+	uint32_t keySize;
+	if (!GetKeySize(&keySize))
+		return false;
+	std::vector<uint8_t> key;
+	key.resize(keySize);
+	uint32_t index = 0;
+	unsigned char* ptr = (unsigned char*)weaver_key;
+	for (index = 0; index < keySize; index++) {
+		key[index] = *ptr;
+		ptr++;
+	}
+	const auto readRet = mDevice->read(slot, key, [&](WeaverReadStatus s, WeaverReadResponse r) {
+		callbackCalled = true;
+		status = s;
+		readValue = r.value;
+		timeout = r.timeout;
+	});
+	if (readRet.isOk() && callbackCalled && status == WeaverReadStatus::OK && timeout == 0) {
+		*payload = readValue;
+		return true;
+	}
+	return false;
+}
+
+}  // namespace vold
+}  // namespace android
-- 
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