FsCrypt update: support fscrypt policies v1 and v2
This patchset introduces support decryption for Android 11.
In this update we deprecate ext4crypt. To specify the
policy version to use, use TW_USE_FSCRYPT_POLICY := 1 or
TW_USE_FSCRYPT_POLICY := 2. By default policy version will
be set to 2 if this variable is omitted.
Change-Id: I62a29c1bef36c259ec4b11259f71be613d20a112
diff --git a/crypto/fscrypt/CryptoType.cpp b/crypto/fscrypt/CryptoType.cpp
new file mode 100644
index 0000000..cf1ef42
--- /dev/null
+++ b/crypto/fscrypt/CryptoType.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include "CryptoType.h"
+
+#include <string.h>
+
+#include <android-base/logging.h>
+#include <cutils/properties.h>
+
+
+const CryptoType& lookup_crypto_algorithm(const CryptoType table[], int table_len,
+ const CryptoType& default_alg, const char* property) {
+ char paramstr[PROPERTY_VALUE_MAX];
+
+ property_get(property, paramstr, default_alg.get_config_name());
+ for (int i = 0; i < table_len; i++) {
+ if (strcmp(paramstr, table[i].get_config_name()) == 0) {
+ return table[i];
+ }
+ }
+ LOG(ERROR) << "Invalid name (" << paramstr << ") for " << property << ". Defaulting to "
+ << default_alg.get_config_name() << ".";
+ return default_alg;
+}