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Merge "Make CTS not HEH the default post Q"

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Treehugger Robot 2020-02-19 23:04:37 +00:00 committed by Gerrit Code Review
commit 39969f0288
1 changed files with 10 additions and 5 deletions
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15
FsCrypt.cpp
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@ -231,13 +231,18 @@ static bool install_storage_key(const std::string& mountpoint, const EncryptionO
// Retrieve the options to use for encryption policies on adoptable storage.
static bool get_volume_file_encryption_options(EncryptionOptions* options) {
auto contents_mode =
android::base::GetProperty("ro.crypto.volume.contents_mode", "aes-256-xts");
// If we give the empty string, libfscrypt will use the default (currently XTS)
auto contents_mode = android::base::GetProperty("ro.crypto.volume.contents_mode", "");
// HEH as default was always a mistake. Use the libfscrypt default (CTS)
// for devices launching on versions above Android 10.
auto first_api_level = GetFirstApiLevel();
constexpr uint64_t pre_gki_level = 29;
auto filenames_mode =
android::base::GetProperty("ro.crypto.volume.filenames_mode", "aes-256-heh");
android::base::GetProperty("ro.crypto.volume.filenames_mode",
first_api_level > pre_gki_level ? "" : "aes-256-heh");
auto options_string = android::base::GetProperty("ro.crypto.volume.options",
contents_mode + ":" + filenames_mode + ":v1");
if (!ParseOptions(options_string, options)) {
contents_mode + ":" + filenames_mode);
if (!ParseOptionsForApiLevel(first_api_level, options_string, options)) {
LOG(ERROR) << "Unable to parse volume encryption options: " << options_string;
return false;
}