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Set metadata cipher in fstab

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Bug: 147814592
Test: Cuttlefish can use adiantum
Change-Id: I6805ae4acff4dd1ff7cecff9153dbf29e0274165
This commit is contained in:
Paul Crowley 2020-01-29 16:09:19 -08:00
parent 92a14b6b16
commit 84e84c5f33
1 changed files with 21 additions and 2 deletions
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23
MetadataCrypt.cpp
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@ -153,6 +153,22 @@ static bool get_number_of_sectors(const std::string& real_blkdev, uint64_t* nr_s
return true;
}
static std::string lookup_cipher(const std::string& cipher_name, bool is_legacy) {
if (is_legacy) {
if (cipher_name.empty() || cipher_name == "aes-256-xts") {
return "AES-256-XTS";
}
} else {
if (cipher_name.empty() || cipher_name == "aes-256-xts") {
return "aes-xts-plain64";
} else if (cipher_name == "adiantum") {
return "xchacha12,aes-adiantum-plain64";
}
}
LOG(ERROR) << "No metadata cipher named " << cipher_name << " found, is_legacy=" << is_legacy;
return "";
}
static bool create_crypto_blk_dev(const std::string& dm_name, const FstabEntry* data_rec,
const KeyBuffer& key, std::string* crypto_blkdev) {
uint64_t nr_sec;
@ -161,6 +177,9 @@ static bool create_crypto_blk_dev(const std::string& dm_name, const FstabEntry*
bool is_legacy;
if (!DmTargetDefaultKey::IsLegacy(&is_legacy)) return false;
auto cipher = lookup_cipher(data_rec->metadata_cipher, is_legacy);
if (cipher.empty()) return false;
KeyBuffer hex_key_buffer;
if (android::vold::StrToHex(key, hex_key_buffer) != android::OK) {
LOG(ERROR) << "Failed to turn key to hex";
@ -176,8 +195,8 @@ static bool create_crypto_blk_dev(const std::string& dm_name, const FstabEntry*
}
DmTable table;
table.Emplace<DmTargetDefaultKey>(0, nr_sec, is_legacy ? "AES-256-XTS" : "aes-xts-plain64",
hex_key, data_rec->blk_device, 0, is_legacy, set_dun);
table.Emplace<DmTargetDefaultKey>(0, nr_sec, cipher, hex_key, data_rec->blk_device, 0,
is_legacy, set_dun);
auto& dm = DeviceMapper::Instance();
for (int i = 0;; i++) {