102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/telegram/files/FileEncryptionKey.h"
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#include "td/telegram/SecureStorage.h"
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#include "td/utils/as.h"
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#include "td/utils/crypto.h"
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#include "td/utils/Random.h"
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namespace td {
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FileEncryptionKey::FileEncryptionKey(Slice key, Slice iv) : key_iv_(key.size() + iv.size(), '\0'), type_(Type::Secret) {
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if (key.size() != 32 || iv.size() != 32) {
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LOG(ERROR) << "Wrong key/iv sizes: " << key.size() << " " << iv.size();
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type_ = Type::None;
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return;
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}
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CHECK(key_iv_.size() == 64);
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MutableSlice(key_iv_).copy_from(key);
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MutableSlice(key_iv_).substr(key.size()).copy_from(iv);
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}
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FileEncryptionKey::FileEncryptionKey(const secure_storage::Secret &secret) : type_(Type::Secure) {
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key_iv_ = secret.as_slice().str();
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}
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FileEncryptionKey FileEncryptionKey::create() {
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FileEncryptionKey res;
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res.key_iv_.resize(64);
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Random::secure_bytes(res.key_iv_);
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res.type_ = Type::Secret;
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return res;
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}
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FileEncryptionKey FileEncryptionKey::create_secure_key() {
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return FileEncryptionKey(secure_storage::Secret::create_new());
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}
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const UInt256 &FileEncryptionKey::key() const {
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CHECK(is_secret());
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CHECK(key_iv_.size() == 64);
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return *reinterpret_cast<const UInt256 *>(key_iv_.data());
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}
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Slice FileEncryptionKey::key_slice() const {
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CHECK(is_secret());
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CHECK(key_iv_.size() == 64);
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return Slice(key_iv_.data(), 32);
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}
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secure_storage::Secret FileEncryptionKey::secret() const {
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CHECK(is_secure());
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return secure_storage::Secret::create(Slice(key_iv_).truncate(32)).move_as_ok();
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}
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bool FileEncryptionKey::has_value_hash() const {
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CHECK(is_secure());
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return key_iv_.size() > secure_storage::Secret::size();
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}
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void FileEncryptionKey::set_value_hash(const secure_storage::ValueHash &value_hash) {
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key_iv_.resize(secure_storage::Secret::size() + value_hash.as_slice().size());
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MutableSlice(key_iv_).remove_prefix(secure_storage::Secret::size()).copy_from(value_hash.as_slice());
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}
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secure_storage::ValueHash FileEncryptionKey::value_hash() const {
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CHECK(has_value_hash());
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return secure_storage::ValueHash::create(Slice(key_iv_).remove_prefix(secure_storage::Secret::size())).move_as_ok();
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}
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UInt256 &FileEncryptionKey::mutable_iv() {
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CHECK(is_secret());
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CHECK(key_iv_.size() == 64);
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return *reinterpret_cast<UInt256 *>(&key_iv_[0] + 32);
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}
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Slice FileEncryptionKey::iv_slice() const {
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CHECK(is_secret());
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CHECK(key_iv_.size() == 64);
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return Slice(key_iv_.data() + 32, 32);
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}
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int32 FileEncryptionKey::calc_fingerprint() const {
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CHECK(is_secret());
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char buf[16];
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md5(key_iv_, {buf, sizeof(buf)});
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return as<int32>(buf) ^ as<int32>(buf + 4);
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}
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StringBuilder &operator<<(StringBuilder &string_builder, const FileEncryptionKey &key) {
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if (key.is_secret()) {
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return string_builder << "SecretKey{" << key.size() << "}";
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}
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if (key.is_secure()) {
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return string_builder << "SecureKey{" << key.size() << "}";
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}
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return string_builder << "NoKey{}";
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}
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} // namespace td
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