77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
//
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// Copyright (C) 2012 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "shill/crypto_provider.h"
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#include <memory>
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#include <base/strings/string_util.h>
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#include "shill/crypto_des_cbc.h"
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#include "shill/crypto_rot47.h"
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#include "shill/logging.h"
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using std::string;
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namespace shill {
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const char CryptoProvider::kKeyMatterFile[] = "/var/lib/whitelist/owner.key";
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CryptoProvider::CryptoProvider()
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: key_matter_file_(kKeyMatterFile) {}
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void CryptoProvider::Init() {
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cryptos_.clear();
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// Register the crypto modules in priority order -- highest priority first.
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std::unique_ptr<CryptoDESCBC> des_cbc(new CryptoDESCBC());
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if (des_cbc->LoadKeyMatter(key_matter_file_)) {
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cryptos_.push_back(des_cbc.release());
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}
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cryptos_.push_back(new CryptoROT47());
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}
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string CryptoProvider::Encrypt(const string& plaintext) {
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for (auto crypto : cryptos_) {
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string ciphertext;
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if (crypto->Encrypt(plaintext, &ciphertext)) {
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const string prefix = crypto->GetID() + ":";
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return prefix + ciphertext;
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}
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}
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LOG(WARNING) << "Unable to encrypt text, returning as is.";
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return plaintext;
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}
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string CryptoProvider::Decrypt(const string& ciphertext) {
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for (auto crypto : cryptos_) {
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const string prefix = crypto->GetID() + ":";
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if (base::StartsWith(ciphertext, prefix, base::CompareCase::SENSITIVE)) {
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string to_decrypt = ciphertext;
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to_decrypt.erase(0, prefix.size());
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string plaintext;
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if (!crypto->Decrypt(to_decrypt, &plaintext)) {
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LOG(WARNING) << "Crypto module " << crypto->GetID()
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<< " failed to decrypt.";
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}
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return plaintext;
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}
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}
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LOG(WARNING) << "Unable to decrypt text, returning as is.";
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return ciphertext;
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}
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} // namespace shill
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