| // |
| // Copyright (C) 2012 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 "shill/crypto_provider.h" |
| |
| #include <utility> |
| |
| #include <base/memory/ptr_util.h> |
| #include <base/strings/string_util.h> |
| |
| #include "shill/crypto_des_cbc.h" |
| #include "shill/crypto_rot47.h" |
| #include "shill/logging.h" |
| |
| using std::string; |
| |
| namespace shill { |
| |
| const char CryptoProvider::kKeyMatterFile[] = "/var/lib/whitelist/owner.key"; |
| |
| CryptoProvider::CryptoProvider() |
| : key_matter_file_(kKeyMatterFile) {} |
| |
| void CryptoProvider::Init() { |
| cryptos_.clear(); |
| |
| // Register the crypto modules in priority order -- highest priority first. |
| auto des_cbc = base::MakeUnique<CryptoDESCBC>(); |
| if (des_cbc->LoadKeyMatter(key_matter_file_)) { |
| cryptos_.push_back(std::move(des_cbc)); |
| } |
| cryptos_.push_back(base::MakeUnique<CryptoROT47>()); |
| } |
| |
| string CryptoProvider::Encrypt(const string& plaintext) { |
| for (auto& crypto : cryptos_) { |
| string ciphertext; |
| if (crypto->Encrypt(plaintext, &ciphertext)) { |
| const string prefix = crypto->GetID() + ":"; |
| return prefix + ciphertext; |
| } |
| } |
| LOG(WARNING) << "Unable to encrypt text, returning as is."; |
| return plaintext; |
| } |
| |
| string CryptoProvider::Decrypt(const string& ciphertext) { |
| for (auto& crypto : cryptos_) { |
| const string prefix = crypto->GetID() + ":"; |
| if (base::StartsWith(ciphertext, prefix, base::CompareCase::SENSITIVE)) { |
| string to_decrypt = ciphertext; |
| to_decrypt.erase(0, prefix.size()); |
| string plaintext; |
| if (!crypto->Decrypt(to_decrypt, &plaintext)) { |
| LOG(WARNING) << "Crypto module " << crypto->GetID() |
| << " failed to decrypt."; |
| } |
| return plaintext; |
| } |
| } |
| LOG(WARNING) << "Unable to decrypt text, returning as is."; |
| return ciphertext; |
| } |
| |
| } // namespace shill |