| // Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "shill/crypto_provider.h" |
| |
| #include <base/logging.h> |
| #include <base/memory/scoped_ptr.h> |
| #include <base/string_util.h> |
| |
| #include "shill/crypto_des_cbc.h" |
| #include "shill/crypto_rot47.h" |
| |
| using std::string; |
| |
| namespace shill { |
| |
| const char CryptoProvider::kKeyMatterFile[] = "/var/lib/whitelist/owner.key"; |
| |
| CryptoProvider::CryptoProvider(GLib *glib) |
| : glib_(glib), |
| key_matter_file_(kKeyMatterFile) {} |
| |
| void CryptoProvider::Init() { |
| cryptos_.reset(); |
| |
| // Register the crypto modules in priority order -- highest priority first. |
| scoped_ptr<CryptoDESCBC> des_cbc(new CryptoDESCBC(glib_)); |
| if (des_cbc->LoadKeyMatter(key_matter_file_)) { |
| cryptos_.push_back(des_cbc.release()); |
| } |
| cryptos_.push_back(new CryptoROT47()); |
| } |
| |
| string CryptoProvider::Encrypt(const string &plaintext) { |
| for (Cryptos::iterator it = cryptos_.begin(); it != cryptos_.end(); ++it) { |
| CryptoInterface *crypto = *it; |
| 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 (Cryptos::iterator it = cryptos_.begin(); it != cryptos_.end(); ++it) { |
| CryptoInterface *crypto = *it; |
| const string prefix = crypto->GetID() + ":"; |
| if (StartsWithASCII(ciphertext, prefix, true)) { |
| string to_decrypt = ciphertext; |
| to_decrypt.erase(0, prefix.size()); |
| string plaintext; |
| LOG_IF(WARNING, !crypto->Decrypt(to_decrypt, &plaintext)) |
| << "Crypto module " << crypto->GetID() << " failed to decrypt."; |
| return plaintext; |
| } |
| } |
| LOG(WARNING) << "Unable to decrypt text, returning as is."; |
| return ciphertext; |
| } |
| |
| } // namespace shill |