blob: 64a88ae5b39e3e557ac684e73a1ac60dde3ddcd7 [file] [log] [blame]
// Copyright (c) 2012 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 <memory>
#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(GLib* glib)
: glib_(glib),
key_matter_file_(kKeyMatterFile) {}
void CryptoProvider::Init() {
cryptos_.clear();
// Register the crypto modules in priority order -- highest priority first.
std::unique_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 (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::StartsWithASCII(ciphertext, prefix, true)) {
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