blob: 1ca4b04220d66408751c26d4872ca14f18db301d [file] [log] [blame]
// 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