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// Copyright (c) 2013 The Chromium 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 "chrome/browser/managed_mode/managed_user_passphrase.h"
#include "base/base64.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "crypto/encryptor.h"
#include "crypto/random.h"
#include "crypto/symmetric_key.h"
namespace {
// These constants are used as parameters when calling |DeriveKeyFromPassword|.
const int kNumberOfIterations = 1;
const int kDerivedKeySize = 128;
const int kSaltSize = 32;
} // namespace
ManagedUserPassphrase::ManagedUserPassphrase(const std::string& salt)
: salt_(salt) {
if (salt_.empty())
GenerateRandomSalt();
}
ManagedUserPassphrase::~ManagedUserPassphrase() {
}
std::string ManagedUserPassphrase::GetSalt() {
return salt_;
}
void ManagedUserPassphrase::GenerateRandomSalt() {
std::string bytes;
crypto::RandBytes(WriteInto(&bytes, kSaltSize+1), kSaltSize);
bool success = base::Base64Encode(bytes, &salt_);
DCHECK(success);
}
bool ManagedUserPassphrase::GenerateHashFromPassphrase(
const std::string& passphrase,
std::string* encoded_passphrase_hash) const {
std::string passphrase_hash;
if (!GetPassphraseHash(passphrase, &passphrase_hash))
return false;
return base::Base64Encode(passphrase_hash, encoded_passphrase_hash);
}
bool ManagedUserPassphrase::GetPassphraseHash(
const std::string& passphrase,
std::string* passphrase_hash) const {
DCHECK(passphrase_hash);
// Create a hash from the user-provided passphrase and the randomly generated
// (or provided) salt.
scoped_ptr<crypto::SymmetricKey> encryption_key(
crypto::SymmetricKey::DeriveKeyFromPassword(
crypto::SymmetricKey::AES,
passphrase,
salt_,
kNumberOfIterations,
kDerivedKeySize));
return encryption_key->GetRawKey(passphrase_hash);
}
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