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// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by the GPL v2 license that can
// be found in the LICENSE file.
// Defines FileHasher, a class that creates a Verity-specific file of
// per-block hashes from a given simple_file::File.
extern "C" {
#include "verity/dm-bht.h"
#include "verity/dm-bht-userspace.h"
#include "verity/simple_file/file.h"
#include "verity/include/asm/page.h"
namespace verity {
// FileHasher takes a simple_file::File object and reads in |block_size|
// bytes creating SHA-256 hashes as it goes.
// TODO(wad) allow any hashing format supported by openssl (and the kernel).
// This class may not be used by multiple threads at once.
class FileHasher {
FileHasher() : source_(NULL),
alg_(NULL) { }
// TODO(wad) add initialized_ variable to check.
virtual bool Initialize(simple_file::File *source,
simple_file::File *destination,
unsigned int blocks,
const char *alg);
virtual bool Hash();
virtual bool Store();
// Print a table to stdout which contains a dmsetup compatible format
virtual void PrintTable(bool colocated);
virtual void set_salt(const char *salt) {
dm_bht_set_salt(&tree_, salt);
salt_ = salt;
virtual const char *salt(void) { return salt_; }
static int WriteCallback(void *file,
sector_t start,
u8 *dst,
sector_t count,
struct dm_bht_entry *entry);
simple_file::File *source_;
simple_file::File *destination_;
unsigned int block_limit_;
const char *alg_;
const char *salt_;
u8 *hash_data_;
struct dm_bht tree_;
sector_t sectors_;
} // namespace verity