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/*
* Copyright 2014 Andrew Ayer
*
* This file is part of git-crypt.
*
* git-crypt is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* git-crypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with git-crypt. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify the Program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the licensors of the Program
* grant you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#ifndef GIT_CRYPT_KEY_HPP
#define GIT_CRYPT_KEY_HPP
#include <map>
#include <functional>
#include <stdint.h>
#include <iosfwd>
#include <string>
enum {
HMAC_KEY_LEN = 64,
AES_KEY_LEN = 32
};
struct Key_file {
public:
struct Entry {
uint32_t version;
unsigned char aes_key[AES_KEY_LEN];
unsigned char hmac_key[HMAC_KEY_LEN];
Entry ();
void load (std::istream&);
void load_legacy (uint32_t version, std::istream&);
void store (std::ostream&) const;
void generate (uint32_t version);
};
struct Malformed { }; // exception class
struct Incompatible { }; // exception class
const Entry* get_latest () const;
const Entry* get (uint32_t version) const;
void add (const Entry&);
void load_legacy (std::istream&);
void load (std::istream&);
void store (std::ostream&) const;
bool load_from_file (const char* filename);
bool store_to_file (const char* filename) const;
std::string store_to_string () const;
void generate ();
bool is_empty () const { return entries.empty(); }
bool is_filled () const { return !is_empty(); }
uint32_t latest () const;
void set_key_name (const char* k) { key_name = k ? k : ""; }
const char* get_key_name () const { return key_name.empty() ? 0 : key_name.c_str(); }
private:
typedef std::map<uint32_t, Entry, std::greater<uint32_t> > Map;
enum { FORMAT_VERSION = 2 };
Map entries;
std::string key_name;
void load_header (std::istream&);
enum {
HEADER_FIELD_END = 0,
HEADER_FIELD_KEY_NAME = 1
};
enum {
KEY_FIELD_END = 0,
KEY_FIELD_VERSION = 1,
KEY_FIELD_AES_KEY = 3,
KEY_FIELD_HMAC_KEY = 5
};
enum {
MAX_FIELD_LEN = 1<<20
};
};
enum {
KEY_NAME_MAX_LEN = 128
};
bool validate_key_name (const char* key_name, std::string* reason =0);
#endif
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