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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <array>
#include <cstddef>
#include <string>
#include "mongo/base/status_with.h"
namespace mongo {
struct BSONBinData;
class BSONObjBuilder;
/**
* Data structure with fixed sized byte array that can be used as HMAC key or result of a SHA1
* computation.
*/
class SHA1Block {
public:
static constexpr size_t kHashLength = 20;
using HashType = std::array<std::uint8_t, kHashLength>;
SHA1Block() = default;
SHA1Block(HashType rawHash);
static StatusWith<SHA1Block> fromBuffer(const uint8_t* input, size_t inputLen);
/**
* Computes a SHA-1 hash of 'input'.
*/
static SHA1Block computeHash(const uint8_t* input, size_t inputLen);
/**
* Computes a HMAC SHA-1 keyed hash of 'input' using the key 'key'
*/
static SHA1Block computeHmac(const uint8_t* key,
size_t keyLen,
const uint8_t* input,
size_t inputLen);
const uint8_t* data() const {
return _hash.data();
}
size_t size() const {
return _hash.size();
}
/**
* Make a new SHA1Block from a BSON BinData value.
*/
static StatusWith<SHA1Block> fromBinData(const BSONBinData& binData);
/**
* Append this to a builder using the given name as a BSON BinData type value.
*/
void appendAsBinData(BSONObjBuilder& builder, StringData fieldName) const;
/**
* Do a bitwise xor against another SHA1Block and replace the current contents of this block
* with the result.
*/
void xorInline(const SHA1Block& other);
std::string toString() const;
bool operator==(const SHA1Block& other) const;
bool operator!=(const SHA1Block& other) const;
private:
HashType _hash;
};
} // namespace mongo
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