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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2010 Tatsuhiro Tsujikawa
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, 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 two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. 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 here.
*/
/* copyright --> */
#ifndef D_MESSAGE_DIGEST_H
#define D_MESSAGE_DIGEST_H
#include "common.h"
#include <string>
#include "SharedHandle.h"
namespace aria2 {
class MessageDigestImpl;
class MessageDigest {
private:
SharedHandle<MessageDigestImpl> pImpl_;
MessageDigest();
// We don't implement copy ctor.
MessageDigest(const MessageDigest&);
// We don't implement assignment operator.
MessageDigest& operator=(const MessageDigest&);
public:
~MessageDigest();
// Factory functions
static SharedHandle<MessageDigest> sha1();
// Factory function which takes hashType as string. Throws
// exception if hashType is not supported.
static SharedHandle<MessageDigest> create(const std::string& hashType);
// Returns true if hashType is supported. Otherwise returns false.
static bool supports(const std::string& hashType);
// Returns string containing supported hash function textual names
// joined with ','.
static std::string getSupportedHashTypeString();
// Returns the number of bytes needed to store digest for hashType.
static size_t getDigestLength(const std::string& hashType);
// Returns true if hash type specified by lhs is stronger than the
// one specified by rhs. Returns false if at least one of lhs and
// rhs are not supported. Otherwise returns false.
static bool isStronger(const std::string& lhs, const std::string& rhs);
static bool isValidHash
(const std::string& hashType, const std::string& hexDigest);
// Returns canonical hash algorithm name of given algostring. If
// given algostring is not supported, then returns algostring
// unchanged.
static std::string getCanonicalHashType(const std::string& hashType);
size_t getDigestLength() const;
// Resets this object so that it can be reused.
void reset();
void update(const void* data, size_t length);
// Stores digest in the region pointed by md. It is caller's
// responsibility to allocate memory at least getDigestLength().
// This call can only be called once. To reuse this object, call
// reset().
void digest(unsigned char* md);
// Returns hex digest. This call can only be called once. To reuse
// this object, call reset().
std::string hexDigest();
};
} // namespace aria2
#endif // D_MESSAGE_DIGEST_H
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