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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 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_HELPER_H
#define D_MESSAGE_DIGEST_HELPER_H
#include "common.h"
#include <string>
#include "SharedHandle.h"
namespace aria2 {
class BinaryStream;
class MessageDigest;
class MessageDigestHelper {
private:
static SharedHandle<MessageDigest> sha1Ctx_;
MessageDigestHelper();
public:
/**
* staticSHA1DigestInit(), staticSHA1DigestFree(), staticSHA1Digest()
* use statically declared MessageDigest sha1Ctx_.
*/
/**
* Initializes sha1Ctx_
*/
static void staticSHA1DigestInit();
/**
* Frees allocated resources for sha1Ctx_
*/
static void staticSHA1DigestFree();
static std::string staticSHA1DigestHexDigest
(const SharedHandle<BinaryStream>& bs, off_t offset, uint64_t length);
/**
* ctx must be initialized or reseted before calling this function.
* Returns hex digest string, not *raw* digest
*/
static std::string hexDigest
(const SharedHandle<MessageDigest>& ctx,
const SharedHandle<BinaryStream>& bs,
off_t offset, uint64_t length);
/**
* Stores *raw* message digest into md.
* Throws exception when mdLength is less than the size of message digest.
*/
static void digest
(unsigned char* md, size_t mdLength,
const SharedHandle<MessageDigest>& ctx,
const void* data, size_t length);
};
} // namespace aria2
#endif // D_MESSAGE_DIGEST_HELPER_H
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