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//
// SHA1Engine.h
//
// Library: Foundation
// Package: Crypt
// Module: SHA1Engine
//
// Definition of class SHA1Engine.
//
// Secure Hash Standard SHA-1 algorithm
// (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm)
//
// Based on the public domain implementation by Peter C. Gutmann
// on 2 Sep 1992, modified by Carl Ellison to be SHA-1.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_SHA1Engine_INCLUDED
#define Foundation_SHA1Engine_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/DigestEngine.h"
namespace Poco {
class Foundation_API SHA1Engine: public DigestEngine
/// This class implementes the SHA-1 message digest algorithm.
/// (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm)
{
public:
enum
{
BLOCK_SIZE = 64,
DIGEST_SIZE = 20
};
SHA1Engine();
~SHA1Engine();
std::size_t digestLength() const;
void reset();
const DigestEngine::Digest& digest();
protected:
void updateImpl(const void* data, std::size_t length);
private:
void transform();
static void byteReverse(UInt32* buffer, int byteCount);
typedef UInt8 BYTE;
struct Context
{
UInt32 digest[5]; // Message digest
UInt32 countLo; // 64-bit bit count
UInt32 countHi;
UInt32 data[16]; // SHA data buffer
UInt32 slop; // # of bytes saved in data[]
};
Context _context;
DigestEngine::Digest _digest;
SHA1Engine(const SHA1Engine&);
SHA1Engine& operator = (const SHA1Engine&);
};
} // namespace Poco
#endif // Foundation_SHA1Engine_INCLUDED
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