/usr/include/Poco/HMACEngine.h is in libpoco-dev 1.8.0.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | //
// HMACEngine.h
//
// Library: Foundation
// Package: Crypt
// Module: HMACEngine
//
// Definition of the HMACEngine class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_HMACEngine_INCLUDED
#define Foundation_HMACEngine_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/DigestEngine.h"
#include <cstring>
namespace Poco {
template <class Engine>
class HMACEngine: public DigestEngine
/// This class implementes the HMAC message
/// authentication code algorithm, as specified
/// in RFC 2104. The underlying DigestEngine
/// (MD5Engine, SHA1Engine, etc.) must be given as
/// template argument.
/// Since the HMACEngine is a DigestEngine, it can
/// be used with the DigestStream class to create
/// a HMAC for a stream.
{
public:
enum
{
BLOCK_SIZE = Engine::BLOCK_SIZE,
DIGEST_SIZE = Engine::DIGEST_SIZE
};
HMACEngine(const std::string& passphrase)
{
init(passphrase.data(), passphrase.length());
}
HMACEngine(const char* passphrase, std::size_t length)
{
poco_check_ptr (passphrase);
init(passphrase, length);
}
~HMACEngine()
{
std::memset(_ipad, 0, BLOCK_SIZE);
std::memset(_opad, 0, BLOCK_SIZE);
delete [] _ipad;
delete [] _opad;
}
std::size_t digestLength() const
{
return DIGEST_SIZE;
}
void reset()
{
_engine.reset();
_engine.update(_ipad, BLOCK_SIZE);
}
const DigestEngine::Digest& digest()
{
const DigestEngine::Digest& d = _engine.digest();
char db[DIGEST_SIZE];
char* pdb = db;
for (DigestEngine::Digest::const_iterator it = d.begin(); it != d.end(); ++it)
*pdb++ = *it;
_engine.reset();
_engine.update(_opad, BLOCK_SIZE);
_engine.update(db, DIGEST_SIZE);
const DigestEngine::Digest& result = _engine.digest();
reset();
return result;
}
protected:
void init(const char* passphrase, std::size_t length)
{
_ipad = new char[BLOCK_SIZE];
_opad = new char[BLOCK_SIZE];
std::memset(_ipad, 0, BLOCK_SIZE);
std::memset(_opad, 0, BLOCK_SIZE);
if (length > BLOCK_SIZE)
{
_engine.reset();
_engine.update(passphrase, length);
const DigestEngine::Digest& d = _engine.digest();
char* ipad = _ipad;
char* opad = _opad;
int n = BLOCK_SIZE;
for (DigestEngine::Digest::const_iterator it = d.begin(); it != d.end() && n-- > 0; ++it)
{
*ipad++ = *it;
*opad++ = *it;
}
}
else
{
std::memcpy(_ipad, passphrase, length);
std::memcpy(_opad, passphrase, length);
}
for (int i = 0; i < BLOCK_SIZE; ++i)
{
_ipad[i] ^= 0x36;
_opad[i] ^= 0x5c;
}
reset();
}
void updateImpl(const void* data, std::size_t length)
{
_engine.update(data, length);
}
private:
HMACEngine();
HMACEngine(const HMACEngine&);
HMACEngine& operator = (const HMACEngine&);
Engine _engine;
char* _ipad;
char* _opad;
};
} // namespace Poco
#endif // Foundation_HMACEngine_INCLUDED
|