1//
2// MD4Engine.h
3//
4// Library: Foundation
5// Package: Crypt
6// Module: MD4Engine
7//
8// Definition of class MD4Engine.
9//
10// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
11// and Contributors.
12//
13// SPDX-License-Identifier: BSL-1.0
14//
15//
16// MD4 (RFC 1320) algorithm:
17// Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
18// rights reserved.
19//
20// License to copy and use this software is granted provided that it
21// is identified as the "RSA Data Security, Inc. MD4 Message-Digest
22// Algorithm" in all material mentioning or referencing this software
23// or this function.
24//
25// License is also granted to make and use derivative works provided
26// that such works are identified as "derived from the RSA Data
27// Security, Inc. MD4 Message-Digest Algorithm" in all material
28// mentioning or referencing the derived work.
29//
30// RSA Data Security, Inc. makes no representations concerning either
31// the merchantability of this software or the suitability of this
32// software for any particular purpose. It is provided "as is"
33// without express or implied warranty of any kind.
34//
35// These notices must be retained in any copies of any part of this
36// documentation and/or software.
37//
38
39
40#ifndef Foundation_MD4Engine_INCLUDED
41#define Foundation_MD4Engine_INCLUDED
42
43
44#include "Poco/Foundation.h"
45#include "Poco/DigestEngine.h"
46
47
48namespace Poco {
49
50
51class Foundation_API MD4Engine: public DigestEngine
52 /// This class implements the MD4 message digest algorithm,
53 /// described in RFC 1320.
54{
55public:
56 enum
57 {
58 BLOCK_SIZE = 64,
59 DIGEST_SIZE = 16
60 };
61
62 MD4Engine();
63 ~MD4Engine();
64
65 std::size_t digestLength() const;
66 void reset();
67 const DigestEngine::Digest& digest();
68
69protected:
70 void updateImpl(const void* data, std::size_t length);
71
72private:
73 static void transform(UInt32 state[4], const unsigned char block[64]);
74 static void encode(unsigned char* output, const UInt32* input, std::size_t len);
75 static void decode(UInt32* output, const unsigned char* input, std::size_t len);
76
77 struct Context
78 {
79 UInt32 state[4]; // state (ABCD)
80 UInt32 count[2]; // number of bits, modulo 2^64 (lsb first)
81 unsigned char buffer[64]; // input buffer
82 };
83
84 Context _context;
85 DigestEngine::Digest _digest;
86
87 MD4Engine(const MD4Engine&);
88 MD4Engine& operator = (const MD4Engine&);
89};
90
91
92} // namespace Poco
93
94
95#endif // Foundation_MD5Engine_INCLUDED
96