Line data Source code
1 : /* Copyright (C) 2010 Wildfire Games.
2 : * This file is part of 0 A.D.
3 : *
4 : * 0 A.D. is free software: you can redistribute it and/or modify
5 : * it under the terms of the GNU General Public License as published by
6 : * the Free Software Foundation, either version 2 of the License, or
7 : * (at your option) any later version.
8 : *
9 : * 0 A.D. is distributed in the hope that it will be useful,
10 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 : * GNU General Public License for more details.
13 : *
14 : * You should have received a copy of the GNU General Public License
15 : * along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
16 : */
17 :
18 : #ifndef INCLUDED_MD5
19 : #define INCLUDED_MD5
20 :
21 : #include <cstring>
22 :
23 : /**
24 : * MD5 hashing algorithm. Note that MD5 is broken and must not be used for
25 : * anything that requires security.
26 : */
27 : class MD5
28 : {
29 : public:
30 : static const size_t DIGESTSIZE = 16;
31 :
32 : MD5();
33 :
34 19876 : void Update(const u8* data, size_t len)
35 : {
36 : // (Defined inline for efficiency in the common fixed-length fits-in-buffer case)
37 :
38 19876 : const size_t CHUNK_SIZE = sizeof(m_Buf);
39 :
40 19876 : m_InputLen += len;
41 :
42 : // If we have enough space in m_Buf and won't flush, simply append the input
43 19876 : if (m_BufLen + len < CHUNK_SIZE)
44 : {
45 19243 : memcpy(m_Buf + m_BufLen, data, len);
46 19243 : m_BufLen += len;
47 19243 : return;
48 : }
49 :
50 : // Fall back to non-inline function if we have to do more work
51 633 : UpdateRest(data, len);
52 : }
53 :
54 : void Final(u8* digest);
55 :
56 : private:
57 : void InitState();
58 : void UpdateRest(const u8* data, size_t len);
59 : void Transform(const u32* in);
60 : u32 m_Digest[4]; // internal state
61 : u8 m_Buf[64]; // buffered input bytes
62 : size_t m_BufLen; // bytes in m_Buf that are valid
63 : u64 m_InputLen; // bytes
64 : };
65 :
66 : #endif // INCLUDED_MD5
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