Crypto++ 8.9
Free C++ class library of cryptographic schemes
md2.cpp
1// md2.cpp - modified by Wei Dai from Andrew M. Kuchling's md2.c
2// The original code and all modifications are in the public domain.
3
4// This is the original introductory comment:
5
6/*
7 * md2.c : MD2 hash algorithm.
8 *
9 * Part of the Python Cryptography Toolkit, version 1.1
10 *
11 * Distribute and use freely; there are no restrictions on further
12 * dissemination and usage except those imposed by the laws of your
13 * country of residence.
14 *
15 */
16
17#include "pch.h"
18#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1
19#include "md2.h"
20
21NAMESPACE_BEGIN(CryptoPP)
22namespace Weak1 {
23
24MD2::MD2()
25 : m_X(48), m_C(16), m_buf(16)
26{
27 Init();
28}
29
30void MD2::Init()
31{
32 std::memset(m_X, 0, 48);
33 std::memset(m_C, 0, 16);
34 std::memset(m_buf, 0, 16);
35 m_count = 0;
36}
37
38void MD2::Update(const byte *buf, size_t len)
39{
40 static const byte S[256] = {
41 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
42 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
43 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
44 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
45 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
46 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
47 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
48 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
49 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
50 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
51 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
52 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
53 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
54 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
55 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
56 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
57 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
58 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
59 };
60
61 while (len)
62 {
63 unsigned int L = UnsignedMin(16U-m_count, len);
64 std::memcpy(m_buf+m_count, buf, L);
65 m_count+=L;
66 buf+=L;
67 len-=L;
68 if (m_count==16)
69 {
70 byte t;
71 int i,j;
72
73 m_count=0;
74 std::memcpy(m_X+16, m_buf, 16);
75 t=m_C[15];
76 for(i=0; i<16; i++)
77 {
78 m_X[32+i]=m_X[16+i]^m_X[i];
79 t=m_C[i]^=S[m_buf[i]^t];
80 }
81
82 t=0;
83 for(i=0; i<18; i++)
84 {
85 for(j=0; j<48; j+=8)
86 {
87 t=m_X[j+0]^=S[t];
88 t=m_X[j+1]^=S[t];
89 t=m_X[j+2]^=S[t];
90 t=m_X[j+3]^=S[t];
91 t=m_X[j+4]^=S[t];
92 t=m_X[j+5]^=S[t];
93 t=m_X[j+6]^=S[t];
94 t=m_X[j+7]^=S[t];
95 }
96 t = byte((t+i) & 0xFF);
97 }
98 }
99 }
100}
101
102void MD2::TruncatedFinal(byte *hash, size_t size)
103{
104 ThrowIfInvalidTruncatedSize(size);
105
106 byte padding[16];
107 word32 padlen;
108 unsigned int i;
109
110 padlen= 16-m_count;
111 for(i=0; i<padlen; i++) padding[i]=(byte)padlen;
112 Update(padding, padlen);
113 Update(m_C, 16);
114 std::memcpy(hash, m_X, size);
115
116 Init();
117}
118
119}
120NAMESPACE_END
unsigned char byte
8-bit unsigned datatype
Definition config_int.h:66
unsigned int word32
32-bit unsigned datatype
Definition config_int.h:72
Classes for the MD2 message digest.
const T1 UnsignedMin(const T1 &a, const T2 &b)
Safe comparison of values that could be negative and incorrectly promoted.
Definition misc.h:695
Crypto++ library namespace.
Precompiled header file.