测试结果和百度百科测试例子一致。
实现过程中需要注意事项：最后把四个变量A B C D 链接成结果时 ，注意变量高低位的先后顺序，具体参考 LinkResult（）方法。
md5.h
|
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
|
#ifndef _MD5_H_
#define _MD5_H_
#include <iostream>
#include <string>
using namespace std;
class MD5
{
public:
typedef unsigned char uchar8; //make sure it is 8bit
typedef char char8; //make sure it is 8bit
MD5();
void init();
void UpdateMd5(const uchar8 input[], const int length);
void UpdateMd5(const char8 input[], const int length);
void Finalize();
void ComputMd5(const uchar8 input[], const int length);
void ComputMd5(const char8 input[], const int length);
string GetMd5();
void printMd5();
private:
typedef unsigned int uint32; //make sure it is 32 bit;
typedef unsigned long long uint64; //make sure it is 64 bit;
uint32 A, B, C, D;
const static int blockLen_ = 64; // 512/8
//the remain after last updata (because md5 may be computed segment by segment)
uchar8 remain_[blockLen_];
int remainNum_ ; // the number of remain_, < 64
uint64 totalInputBits_;
uchar8 md5Result_[16]; //bit style md5 result,totally 128 bit
char md5Result_hex_[33]; //hexadecimal style result; md5Result_hex_[32]='\0'
bool isDone_; // indicate the comput is finished;
inline uint32 RotateLeft(const uint32 x, int n);
inline uint32 F(const uint32 x, const uint32 y, const uint32 z);
inline uint32 G(const uint32 x, const uint32 y, const uint32 z);
inline uint32 H(const uint32 x, const uint32 y, const uint32 z);
inline uint32 I(const uint32 x, const uint32 y, const uint32 z);
inline void FF(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti);
inline void GG(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti);
inline void HH(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti);
inline void II(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti);
void UcharToUint(uint32 output[], const uchar8 input[], const unsigned int transLength);
void FourRound(const uchar8 block[]);
void LinkResult();
};
/* user guide
you can comput the md5 by using the funtion ComputMd5
eg:
MD5 m;
MD5::char8 str[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
m.ComputMd5(str,sizeof(str) - 1);
m.printMd5();
if you want to comput segment by segment,you can do as follow, and init() is suggested
the begging,and Finalize() must call in the end:
MD5 M;
m.init();
MD5::uchar8 str1[] = "ABCDEFGHIJKLMN";
MD5::uchar8 str2[] = "OPQRSTUVWXYZabcdefghijk";
MD5::uchar8 str3[] = "lmnopqrstuvwxyz";
m.UpdateMd5(str1,sizeof(str1) - 1);
m.UpdateMd5(str2,sizeof(str2) - 1);
m.UpdateMd5(str3,sizeof(str3) - 1);
m.Finalize();
m.printMd5();
if you want to comput the md5 of a file, you can use the interface of this program.
*/
#endif
|
md5.cpp
|
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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
#include"md5.h"
#include<iostream>
using namespace std;
const int S[4][4] = {7, 12, 17, 22,
5, 9, 14, 20,
4, 11, 16, 23,
6, 10, 15, 21};
void MD5::init()
{
A = 0x67452301;
B = 0xefcdab89;
C = 0x98badcfe;
D = 0x10325476;
remainNum_ = 0;
remain_[0] = '\0';
md5Result_hex_[0] = '\0';
md5Result_[0] = '\0';
totalInputBits_ = 0;
isDone_ = false;
}
MD5::MD5()
{
init();
}
inline MD5::uint32 MD5::RotateLeft(const uint32 x, int n)
{
return (x << n) | (x >> (32-n));
// if x is signed, use: (x << n) | ((x & 0xFFFFFFFF) >> (32-n))
}
inline MD5::uint32 MD5::F(const uint32 x, const uint32 y, const uint32 z)
{
return (x & y) | ((~x) & z);
}
inline MD5::uint32 MD5::G(const uint32 x, const uint32 y, const uint32 z)
{
return (x & z) | (y & (~z));
}
inline MD5::uint32 MD5::H(const uint32 x, const uint32 y, const uint32 z)
{
return x ^ y ^ z;
}
inline MD5::uint32 MD5::I(const uint32 x, const uint32 y, const uint32 z)
{
return y ^ (x | (~z));
}
inline void MD5::FF(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti)
{
a = b + RotateLeft(a + F(b, c, d) + Mj + ti, s);
}
inline void MD5::GG(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti)
{
a = b + RotateLeft(a + G(b, c, d) + Mj + ti, s);
}
inline void MD5::HH(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti)
{
a = b + RotateLeft(a + H(b, c, d) + Mj + ti, s);
}
inline void MD5::II(uint32 &a, const uint32 b, const uint32 c, const uint32 d,
const uint32 Mj, const int s, const uint32 ti)
{
a = b + RotateLeft(a + I(b, c, d) + Mj + ti, s);
}
// link A B C D to result(bit style result and hexadecimal style result)
void MD5::LinkResult()
{
//bit style result
for(int i = 0; i < 4; i++) //link A: low to high
{
md5Result_[i] = (A >> 8*i) & 0xff;
}
for(int i = 4; i<8; i++) //link B: low to high
{
md5Result_[i] = (B >> 8*(i - 4)) & 0xff;
}
for(int i = 8; i<12; i++) //link C: low to high
{
md5Result_[i] = (C >> 8*(i - 8)) & 0xff;
}
for(int i = 12; i<16; i++) //link D: low to high
{
md5Result_[i] = (D >> 8*(i - 12)) & 0xff;
}
//change to hexadecimal style result
// note: it is not the same as simply link hex(A) hex(B) hex(C) hex(D)
for(int i = 0; i < 16; i++)
sprintf(& md5Result_hex_[i*2], "%02x", md5Result_[i]);
md5Result_hex_[32] = '\0';
}
//print the md5 by hex
void MD5::printMd5()
{
if(!isDone_)
{
cout<< "Error: computation is not finished" <<endl;
}
else
cout<< "MD5 Value: " << md5Result_hex_ <<endl;
}
//get the md5 value of hex style
string MD5::GetMd5()
{
if(!isDone_)
{
cout<< "Error: computation is not finished" <<endl;
exit(0);
}
string a((const char *)md5Result_hex_);
return a;
}
void MD5::UcharToUint(uint32 output[], const uchar8 input[], const unsigned int transLength)
{
for(int i = 0, j = 0; j < transLength; i++, j += 4)
{
output[i] = ((uint32)input[j]) | (((uint32)input[j+1]) << 8) |
(((uint32)input[j+2]) << 16) | (((uint32)input[j+3]) << 24);
}
}
// four round on a block of 512 bits;
void MD5::FourRound(const uchar8 block[])
{
uint32 a = A, b = B, c = C, d = D;
uint32 M[16];
UcharToUint(M, block, blockLen_); //blockLen_ is a const int =64;
//round 1
FF (a, b, c, d, M[ 0], S[0][0], 0xd76aa478);
FF (d, a, b, c, M[ 1], S[0][1], 0xe8c7b756);
FF (c, d, a, b, M[ 2], S[0][2], 0x242070db);
FF (b, c, d, a, M[ 3], S[0][3], 0xc1bdceee);
FF (a, b, c, d, M[ 4], S[0][0], 0xf57c0faf);
FF (d, a, b, c, M[ 5], S[0][1], 0x4787c62a);
FF (c, d, a, b, M[ 6], S[0][2], 0xa8304613);
FF (b, c, d, a, M[ 7], S[0][3], 0xfd469501);
FF (a, b, c, d, M[ 8], S[0][0], 0x698098d8);
FF (d, a, b, c, M[ 9], S[0][1], 0x8b44f7af);
FF (c, d, a, b, M[10], S[0][2], 0xffff5bb1);
FF (b, c, d, a, M[11], S[0][3], 0x895cd7be);
FF (a, b, c, d, M[12], S[0][0], 0x6b901122);
FF (d, a, b, c, M[13], S[0][1], 0xfd987193);
FF (c, d, a, b, M[14], S[0][2], 0xa679438e);
FF (b, c, d, a, M[15], S[0][3], 0x49b40821);
// round 2
GG (a, b, c, d, M[ 1], S[1][0], 0xf61e2562);
GG (d, a, b, c, M[ 6], S[1][1], 0xc040b340);
GG (c, d, a, b, M[11], S[1][2], 0x265e5a51);
GG (b, c, d, a, M[ 0], S[1][3], 0xe9b6c7aa);
GG (a, b, c, d, M[ 5], S[1][0], 0xd62f105d);
GG (d, a, b, c, M[10], S[1][1], 0x2441453);
GG (c, d, a, b, M[15], S[1][2], 0xd8a1e681);
GG (b, c, d, a, M[ 4], S[1][3], 0xe7d3fbc8);
GG (a, b, c, d, M[ 9], S[1][0], 0x21e1cde6);
GG (d, a, b, c, M[14], S[1][1], 0xc33707d6);
GG (c, d, a, b, M[ 3], S[1][2], 0xf4d50d87);
GG (b, c, d, a, M[ 8], S[1][3], 0x455a14ed);
GG (a, b, c, d, M[13], S[1][0], 0xa9e3e905);
GG (d, a, b, c, M[ 2], S[1][1], 0xfcefa3f8);
GG (c, d, a, b, M[ 7], S[1][2], 0x676f02d9);
GG (b, c, d, a, M[12], S[1][3], 0x8d2a4c8a);
//round 3
HH (a, b, c, d, M[ 5], S[2][0], 0xfffa3942);
HH (d, a, b, c, M[ 8], S[2][1], 0x8771f681);
HH (c, d, a, b, M[11], S[2][2], 0x6d9d6122);
HH (b, c, d, a, M[14], S[2][3], 0xfde5380c);
HH (a, b, c, d, M[ 1], S[2][0], 0xa4beea44);
HH (d, a, b, c, M[ 4], S[2][1], 0x4bdecfa9);
HH (c, d, a, b, M[ 7], S[2][2], 0xf6bb4b60);
HH (b, c, d, a, M[10], S[2][3], 0xbebfbc70);
HH (a, b, c, d, M[13], S[2][0], 0x289b7ec6);
HH (d, a, b, c, M[ 0], S[2][1], 0xeaa127fa);
HH (c, d, a, b, M[ 3], S[2][2], 0xd4ef3085);
HH (b, c, d, a, M[ 6], S[2][3], 0x4881d05);
HH (a, b, c, d, M[ 9], S[2][0], 0xd9d4d039);
HH (d, a, b, c, M[12], S[2][1], 0xe6db99e5);
HH (c, d, a, b, M[15], S[2][2], 0x1fa27cf8);
HH (b, c, d, a, M[ 2], S[2][3], 0xc4ac5665);
//round 4
II (a, b, c, d, M[ 0], S[3][0], 0xf4292244);
II (d, a, b, c, M[ 7], S[3][1], 0x432aff97);
II (c, d, a, b, M[14], S[3][2], 0xab9423a7);
II (b, c, d, a, M[ 5], S[3][3], 0xfc93a039);
II (a, b, c, d, M[12], S[3][0], 0x655b59c3);
II (d, a, b, c, M[ 3], S[3][1], 0x8f0ccc92);
II (c, d, a, b, M[10], S[3][2], 0xffeff47d);
II (b, c, d, a, M[ 1], S[3][3], 0x85845dd1);
II (a, b, c, d, M[ 8], S[3][0], 0x6fa87e4f);
II (d, a, b, c, M[15], S[3][1], 0xfe2ce6e0);
II (c, d, a, b, M[ 6], S[3][2], 0xa3014314);
II (b, c, d, a, M[13], S[3][3], 0x4e0811a1);
II (a, b, c, d, M[ 4], S[3][0], 0xf7537e82);
II (d, a, b, c, M[11], S[3][1], 0xbd3af235);
II (c, d, a, b, M[ 2], S[3][2], 0x2ad7d2bb);
II (b, c, d, a, M[ 9], S[3][3], 0xeb86d391);
A += a;
B += b;
C += c;
D += d;
}
// update md5,must consider the remain_.
void MD5::UpdateMd5(const uchar8 input[], const int length)
{
isDone_ = false;
totalInputBits_ += (length << 3);
int start = blockLen_ - remainNum_; //blockLen_ = 64
//copy a part of input to remain_ so it can form a block(size=64)
if(start <= length)
{
// can form a block,then do FourRound to this block
memcpy(&remain_[remainNum_], input, start) ;
FourRound(remain_);
int i;
for(i = start; i <= length - blockLen_; i += blockLen_)
{
FourRound(&input[i]);
}
remainNum_ = length - i;
memcpy(remain_, &input[i], remainNum_);
}
else
{
// can not form a block, function return;
memcpy(&remain_[remainNum_], input, length);
remainNum_ += length;
}
}
void MD5::UpdateMd5(const char8 input[], const int length)
{
UpdateMd5((const uchar8 *)input, length);
}
// padding with 100000... to remain_ and add the 64bit original size of input
void MD5::Finalize()
{
if(isDone_ == true)
return;
uchar8 padding[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
int temp = 56 - remainNum_; //56 = 448/8
if(temp > 0)
{
UpdateMd5(padding, temp);
totalInputBits_ -= (temp << 3);
}
else if(temp < 0)
{
UpdateMd5(padding, 64 + temp);
totalInputBits_ -= ((64 + temp) << 3);
}
// trans totalInputBits_ to uchar8 (64bits)
uchar8 Bits[8];
for(int i = 0; i < 8; i++)
{
Bits[i] = (totalInputBits_ >> 8*i) & 0xff;
}
UpdateMd5(Bits, 8); // add the number of original input (the last 64bits)
LinkResult();
isDone_ = true;
}
// comput the md5 based on input, (just this one input)
void MD5::ComputMd5(const uchar8 input[], const int length)
{
init();
UpdateMd5(input, length);
Finalize();
}
void MD5::ComputMd5(const char8 input[], const int length)
{
ComputMd5((const uchar8 *)input, length);
}
|