hashgraph/md5.cpp at master · conanwu777/hashgraph · GitHub

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
#include "md5.hpp"

unsigned int g_a;
unsigned int g_b;
unsigned int g_c;
unsigned int g_d;

unsigned int g_k[64];

t_bt g_m[16][4];

static unsigned int g_coe[64] = {7, 12, 17, 22, 7, 12, 17, 22,
	7, 12, 17, 22, 7, 12, 17, 22,
	5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
	4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
	6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21 };

static unsigned int	rotate(unsigned int nbr, int n)
{
	int				i;
	unsigned int	bit;

	i = 0;
	while (i < n)
	{
		bit = (nbr & 1) << 31;
		nbr = nbr >> 1;
		nbr += bit;
		i++;
	}
	return (nbr);
}

static void			reverse_bits(unsigned int *c)
{
	unsigned int t;

	t = 0;
	t += *c & 0xff;
	t = t << 8;
	t += (*c >> 8) & 0xff;
	t = t << 8;
	t += (*c >> 16) & 0xff;
	t = t << 8;
	t += (*c >> 24) & 0xff;
	*c = t;
}

static void	do_step(int const i, t_v *vp)
{
	if (0 <= i && i < 16)
	{
		vp->f = (vp->b & vp->c) | ((~vp->b) & vp->d);
		vp->g = i;
	}
	else if (16 <= i && i < 32)
	{
		vp->f = (vp->d & vp->b) | ((~vp->d) & vp->c);
		vp->g = (5 * i + 1) & 15;
	}
	else if (32 <= i && i < 48)
	{
		vp->f = vp->b ^ vp->c ^ vp->d;
		vp->g = (3 * i + 5) & 15;
	}
	else
	{
		vp->f = vp->c ^ (vp->b | (~vp->d));
		vp->g = 7 * i & 15;
	}
	vp->f += vp->a + g_k[i] + *((unsigned int*)(g_m[vp->g]));
	vp->a = vp->d;
	vp->d = vp->c;
	vp->c = vp->b;
	vp->b += (vp->f << g_coe[i]) | (vp->f >> (32 - g_coe[i]));
}

static void	do_stage(int const count, t_v *vp)
{
	int i;
	int j;

	vp->a = g_a;
	vp->b = g_b;
	vp->c = g_c;
	vp->d = g_d;
	i = -1;
	while (++i < 16)
	{
		j = -1;
		while (++j < 4)
			g_m[i][j] = g_new[count * 64 + i * 4 + j];
	}
	i = -1;
	while (++i < 64)
		do_step(i, vp);
	g_a += vp->a;
	g_b += vp->b;
	g_c += vp->c;
	g_d += vp->d;
}

static void	set_up(std::string const str)
{
	int		i;
	t_bt	bt;

	g_len = str.size() << 3;
	g_cks = (str.size() + 8) / 64 + 1;
	g_new = (t_bt*)malloc(64 * g_cks);
	i = -1;
	while (++i < (int)(64 * g_cks))
		g_new[i] = 0;
	i = -1;
	while (str[++i])
		g_new[i] = str[i];
	bt = 1 << 7;
	g_new[str.size()] = bt;
	i = -1;
	while (++i < 8)
		g_new[64 * g_cks - i - 1] = ((char*)(&g_len))[i];
}

void md5Init()
{
	int i = -1;
	while (++i < 64)
		g_k[i] = floor(pow(2, 32) * fabs(sin(i + 1)));
}

const std::string	md5_hash(std::string const str)
{
	t_v				v;
	unsigned int	count;
	int				i;
	std::ostringstream	s;

	g_a = 0x67452301;
	g_b = 0xefcdab89;
	g_c = 0x98badcfe;
	g_d = 0x10325476;
	set_up(str);
	count = -1;
	while (++count < g_cks)
		do_stage(count, &v);
	reverse_bits(&g_a);
	reverse_bits(&g_b);
	reverse_bits(&g_c);
	reverse_bits(&g_d);
	s << std::hex << std::setfill('0') << std::setw(8) << g_a;
	s << std::hex << std::setfill('0') << std::setw(8) << g_b;
	s << std::hex << std::setfill('0') << std::setw(8) << g_c;
	s << std::hex << std::setfill('0') << std::setw(8) << g_d;
	if (g_new)
		free(g_new);
	return (s.str());
}