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
|
/*
* cook - file construction tool
* Copyright (C) 1994, 1997, 2006, 2007 Peter Miller;
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate combined fingerprints
*
* Derived from code marked:
* Daniel J. Bernstein, brnstnd@nyu.edu.
* 930708: fprintfile 0.95. Public domain.
* 930708: Added fingerprintfile_addn.
* 930622: Split off fprintfmt.c.
* 930601: Baseline, fprintfile 0.8. Public domain.
* No known patent problems.
*/
#include <common/fp/combined.h>
#include <common/fp/crc32.h>
#include <common/fp/len.h>
#include <common/fp/md5.h>
#include <common/fp/snefru.h>
#include <common/trace.h>
typedef struct combined_ty combined_ty;
struct combined_ty
{
FINGERPRINT_BASE_CLASS
fingerprint_ty *snefru;
fingerprint_ty *md5;
fingerprint_ty *crc32;
fingerprint_ty *len;
};
static void
combined_constructor(fingerprint_ty *p)
{
combined_ty *f;
trace(("constructor\n"));
f = (combined_ty *)p;
f->snefru = fingerprint_new(&fp_snefru);
f->md5 = fingerprint_new(&fp_md5);
f->crc32 = fingerprint_new(&fp_crc32);
f->len = fingerprint_new(&fp_len);
}
static void
combined_destructor(fingerprint_ty *p)
{
combined_ty *f;
f = (combined_ty *)p;
fingerprint_delete(f->snefru);
fingerprint_delete(f->md5);
fingerprint_delete(f->crc32);
fingerprint_delete(f->len);
}
static void
combined_addn(fingerprint_ty *p, const void *s, size_t n)
{
combined_ty *f;
f = (combined_ty *)p;
fingerprint_addn(f->snefru, s, n);
fingerprint_addn(f->md5, s, n);
fingerprint_addn(f->crc32, s, n);
fingerprint_addn(f->len, s, n);
}
static int
combined_hash(fingerprint_ty *p, unsigned char *h, size_t h_len)
{
combined_ty *f;
int nbytes;
unsigned char *obuf;
f = (combined_ty *)p;
obuf = h;
nbytes = fingerprint_hash(f->snefru, h, h_len);
h += nbytes;
h_len -= nbytes;
nbytes = fingerprint_hash(f->md5, h, h_len);
h += nbytes;
h_len -= nbytes;
nbytes = fingerprint_hash(f->crc32, h, h_len);
h += nbytes;
h_len -= nbytes;
nbytes = fingerprint_hash(f->len, h, h_len);
h += nbytes;
h_len -= nbytes;
return (h - obuf);
}
static char base64sane[] =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ:.";
static void
combined_sum(fingerprint_ty *p, char *s, size_t s_len)
{
unsigned char h[1024];
int i;
unsigned long x;
int nbytes;
if (!s_len)
return;
nbytes = combined_hash(p, h, sizeof(h));
assert(nbytes == 57);
for (i = 0; i < 19; ++i)
{
x = (h[3 * i] + 256L * (h[3 * i + 1] + 256L * h[3 * i + 2]));
s[(12 * i) % 76] = base64sane[x & 63];
x /= 64;
s[(12 * i + 41) % 76] = base64sane[x & 63];
x /= 64;
s[(12 * i + 6) % 76] = base64sane[x & 63];
x /= 64;
s[(12 * i + 47) % 76] = base64sane[x & 63];
}
s[76] = 0;
}
fingerprint_methods_ty fp_combined =
{
sizeof(combined_ty),
"fingerprint",
combined_constructor,
combined_destructor,
combined_addn,
combined_hash,
combined_sum
};
|