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
|
/***
* Copyright 2017 Marc Stevens <marc@marc-stevens.nl>, Dan Shumow <danshu@microsoft.com>
* Distributed under the MIT Software License.
* See accompanying file LICENSE.txt or copy at
* https://opensource.org/licenses/MIT
***/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include "sha1.h"
int main(int argc, char** argv)
{
FILE* fd;
unsigned char hash2[20];
char buffer[65536];
size_t size;
SHA1_CTX ctx2;
int i,j;
if (argc < 2)
{
printf("Usage: %s <file>\n", basename(argv[0]));
return 1;
}
for (i=1; i < argc; ++i)
{
// initialize SHA-1 context
SHA1DCInit(&ctx2);
// if the program name includes the word 'partial' then also test for reduced-round SHA-1 collisions
if (NULL != strstr(argv[0], "partial"))
{
SHA1DCSetDetectReducedRoundCollision(&ctx2, 1);
}
// open file
fd = fopen(argv[i], "rb");
if (fd == NULL)
{
printf("cannot open file: %s\n", argv[i]);
return 1;
}
// feed file through SHA-1 update function
while (1)
{
size=fread(buffer,1,65536,fd);
SHA1DCUpdate(&ctx2, buffer, (unsigned)(size));
if (size != 65536)
break;
}
if (ferror(fd))
{
printf("error while reading file: %s\n", argv[i]);
return 1;
}
if (!feof(fd))
{
printf("not end of file?: %s\n",argv[i]);
return 1;
}
// obtain SHA-1 and print it
SHA1DCFinal(hash2,&ctx2);
for (j = 0; j < 20; ++j)
{
sprintf(buffer+(j*2), "%02x", hash2[j]);
}
buffer[20*2] = 0;
if (ctx2.found_collision)
{
printf("%s *coll* %s\n", buffer, argv[i]);
}
else
{
printf("%s %s\n", buffer, argv[i]);
}
fclose(fd);
}
}
|
