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
|
/*
* sha.cpp
*
* Copyright (C) 1998, 2009
* Paul E. Jones <paulej@packetizer.com>
* All Rights Reserved
*
*****************************************************************************
* $Id: sha.cpp 13 2009-06-22 20:20:32Z paulej $
*****************************************************************************
*
* Description:
* This utility will display the message digest (fingerprint) for
* the specified file(s).
*
* Portability Issues:
* None.
*/
#include <stdio.h>
#include <string.h>
#ifdef WIN32
#include <io.h>
#endif
#include <fcntl.h>
#include "sha1.h"
/*
* Function prototype
*/
void usage();
/*
* main
*
* Description:
* This is the entry point for the program
*
* Parameters:
* argc: [in]
* This is the count of arguments in the argv array
* argv: [in]
* This is an array of filenames for which to compute message digests
*
* Returns:
* Nothing.
*
* Comments:
*
*/
int main(int argc, char *argv[])
{
SHA1 sha; // SHA-1 class
FILE *fp; // File pointer for reading files
char c; // Character read from file
unsigned message_digest[5]; // Message digest from "sha"
int i; // Counter
bool reading_stdin; // Are we reading standard in?
bool read_stdin = false; // Have we read stdin?
/*
* Check the program arguments and print usage information if -?
* or --help is passed as the first argument.
*/
if (argc > 1 && (!strcmp(argv[1],"-?") || !strcmp(argv[1],"--help")))
{
usage();
return 1;
}
/*
* For each filename passed in on the command line, calculate the
* SHA-1 value and display it.
*/
for(i = 0; i < argc; i++)
{
/*
* We start the counter at 0 to guarantee entry into the for loop.
* So if 'i' is zero, we will increment it now. If there is no
* argv[1], we will use STDIN below.
*/
if (i == 0)
{
i++;
}
if (argc == 1 || !strcmp(argv[i],"-"))
{
#ifdef WIN32
_setmode(_fileno(stdin), _O_BINARY);
#endif
fp = stdin;
reading_stdin = true;
}
else
{
if (!(fp = fopen(argv[i],"rb")))
{
fprintf(stderr, "sha: unable to open file %s\n", argv[i]);
return 2;
}
reading_stdin = false;
}
/*
* We do not want to read STDIN multiple times
*/
if (reading_stdin)
{
if (read_stdin)
{
continue;
}
read_stdin = true;
}
/*
* Reset the SHA1 object and process input
*/
sha.Reset();
c = fgetc(fp);
while(!feof(fp))
{
sha.Input(c);
c = fgetc(fp);
}
if (!reading_stdin)
{
fclose(fp);
}
if (!sha.Result(message_digest))
{
fprintf(stderr,"sha: could not compute message digest for %s\n",
reading_stdin?"STDIN":argv[i]);
}
else
{
printf( "%08X %08X %08X %08X %08X - %s\n",
message_digest[0],
message_digest[1],
message_digest[2],
message_digest[3],
message_digest[4],
reading_stdin?"STDIN":argv[i]);
}
}
return 0;
}
/*
* usage
*
* Description:
* This function will display program usage information to the user.
*
* Parameters:
* None.
*
* Returns:
* Nothing.
*
* Comments:
*
*/
void usage()
{
printf("usage: sha <file> [<file> ...]\n");
printf("\tThis program will display the message digest (fingerprint)\n");
printf("\tfor files using the Secure Hashing Algorithm (SHA-1).\n");
}
|
