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comparison Resources/sha1/sha.cpp @ 177:81b6f3013738

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sha1
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 09 Nov 2012 10:42:00 +0100
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176:81f11fb357f2 177:81b6f3013738
1 /*
2 * sha.cpp
3 *
4 * Copyright (C) 1998, 2009
5 * Paul E. Jones <paulej@packetizer.com>
6 * All Rights Reserved
7 *
8 *****************************************************************************
9 * $Id: sha.cpp 13 2009-06-22 20:20:32Z paulej $
10 *****************************************************************************
11 *
12 * Description:
13 * This utility will display the message digest (fingerprint) for
14 * the specified file(s).
15 *
16 * Portability Issues:
17 * None.
18 */
19
20 #include <stdio.h>
21 #include <string.h>
22 #ifdef WIN32
23 #include <io.h>
24 #endif
25 #include <fcntl.h>
26 #include "sha1.h"
27
28 /*
29 * Function prototype
30 */
31 void usage();
32
33
34 /*
35 * main
36 *
37 * Description:
38 * This is the entry point for the program
39 *
40 * Parameters:
41 * argc: [in]
42 * This is the count of arguments in the argv array
43 * argv: [in]
44 * This is an array of filenames for which to compute message digests
45 *
46 * Returns:
47 * Nothing.
48 *
49 * Comments:
50 *
51 */
52 int main(int argc, char *argv[])
53 {
54 SHA1 sha; // SHA-1 class
55 FILE *fp; // File pointer for reading files
56 char c; // Character read from file
57 unsigned message_digest[5]; // Message digest from "sha"
58 int i; // Counter
59 bool reading_stdin; // Are we reading standard in?
60 bool read_stdin = false; // Have we read stdin?
61
62 /*
63 * Check the program arguments and print usage information if -?
64 * or --help is passed as the first argument.
65 */
66 if (argc > 1 && (!strcmp(argv[1],"-?") || !strcmp(argv[1],"--help")))
67 {
68 usage();
69 return 1;
70 }
71
72 /*
73 * For each filename passed in on the command line, calculate the
74 * SHA-1 value and display it.
75 */
76 for(i = 0; i < argc; i++)
77 {
78 /*
79 * We start the counter at 0 to guarantee entry into the for loop.
80 * So if 'i' is zero, we will increment it now. If there is no
81 * argv[1], we will use STDIN below.
82 */
83 if (i == 0)
84 {
85 i++;
86 }
87
88 if (argc == 1 || !strcmp(argv[i],"-"))
89 {
90 #ifdef WIN32
91 _setmode(_fileno(stdin), _O_BINARY);
92 #endif
93 fp = stdin;
94 reading_stdin = true;
95 }
96 else
97 {
98 if (!(fp = fopen(argv[i],"rb")))
99 {
100 fprintf(stderr, "sha: unable to open file %s\n", argv[i]);
101 return 2;
102 }
103 reading_stdin = false;
104 }
105
106 /*
107 * We do not want to read STDIN multiple times
108 */
109 if (reading_stdin)
110 {
111 if (read_stdin)
112 {
113 continue;
114 }
115
116 read_stdin = true;
117 }
118
119 /*
120 * Reset the SHA1 object and process input
121 */
122 sha.Reset();
123
124 c = fgetc(fp);
125 while(!feof(fp))
126 {
127 sha.Input(c);
128 c = fgetc(fp);
129 }
130
131 if (!reading_stdin)
132 {
133 fclose(fp);
134 }
135
136 if (!sha.Result(message_digest))
137 {
138 fprintf(stderr,"sha: could not compute message digest for %s\n",
139 reading_stdin?"STDIN":argv[i]);
140 }
141 else
142 {
143 printf( "%08X %08X %08X %08X %08X - %s\n",
144 message_digest[0],
145 message_digest[1],
146 message_digest[2],
147 message_digest[3],
148 message_digest[4],
149 reading_stdin?"STDIN":argv[i]);
150 }
151 }
152
153 return 0;
154 }
155
156 /*
157 * usage
158 *
159 * Description:
160 * This function will display program usage information to the user.
161 *
162 * Parameters:
163 * None.
164 *
165 * Returns:
166 * Nothing.
167 *
168 * Comments:
169 *
170 */
171 void usage()
172 {
173 printf("usage: sha <file> [<file> ...]\n");
174 printf("\tThis program will display the message digest (fingerprint)\n");
175 printf("\tfor files using the Secure Hashing Algorithm (SHA-1).\n");
176 }