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comparison Resources/sha1/shacmp.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 * shacmp.cpp
3 *
4 * Copyright (C) 1998, 2009
5 * Paul E. Jones <paulej@packetizer.com>
6 * All Rights Reserved
7 *
8 *****************************************************************************
9 * $Id: shacmp.cpp 12 2009-06-22 19:34:25Z paulej $
10 *****************************************************************************
11 *
12 * Description:
13 * This utility will compare two files by producing a message digest
14 * for each file using the Secure Hashing Algorithm and comparing
15 * the message digests. This function will return 0 if they
16 * compare or 1 if they do not or if there is an error.
17 * Errors result in a return code higher than 1.
18 *
19 * Portability Issues:
20 * none.
21 *
22 */
23
24 #include <stdio.h>
25 #include <string.h>
26 #include "sha1.h"
27
28 /*
29 * Return codes
30 */
31 #define SHA1_COMPARE 0
32 #define SHA1_NO_COMPARE 1
33 #define SHA1_USAGE_ERROR 2
34 #define SHA1_FILE_ERROR 3
35
36 /*
37 * Function prototype
38 */
39 void usage();
40
41 /*
42 * main
43 *
44 * Description:
45 * This is the entry point for the program
46 *
47 * Parameters:
48 * argc: [in]
49 * This is the count of arguments in the argv array
50 * argv: [in]
51 * This is an array of filenames for which to compute message digests
52 *
53 * Returns:
54 * Nothing.
55 *
56 * Comments:
57 *
58 */
59 int main(int argc, char *argv[])
60 {
61 SHA1 sha; // SHA-1 class
62 FILE *fp; // File pointer for reading files
63 char c; // Character read from file
64 unsigned message_digest[2][5]; // Message digest for files
65 int i; // Counter
66 bool message_match; // Message digest match flag
67 int returncode;
68
69 /*
70 * If we have two arguments, we will assume they are filenames. If
71 * we do not have to arguments, call usage() and exit.
72 */
73 if (argc != 3)
74 {
75 usage();
76 return SHA1_USAGE_ERROR;
77 }
78
79 /*
80 * Get the message digests for each file
81 */
82 for(i = 1; i <= 2; i++)
83 {
84 sha.Reset();
85
86 if (!(fp = fopen(argv[i],"rb")))
87 {
88 fprintf(stderr, "sha: unable to open file %s\n", argv[i]);
89 return SHA1_FILE_ERROR;
90 }
91
92 c = fgetc(fp);
93 while(!feof(fp))
94 {
95 sha.Input(c);
96 c = fgetc(fp);
97 }
98
99 fclose(fp);
100
101 if (!sha.Result(message_digest[i-1]))
102 {
103 fprintf(stderr,"shacmp: could not compute message digest for %s\n",
104 argv[i]);
105 return SHA1_FILE_ERROR;
106 }
107 }
108
109 /*
110 * Compare the message digest values
111 */
112 message_match = true;
113 for(i = 0; i < 5; i++)
114 {
115 if (message_digest[0][i] != message_digest[1][i])
116 {
117 message_match = false;
118 break;
119 }
120 }
121
122 if (message_match)
123 {
124 printf("Fingerprints match:\n");
125 returncode = SHA1_COMPARE;
126 }
127 else
128 {
129 printf("Fingerprints do not match:\n");
130 returncode = SHA1_NO_COMPARE;
131 }
132
133 printf( "\t%08X %08X %08X %08X %08X\n",
134 message_digest[0][0],
135 message_digest[0][1],
136 message_digest[0][2],
137 message_digest[0][3],
138 message_digest[0][4]);
139 printf( "\t%08X %08X %08X %08X %08X\n",
140 message_digest[1][0],
141 message_digest[1][1],
142 message_digest[1][2],
143 message_digest[1][3],
144 message_digest[1][4]);
145
146 return returncode;
147 }
148
149 /*
150 * usage
151 *
152 * Description:
153 * This function will display program usage information to the user.
154 *
155 * Parameters:
156 * None.
157 *
158 * Returns:
159 * Nothing.
160 *
161 * Comments:
162 *
163 */
164 void usage()
165 {
166 printf("usage: shacmp <file> <file>\n");
167 printf("\tThis program will compare the message digests (fingerprints)\n");
168 printf("\tfor two files using the Secure Hashing Algorithm (SHA-1).\n");
169 }