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