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