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view Resources/sha1/sha.cpp @ 365:cda6938a8c6f
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 06 Feb 2013 18:01:45 +0100 |
parents | 81b6f3013738 |
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/* * 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"); }