Mercurial > hg > orthanc
view Resources/sha1/shacmp.cpp @ 544:a482948c1fd6 dicom-rt
fix
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 04 Sep 2013 14:19:14 +0200 |
parents | 81b6f3013738 |
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/* * shacmp.cpp * * Copyright (C) 1998, 2009 * Paul E. Jones <paulej@packetizer.com> * All Rights Reserved * ***************************************************************************** * $Id: shacmp.cpp 12 2009-06-22 19:34:25Z paulej $ ***************************************************************************** * * Description: * This utility will compare two files by producing a message digest * for each file using the Secure Hashing Algorithm and comparing * the message digests. This function will return 0 if they * compare or 1 if they do not or if there is an error. * Errors result in a return code higher than 1. * * Portability Issues: * none. * */ #include <stdio.h> #include <string.h> #include "sha1.h" /* * Return codes */ #define SHA1_COMPARE 0 #define SHA1_NO_COMPARE 1 #define SHA1_USAGE_ERROR 2 #define SHA1_FILE_ERROR 3 /* * 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[2][5]; // Message digest for files int i; // Counter bool message_match; // Message digest match flag int returncode; /* * If we have two arguments, we will assume they are filenames. If * we do not have to arguments, call usage() and exit. */ if (argc != 3) { usage(); return SHA1_USAGE_ERROR; } /* * Get the message digests for each file */ for(i = 1; i <= 2; i++) { sha.Reset(); if (!(fp = fopen(argv[i],"rb"))) { fprintf(stderr, "sha: unable to open file %s\n", argv[i]); return SHA1_FILE_ERROR; } c = fgetc(fp); while(!feof(fp)) { sha.Input(c); c = fgetc(fp); } fclose(fp); if (!sha.Result(message_digest[i-1])) { fprintf(stderr,"shacmp: could not compute message digest for %s\n", argv[i]); return SHA1_FILE_ERROR; } } /* * Compare the message digest values */ message_match = true; for(i = 0; i < 5; i++) { if (message_digest[0][i] != message_digest[1][i]) { message_match = false; break; } } if (message_match) { printf("Fingerprints match:\n"); returncode = SHA1_COMPARE; } else { printf("Fingerprints do not match:\n"); returncode = SHA1_NO_COMPARE; } printf( "\t%08X %08X %08X %08X %08X\n", message_digest[0][0], message_digest[0][1], message_digest[0][2], message_digest[0][3], message_digest[0][4]); printf( "\t%08X %08X %08X %08X %08X\n", message_digest[1][0], message_digest[1][1], message_digest[1][2], message_digest[1][3], message_digest[1][4]); return returncode; } /* * usage * * Description: * This function will display program usage information to the user. * * Parameters: * None. * * Returns: * Nothing. * * Comments: * */ void usage() { printf("usage: shacmp <file> <file>\n"); printf("\tThis program will compare the message digests (fingerprints)\n"); printf("\tfor two files using the Secure Hashing Algorithm (SHA-1).\n"); }