--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Resources/sha1/shacmp.cpp	Fri Nov 09 10:42:00 2012 +0100
@@ -0,0 +1,169 @@
+/*
+ *  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");
+}