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/*
* sha.cpp
*
* Copyright (C) 1998, 2009
* Paul E. Jones <paulej@packetizer.com>
* All Rights Reserved
*
*****************************************************************************
* $Id: sha.c 12 2009-06-22 19:34:25Z 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 <string/stdstring.h>
/*#include "sha1.h"*/
/*
* Function prototype
*/
void usage(void);
/*
* 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:
*
*/
typedef struct SHA1Context
{
unsigned Message_Digest[5]; /* Message Digest (output) */
unsigned Length_Low; /* Message length in bits */
unsigned Length_High; /* Message length in bits */
unsigned char Message_Block[64]; /* 512-bit message blocks */
int Message_Block_Index; /* Index into message block array */
int Computed; /* Is the digest computed? */
int Corrupted; /* Is the message digest corruped? */
} SHA1Context;
int main(int argc, char *argv[])
{
struct SHA1Context sha; /* SHA-1 context */
FILE *fp; /* File pointer for reading files*/
char c; /* Character read from file */
int i; /* Counter */
int reading_stdin; /* Are we reading standard in? */
int read_stdin = 0; /* Have we read stdin? */
/*
* Check the program arguments and print usage information if -?
* or --help is passed as the first argument.
*/
if (argc > 1 && (string_is_equal(argv[1],"-?") ||
string_is_equal(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 || string_is_equal(argv[i],"-"))
{
#ifdef WIN32
setmode(fileno(stdin), _O_BINARY);
#endif
fp = stdin;
reading_stdin = 1;
}
else
{
if (!(fp = fopen(argv[i],"rb")))
{
fprintf(stderr,
"sha: unable to open file %s\n",
argv[i]);
return 2;
}
reading_stdin = 0;
}
/*
* We do not want to read STDIN multiple times
*/
if (reading_stdin)
{
if (read_stdin)
continue;
read_stdin = 1;
}
/*
* Reset the SHA-1 context and process input
*/
SHA1Reset(&sha);
c = fgetc(fp);
while(!feof(fp))
{
SHA1Input(&sha, &c, 1);
c = fgetc(fp);
}
if (!reading_stdin)
fclose(fp);
if (!SHA1Result(&sha))
{
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",
sha.Message_Digest[0],
sha.Message_Digest[1],
sha.Message_Digest[2],
sha.Message_Digest[3],
sha.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(void)
{
printf("usage: sha <file> [<file> ...]\n");
printf("\tThis program will display the message digest\n");
printf("\tfor files using the Secure Hashing Algorithm (SHA-1).\n");
}
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