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/**********************************************************************
* gostsum.c *
* Copyright (c) 2005-2006 Cryptocom LTD *
* This file is distributed under the same license as OpenSSL *
* *
* Almost drop-in replacement for md5sum and sha1sum *
* which computes GOST R 34.11-94 hashsum instead *
* *
**********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include "gosthash.h"
#define BUF_SIZE 262144
int hash_file(gost_hash_ctx * ctx, char *filename, char *sum, int mode);
int hash_stream(gost_hash_ctx * ctx, int fd, char *sum);
int get_line(FILE *f, char *hash, char *filename);
void help()
{
fprintf(stderr, "gostsum [-bvt] [-c [file]]| [files]\n"
"\t-c check message digests (default is generate)\n"
"\t-v verbose, print file names when checking\n"
"\t-b read files in binary mode\n"
"\t-t use test GOST paramset (default is CryptoPro paramset)\n"
"The input for -c should be the list of message digests and file names\n"
"that is printed on stdout by this program when it generates digests.\n");
exit(3);
}
#ifndef O_BINARY
# define O_BINARY 0
#endif
int main(int argc, char **argv)
{
int c, i;
int verbose = 0;
int errors = 0;
int open_mode = O_RDONLY;
gost_subst_block *b = &GostR3411_94_CryptoProParamSet;
FILE *check_file = NULL;
gost_hash_ctx ctx;
while ((c = getopt(argc, argv, "bc::tv")) != -1) {
switch (c) {
case 'v':
verbose = 1;
break;
case 't':
b = &GostR3411_94_TestParamSet;
break;
case 'b':
open_mode |= O_BINARY;
break;
case 'c':
if (optarg) {
check_file = fopen(optarg, "r");
if (!check_file) {
perror(optarg);
exit(2);
}
} else {
check_file = stdin;
}
break;
default:
fprintf(stderr, "invalid option %c", optopt);
help();
}
}
init_gost_hash_ctx(&ctx, b);
if (check_file) {
char inhash[65], calcsum[65], filename[PATH_MAX];
int failcount = 0, count = 0;;
if (check_file == stdin && optind < argc) {
check_file = fopen(argv[optind], "r");
if (!check_file) {
perror(argv[optind]);
exit(2);
}
}
while (get_line(check_file, inhash, filename)) {
if (!hash_file(&ctx, filename, calcsum, open_mode)) {
exit(2);
}
count++;
if (!strncmp(calcsum, inhash, 65)) {
if (verbose) {
fprintf(stderr, "%s\tOK\n", filename);
}
} else {
if (verbose) {
fprintf(stderr, "%s\tFAILED\n", filename);
} else {
fprintf(stderr,
"%s: GOST hash sum check failed for '%s'\n",
argv[0], filename);
}
failcount++;
}
}
if (verbose && failcount) {
fprintf(stderr,
"%s: %d of %d file(f) failed GOST hash sum check\n",
argv[0], failcount, count);
}
exit(failcount ? 1 : 0);
}
if (optind == argc) {
char sum[65];
if (!hash_stream(&ctx, fileno(stdin), sum)) {
perror("stdin");
exit(1);
}
printf("%s -\n", sum);
exit(0);
}
for (i = optind; i < argc; i++) {
char sum[65];
if (!hash_file(&ctx, argv[i], sum, open_mode)) {
errors++;
} else {
printf("%s %s\n", sum, argv[i]);
}
}
exit(errors ? 1 : 0);
}
int hash_file(gost_hash_ctx * ctx, char *filename, char *sum, int mode)
{
int fd;
if ((fd = open(filename, mode)) < 0) {
perror(filename);
return 0;
}
if (!hash_stream(ctx, fd, sum)) {
perror(filename);
return 0;
}
close(fd);
return 1;
}
int hash_stream(gost_hash_ctx * ctx, int fd, char *sum)
{
unsigned char buffer[BUF_SIZE];
ssize_t bytes;
int i;
start_hash(ctx);
while ((bytes = read(fd, buffer, BUF_SIZE)) > 0) {
hash_block(ctx, buffer, bytes);
}
if (bytes < 0) {
return 0;
}
finish_hash(ctx, buffer);
for (i = 0; i < 32; i++) {
sprintf(sum + 2 * i, "%02x", buffer[31 - i]);
}
return 1;
}
int get_line(FILE *f, char *hash, char *filename)
{
int i;
if (fread(hash, 1, 64, f) < 64)
return 0;
hash[64] = 0;
for (i = 0; i < 64; i++) {
if (hash[i] < '0' || (hash[i] > '9' && hash[i] < 'A')
|| (hash[i] > 'F' && hash[i] < 'a') || hash[i] > 'f') {
fprintf(stderr, "Not a hash value '%s'\n", hash);
return 0;
}
}
if (fgetc(f) != ' ') {
fprintf(stderr, "Malformed input line\n");
return 0;
}
i = strlen(fgets(filename, PATH_MAX, f));
while (filename[--i] == '\n' || filename[i] == '\r')
filename[i] = 0;
return 1;
}
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