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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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