tools/ubsha1.c

   1 /*
   2  * (C) Copyright 2007
   3  * Heiko Schocher, DENX Software Engineering, <hs@denx.de>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include "os_support.h"
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <fcntl.h>
  13 #include <errno.h>
  14 #include <string.h>
  15 #include <sys/stat.h>
  16 #include <u-boot/sha1.h>
  17
  18 int main (int argc, char **argv)
  19 {
  20         unsigned char output[20];
  21         int i, len;
  22
  23         char    *imagefile;
  24         char    *cmdname = *argv;
  25         unsigned char   *ptr;
  26         unsigned char   *data;
  27         struct stat sbuf;
  28         unsigned char   *ptroff;
  29         int     ifd;
  30         int     off;
  31
  32         if (argc > 1) {
  33                 imagefile = argv[1];
  34                 ifd = open (imagefile, O_RDWR|O_BINARY);
  35                 if (ifd < 0) {
  36                         fprintf (stderr, "%s: Can't open %s: %s\n",
  37                                 cmdname, imagefile, strerror(errno));
  38                         exit (EXIT_FAILURE);
  39                 }
  40                 if (fstat (ifd, &sbuf) < 0) {
  41                         fprintf (stderr, "%s: Can't stat %s: %s\n",
  42                                 cmdname, imagefile, strerror(errno));
  43                         exit (EXIT_FAILURE);
  44                 }
  45                 len = sbuf.st_size;
  46                 ptr = (unsigned char *)mmap(0, len,
  47                                     PROT_READ, MAP_SHARED, ifd, 0);
  48                 if (ptr == (unsigned char *)MAP_FAILED) {
  49                         fprintf (stderr, "%s: Can't read %s: %s\n",
  50                                 cmdname, imagefile, strerror(errno));
  51                         exit (EXIT_FAILURE);
  52                 }
  53
  54                 /* create a copy, so we can blank out the sha1 sum */
  55                 data = malloc (len);
  56                 memcpy (data, ptr, len);
  57                 off = SHA1_SUM_POS;
  58                 ptroff = &data[len +  off];
  59                 for (i = 0; i < SHA1_SUM_LEN; i++) {
  60                         ptroff[i] = 0;
  61                 }
  62
  63                 sha1_csum ((unsigned char *) data, len, (unsigned char *)output);
  64
  65                 printf ("U-Boot sum:\n");
  66                 for (i = 0; i < 20 ; i++) {
  67                     printf ("%02X ", output[i]);
  68                 }
  69                 printf ("\n");
  70                 /* overwrite the sum in the bin file, with the actual */
  71                 lseek (ifd, SHA1_SUM_POS, SEEK_END);
  72                 if (write (ifd, output, SHA1_SUM_LEN) != SHA1_SUM_LEN) {
  73                         fprintf (stderr, "%s: Can't write %s: %s\n",
  74                                 cmdname, imagefile, strerror(errno));
  75                         exit (EXIT_FAILURE);
  76                 }
  77
  78                 free (data);
  79                 (void) munmap((void *)ptr, len);
  80                 (void) close (ifd);
  81         }
  82
  83         return EXIT_SUCCESS;
  84 }