tools/ubsha1.c

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