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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 
main(int argc,char ** argv)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 }
84