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Merge pull request wolfSSL#468 from danielinux/otpgen
Add command line tool to generate otp.bin
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| /* otp-keystore-primer.c | ||
| * | ||
| * Command line utility to create a OTP image | ||
| * | ||
| * | ||
| * Copyright (C) 2024 wolfSSL Inc. | ||
| * | ||
| * This file is part of wolfBoot. | ||
| * | ||
| * wolfBoot is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * wolfBoot is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA | ||
| */ | ||
| #include <stdint.h> | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
| #include <stddef.h> | ||
| #include <stdlib.h> | ||
| #include <fcntl.h> | ||
| #include <unistd.h> | ||
| #include <errno.h> | ||
|
|
||
| #define OTP_SIZE 4096 | ||
|
|
||
| #include "wolfboot/wolfboot.h" | ||
| #include "keystore.h" | ||
| #include "otp_keystore.h" | ||
|
|
||
| extern struct keystore_slot PubKeys[]; | ||
|
|
||
| const char outfile[] = "otp.bin"; | ||
|
|
||
| int main(void) | ||
| { | ||
| int n_keys = keystore_num_pubkeys(); | ||
| int i; | ||
| struct wolfBoot_otp_hdr hdr; | ||
| uint32_t tot_len; | ||
| int ofd; | ||
| int slot_size; | ||
|
|
||
| memcpy(hdr.keystore_hdr_magic, KEYSTORE_HDR_MAGIC, 8); | ||
| hdr.item_count = n_keys; | ||
| hdr.flags = 0; | ||
| hdr.version = WOLFBOOT_VERSION; | ||
|
|
||
| /* Sanity check to avoid writing an empty keystore */ | ||
| if (n_keys < 1) { | ||
| fprintf(stderr, "Error: too few keys (%d), refusing to create %s\n", n_keys, outfile); | ||
| exit(1); | ||
| } | ||
|
|
||
| slot_size = keystore_get_size(0); | ||
| slot_size += KEYSTORE_HDR_SIZE; | ||
| fprintf(stderr, "Slot size: %d\n", slot_size); | ||
| fprintf(stderr, "Number of slots: %d\n", n_keys); | ||
| fprintf(stderr, "%s size: %d\n", outfile, slot_size * n_keys + sizeof(struct wolfBoot_otp_hdr)); | ||
|
|
||
| ofd = open(outfile, O_WRONLY|O_CREAT|O_TRUNC, 0600); | ||
| if (ofd < 0) { | ||
| perror("opening output file"); | ||
| exit(2); | ||
| } | ||
|
|
||
| /* Write the header to the beginning of the OTP binary file */ | ||
| if (write(ofd, &hdr, sizeof(hdr)) != sizeof(hdr)) { | ||
| fprintf(stderr, "Error writing to %s: %s\n", outfile, strerror(errno)); | ||
| } | ||
|
|
||
| for (i = 0; i < n_keys; i++) { | ||
| /* Write each public key to its slot in OTP */ | ||
| if (write(ofd, &PubKeys[i], | ||
| slot_size) < 0) { | ||
| fprintf(stderr, "Error adding key %d to %s: %s\n", i, outfile, strerror(errno)); | ||
| exit(3); | ||
| } | ||
| } | ||
| fprintf(stderr, "%s successfully created.\nGoodbye.\n", outfile); | ||
| close(ofd); | ||
| return 0; | ||
| } |