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wolfBoot/tools/keytools/keygen.c

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/* keygen.c
*
* C native key generation tool
*
*
* Copyright (C) 2020 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 2 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
*/
/* Option to enable sign tool debugging */
/* Must also define DEBUG_WOLFSSL in user_settings.h */
//#define DEBUG_SIGNTOOL
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <wolfssl/wolfcrypt/settings.h>
#ifndef NO_RSA
#include <wolfssl/wolfcrypt/rsa.h>
#endif
#ifdef HAVE_ECC
#include <wolfssl/wolfcrypt/ecc.h>
#include <wolfssl/wolfcrypt/asn.h>
#endif
#ifdef HAVE_ED25519
#include <wolfssl/wolfcrypt/ed25519.h>
#endif
#include <wolfssl/wolfcrypt/random.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#ifdef DEBUG_SIGNTOOL
#include <wolfssl/wolfcrypt/logging.h>
#endif
#if defined(_WIN32) && !defined(PATH_MAX)
#define PATH_MAX 256
#endif
#define KEYGEN_ED25519 0
#define KEYGEN_ECC256 1
#define KEYGEN_RSA2048 2
#define KEYGEN_RSA4096 3
const char Ed25519_pub_key_define[] = "const uint8_t ed25519_pub_key[32] = {";
const char Ecc256_pub_key_define[] = "const uint8_t ecc256_pub_key[64] = {";
const char Rsa_2048_pub_key_define[] = "const uint8_t rsa2048_pub_key[%d] = {";
const char Rsa_4096_pub_key_define[] = "const uint8_t rsa4096_pub_key[%d] = {";
const char Cfile_Banner[] = "/* Public-key file for wolfBoot, automatically generated. Do not edit. */\n" \
"/*\n" \
" * This file has been generated and contains the public key which is\n" \
" * used by wolfBoot to verify the updates.\n" \
" */" \
"\n#include <stdint.h>\n\n";
static void usage(const char *pname) /* implies exit */
{
printf("Usage: %s [--ed25519 | --ecc256 | --rsa2048 | --rsa4096 ] pub_key_file.c\n", pname);
exit(125);
}
static void fwritekey(uint8_t *key, int len, FILE *f)
{
int i;
for (i = 0; i < len; i++)
{
if ((i % 8) == 0) {
if (i != 0)
fprintf(f, ",");
fprintf(f, "\n\t");
}
else {
fprintf(f, ", ");
}
fprintf(f, "0x%02x", key[i]);
}
}
#if !defined(NO_RSA) && defined(WOLFSSL_KEY_GEN)
static void keygen_rsa(WC_RNG *rng, char *pubkeyfile, int size)
{
RsaKey k;
uint8_t priv_der[4096], pub_der[2048];
int privlen, publen;
FILE *fpub, *fpriv;
char priv_fname[40];
if (wc_MakeRsaKey(&k, size, 65537, rng) != 0) {
fprintf(stderr, "Unable to create RSA%d key\n", size);
exit(1);
}
privlen = wc_RsaKeyToDer(&k, priv_der, size);
if (privlen <= 0) {
fprintf(stderr, "Unable to export private key to DER\n");
exit(2);
}
publen = wc_RsaKeyToPublicDer(&k, pub_der, size);
if (publen <= 0) {
fprintf(stderr, "Unable to export public key\n");
exit(3);
}
sprintf(priv_fname, "rsa%d.der", size);
fpriv = fopen(priv_fname, "wb");
if (fpriv == NULL) {
fprintf(stderr, "Unable to open file '%s' for writing: %s", priv_fname, strerror(errno));
exit(4);
}
fwrite(priv_der, privlen, 1, fpriv);
fclose(fpriv);
fpub = fopen(pubkeyfile, "w");
if (fpub == NULL) {
fprintf(stderr, "Unable to open file '%s' for writing: %s", pubkeyfile, strerror(errno));
exit(4);
}
fprintf(fpub, "%s", Cfile_Banner);
if (size == 2048)
fprintf(fpub, Rsa_2048_pub_key_define, publen);
else
fprintf(fpub, Rsa_4096_pub_key_define, publen);
fwritekey(pub_der, publen, fpub);
fprintf(fpub, "\n};\n");
fprintf(fpub, "const uint32_t rsa%d_pub_key_len = %d;\n", size, publen);
fclose(fpub);
}
#endif
#ifdef HAVE_ECC
#define ECC256_KEY_SIZE 32
static void keygen_ecc256(WC_RNG *rng, char *pubkfile)
{
ecc_key k;
uint8_t Qx[ECC256_KEY_SIZE], Qy[ECC256_KEY_SIZE], d[ECC256_KEY_SIZE];
uint32_t qxsize = ECC256_KEY_SIZE,
qysize = ECC256_KEY_SIZE,
dsize = ECC256_KEY_SIZE;
FILE *fpriv, *fpub;
char priv_fname[20] = "";
if (wc_ecc_make_key(rng, ECC256_KEY_SIZE, &k) != 0) {
fprintf(stderr, "Unable to create ecc%d key\n", ECC256_KEY_SIZE << 3);
exit(1);
}
if (wc_ecc_export_private_raw(&k, Qx, &qxsize, Qy, &qysize, d, &dsize) != 0) {
fprintf(stderr, "Unable to export private key to DER\n");
exit(2);
}
if (wc_ecc_export_public_raw(&k, Qx, &qxsize, Qy, &qysize ) != 0) {
fprintf(stderr, "Unable to export public key\n");
exit(3);
}
sprintf(priv_fname, "ecc%d.der", (ECC256_KEY_SIZE << 3));
fpriv = fopen(priv_fname, "wb");
if (fpriv == NULL) {
fprintf(stderr, "Unable to open file '%s' for writing: %s", priv_fname, strerror(errno));
exit(3);
}
fwrite(Qx, qxsize, 1, fpriv);
fwrite(Qy, qysize, 1, fpriv);
fwrite(d, dsize, 1, fpriv);
fclose(fpriv);
fpub = fopen(pubkfile, "w");
if (fpub == NULL) {
fprintf(stderr, "Unable to open file '%s' for writing: %s", pubkfile, strerror(errno));
exit(4);
}
fprintf(fpub, "%s", Cfile_Banner);
fprintf(fpub, "%s", Ecc256_pub_key_define);
fwritekey(Qx, qxsize, fpub);
fprintf(fpub, ",");
fwritekey(Qy, qysize, fpub);
fprintf(fpub, "\n};\n");
fprintf(fpub, "const uint32_t ecc256_pub_key_len = 64;\n");
fclose(fpub);
}
#endif
#ifdef HAVE_ED25519
static void keygen_ed25519(WC_RNG *rng, char *pubkfile)
{
ed25519_key k;
uint8_t priv[32], pub[32];
FILE *fpriv, *fpub;
uint32_t outlen = ED25519_KEY_SIZE;
if (wc_ed25519_make_key(rng, ED25519_KEY_SIZE, &k) != 0) {
fprintf(stderr, "Unable to create ed25519 key\n");
exit(1);
}
if (wc_ed25519_export_private_only(&k, priv, &outlen) != 0) {
fprintf(stderr, "Unable to export ed25519 private key\n");
exit(2);
}
if (wc_ed25519_export_public(&k, pub, &outlen) != 0) {
fprintf(stderr, "Unable to export ed25519 public key\n");
exit(2);
}
fpriv = fopen("ed25519.der", "wb");
if (fpriv == NULL) {
fprintf(stderr, "Unable to open file 'ed25519.der' for writing: %s", strerror(errno));
exit(3);
}
fwrite(priv, 32, 1, fpriv);
fwrite(pub, 32, 1, fpriv);
fclose(fpriv);
fpub = fopen(pubkfile, "w");
if (fpub == NULL) {
fprintf(stderr, "Unable to open file '%s' for writing: %s", pubkfile, strerror(errno));
exit(4);
}
fprintf(fpub, "%s", Cfile_Banner);
fprintf(fpub, "%s", Ed25519_pub_key_define);
fwritekey(pub, 32, fpub);
fprintf(fpub, "\n};\n");
fprintf(fpub, "const uint32_t ed25519_pub_key_len = 32;\n");
fclose(fpub);
}
#endif
int main(int argc, char** argv)
{
int i;
int force = 0;
int keytype = 0;
const char *kfilename = NULL;
char *output_pubkey_file;
WC_RNG rng;
FILE *f;
#ifdef DEBUG_SIGNTOOL
wolfSSL_Debugging_ON();
#endif
/* Check arguments and print usage */
if (argc < 2 || argc > 4)
usage(argv[0]);
for (i = 1; i < argc - 1; i++) {
/* Parse Arguments */
if (strcmp(argv[i], "--ed25519") == 0) {
keytype = KEYGEN_ED25519;
kfilename = strdup("ed25519.der");
}
else if (strcmp(argv[i], "--ecc256") == 0) {
keytype = KEYGEN_ECC256;
kfilename = strdup("ecc256.der");
}
else if (strcmp(argv[i], "--rsa2048") == 0) {
keytype = KEYGEN_RSA2048;
kfilename = strdup("rsa2048.der");
}
else if (strcmp(argv[i], "--rsa4096") == 0) {
keytype = KEYGEN_RSA4096;
kfilename = strdup("rsa4096.der");
}
else if (strcmp(argv[i], "--force") == 0) {
force = 1;
}
else {
fprintf(stderr, "Invalid argument '%s'.", argv[i]);
usage(argv[0]);
}
}
output_pubkey_file = strdup(argv[argc - 1]);
f = fopen(kfilename, "rb");
if (!force && (f != NULL)) {
char reply[40];
fclose(f);
printf("** Warning: key file already exist! Are you sure you want to generate a new key and overwrite the existing key? [Type 'Yes, I am sure!']: ");
fflush(stdout);
scanf("%s", reply);
printf("Reply is [%s]\n", reply);
if (strcmp(reply, "Yes, I am sure!") != 0) {
printf("Operation aborted by user.");
exit(5);
}
}
printf("Private key: %s\n", kfilename);
printf("Generated public key C file: %s\n", output_pubkey_file);
printf("Generating key...\n");
fflush(stdout);
wc_InitRng(&rng);
switch (keytype) {
#ifdef HAVE_ED25519
case KEYGEN_ED25519:
{
keygen_ed25519(&rng, output_pubkey_file);
break;
}
#endif
#ifdef HAVE_ECC
case KEYGEN_ECC256:
{
keygen_ecc256(&rng, output_pubkey_file);
break;
}
#endif
#ifndef NO_RSA
case KEYGEN_RSA2048:
{
keygen_rsa(&rng, output_pubkey_file, 2048);
break;
}
case KEYGEN_RSA4096:
{
keygen_rsa(&rng, output_pubkey_file, 4096);
break;
}
#endif
} /* end switch */
printf("Done.\n");
return 0;
}
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