mirror of https://github.com/wolfSSL/wolfBoot.git
147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/* xmss_common.h
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*
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* Common callback functions used by XMSS to write/read the private
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* key file.
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*
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*
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* Copyright (C) 2023 wolfSSL Inc.
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*
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* This file is part of wolfBoot.
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*
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* wolfBoot is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* wolfBoot is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#ifndef XMSS_COMMON_H
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#define XMSS_COMMON_H
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static enum wc_XmssRc xmss_write_key(const byte * priv, word32 privSz, void * context)
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{
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FILE * file = NULL;
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const char * filename = NULL;
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int n_cmp = 0;
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size_t n_read = 0;
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size_t n_write = 0;
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byte * buff = NULL;
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int err = 0;
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if (priv == NULL || context == NULL || privSz == 0) {
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fprintf(stderr, "error: invalid write args\n");
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return WC_XMSS_RC_BAD_ARG;
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}
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filename = context;
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/* Open file for read and write. */
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file = fopen(filename, "r+");
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if (!file) {
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/* Create the file if it didn't exist. */
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file = fopen(filename, "w+");
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if (!file) {
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fprintf(stderr, "error: fopen(%s, \"w+\") failed: %d\n", filename,
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ferror(file));
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return WC_XMSS_RC_WRITE_FAIL;
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}
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}
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n_write = fwrite(priv, 1, privSz, file);
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if (n_write != privSz) {
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fprintf(stderr, "error: wrote %zu, expected %d: %d\n", n_write, privSz,
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ferror(file));
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return WC_XMSS_RC_WRITE_FAIL;
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}
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err = fclose(file);
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if (err) {
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fprintf(stderr, "error: fclose returned %d\n", err);
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return WC_XMSS_RC_WRITE_FAIL;
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}
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/* Verify private key data has actually been written to persistent
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* storage correctly. */
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file = fopen(filename, "r+");
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if (!file) {
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fprintf(stderr, "error: fopen(%s, \"r+\") failed: %d\n", filename,
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ferror(file));
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return WC_XMSS_RC_WRITE_FAIL;
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}
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buff = malloc(privSz);
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if (buff == NULL) {
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fprintf(stderr, "error: malloc(%d) failed\n", privSz);
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return WC_XMSS_RC_WRITE_FAIL;
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}
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XMEMSET(buff, 0, n_write);
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n_read = fread(buff, 1, n_write, file);
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if (n_read != n_write) {
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fprintf(stderr, "error: read %zu, expected %zu: %d\n", n_read, n_write,
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ferror(file));
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free(buff);
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return WC_XMSS_RC_WRITE_FAIL;
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}
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n_cmp = XMEMCMP(buff, priv, n_write);
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free(buff);
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buff = NULL;
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if (n_cmp != 0) {
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fprintf(stderr, "error: write data was corrupted: %d\n", n_cmp);
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return WC_XMSS_RC_WRITE_FAIL;
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}
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err = fclose(file);
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if (err) {
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fprintf(stderr, "error: fclose returned %d\n", err);
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return WC_XMSS_RC_WRITE_FAIL;
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}
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return WC_XMSS_RC_SAVED_TO_NV_MEMORY;
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}
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static enum wc_XmssRc xmss_read_key(byte * priv, word32 privSz, void * context)
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{
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FILE * file = NULL;
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const char * filename = NULL;
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size_t n_read = 0;
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if (priv == NULL || context == NULL || privSz == 0) {
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fprintf(stderr, "error: invalid read args\n");
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return WC_XMSS_RC_BAD_ARG;
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}
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filename = context;
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file = fopen(filename, "rb");
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if (!file) {
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fprintf(stderr, "error: fopen(%s, \"rb\") failed\n", filename);
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return WC_XMSS_RC_READ_FAIL;
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}
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n_read = fread(priv, 1, privSz, file);
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if (n_read != privSz) {
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fprintf(stderr, "error: read %zu, expected %d: %d\n", n_read, privSz,
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ferror(file));
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return WC_XMSS_RC_READ_FAIL;
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}
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fclose(file);
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return WC_XMSS_RC_READ_TO_MEMORY;
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}
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#endif /* XMSS_COMMON_H */
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