78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* harness.c - host-side stand-ins for the interactive PUF demo's HAL so the
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* menu logic, blob parsing, and fail-closed paths can be exercised without
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* hardware. The UART becomes stdio; the PUF region is seeded with a balanced
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* deterministic pattern before main() runs, or left all-zero (which fails the
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* Hamming-weight health band) when PUF_HOST_UNHEALTHY is set.
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*
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* Copyright (C) 2006-2026 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL 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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* wolfSSL 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 02110-1301, USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <wolfssl/wolfcrypt/settings.h>
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#include <wolfssl/wolfcrypt/puf.h>
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extern volatile uint8_t puf_sram_region[WC_PUF_RAW_BYTES];
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__attribute__((constructor))
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static void seed_region(void)
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{
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uint32_t x = 0x12345678u;
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unsigned int i;
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if (getenv("PUF_HOST_UNHEALTHY") != NULL) {
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return; /* all-zero: rejected by the health band */
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}
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for (i = 0; i < (unsigned int)WC_PUF_RAW_BYTES; i++) {
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x ^= x << 13; x ^= x >> 17; x ^= x << 5;
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puf_sram_region[i] = (uint8_t)x;
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}
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}
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void hal_init(void)
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{
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setvbuf(stdout, NULL, _IONBF, 0);
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}
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int uart_getc(void)
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{
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int c = getchar();
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if (c == EOF) {
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exit(0);
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}
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return c;
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}
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void uart_drain(void)
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{
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}
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int custom_rand_gen_block(unsigned char* output, unsigned int sz)
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{
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static uint32_t x = 0xA5A5A5A5u;
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unsigned int i;
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for (i = 0; i < sz; i++) {
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x ^= x << 13; x ^= x >> 17; x ^= x << 5;
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output[i] = (unsigned char)x;
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}
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return 0;
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}
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