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/*
* Copyright (c) 2022, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <endian.h>
#include <errno.h>
#include <limits.h>
#include <common/debug.h>
#include <common/tbbr/cot_def.h>
#include <drivers/clk.h>
#include <drivers/st/stm32_hash.h>
#include <lib/fconf/fconf.h>
#include <lib/fconf/fconf_dyn_cfg_getter.h>
#include <lib/fconf/fconf_tbbr_getter.h>
#include <lib/mmio.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
#include <plat/common/platform.h>
#include <boot_api.h>
#include <platform_def.h>
#define HEADER_AND_EXT_TOTAL_SIZE 512
static uint8_t der_sha256_header[] = {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60,
0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20};
static uint8_t root_pk_hash[HASH_DER_LEN];
static int copy_hash_from_otp(const char *otp_name, uint8_t *hash, size_t len)
{
uint32_t otp_idx;
uint32_t otp_len;
size_t i;
bool valid = false;
assert(len % sizeof(uint32_t) == 0);
if (stm32_get_otp_index(otp_name, &otp_idx, &otp_len) != 0) {
VERBOSE("%s: get %s index error\n", __func__, otp_name);
return -EINVAL;
}
if (otp_len != (len * CHAR_BIT)) {
VERBOSE("%s: length Error\n", __func__);
return -EINVAL;
}
for (i = 0U; i < len / sizeof(uint32_t); i++) {
uint32_t tmp;
uint32_t otp_val;
uint32_t first;
if (stm32_get_otp_value_from_idx(otp_idx + i, &otp_val) != 0) {
VERBOSE("%s: unable to read from otp\n", __func__);
return -EINVAL;
}
tmp = bswap32(otp_val);
memcpy(hash + i * sizeof(uint32_t), &tmp, sizeof(tmp));
if (i == 0U) {
first = tmp;
}
/*
* Check if key hash values in OTP are 0 or 0xFFFFFFFFF
* programmed : Invalid Key
*/
if (!stm32mp_is_closed_device() && !valid) {
if ((tmp != 0U) && (tmp != 0xFFFFFFFFU) && (tmp != first)) {
valid = true;
}
}
}
if (!stm32mp_is_closed_device() && !valid) {
return 0;
}
return len;
}
#if STM32_HEADER_VERSION_MAJOR == 1
static int get_rotpk_hash(void *cookie, uint8_t *hash, size_t len)
{
if (cookie != NULL) {
return -EINVAL;
}
return copy_hash_from_otp(PKH_OTP, hash, len);
}
#else
static int get_rotpk_hash(void *cookie, uint8_t *hash, size_t len)
{
int ret;
uint32_t pk_idx = 0U;
uint8_t calc_hash[BOOT_API_SHA256_DIGEST_SIZE_IN_BYTES];
uint8_t otp_hash[BOOT_API_SHA256_DIGEST_SIZE_IN_BYTES];
boot_api_image_header_t *hdr = (boot_api_image_header_t *)(SRAM3_BASE + SRAM3_SIZE -
HEADER_AND_EXT_TOTAL_SIZE);
boot_extension_header_t *ext_header = (boot_extension_header_t *)hdr->ext_header;
boot_ext_header_params_authentication_t *param;
if (cookie != NULL) {
return -EINVAL;
}
if (hdr->header_version != BOOT_API_HEADER_VERSION) {
VERBOSE("%s: unexpected header_version\n", __func__);
return -EINVAL;
}
param = (boot_ext_header_params_authentication_t *)ext_header->params;
pk_idx = param->pk_idx;
stm32_hash_init(HASH_SHA256);
ret = stm32_hash_final_update((uint8_t *)param->pk_hashes,
param->nb_pk * sizeof(boot_api_sha256_t), calc_hash);
if (ret != 0) {
VERBOSE("%s: hash failed\n", __func__);
return -EINVAL;
}
ret = copy_hash_from_otp(PKH_OTP, otp_hash, len);
if (ret < 0) {
return -EINVAL;
}
if (ret != 0) {
ret = memcmp(calc_hash, otp_hash, sizeof(calc_hash));
if (ret != 0) {
VERBOSE("%s: not expected digest\n", __func__);
return -EINVAL;
}
ret = sizeof(otp_hash);
}
memcpy(hash, param->pk_hashes[pk_idx], sizeof(otp_hash));
return ret;
}
#endif
int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
unsigned int *flags)
{
size_t start_copy_idx = 0U;
int res;
memcpy(root_pk_hash, der_sha256_header, sizeof(der_sha256_header));
start_copy_idx = sizeof(der_sha256_header);
res = get_rotpk_hash(cookie, root_pk_hash + start_copy_idx,
BOOT_API_SHA256_DIGEST_SIZE_IN_BYTES);
if (res < 0) {
return -EINVAL;
}
*key_len = HASH_DER_LEN;
*key_ptr = &root_pk_hash;
*flags = ROTPK_IS_HASH;
if ((res == 0) && !stm32mp_is_closed_device()) {
*flags |= ROTPK_NOT_DEPLOYED;
}
return 0;
}
int plat_get_nv_ctr(void *cookie, unsigned int *nv_ctr)
{
clk_enable(TAMP_BKP_REG_CLK);
*nv_ctr = mmio_read_32(TAMP_BASE + TAMP_COUNTR);
clk_disable(TAMP_BKP_REG_CLK);
return 0;
}
int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr)
{
clk_enable(TAMP_BKP_REG_CLK);
while (mmio_read_32(TAMP_BASE + TAMP_COUNTR) != nv_ctr) {
mmio_write_32(TAMP_BASE + TAMP_COUNTR, 1U);
}
clk_disable(TAMP_BKP_REG_CLK);
return 0;
}
int plat_get_mbedtls_heap(void **heap_addr, size_t *heap_size)
{
assert(heap_addr != NULL);
assert(heap_size != NULL);
#if STM32MP_USE_EXTERNAL_HEAP
/* Retrieve the already allocated heap's info from DTB */
*heap_addr = FCONF_GET_PROPERTY(tbbr, dyn_config, mbedtls_heap_addr);
*heap_size = FCONF_GET_PROPERTY(tbbr, dyn_config, mbedtls_heap_size);
/* We expect heap already statically mapped */
return 0;
#else
return get_mbedtls_heap_helper(heap_addr, heap_size);
#endif
}
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