/*
* The MySensors Arduino library handles the wireless radio link and protocol
* between your home built sensors/actuators and HA controller of choice.
* The sensors forms a self healing radio network with optional repeaters. Each
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
* network topology allowing messages to be routed to nodes.
*
* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
* Copyright (C) 2013-2019 Sensnology AB
* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
*
* Documentation: http://www.mysensors.org
* Support Forum: http://forum.mysensors.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#include "MySigning.h"
#define SIGNING_PRESENTATION_VERSION_1 1
#define SIGNING_PRESENTATION_REQUIRE_SIGNATURES (1 << 0)
#define SIGNING_PRESENTATION_REQUIRE_WHITELISTING (1 << 1)
#if defined(MY_DEBUG_VERBOSE_SIGNING)
#define SIGN_DEBUG(x,...) DEBUG_OUTPUT(x, ##__VA_ARGS__)
#else
#define SIGN_DEBUG(x,...)
#endif
#if defined(MY_SIGNING_REQUEST_SIGNATURES) &&\
(!defined(MY_SIGNING_ATSHA204) && !defined(MY_SIGNING_SOFT))
#error You have to pick either MY_SIGNING_ATSHA204 or MY_SIGNING_SOFT to reqire signatures!
#endif
#if defined(MY_SIGNING_SOFT) && defined(MY_SIGNING_ATSHA204)
#error You have to pick one and only one signing backend
#endif
#ifdef MY_SIGNING_FEATURE
static uint8_t _doSign[32]; // Bitfield indicating which sensors require signed communication
static uint8_t _doWhitelist[32]; // Bitfield indicating which sensors require salted signatures
static MyMessage _msgSign; // Buffer for message to sign.
static uint8_t _signingNonceStatus;
static bool stateValid = false;
#ifdef MY_NODE_LOCK_FEATURE
static uint8_t nof_nonce_requests = 0;
static uint8_t nof_failed_verifications = 0;
#endif
// Status when waiting for signing nonce in signerSignMsg
enum { SIGN_WAITING_FOR_NONCE = 0, SIGN_OK = 1 };
// Macros for manipulating signing requirement tables
#define DO_SIGN(node) (~_doSign[node>>3]&(1<<node%8))
#define SET_SIGN(node) (_doSign[node>>3]&=~(1<<node%8))
#if defined(MY_SIGNING_WEAK_SECURITY)
#define CLEAR_SIGN(node) (_doSign[node>>3]|=(1<<node%8))
#endif
#define DO_WHITELIST(node) (~_doWhitelist[node>>3]&(1<<node%8))
#define SET_WHITELIST(node) (_doWhitelist[node>>3]&=~(1<<node%8))
#if defined(MY_SIGNING_WEAK_SECURITY)
#define CLEAR_WHITELIST(node) (_doWhitelist[node>>3]|=(1<<node%8))
#endif
#if defined(MY_SIGNING_SOFT)
extern bool signerAtsha204SoftInit(void);
extern bool signerAtsha204SoftCheckTimer(void);
extern bool signerAtsha204SoftGetNonce(MyMessage &msg);
extern void signerAtsha204SoftPutNonce(MyMessage &msg);
extern bool signerAtsha204SoftVerifyMsg(MyMessage &msg);
extern bool signerAtsha204SoftSignMsg(MyMessage &msg);
#define signerBackendInit signerAtsha204SoftInit
#define signerBackendCheckTimer signerAtsha204SoftCheckTimer
#define signerBackendGetNonce signerAtsha204SoftGetNonce
#define signerBackendPutNonce signerAtsha204SoftPutNonce
#define signerBackendVerifyMsg signerAtsha204SoftVerifyMsg
#define signerBackendSignMsg signerAtsha204SoftSignMsg
#elif defined(MY_SIGNING_ATSHA204)
extern bool signerAtsha204Init(void);
extern bool signerAtsha204CheckTimer(void);
extern bool signerAtsha204GetNonce(MyMessage &msg);
extern void signerAtsha204PutNonce(MyMessage &msg);
extern bool signerAtsha204VerifyMsg(MyMessage &msg);
extern bool signerAtsha204SignMsg(MyMessage &msg);
#define signerBackendInit signerAtsha204Init
#define signerBackendCheckTimer signerAtsha204CheckTimer
#define signerBackendGetNonce signerAtsha204GetNonce
#define signerBackendPutNonce signerAtsha204PutNonce
#define signerBackendVerifyMsg signerAtsha204VerifyMsg
#define signerBackendSignMsg signerAtsha204SignMsg
#endif
static bool skipSign(MyMessage &msg);
#else // not MY_SIGNING_FEATURE
#define signerBackendCheckTimer() true
#endif // MY_SIGNING_FEATURE
static void prepareSigningPresentation(MyMessage &msg, uint8_t destination);
static bool signerInternalProcessPresentation(MyMessage &msg);
static bool signerInternalProcessNonceRequest(MyMessage &msg);
static bool signerInternalProcessNonceResponse(MyMessage &msg);
#if (defined(MY_ENCRYPTION_FEATURE) || defined(MY_SIGNING_FEATURE)) &&\
!defined(MY_SIGNING_SIMPLE_PASSWD)
static bool signerInternalValidatePersonalization(void);
#endif
void signerInit(void)
{
#if defined(MY_SIGNING_FEATURE)
stateValid = true;
#endif
#if (defined (MY_ENCRYPTION_FEATURE) || defined (MY_SIGNING_FEATURE)) &&\
!defined (MY_SIGNING_SIMPLE_PASSWD)
// Suppress this warning since it is only fixed on Linux builds and this keeps the code more tidy
// cppcheck-suppress knownConditionTrueFalse
if (!signerInternalValidatePersonalization()) {
SIGN_DEBUG(PSTR("!SGN:PER:TAMPERED\n"));
#if defined(MY_SIGNING_FEATURE)
stateValid = false;
#endif
} else {
SIGN_DEBUG(PSTR("SGN:PER:OK\n"));
}
#endif
#if defined(MY_SIGNING_FEATURE)
// Read out the signing requirements from EEPROM
hwReadConfigBlock((void*)_doSign, (void*)EEPROM_SIGNING_REQUIREMENT_TABLE_ADDRESS,
sizeof(_doSign));
// Read out the whitelist requirements from EEPROM
hwReadConfigBlock((void*)_doWhitelist, (void*)EEPROM_WHITELIST_REQUIREMENT_TABLE_ADDRESS,
sizeof(_doWhitelist));
if (!signerBackendInit()) {
SIGN_DEBUG(PSTR("!SGN:INI:BND FAIL\n"));
} else {
SIGN_DEBUG(PSTR("SGN:INI:BND OK\n"));
}
#endif
}
void signerPresentation(MyMessage &msg, uint8_t destination)
{
prepareSigningPresentation(msg, destination);
#if defined(MY_SIGNING_REQUEST_SIGNATURES)
msg.data[1] |= SIGNING_PRESENTATION_REQUIRE_SIGNATURES;
SIGN_DEBUG(PSTR("SGN:PRE:SGN REQ\n")); // Signing required
#else
SIGN_DEBUG(PSTR("SGN:PRE:SGN NREQ\n")); // Signing not required
#endif
#if defined(MY_SIGNING_NODE_WHITELISTING)
msg.data[1] |= SIGNING_PRESENTATION_REQUIRE_WHITELISTING;
SIGN_DEBUG(PSTR("SGN:PRE:WHI REQ\n")); // Whitelisting required
#else
SIGN_DEBUG(PSTR("SGN:PRE:WHI NREQ\n")); // Whitelisting not required
#endif
if (!_sendRoute(msg)) {
SIGN_DEBUG(PSTR("!SGN:PRE:XMT,TO=%" PRIu8 " FAIL\n"),
destination); // Failed to transmit presentation!
} else {
SIGN_DEBUG(PSTR("SGN:PRE:XMT,TO=%" PRIu8 "\n"), destination); // Transmitted signing presentation!
}
if (destination == GATEWAY_ADDRESS) {
SIGN_DEBUG(PSTR("SGN:PRE:WAIT GW\n")); // Waiting for GW to send signing preferences...
wait(2000, C_INTERNAL, I_SIGNING_PRESENTATION);
}
}
bool signerProcessInternal(MyMessage &msg)
{
bool ret;
switch (msg.getType()) {
case I_SIGNING_PRESENTATION:
ret = signerInternalProcessPresentation(msg);
break;
case I_NONCE_REQUEST:
ret = signerInternalProcessNonceRequest(msg);
break;
case I_NONCE_RESPONSE:
ret = signerInternalProcessNonceResponse(msg);
break;
default:
ret = false; // Let the transport process this message further as it is not related to signing
break;
}
return ret;
}
bool signerCheckTimer(void)
{
return signerBackendCheckTimer();
}
bool signerSignMsg(MyMessage &msg)
{
#if defined(MY_SIGNING_FEATURE)
bool ret;
// If destination is known to require signed messages and we are the sender,
// sign this message unless it is identified as an exception
if (DO_SIGN(msg.getDestination()) && msg.getSender() == getNodeId()) {
if (skipSign(msg)) {
ret = true;
} else {
// Before starting, validate that our state is good, or signing will fail
if (!stateValid) {
SIGN_DEBUG(PSTR("!SGN:SGN:STATE\n")); // Signing system is not in a valid state
ret = false;
} else {
// Send nonce-request
_signingNonceStatus=SIGN_WAITING_FOR_NONCE;
if (!_sendRoute(build(_msgSign, msg.getDestination(), msg.getSensor(), C_INTERNAL,
I_NONCE_REQUEST).set(""))) {
SIGN_DEBUG(PSTR("!SGN:SGN:NCE REQ,TO=%" PRIu8 " FAIL\n"),
msg.getDestination()); // Failed to transmit nonce request!
ret = false;
} else {
SIGN_DEBUG(PSTR("SGN:SGN:NCE REQ,TO=%" PRIu8 "\n"), msg.getDestination()); // Nonce requested
// We have to wait for the nonce to arrive before we can sign our original message
// Other messages could come in-between. We trust _process() takes care of them
unsigned long enter = hwMillis();
_msgSign = msg; // Copy the message to sign since buffer might be touched in _process()
while (hwMillis() - enter < MY_VERIFICATION_TIMEOUT_MS &&
_signingNonceStatus==SIGN_WAITING_FOR_NONCE) {
_process();
}
if (hwMillis() - enter > MY_VERIFICATION_TIMEOUT_MS) {
SIGN_DEBUG(PSTR("!SGN:SGN:NCE TMO\n")); // Timeout waiting for nonce!
ret = false;
} else {
if (_signingNonceStatus == SIGN_OK) {
// process() received a nonce and signerProcessInternal successfully signed the message
msg = _msgSign; // Write the signed message back
SIGN_DEBUG(PSTR("SGN:SGN:SGN\n")); // Message to send has been signed
ret = true;
// After this point, only the 'last' member of the message structure is allowed to be
// altered if the message has been signed, or signature will become invalid and the
// message rejected by the receiver
} else {
SIGN_DEBUG(PSTR("!SGN:SGN:SGN FAIL\n")); // Message to send could not be signed!
ret = false;
}
}
}
}
}
} else if (getNodeId() == msg.getSender()) {
msg.setSigned(false); // Message is not supposed to be signed, make sure it is marked unsigned
SIGN_DEBUG(PSTR("SGN:SGN:NREQ=%" PRIu8 "\n"),
msg.getDestination()); // Do not sign message as it is not req
ret = true;
} else {
SIGN_DEBUG(PSTR("SGN:SGN:%" PRIu8 "!=%" PRIu8 " NUS\n"), msg.getSender(),
getNodeId()); // Will not sign message since it was from someone else
ret = true;
}
return ret;
#else
(void)msg;
return true;
#endif // MY_SIGNING_FEATURE
}
bool signerVerifyMsg(MyMessage &msg)
{
bool verificationResult = true;
// Before processing message, reject unsigned messages if signing is required and check signature
// (if it is signed and addressed to us)
// Note that we do not care at all about any signature found if we do not require signing
#if defined(MY_SIGNING_FEATURE) && defined(MY_SIGNING_REQUEST_SIGNATURES)
// If we are a node, or we are a gateway and the sender require signatures (or just a strict gw)
// and we are the destination...
#if defined(MY_SIGNING_WEAK_SECURITY)
if ((!MY_IS_GATEWAY || DO_SIGN(msg.getSender())) && msg.getDestination() == getNodeId()) {
#else
if (msg.getDestination() == getNodeId()) {
#endif
// Internal messages of certain types are not verified
if (skipSign(msg)) {
verificationResult = true;
} else if (!msg.getSigned()) {
// Got unsigned message that should have been signed
SIGN_DEBUG(PSTR("!SGN:VER:NSG\n")); // Message is not signed, but it should have been!
verificationResult = false;
} else {
// Before starting, validate that our state is good, or signing will fail
if (!stateValid) {
SIGN_DEBUG(PSTR("!SGN:VER:STATE\n")); // Signing system is not in a valid state
verificationResult = false;
} else {
if (!signerBackendVerifyMsg(msg)) {
SIGN_DEBUG(PSTR("!SGN:VER:FAIL\n")); // Signature verification failed!
verificationResult = false;
} else {
SIGN_DEBUG(PSTR("SGN:VER:OK\n"));
}
}
#if defined(MY_NODE_LOCK_FEATURE)
if (verificationResult) {
// On successful verification, clear lock counters
nof_nonce_requests = 0;
nof_failed_verifications = 0;
} else {
nof_failed_verifications++;
SIGN_DEBUG(PSTR("SGN:VER:LEFT=%" PRIu8 "\n"), MY_NODE_LOCK_COUNTER_MAX-nof_failed_verifications);
if (nof_failed_verifications >= MY_NODE_LOCK_COUNTER_MAX) {
_nodeLock("TMFV"); // Too many failed verifications
}
}
#endif
msg.setSigned(false); // Clear the sign-flag now as verification is completed
}
}
#else
(void)msg;
#endif // MY_SIGNING_REQUEST_SIGNATURES
return verificationResult;
}
int signerMemcmp(const void* a, const void* b, size_t sz)
{
int retVal;
size_t i;
int done = 0;
const uint8_t* ptrA = (const uint8_t*)a;
const uint8_t* ptrB = (const uint8_t*)b;
for (i=0; i < sz; i++) {
if (ptrA[i] == ptrB[i]) {
if (done > 0) {
done = 1;
} else {
done = 0;
}
} else {
if (done > 0) {
done = 2;
} else {
done = 3;
}
}
}
if (done > 0) {
retVal = -1;
} else {
retVal = 0;
}
return retVal;
}
#if defined(MY_SIGNING_FEATURE)
// Helper function to centralize signing/verification exceptions
static bool skipSign(MyMessage &msg)
{
bool ret = false;
if (msg.isEcho()) {
ret = true;
} else if (msg.getCommand() == C_INTERNAL &&
(msg.getType() == I_SIGNING_PRESENTATION ||
msg.getType() == I_REGISTRATION_REQUEST ||
msg.getType() == I_NONCE_REQUEST || msg.getType() == I_NONCE_RESPONSE ||
msg.getType() == I_ID_REQUEST || msg.getType() == I_ID_RESPONSE ||
msg.getType() == I_FIND_PARENT_REQUEST || msg.getType() == I_FIND_PARENT_RESPONSE ||
msg.getType() == I_HEARTBEAT_REQUEST || msg.getType() == I_HEARTBEAT_RESPONSE ||
msg.getType() == I_PING || msg.getType() == I_PONG ||
msg.getType() == I_DISCOVER_REQUEST || msg.getType() == I_DISCOVER_RESPONSE ||
msg.getType() == I_LOG_MESSAGE)) {
ret = true;
} else if (msg.getCommand() == C_STREAM &&
(msg.getType() == ST_SOUND ||
msg.getType() == ST_IMAGE ||
msg.getType() == ST_FIRMWARE_REQUEST || msg.getType() == ST_FIRMWARE_RESPONSE )) {
ret = true;
}
if (ret) {
SIGN_DEBUG(PSTR("SGN:SKP:%s CMD=%" PRIu8 ",TYPE=%" PRIu8 "\n"), msg.isEcho() ? "ECHO" : "MSG",
msg.getCommand(),
msg.getType()); //Skip signing/verification of this message
}
return ret;
}
#endif
// Helper to prepare a signing presentation message
static void prepareSigningPresentation(MyMessage &msg, uint8_t destination)
{
// Only supports version 1 for now
(void)build(msg, destination, NODE_SENSOR_ID, C_INTERNAL, I_SIGNING_PRESENTATION).set("");
msg.setLength(2);
msg.setPayloadType(P_CUSTOM); // displayed as hex
msg.data[0] = SIGNING_PRESENTATION_VERSION_1;
msg.data[1] = 0;
}
// Helper to process presentation messages
static bool signerInternalProcessPresentation(MyMessage &msg)
{
const uint8_t sender = msg.getSender();
#if defined(MY_SIGNING_FEATURE)
if (msg.data[0] != SIGNING_PRESENTATION_VERSION_1) {
SIGN_DEBUG(PSTR("!SGN:PRE:VER=%" PRIu8 "\n"),
msg.data[0]); // Unsupported signing presentation version
return true; // Just drop this presentation message
}
// We only handle version 1 here...
if (msg.data[1] & SIGNING_PRESENTATION_REQUIRE_SIGNATURES) {
// We received an indicator that the sender require us to sign all messages we send to it
SIGN_DEBUG(PSTR("SGN:PRE:SGN REQ,FROM=%" PRIu8 "\n"), sender); // Node require signatures
SET_SIGN(sender);
} else {
#if defined(MY_SIGNING_WEAK_SECURITY)
// We received an indicator that the sender does not require us to sign messages we send to it
SIGN_DEBUG(PSTR("SGN:PRE:SGN NREQ,FROM=%" PRIu8 "\n"), sender); // Node does not require signatures
CLEAR_SIGN(sender);
#else
if (DO_SIGN(sender)) {
SIGN_DEBUG(PSTR("!SGN:PRE:SGN NREQ,FROM=%" PRIu8 " REJ\n"),
sender); // Node does not require signatures but used to do so
}
#endif
}
if (msg.data[1] & SIGNING_PRESENTATION_REQUIRE_WHITELISTING) {
// We received an indicator that the sender require us to salt signatures with serial
SIGN_DEBUG(PSTR("SGN:PRE:WHI REQ,FROM=%" PRIu8 "\n"), sender); // Node require whitelisting
SET_WHITELIST(sender);
} else {
#if defined(MY_SIGNING_WEAK_SECURITY)
// We received an indicator that the sender does not require us to sign messages we send to it
SIGN_DEBUG(PSTR("SGN:PRE:WHI NREQ,FROM=%" PRIu8 "\n"),
sender); // Node does not require whitelisting
CLEAR_WHITELIST(sender);
#else
if (DO_WHITELIST(sender)) {
SIGN_DEBUG(PSTR("!SGN:PRE:WHI NREQ,FROM=%" PRIu8 " REJ\n"),
sender); // Node does not require whitelisting but used to do so
}
#endif
}
// Save updated tables
hwWriteConfigBlock((void*)_doSign, (void*)EEPROM_SIGNING_REQUIREMENT_TABLE_ADDRESS,
sizeof(_doSign));
hwWriteConfigBlock((void*)_doWhitelist, (void*)EEPROM_WHITELIST_REQUIREMENT_TABLE_ADDRESS,
sizeof(_doWhitelist));
// Inform sender about our preference if we are a gateway, but only require signing if the sender
// required signing unless we explicitly configure it to
#if defined(MY_GATEWAY_FEATURE)
prepareSigningPresentation(msg, sender);
#if defined(MY_SIGNING_REQUEST_SIGNATURES)
#if defined(MY_SIGNING_WEAK_SECURITY)
if (DO_SIGN(sender)) {
msg.data[1] |= SIGNING_PRESENTATION_REQUIRE_SIGNATURES;
}
#else
msg.data[1] |= SIGNING_PRESENTATION_REQUIRE_SIGNATURES;
#endif
#endif // MY_SIGNING_REQUEST_SIGNATURES
#if defined(MY_SIGNING_NODE_WHITELISTING)
msg.data[1] |= SIGNING_PRESENTATION_REQUIRE_WHITELISTING;
#endif // MY_SIGNING_NODE_WHITELISTING
if (msg.data[1] & SIGNING_PRESENTATION_REQUIRE_SIGNATURES) {
SIGN_DEBUG(PSTR("SGN:PRE:SGN REQ,TO=%" PRIu8 "\n"),
sender); // Inform node that we require signatures
} else {
SIGN_DEBUG(PSTR("SGN:PRE:SGN NREQ,TO=%" PRIu8 "\n"),
sender); // Inform node that we do not require signatures
}
if (msg.data[1] & SIGNING_PRESENTATION_REQUIRE_WHITELISTING) {
SIGN_DEBUG(PSTR("SGN:PRE:WHI REQ,TO=%" PRIu8 "\n"),
sender); // Inform node that we require whitelisting
} else {
SIGN_DEBUG(PSTR("SGN:PRE:WHI NREQ,TO=%" PRIu8 "\n"),
sender); // Inform node that we do not require whitelisting
}
if (!_sendRoute(msg)) {
SIGN_DEBUG(PSTR("!SGN:PRE:XMT,TO=%" PRIu8 " FAIL\n"),
sender); // Failed to transmit signing presentation!
} else {
SIGN_DEBUG(PSTR("SGN:PRE:XMT,TO=%" PRIu8 "\n"), sender);
}
#endif // MY_GATEWAY_FEATURE
#else // not MY_SIGNING_FEATURE
#if defined(MY_GATEWAY_FEATURE)
// If we act as gateway and do not have the signing feature and receive a signing request we still
// need to do make sure the requester does not believe the gateway still require signatures
prepareSigningPresentation(msg, sender);
SIGN_DEBUG(PSTR("SGN:PRE:NSUP,TO=%" PRIu8 "\n"),
sender); // Informing node that we do not support signing
if (!_sendRoute(msg)) {
SIGN_DEBUG(PSTR("!SGN:PRE:XMT,TO=%" PRIu8 " FAIL\n"),
sender); // Failed to transmit signing presentation!
} else {
SIGN_DEBUG(PSTR("SGN:PRE:XMT,TO=%" PRIu8 "\n"), sender);
}
#else // not MY_GATEWAY_FEATURE
// If we act as a node and do not have the signing feature then we just silently drop any signing
// presentation messages received
(void)msg;
(void)sender;
// Received signing presentation, but signing is not supported (message ignored)
SIGN_DEBUG(
PSTR("SGN:PRE:NSUP\n"));
#endif // not MY_GATEWAY_FEATURE
#endif // not MY_SIGNING_FEATURE
return true; // No need to further process I_SIGNING_PRESENTATION
}
// Helper to process nonce request messages
static bool signerInternalProcessNonceRequest(MyMessage &msg)
{
#if defined(MY_SIGNING_FEATURE)
#if defined(MY_NODE_LOCK_FEATURE)
nof_nonce_requests++;
SIGN_DEBUG(PSTR("SGN:NCE:LEFT=%" PRIu8 "\n"),
MY_NODE_LOCK_COUNTER_MAX-nof_nonce_requests); // Nonce requests left until lockdown
if (nof_nonce_requests >= MY_NODE_LOCK_COUNTER_MAX) {
_nodeLock("TMNR"); // Too many nonces requested
}
#endif // MY_NODE_LOCK_FEATURE
if (signerBackendGetNonce(msg)) {
if (!_sendRoute(build(msg, msg.getSender(), NODE_SENSOR_ID, C_INTERNAL, I_NONCE_RESPONSE))) {
SIGN_DEBUG(PSTR("!SGN:NCE:XMT,TO=%" PRIu8 " FAIL\n"), msg.getSender()); // Failed to transmit nonce!
} else {
SIGN_DEBUG(PSTR("SGN:NCE:XMT,TO=%" PRIu8 "\n"), msg.getSender());
}
} else {
SIGN_DEBUG(PSTR("!SGN:NCE:GEN\n")); // Failed to generate nonce!
}
#else // not MY_SIGNING_FEATURE
(void)msg;
SIGN_DEBUG(
PSTR("SGN:NCE:NSUP (DROPPED)\n")); // Received nonce request/response without signing support
#endif // MY_SIGNING_FEATURE
return true; // No need to further process I_NONCE_REQUEST
}
// Helper to process nonce response messages
static bool signerInternalProcessNonceResponse(MyMessage &msg)
{
#if defined(MY_SIGNING_FEATURE)
// Proceed with signing if nonce has been received
SIGN_DEBUG(PSTR("SGN:NCE:FROM=%" PRIu8 "\n"), msg.getSender());
if (msg.getSender() != _msgSign.getDestination()) {
SIGN_DEBUG(PSTR("SGN:NCE:%" PRIu8 "!=%" PRIu8 " (DROPPED)\n"), _msgSign.getDestination(),
msg.getSender());
} else {
signerBackendPutNonce(msg);
if (signerBackendSignMsg(_msgSign)) {
// _msgSign now contains the signed message pending transmission
_signingNonceStatus = SIGN_OK;
}
}
#else
(void)msg;
SIGN_DEBUG(
PSTR("SGN:NCE:NSUP (DROPPED)\n")); // Received nonce request/response without signing support
#endif
return true; // No need to further process I_NONCE_RESPONSE
}
#if (defined(MY_ENCRYPTION_FEATURE) || defined(MY_SIGNING_FEATURE)) &&\
!defined(MY_SIGNING_SIMPLE_PASSWD)
static bool signerInternalValidatePersonalization(void)
{
#ifdef __linux__
// Personalization on linux is a bit more crude
return true;
#else
uint8_t buffer[SIZE_SIGNING_SOFT_HMAC_KEY + SIZE_RF_ENCRYPTION_AES_KEY + SIZE_SIGNING_SOFT_SERIAL];
uint8_t hash[32];
uint8_t checksum;
hwReadConfigBlock((void*)buffer, (void*)EEPROM_SIGNING_SOFT_HMAC_KEY_ADDRESS,
SIZE_SIGNING_SOFT_HMAC_KEY);
hwReadConfigBlock((void*)&buffer[SIZE_SIGNING_SOFT_HMAC_KEY],
(void*)EEPROM_RF_ENCRYPTION_AES_KEY_ADDRESS, SIZE_RF_ENCRYPTION_AES_KEY);
hwReadConfigBlock((void*)&buffer[SIZE_SIGNING_SOFT_HMAC_KEY + SIZE_RF_ENCRYPTION_AES_KEY],
(void*)EEPROM_SIGNING_SOFT_SERIAL_ADDRESS, SIZE_SIGNING_SOFT_SERIAL);
hwReadConfigBlock((void*)&checksum, (void*)EEPROM_PERSONALIZATION_CHECKSUM_ADDRESS,
SIZE_PERSONALIZATION_CHECKSUM);
SHA256(hash, buffer, sizeof(buffer));
return (checksum == hash[0]);
#endif
}
#endif