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Key regen and MQTT fix (#4585)

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* Add public key regen

* Properly label and handle PKI MQTT packets

* Extra debug message to indicate PKI_UNKNOWN_PUBKEY

* Ternary!

* Don't call non-existant function on stm32

* Actually fix STM32 compilation
This commit is contained in:
Jonathan Bennett
2024-08-29 16:28:03 -05:00
committed by GitHub
parent 22454c95c7
commit 5bc17a9911
6 changed files with 62 additions and 25 deletions
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25
src/mesh/CryptoEngine.cpp
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@@ -11,6 +11,7 @@
#include <Curve25519.h>
#include <SHA256.h>
#if !(MESHTASTIC_EXCLUDE_PKI_KEYGEN)
/**
* Create a public/private key pair with Curve25519.
*
@@ -24,6 +25,30 @@ void CryptoEngine::generateKeyPair(uint8_t *pubKey, uint8_t *privKey)
memcpy(pubKey, public_key, sizeof(public_key));
memcpy(privKey, private_key, sizeof(private_key));
}
/**
* regenerate a public key with Curve25519.
*
* @param pubKey The destination for the public key.
* @param privKey The source for the private key.
*/
bool CryptoEngine::regeneratePublicKey(uint8_t *pubKey, uint8_t *privKey)
{
if (!memfll(privKey, 0, sizeof(private_key))) {
Curve25519::eval(pubKey, privKey, 0);
if (Curve25519::isWeakPoint(pubKey)) {
LOG_ERROR("PKI key generation failed. Specified private key results in a weak\n");
memset(pubKey, 0, 32);
return false;
}
memcpy(private_key, privKey, sizeof(private_key));
memcpy(public_key, pubKey, sizeof(public_key));
} else {
LOG_WARN("X25519 key generation failed due to blank private key\n");
return false;
}
return true;
}
#endif
void CryptoEngine::clearKeys()
{