Implement interfaces for ESP32

src/crypto/ESP32CryptoSource.cpp

@@ -0,0 +1,29 @@
+#include "interface/ESP32CryptoSource.h"
+
+#include <Ed25519.h>
+#include <RNG.h>
+#include <NoiseSource.h>
+
+ESP32CryptoSource::ESP32CryptoSource(const char* rngInitTag) {
+    RNG.begin(rngInitTag);
+    RNG.addNoiseSource(noise);
+}
+
+bool ESP32CryptoSource::createPrivateKey(PrivateKey* key) {
+    Ed25519::generatePrivateKey(key->bytes);
+    return true;
+}
+
+bool ESP32CryptoSource::createPublicKey(const PrivateKey* privateKey, PublicKey* publicKey) {
+    Ed25519::derivePublicKey(publicKey->bytes, privateKey->bytes);
+    return true;
+} 
+
+bool ESP32CryptoSource::sign(const uint8_t *message, uint16_t length, Signature* signature, const PrivateKey* privateKey, const PublicKey* publicKey) {
+    Ed25519::sign(signature->bytes, privateKey->bytes, publicKey->bytes, message, length);
+    return true;
+}
+
+bool ESP32CryptoSource::verify(const Signature* signature, const PublicKey* publicKey, const void *message, uint16_t length) {
+    return Ed25519::verify(signature->bytes, publicKey->bytes, message, length);
+}

src/crypto/ESP32NoiseSource.cpp

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+#include "interface/ESP32NoiseSource.h"
+
+#include <esp_random.h>
+#include <bootloader_random.h>
+
+ESP32NoiseSource::ESP32NoiseSource() {
+    // Ensure that there is randomness even if Bluetooth and WiFi are disabled
+    bootloader_random_enable();
+}
+
+bool ESP32NoiseSource::calibrating() const {
+    return false;
+}
+
+void ESP32NoiseSource::stir() {
+    esp_fill_random(data, randomNumberBatchSize);
+    output(data, randomNumberBatchSize, randomNumberBatchSize * 8);
+}

src/crypto/ESP32StorageSource.cpp

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+#include "interface/ESP32StorageSource.h"
+#include <EEPROM.h>
+
+bool ESP32StorageSource::writeByteAtIndex(uint8_t byte, uint16_t index) {
+    // TODO: What does return value mean?
+    EEPROM.writeByte((int) index, byte);
+    return true;
+}
+
+bool ESP32StorageSource::canProvideStorageWithSize(uint16_t size) {
+    return EEPROM.begin(size);
+}
+
+bool ESP32StorageSource::commitData() {
+    return EEPROM.commit();
+} 
+
+uint8_t ESP32StorageSource::readByteAtIndex(uint16_t index) {
+    return EEPROM.readByte((int) index);
+}
+
+uint16_t ESP32StorageSource::readBytes(uint16_t startIndex, uint16_t count, uint8_t* output) {
+    return EEPROM.readBytes(startIndex, output, count);
+}
+
+uint16_t ESP32StorageSource::writeBytes(uint8_t* bytes, uint16_t count, uint16_t startIndex) {
+    return EEPROM.writeBytes(startIndex, bytes, count);
+}