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refactor to use a common sha1 function

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This commit is contained in:
Will Tatam
2025-11-18 05:53:12 +00:00
parent 4db86ebf7f
commit 85b3c5d91b
3 changed files with 56 additions and 68 deletions
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55
wled00/util.cpp
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@@ -3,6 +3,7 @@
#include "const.h"
#ifdef ESP8266
#include "user_interface.h" // for bootloop detection
#include <Hash.h> // for SHA1 on ESP8266
#else
#include <Update.h>
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 4, 0)
@@ -10,6 +11,7 @@
#elif ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(3, 3, 0)
#include "soc/rtc.h"
#endif
#include "mbedtls/sha1.h" // for SHA1 on ESP32
#endif
@@ -1124,4 +1126,55 @@ uint8_t perlin8(uint16_t x, uint16_t y) {
uint8_t perlin8(uint16_t x, uint16_t y, uint16_t z) {
return (((perlin3D_raw((uint32_t)x << 8, (uint32_t)y << 8, (uint32_t)z << 8, true) * 2015) >> 10) + 33168) >> 8; //scale to 16 bit, offset, then scale to 8bit
}
}
// Platform-agnostic SHA1 computation from String input
String computeSHA1(const String& input) {
#ifdef ESP8266
return sha1(input); // ESP8266 has built-in sha1() function
#else
// ESP32: Compute SHA1 hash using mbedtls
unsigned char shaResult[20]; // SHA1 produces 20 bytes
mbedtls_sha1_context ctx;
mbedtls_sha1_init(&ctx);
mbedtls_sha1_starts_ret(&ctx);
mbedtls_sha1_update_ret(&ctx, (const unsigned char*)input.c_str(), input.length());
mbedtls_sha1_finish_ret(&ctx, shaResult);
mbedtls_sha1_free(&ctx);
// Convert to hexadecimal string
char hexString[41];
for (int i = 0; i < 20; i++) {
sprintf(&hexString[i*2], "%02x", shaResult[i]);
}
hexString[40] = '\0';
return String(hexString);
#endif
}
// Generate a device ID based on SHA1 hash of MAC address salted with "WLED"
// Returns: original SHA1 + last 2 chars of double-hashed SHA1 (42 chars total)
String getDeviceId() {
static String cachedDeviceId = "";
if (cachedDeviceId.length() > 0) return cachedDeviceId;
uint8_t mac[6];
WiFi.macAddress(mac);
char macStr[18];
sprintf(macStr, "%02x:%02x:%02x:%02x:%02x:%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
// First hash: MAC address + "WLED" salt
String macString = String(macStr) + "WLED";
String firstHash = computeSHA1(macString);
// Second hash: SHA1 of the first hash
String secondHash = computeSHA1(firstHash);
// Concatenate first hash + last 2 chars of second hash
cachedDeviceId = firstHash + secondHash.substring(38);
return cachedDeviceId;
}