/*

   ____  __  __  ____  _  _  _____       ___  _____  ____  _  _ 
  (  _ \(  )(  )(_  _)( \( )(  _  )___  / __)(  _  )(_  _)( \( )
   )(_) ))(__)(  _)(_  )  (  )(_)((___)( (__  )(_)(  _)(_  )  ( 
  (____/(______)(____)(_)\_)(_____)     \___)(_____)(____)(_)\_)
  Official code for Arduino boards (and relatives)   version 4.3
  
  Duino-Coin Team & Community 2019-2026  MIT Licensed
  https://duinocoin.com
  https://github.com/revoxhere/duino-coin
  If you don't know where to start, visit official website and navigate to
  the Getting Started page. Have fun mining!
*/

/* For microcontrollers with low memory change that to -Os in all files,
for default settings use -O0. -O may be a good tradeoff between both */
#pragma GCC optimize ("-Ofast")
/* For microcontrollers with custom LED pins, adjust the line below */
#ifndef LED_BUILTIN
#define LED_BUILTIN 13
#endif
#define SEP_TOKEN ","
#define END_TOKEN "\n"
/* For 8-bit microcontrollers we should use 16 bit variables since the
difficulty is low, for all the other cases should be 32 bits. */
#if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
typedef uint32_t uintDiff;
#else
typedef uint32_t uintDiff;
#endif
// Arduino identifier library - https://github.com/ricaun
#include "uniqueID.h"

#include "duco_hash.h"

String get_DUCOID() {
  String ID = "DUCOID";
  char buff[4];
  for (size_t i = 0; i < 8; i++) {
    sprintf(buff, "%02X", (uint8_t)UniqueID8[i]);
    ID += buff;
  }
  return ID;
}

String DUCOID = "";

void setup() {
  // Prepare built-in led pin as output
  pinMode(LED_BUILTIN, OUTPUT);
  DUCOID = get_DUCOID();
  // Open serial port
  Serial.begin(115200);
  Serial.setTimeout(10000);
  while (!Serial)
    ;  // For Arduino Leonardo or any board with the ATmega32U4
  Serial.flush();
}

void lowercase_hex_to_bytes(char const * hexDigest, uint8_t * rawDigest) {
  for (uint8_t i = 0, j = 0; j < SHA1_HASH_LEN; i += 2, j += 1) {
    uint8_t x = hexDigest[i];
    uint8_t b = x >> 6;
    uint8_t r = ((x & 0xf) | (b > 6;

    rawDigest[j] = (r