//+------------------------------------------------------------------+
//|                                                         Main.mqh |
//|                                   Copyright 2026, Niquel Mendoza |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, Niquel Mendoza"
#property link      "https://www.mql5.com"
#property strict

#ifndef CRYPTOBYLEO_SRC_MGF1_MAIN_MQH
#define CRYPTOBYLEO_SRC_MGF1_MAIN_MQH

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#include "Def.mqh"

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void MGF1(const uchar& seed[], int seeds, int outl, uchar& outm[], CCryptoHashMeta::ENUM_TSN_CRYPTO_HASH f)
 {
//----
  const int hlen = TSN::CCryptoHashMeta::g_crytpo_hash_meta[f].outl; // tamaño de salida
  const CCryptoHashMeta::TsnCryptoByLeoHashFuncFixed fhash = TSN::CCryptoHashMeta::g_crypto_fhash_fixed[f];

//--- buffer base
  uchar buf[];
  const int bufs = ArrayResize(buf, seeds + 4);
  for(int i = 0; i < seeds; i++)
    buf[i] = seed[i]; // copiamos

//--- buffer del reuslto del hasher
  uchar buf_hash_ou[];
  ArrayResize(buf_hash_ou, hlen);


//---
  uint32_t counter = 0;
  int w = 0; // incide de escrituira

//--- numero de bloques a procesar
  const uint nblocks = uint((outl + (hlen - 1)) / hlen); // ceil..

//--
  for(uint32_t counter = 0; counter < nblocks; counter++)
   {
    // añadimos el contador
    buf[seeds] = uchar(counter >> 24);
    buf[seeds + 1] = uchar(counter >> 16);
    buf[seeds + 2] = uchar(counter >> 8);
    buf[seeds + 3] = uchar(counter);

    // aplicamos hasher
    fhash(buf, bufs, buf_hash_ou);

    // truncamos si hace falta (en caso sobrepase solo tomaoms lo necsario)
    const int chunk = (w + hlen > outl) ? (outl - w) : hlen;

    // copiamos datos
    for(int i = 0; i < chunk; i++)
      outm[w + i] = buf_hash_ou[i];

    // aumentamos
    w += chunk;
   }
 }
}
//+------------------------------------------------------------------+
#endif // CRYPTOBYLEO_SRC_MGF1_MAIN_MQH