//+------------------------------------------------------------------+
//|                                                          Def.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_SIMETRIC_CHACHA20_DEF_MQH
#define CRYPTOBYLEO_SRC_SIMETRIC_CHACHA20_DEF_MQH

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
// s = state
// b = bytes
#define CHACHA20_KEYSIZEB           (32)
#define CHACHA20_STATE_S            (16)
#define CHACHA20_KEYSTREAM_SIZEB    (64)
// tamaño para uint32_t (para bytes compeltos el tamaño de key strema de es de 64) para u32 es de16 
#define CHACHA20_KEYSTREAM_SIZE_U32 (16)
#define CHACHA20_IVNONE_B           (12)
#define CHACHA20_STATE_IDX_CNT      (12)

//---- Macro de utildiades
// rotacion a la izuqirda 32
#define CHACHA20_ROT32L(x, n)  ((x << n) | (x >> (32 - n)))

//--- Macro base del algoritmo la funcion QR
#define CHACHA20_QR(a, b, c, d)                     \
        a += b; d ^= a; d = CHACHA20_ROT32L(d, 16); \
        c += d; b ^= c; b = CHACHA20_ROT32L(b, 12); \
        a += b; d ^= a; d = CHACHA20_ROT32L(d, 8);  \
        c += d; b ^= c; b = CHACHA20_ROT32L(b, 7);

//---- Macro que eqvuila a una ronda completa..
// ¿Aplicamos en columnas luego en diagnoleas..
#define CHACHA20_DOUBLE_ROUND                   \
            CHACHA20_QR(x0, x4, x8,  x12)       \
            CHACHA20_QR(x1, x5, x9,  x13)       \
            CHACHA20_QR(x2, x6, x10, x14)       \
            CHACHA20_QR(x3, x7, x11, x15)       \
            CHACHA20_QR(x0, x5, x10, x15)       \
            CHACHA20_QR(x1, x6, x11, x12)       \
            CHACHA20_QR(x2, x7, x8,  x13)       \
            CHACHA20_QR(x3, x4, x9,  x14)


}
//+------------------------------------------------------------------+
#endif // CRYPTOBYLEO_SRC_SIMETRIC_CHACHA20_DEF_MQH