2026-08-30 10:53:09 -05:00 | | | //+------------------------------------------------------------------+
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| | | //| DER.mqh |
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| | | //| Copyright 2026, Niquel Mendoza |
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| | | //| https://www.mql5.com |
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| | | //+------------------------------------------------------------------+
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| | | #property copyright "Copyright 2026, Niquel Mendoza"
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| | | #property link "https://www.mql5.com"
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| | | #property strict
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| | |
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| | | #ifndef BIGNUMBERSBYLEO_SRC_UTILS_DER_MQH
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| | | #define BIGNUMBERSBYLEO_SRC_UTILS_DER_MQH
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| | |
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| | | //+------------------------------------------------------------------+
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| | | //| |
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| | | //+------------------------------------------------------------------+
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| | | #include <TSN\\Crypto\\ASN1.mqh>
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| | |
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| | | //+------------------------------------------------------------------+
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| | | //| |
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| | | //+------------------------------------------------------------------+
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| | | namespace TSN
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| | | {
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| | | //+------------------------------------------------------------------+
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| | | //| |
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| | | //+------------------------------------------------------------------+
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| | | class CNumberDERUtils
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| | | {
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| | | public:
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| | | CNumberDERUtils(void) {}
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| | | ~CNumberDERUtils(void) {}
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| | |
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| | | //---
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| | | template <typename TNumber>
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| | | static int DEREstimateLen(const TNumber value, int& k, bool& is_high_encendido, uchar& number_len_size);
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2026-08-30 15:27:01 -05:00 | | |
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| | | //---
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| | | template <typename TNumber>
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| | | static int DERRead(const uchar& buf[], int r, TNumber& value);
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2026-08-30 10:53:09 -05:00 | | | };
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| | |
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| | | //+------------------------------------------------------------------+
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| | | //| Formado DER esta pensado en si |
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| | | //| Para usarse con DerEstimateLen, normalemnte en RSA, etc para |
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| | | //| ASN1 donde se reuqiere (recursion) para el TLV |
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| | | //+------------------------------------------------------------------+
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| | | // TNumber como maximo peude tener para no mparse de 127
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| | | // 126 bytes de tamaño (mas que sobra para long\ulong y hasta structs..)
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| | | //+------------------------------------------------------------------+
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| | | // devuelve tres cosas
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| | | // k=desde donde empiza a escibir
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| | | // is_high_encendido=si el alto esta encneido (para el 0x00)
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| | | // number_len_size=para ponerlo como valor uchar
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| | | template <typename TNumber>
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| | | static int CNumberDERUtils::DEREstimateLen(const TNumber value, int& k, bool& is_high_encendido, uchar& number_len_size)
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| | | {
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| | | const int clz = CBitTricks::CLZ(value);
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| | | k = (((sizeof(TNumber) << 3) - 1) - clz) >> 3; // posicion del byte mas alto con valor
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| | | // calculamos directo el high.. en vez de callear una funcion
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| | | is_high_encendido = (uchar(value >> (k << 3)) & 0x80) != 0;
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| | | // + 1 para normlzliar
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| | | number_len_size = uchar(is_high_encendido + k + 1); //
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| | | // +1 = tag
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| | | // +1 = lensize (Shoft format)
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| | | return number_len_size + 1 + 1;
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| | | }
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| | |
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| | | //+------------------------------------------------------------------+
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| | | // buf= buffer final
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| | | // w= indice de escritura
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| | | // lenw= salida de DERTotalBytes (lenw uchar)
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| | | // total= salida final total de DERTotalBytes
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| | | #define NUMBERUTILS_DER_WRITE_NUMBER(buf, w, VALUE, ttype, is_high_encendido, k, lenw, total) \
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| | | { \
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| | | buf[w++] = CBL_ASN1_TAG_INTEGER; \
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2026-08-30 15:27:01 -05:00 | | | CBL_ASN1_U_WRITELEN(buf, w, lenw, total) \
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2026-08-30 10:53:09 -05:00 | | | TsnValToBytes<ttype> rp; \
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| | | rp.value=VALUE; \
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| | | if(is_high_encendido) \
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| | | buf[w++] = 0x00; \
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| | | for(int i = k; i >= 0; i--) \
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| | | buf[w++] = rp.bytes[i]; \
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| | | }
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| | |
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2026-08-30 15:27:01 -05:00 | | | //+------------------------------------------------------------------+
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| | | //| |
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| | | //+------------------------------------------------------------------+
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| | | template <typename TNumber>
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| | | static int CNumberDERUtils::DERRead(const uchar& buf[], int r, TNumber& value)
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| | | {
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| | | //---
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| | | if(buf[r++] != CBL_ASN1_TAG_INTEGER)
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| | | return -1;
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| | | //---
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| | | int t = buf[r++];
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| | | if((t & CBL_ASN1_MASK_BYTEALTO) != 0)
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| | | return -1; // sool short format
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| | |
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| | | //---
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| | | const int fr = r + t;
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| | | r = fr - 1;
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| | | // aqui no chekamso si la info es buena o mala
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| | | // se supone que ah de coincidor (En caso que no )
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| | | // digmoas t=2, buf=3, entonces requiere 4.. por lo qeu se pasa y da fuera de rango
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| | | // si resulta neceisto se pdora aqui mteer un if
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| | | if(r >= ArraySize(buf)) // invalido
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| | | return -1;
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| | |
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| | | //---
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| | | value = 0;
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| | | for(int j = 0; j < (t << 3); j += 8)
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| | | value |= TNumber(buf[r--]) << j;
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| | |
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| | | //---
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| | | return fr;
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| | | }
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2026-08-30 10:53:09 -05:00 | | |
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| | | //---
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| | | }
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| | | #endif // BIGNUMBERSBYLEO_SRC_UTILS_DER_MQH
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