ArduinoCryptoProvider.h

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/*
 * SPDX-License-Identifier: LGPL-3.0-or-later
 * Copyright (c) 2026 Cryptnox SA
 */

 
#ifndef ARDUINOCRYPTOPROVIDER_H
#define ARDUINOCRYPTOPROVIDER_H
 
#include <Arduino.h>
#include <uECC.h>
#include "cryptnox-sdk-cpp/CW_CryptoProvider.h"
#include "AESLib.h"

class ArduinoCryptoProvider : public CW_CryptoProvider {
public:
    ArduinoCryptoProvider();
 
    ArduinoCryptoProvider(const ArduinoCryptoProvider&) = delete;
    ArduinoCryptoProvider& operator=(const ArduinoCryptoProvider&) = delete;


    bool sha256(const uint8_t* data, size_t len, uint8_t* out) override;

    bool sha512(const uint8_t* data, size_t len, uint8_t* out) override;

    uint16_t aesCbcEncrypt(const uint8_t* in, uint16_t len, uint8_t* out,
                           const uint8_t* key, uint8_t keyLen,
                           uint8_t* iv, bool bitPadding) override;

    uint16_t aesCbcDecrypt(uint8_t* in, uint16_t len, uint8_t* out,
                           const uint8_t* key, uint8_t keyLen,
                           uint8_t* iv, bool bitPadding) override;

    bool ecdh(const uint8_t* pubKey, const uint8_t* privKey,
              uint8_t* secret, CW_Curve curve) override;

    bool makeKey(uint8_t* pubKey, uint8_t* privKey,
                 CW_Curve curve) override;

    bool random(uint8_t* dest, unsigned size) override;

    bool ecdsaVerify(const uint8_t* pubKey64,
                     const uint8_t* hash, size_t hashLen,
                     const uint8_t* sig, CW_Curve curve) override;
 
private:
    AESLib _aes; 

    static const uECC_Curve_t* toUEccCurve(CW_Curve curve);

    static uint8_t trngByte();

    static int trngCallback(uint8_t* dest, unsigned size);
};
 
#endif // ARDUINOCRYPTOPROVIDER_H