device.hpp

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// Copyright (c) 2017-2018, The Monero Project
// 
// All rights reserved.
// 
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// permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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/* Note about debug:
 * To debug Device you can def the following :
 * #define DEBUG_HWDEVICE
 *   Activate debug mechanism:
 *     - Add more trace
 *     - All computation done by device are checked by default device.
 *       Required IODUMMYCRYPT_HWDEVICE or IONOCRYPT_HWDEVICE for fully working
 * #define IODUMMYCRYPT_HWDEVICE 1
 *     - It assumes sensitive data encryption is is off on device side. a XOR with 0x55. This allow Ledger Class to make check on clear value
 * #define IONOCRYPT_HWDEVICE 1
 *     - It assumes sensitive data encryption is off on device side.
 */


#pragma once

#include "crypto/crypto.h"
#include "crypto/chacha.h"
#include "ringct/rctTypes.h"


#ifndef USE_DEVICE_LEDGER
#define USE_DEVICE_LEDGER 1
#endif

#if !defined(HAVE_HIDAPI) 
#undef  USE_DEVICE_LEDGER
#define USE_DEVICE_LEDGER 0
#endif

#if USE_DEVICE_LEDGER
#define WITH_DEVICE_LEDGER
#endif

// forward declaration needed because this header is included by headers in libcryptonote_basic which depends on libdevice
namespace cryptonote
{
    struct account_public_address;
    struct account_keys;
    struct subaddress_index;
}

namespace hw {
    namespace {
        //device funcion not supported
        #define dfns()  \
           throw std::runtime_error(std::string("device function not supported: ")+ std::string(__FUNCTION__) + \
                                    std::string(" (device.hpp line ")+std::to_string(__LINE__)+std::string(").")); \
           return false;
    }

    class device {
    protected:
        std::string  name;

    public:

        device()  {}
        device(const device &hwdev) {}
        virtual ~device()   {}

        explicit virtual operator bool() const = 0;
        enum device_mode {
            NONE,
            TRANSACTION_CREATE_REAL,
            TRANSACTION_CREATE_FAKE,
            TRANSACTION_PARSE
        };
        enum device_type
        {
          SOFTWARE = 0,
          LEDGER = 1
        };


        /* ======================================================================= */
        /*                              SETUP/TEARDOWN                             */
        /* ======================================================================= */
        virtual bool set_name(const std::string &name) = 0;
        virtual const std::string get_name() const = 0;

        virtual  bool init(void) = 0;
        virtual bool release() = 0;

        virtual bool connect(void) = 0;
        virtual bool disconnect(void) = 0;

        virtual bool set_mode(device_mode mode) = 0;

        virtual device_type get_type() const = 0;


        /* ======================================================================= */
        /*  LOCKER                                                                 */
        /* ======================================================================= */ 
        virtual void lock(void) = 0;
        virtual void unlock(void) = 0;
        virtual bool try_lock(void) = 0;


        /* ======================================================================= */
        /*                             WALLET & ADDRESS                            */
        /* ======================================================================= */
        virtual bool  get_public_address(cryptonote::account_public_address &pubkey) = 0;
        virtual bool  get_secret_keys(crypto::secret_key &viewkey , crypto::secret_key &spendkey)  = 0;
        virtual bool  generate_chacha_key(const cryptonote::account_keys &keys, crypto::chacha_key &key, uint64_t kdf_rounds) = 0;

        /* ======================================================================= */
        /*                               SUB ADDRESS                               */
        /* ======================================================================= */
        virtual bool  derive_subaddress_public_key(const crypto::public_key &pub, const crypto::key_derivation &derivation, const std::size_t output_index,  crypto::public_key &derived_pub) = 0;
        virtual crypto::public_key  get_subaddress_spend_public_key(const cryptonote::account_keys& keys, const cryptonote::subaddress_index& index) = 0;
        virtual std::vector<crypto::public_key>  get_subaddress_spend_public_keys(const cryptonote::account_keys &keys, uint32_t account, uint32_t begin, uint32_t end) = 0;
        virtual cryptonote::account_public_address  get_subaddress(const cryptonote::account_keys& keys, const cryptonote::subaddress_index &index) = 0;
        virtual crypto::secret_key  get_subaddress_secret_key(const crypto::secret_key &sec, const cryptonote::subaddress_index &index) = 0;

        /* ======================================================================= */
        /*                            DERIVATION & KEY                             */
        /* ======================================================================= */
        virtual bool  verify_keys(const crypto::secret_key &secret_key, const crypto::public_key &public_key) = 0;
        virtual bool  scalarmultKey(rct::key & aP, const rct::key &P, const rct::key &a) = 0;
        virtual bool  scalarmultBase(rct::key &aG, const rct::key &a) = 0;
        virtual bool  sc_secret_add( crypto::secret_key &r, const crypto::secret_key &a, const crypto::secret_key &b) = 0;
        virtual crypto::secret_key  generate_keys(crypto::public_key &pub, crypto::secret_key &sec, const crypto::secret_key& recovery_key = crypto::secret_key(), bool recover = false) = 0;
        virtual bool  generate_key_derivation(const crypto::public_key &pub, const crypto::secret_key &sec, crypto::key_derivation &derivation) = 0;
        virtual bool  conceal_derivation(crypto::key_derivation &derivation, const crypto::public_key &tx_pub_key, const std::vector<crypto::public_key> &additional_tx_pub_keys, const crypto::key_derivation &main_derivation, const std::vector<crypto::key_derivation> &additional_derivations) = 0;
        virtual bool  derivation_to_scalar(const crypto::key_derivation &derivation, const size_t output_index, crypto::ec_scalar &res) = 0;
        virtual bool  derive_secret_key(const crypto::key_derivation &derivation, const std::size_t output_index, const crypto::secret_key &sec,  crypto::secret_key &derived_sec) = 0;
        virtual bool  derive_public_key(const crypto::key_derivation &derivation, const std::size_t output_index, const crypto::public_key &pub,  crypto::public_key &derived_pub) = 0;
        virtual bool  secret_key_to_public_key(const crypto::secret_key &sec, crypto::public_key &pub) = 0;
        virtual bool  generate_key_image(const crypto::public_key &pub, const crypto::secret_key &sec, crypto::key_image &image) = 0;

        // alternative prototypes available in libringct
        rct::key scalarmultKey(const rct::key &P, const rct::key &a)
        {
            rct::key aP;
            scalarmultKey(aP, P, a);
            return aP;
        }

        rct::key scalarmultBase(const rct::key &a)
        {
            rct::key aG;
            scalarmultBase(aG, a);
            return aG;
        }

        /* ======================================================================= */
        /*                               TRANSACTION                               */
        /* ======================================================================= */

        virtual bool  open_tx(crypto::secret_key &tx_key) = 0;

        virtual bool  encrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key) = 0;
        bool  decrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key)
        {
            // Encryption and decryption are the same operation (xor with a key)
            return encrypt_payment_id(payment_id, public_key, secret_key);
        }

        virtual bool  ecdhEncode(rct::ecdhTuple & unmasked, const rct::key & sharedSec) = 0;
        virtual bool  ecdhDecode(rct::ecdhTuple & masked, const rct::key & sharedSec) = 0;

        virtual bool  add_output_key_mapping(const crypto::public_key &Aout, const crypto::public_key &Bout, const bool is_subaddress, const size_t real_output_index,
                                             const rct::key &amount_key,  const crypto::public_key &out_eph_public_key) = 0;


        virtual bool  mlsag_prehash(const std::string &blob, size_t inputs_size, size_t outputs_size, const rct::keyV &hashes, const rct::ctkeyV &outPk, rct::key &prehash) = 0;
        virtual bool  mlsag_prepare(const rct::key &H, const rct::key &xx, rct::key &a, rct::key &aG, rct::key &aHP, rct::key &rvII) = 0;
        virtual bool  mlsag_prepare(rct::key &a, rct::key &aG) = 0;
        virtual bool  mlsag_hash(const rct::keyV &long_message, rct::key &c) = 0;
        virtual bool  mlsag_sign(const rct::key &c, const rct::keyV &xx, const rct::keyV &alpha, const size_t rows, const size_t dsRows, rct::keyV &ss) = 0;

        virtual bool  close_tx(void) = 0;
    } ;

    struct reset_mode {
        device& hwref;
        reset_mode(hw::device& dev) : hwref(dev) { }
        ~reset_mode() { hwref.set_mode(hw::device::NONE);}
    };

    class device_registry {
    private:
      std::map<std::string, std::unique_ptr<device>> registry;

    public:
      device_registry();
      bool register_device(const std::string & device_name, device * hw_device);
      device& get_device(const std::string & device_descriptor);
    };

    device& get_device(const std::string & device_descriptor);
    bool register_device(const std::string & device_name, device * hw_device);
}