device_default.cpp

// 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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//    of conditions and the following disclaimer in the documentation and/or other
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#include "device_default.hpp"
#include "common/int-util.h"
#include "cryptonote_basic/account.h"
#include "cryptonote_basic/subaddress_index.h"
#include "ringct/rctOps.h"

#define ENCRYPTED_PAYMENT_ID_TAIL 0x8d
#define CHACHA8_KEY_TAIL 0x8c

namespace hw {

    namespace core {

        device_default::device_default() { }

        device_default::~device_default() { }

        /* ===================================================================== */
        /* ===                        Misc                                ==== */
        /* ===================================================================== */
        static inline unsigned char *operator &(crypto::ec_scalar &scalar) {
            return &reinterpret_cast<unsigned char &>(scalar);
        }
        static inline const unsigned char *operator &(const crypto::ec_scalar &scalar) {
            return &reinterpret_cast<const unsigned char &>(scalar);
        }

        /* ======================================================================= */
        /*                              SETUP/TEARDOWN                             */
        /* ======================================================================= */
        bool device_default::set_name(const std::string &name)  {
            this->name = name;
            return true;
        }
        const std::string device_default::get_name()  const {
            return this->name;
        }
        
        bool device_default::init(void) {
            return true;
        }
        bool device_default::release() {
            return true;
        }

        bool device_default::connect(void) {
            return true;
        }
        bool device_default::disconnect() {
            return true;
        }

        bool  device_default::set_mode(device_mode mode) {
            return device::set_mode(mode);
        }

        /* ======================================================================= */
        /*  LOCKER                                                                 */
        /* ======================================================================= */ 
    
        void device_default::lock() { }

        bool device_default::try_lock() { return true; }

        void device_default::unlock() { }

        /* ======================================================================= */
        /*                             WALLET & ADDRESS                            */
        /* ======================================================================= */

        bool  device_default::generate_chacha_key(const cryptonote::account_keys &keys, crypto::chacha_key &key, uint64_t kdf_rounds) {
            const crypto::secret_key &view_key = keys.m_view_secret_key;
            const crypto::secret_key &spend_key = keys.m_spend_secret_key;
            epee::mlocked<tools::scrubbed_arr<char, sizeof(view_key) + sizeof(spend_key) + 1>> data;
            memcpy(data.data(), &view_key, sizeof(view_key));
            memcpy(data.data() + sizeof(view_key), &spend_key, sizeof(spend_key));
            data[sizeof(data) - 1] = CHACHA8_KEY_TAIL;
            crypto::generate_chacha_key(data.data(), sizeof(data), key, kdf_rounds);
            return true;
        }
        bool  device_default::get_public_address(cryptonote::account_public_address &pubkey) {
             dfns();
        }
        bool  device_default::get_secret_keys(crypto::secret_key &viewkey , crypto::secret_key &spendkey)  {
             dfns();
        }
        /* ======================================================================= */
        /*                               SUB ADDRESS                               */
        /* ======================================================================= */

        bool device_default::derive_subaddress_public_key(const crypto::public_key &out_key, const crypto::key_derivation &derivation, const std::size_t output_index, crypto::public_key &derived_key) {
            return crypto::derive_subaddress_public_key(out_key, derivation, output_index,derived_key);
        }

        crypto::public_key device_default::get_subaddress_spend_public_key(const cryptonote::account_keys& keys, const cryptonote::subaddress_index &index) {
            if (index.is_zero())
              return keys.m_account_address.m_spend_public_key;

            // m = Hs(a || index_major || index_minor)
            crypto::secret_key m = get_subaddress_secret_key(keys.m_view_secret_key, index);

            // M = m*G
            crypto::public_key M;
            crypto::secret_key_to_public_key(m, M);

            // D = B + M
            crypto::public_key D = rct::rct2pk(rct::addKeys(rct::pk2rct(keys.m_account_address.m_spend_public_key), rct::pk2rct(M)));
            return D;
        }

        std::vector<crypto::public_key>  device_default::get_subaddress_spend_public_keys(const cryptonote::account_keys &keys, uint32_t account, uint32_t begin, uint32_t end) {
            CHECK_AND_ASSERT_THROW_MES(begin <= end, "begin > end");

            std::vector<crypto::public_key> pkeys;
            pkeys.reserve(end - begin);
            cryptonote::subaddress_index index = {account, begin};

            ge_p3 p3;
            ge_cached cached;
            CHECK_AND_ASSERT_THROW_MES(ge_frombytes_vartime(&p3, (const unsigned char*)keys.m_account_address.m_spend_public_key.data) == 0,
                "ge_frombytes_vartime failed to convert spend public key");
            ge_p3_to_cached(&cached, &p3);

            for (uint32_t idx = begin; idx < end; ++idx)
            {
                index.minor = idx;
                if (index.is_zero())
                {
                    pkeys.push_back(keys.m_account_address.m_spend_public_key);
                    continue;
                }
                crypto::secret_key m = get_subaddress_secret_key(keys.m_view_secret_key, index);

                // M = m*G
                ge_scalarmult_base(&p3, (const unsigned char*)m.data);

                // D = B + M
                crypto::public_key D;
                ge_p1p1 p1p1;
                ge_add(&p1p1, &p3, &cached);
                ge_p1p1_to_p3(&p3, &p1p1);
                ge_p3_tobytes((unsigned char*)D.data, &p3);

                pkeys.push_back(D);
            }
            return pkeys;
        }

        cryptonote::account_public_address device_default::get_subaddress(const cryptonote::account_keys& keys, const cryptonote::subaddress_index &index) {
            if (index.is_zero())
              return keys.m_account_address;

            crypto::public_key D = get_subaddress_spend_public_key(keys, index);

            // C = a*D
            crypto::public_key C = rct::rct2pk(rct::scalarmultKey(rct::pk2rct(D), rct::sk2rct(keys.m_view_secret_key)));

            // result: (C, D)
            cryptonote::account_public_address address;
            address.m_view_public_key  = C;
            address.m_spend_public_key = D;
            return address;
        }

        crypto::secret_key  device_default::get_subaddress_secret_key(const crypto::secret_key &a, const cryptonote::subaddress_index &index) {
            const char prefix[] = "SubAddr";
            char data[sizeof(prefix) + sizeof(crypto::secret_key) + 2 * sizeof(uint32_t)];
            memcpy(data, prefix, sizeof(prefix));
            memcpy(data + sizeof(prefix), &a, sizeof(crypto::secret_key));
            uint32_t idx = SWAP32LE(index.major);
            memcpy(data + sizeof(prefix) + sizeof(crypto::secret_key), &idx, sizeof(uint32_t));
            idx = SWAP32LE(index.minor);
            memcpy(data + sizeof(prefix) + sizeof(crypto::secret_key) + sizeof(uint32_t), &idx, sizeof(uint32_t));
            crypto::secret_key m;
            crypto::hash_to_scalar(data, sizeof(data), m);
            return m;
        }

        /* ======================================================================= */
        /*                            DERIVATION & KEY                             */
        /* ======================================================================= */

        bool  device_default::verify_keys(const crypto::secret_key &secret_key, const crypto::public_key &public_key) {
            crypto::public_key calculated_pub;
            bool r = crypto::secret_key_to_public_key(secret_key, calculated_pub);
            return r && public_key == calculated_pub;
        }

        bool device_default::scalarmultKey(rct::key & aP, const rct::key &P, const rct::key &a) {
            rct::scalarmultKey(aP, P,a);
            return true;
        }

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

        bool device_default::sc_secret_add(crypto::secret_key &r, const crypto::secret_key &a, const crypto::secret_key &b) {
            sc_add(&r, &a, &b);
            return true;
        }

        crypto::secret_key  device_default::generate_keys(crypto::public_key &pub, crypto::secret_key &sec, const crypto::secret_key& recovery_key, bool recover) {
            return crypto::generate_keys(pub, sec, recovery_key, recover);
        }

        bool device_default::generate_key_derivation(const crypto::public_key &key1, const crypto::secret_key &key2, crypto::key_derivation &derivation) {
            return crypto::generate_key_derivation(key1, key2, derivation);
        }

        bool device_default::derivation_to_scalar(const crypto::key_derivation &derivation, const size_t output_index, crypto::ec_scalar &res){
            crypto::derivation_to_scalar(derivation,output_index, res);
            return true;
        }

        bool device_default::derive_secret_key(const crypto::key_derivation &derivation, const std::size_t output_index, const crypto::secret_key &base, crypto::secret_key &derived_key){
            crypto::derive_secret_key(derivation, output_index, base, derived_key);
            return true;
        }

        bool device_default::derive_public_key(const crypto::key_derivation &derivation, const std::size_t output_index, const crypto::public_key &base, crypto::public_key &derived_key){
            return crypto::derive_public_key(derivation, output_index, base, derived_key);
        }

        bool device_default::secret_key_to_public_key(const crypto::secret_key &sec, crypto::public_key &pub) {
            return crypto::secret_key_to_public_key(sec,pub);
        }

        bool device_default::generate_key_image(const crypto::public_key &pub, const crypto::secret_key &sec, crypto::key_image &image){
            crypto::generate_key_image(pub, sec,image);
            return true;
        }

        bool device_default::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){
            return true;
        }

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

        bool device_default::open_tx(crypto::secret_key &tx_key) {
            cryptonote::keypair txkey = cryptonote::keypair::generate(*this);
            tx_key = txkey.sec;
            return true;
        }


        bool device_default::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)  {
            return true;
        }

        bool  device_default::encrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key) {
            crypto::key_derivation derivation;
            crypto::hash hash;
            char data[33]; /* A hash, and an extra byte */

            if (!generate_key_derivation(public_key, secret_key, derivation))
                return false;

            memcpy(data, &derivation, 32);
            data[32] = ENCRYPTED_PAYMENT_ID_TAIL;
            cn_fast_hash(data, 33, hash);

            for (size_t b = 0; b < 8; ++b)
                payment_id.data[b] ^= hash.data[b];

            return true;
        }

        bool  device_default::ecdhEncode(rct::ecdhTuple & unmasked, const rct::key & sharedSec) {
            rct::ecdhEncode(unmasked, sharedSec);
            return true;
        }

        bool  device_default::ecdhDecode(rct::ecdhTuple & masked, const rct::key & sharedSec) {
            rct::ecdhDecode(masked, sharedSec);
            return true;
        }

        bool device_default::mlsag_prepare(const rct::key &H, const rct::key &xx,
                                         rct::key &a, rct::key &aG, rct::key &aHP, rct::key &II) {
            rct::skpkGen(a, aG);
            rct::scalarmultKey(aHP, H, a);
            rct::scalarmultKey(II, H, xx);
            return true;
        }
        bool  device_default::mlsag_prepare(rct::key &a, rct::key &aG) {
            rct::skpkGen(a, aG);
            return true;
        }
        bool  device_default::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) {
            prehash = rct::cn_fast_hash(hashes);
            return true;
        }


        bool device_default::mlsag_hash(const rct::keyV &toHash, rct::key &c_old) {
            c_old = rct::hash_to_scalar(toHash);
            return true;
        }

        bool device_default::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 ) {
            CHECK_AND_ASSERT_THROW_MES(dsRows<=rows, "dsRows greater than rows");
            CHECK_AND_ASSERT_THROW_MES(xx.size() == rows, "xx size does not match rows");
            CHECK_AND_ASSERT_THROW_MES(alpha.size() == rows, "alpha size does not match rows");
            CHECK_AND_ASSERT_THROW_MES(ss.size() == rows, "ss size does not match rows");
            for (size_t j = 0; j < rows; j++) {
                sc_mulsub(ss[j].bytes, c.bytes, xx[j].bytes, alpha[j].bytes);
            }
            return true;
        }

        bool device_default::close_tx() {
            return true;
        }


        /* ---------------------------------------------------------- */
        static device_default *default_core_device = NULL;
        void register_all(std::map<std::string, std::unique_ptr<device>> &registry) {
            if (!default_core_device) {
                default_core_device = new device_default();
                default_core_device->set_name("default_core_device");

            }
            registry.insert(std::make_pair("default", std::unique_ptr<device>(default_core_device)));
        }


    }

}