// Copyright © 2017-2020 Trust Wallet.

//

// This file is part of Trust. The full Trust copyright notice, including

// terms governing use, modification, and redistribution, is contained in the

// file LICENSE at the root of the source code distribution tree.

#include "Signer.h"

#include "../Hash.h"

using namespace TW;

using namespace TW::VeChain;

Proto::SigningOutput Signer::sign(const Proto::SigningInput& input) noexcept {

auto key = PrivateKey(Data(input.private_key().begin(), input.private_key().end()));

auto transaction = Transaction();

transaction.chainTag = static_cast<uint8_t>(input.chain_tag());

transaction.blockRef = input.block_ref();

transaction.expiration = input.expiration();

for (auto& clause : input.clauses()) {

transaction.clauses.emplace_back(clause);

}

transaction.gasPriceCoef = static_cast<uint8_t>(input.gas_price_coef());

transaction.gas = input.gas();

transaction.dependsOn = Data(input.depends_on().begin(), input.depends_on().end());

transaction.nonce = input.nonce();

transaction.signature = sign(key, transaction);

auto protoOutput = Proto::SigningOutput();

auto encoded = transaction.encode();

protoOutput.set_encoded(encoded.data(), encoded.size());

protoOutput.set_signature(transaction.signature.data(), transaction.signature.size());

return protoOutput;

}

Data Signer::sign(const PrivateKey& privateKey, Transaction& transaction) noexcept {

auto encoded = transaction.encode();

auto hash = Hash::blake2b(encoded, 32);

auto signature = privateKey.sign(hash, TWCurveSECP256k1);

return Data(signature.begin(), signature.end());

}