Method DeriveNewChildKey

src/wallet.cpp:183–243

}

void CWallet::DeriveNewChildKey(const CKeyMetadata& metadata, CKey& secretRet, uint32_t nAccountIndex, bool internal)
{
    CHDChain hdChainTmp;
    if (!GetHDChain(hdChainTmp)) {
        throw std::runtime_error(std::string(__func__) + ": GetHDChain failed");
    }

    if (!DecryptHDChain(hdChainTmp))
        throw std::runtime_error(std::string(__func__) + ": DecryptHDChainSeed failed");
    // make sure seed matches this chain
    if (hdChainTmp.GetID() != hdChainTmp.GetSeedHash())
        throw std::runtime_error(std::string(__func__) + ": Wrong HD chain!");

    CHDAccount acc;
    if (!hdChainTmp.GetAccount(nAccountIndex, acc))
        throw std::runtime_error(std::string(__func__) + ": Wrong HD account!");

    // derive child key at next index, skip keys already known to the wallet
    CExtKey childKey;
    uint32_t nChildIndex = internal ? acc.nInternalChainCounter : acc.nExternalChainCounter;
    do {
        hdChainTmp.DeriveChildExtKey(nAccountIndex, internal, nChildIndex, childKey);
        // increment childkey index
        nChildIndex++;
    } while (HaveKey(childKey.key.GetPubKey().GetID()));
    secretRet = childKey.key;

    CPubKey pubkey = secretRet.GetPubKey();
    assert(secretRet.VerifyPubKey(pubkey));

    // store metadata
    mapKeyMetadata[pubkey.GetID()] = metadata;
    if (!nTimeFirstKey || metadata.nCreateTime < nTimeFirstKey)
        nTimeFirstKey = metadata.nCreateTime;

    // update the chain model in the database
    CHDChain hdChainCurrent;
    GetHDChain(hdChainCurrent);

    if (internal) {
        acc.nInternalChainCounter = nChildIndex;
    }
    else {
        acc.nExternalChainCounter = nChildIndex;
    }

    if (!hdChainCurrent.SetAccount(nAccountIndex, acc))
        throw std::runtime_error(std::string(__func__) + ": SetAccount failed");

    if (IsCrypted()) {
        if (!SetCryptedHDChain(hdChainCurrent, false))
            throw std::runtime_error(std::string(__func__) + ": SetCryptedHDChain failed");
    }
    else {
        if (!SetHDChain(hdChainCurrent, false))
            throw std::runtime_error(std::string(__func__) + ": SetHDChain failed");
    }