Method Derive

src/key.cpp:325–347

}

bool CKey::Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc, std::vector<unsigned char>* tweak) const {
    assert(IsValid());
    assert(IsCompressed());
    std::vector<unsigned char, secure_allocator<unsigned char>> vout(64);
    if ((nChild >> 31) == 0) {
        CPubKey pubkey = GetPubKey();
        assert(pubkey.size() == CPubKey::COMPRESSED_SIZE);
        BIP32Hash(cc, nChild, *pubkey.begin(), pubkey.begin()+1, vout.data());
    } else {
        assert(size() == 32);
        BIP32Hash(cc, nChild, 0, begin(), vout.data());
    }
    if (tweak) {
        tweak->clear();
        *tweak = std::vector<unsigned char>(vout.data(), vout.data()+32);
    }
    memcpy(ccChild.begin(), vout.data()+32, 32);
    memcpy((unsigned char*)keyChild.begin(), begin(), 32);
    bool ret = secp256k1_ec_seckey_tweak_add(secp256k1_context_sign, (unsigned char*)keyChild.begin(), vout.data());
    keyChild.fCompressed = true;
    keyChild.fValid = ret;
    return ret;
}

bool CExtKey::Derive(CExtKey &out, unsigned int _nChild) const {
    out.nDepth = nDepth + 1;