Method Derive

src/key.cpp:292–309

}

bool CKey::Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) 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, UCharCast(begin()), vout.data());
    }
    memcpy(ccChild.begin(), vout.data()+32, 32);
    keyChild.Set(begin(), begin() + 32, true);
    bool ret = secp256k1_ec_seckey_tweak_add(secp256k1_context_static, (unsigned char*)keyChild.begin(), vout.data());
    if (!ret) keyChild.ClearKeyData();
    return ret;
}

EllSwiftPubKey CKey::EllSwiftCreate(std::span<const std::byte> ent32) const
{