BCW_API hd_public_key hd_public_key::generate_public_key(uint32_t i) const { if (!valid_) return hd_private_key(); if (first_hardened_key <= i) return hd_public_key(); data_chunk data; data.reserve(33 + 4); extend_data(data, K_); extend_data(data, to_big_endian(i)); auto I = split(hmac_sha512_hash(data, to_data_chunk(c_))); // The returned child key Ki is point(parse256(IL)) + Kpar. ec_point Ki = K_; if (!ec_tweak_add(Ki, I.L)) return hd_public_key(); hd_key_lineage lineage { lineage_.testnet, static_cast<uint8_t>(lineage_.depth + 1), fingerprint(), i }; return hd_public_key(Ki, I.R, lineage); }
hd_public_key hd_public_key::generate_public_key(uint32_t i) const { if (!valid_) return hd_private_key(); if (first_hardened_key <= i) return hd_public_key(); auto data = build_data({K_, to_big_endian(i)}); const auto I = split(hmac_sha512_hash(data, c_)); // The returned child key Ki is point(parse256(IL)) + Kpar. ec_point Ki = K_; if (!ec_add(Ki, I.L)) return hd_public_key(); hd_key_lineage lineage { lineage_.testnet, static_cast<uint8_t>(lineage_.depth + 1), fingerprint(), i }; return hd_public_key(Ki, I.R, lineage); }