59 lines
2.2 KiB
Rust
59 lines
2.2 KiB
Rust
extern crate bitcoin;
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use std::str::FromStr;
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use std::{env, process};
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use bitcoin::address::Address;
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use bitcoin::hashes::hex::FromHex;
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use bitcoin::secp256k1::ffi::types::AlignedType;
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use bitcoin::secp256k1::Secp256k1;
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use bitcoin::util::bip32::{ChildNumber, DerivationPath, ExtendedPrivKey, ExtendedPubKey};
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use bitcoin::PublicKey;
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fn main() {
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// This example derives root xprv from a 32-byte seed,
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// derives the child xprv with path m/84h/0h/0h,
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// prints out corresponding xpub,
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// calculates and prints out the first receiving segwit address.
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// Run this example with cargo and seed(hex-encoded) argument:
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// cargo run --example bip32 7934c09359b234e076b9fa5a1abfd38e3dc2a9939745b7cc3c22a48d831d14bd
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let args: Vec<String> = env::args().collect();
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if args.len() < 2 {
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eprintln!("not enough arguments. usage: {} <hex-encoded 32-byte seed>", &args[0]);
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process::exit(1);
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}
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let seed_hex = &args[1];
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println!("Seed: {}", seed_hex);
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// default network as mainnet
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let network = bitcoin::Network::Bitcoin;
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println!("Network: {:?}", network);
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let seed = Vec::from_hex(seed_hex).unwrap();
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// we need secp256k1 context for key derivation
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let mut buf: Vec<AlignedType> = Vec::new();
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buf.resize(Secp256k1::preallocate_size(), AlignedType::zeroed());
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let secp = Secp256k1::preallocated_new(buf.as_mut_slice()).unwrap();
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// calculate root key from seed
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let root = ExtendedPrivKey::new_master(network, &seed).unwrap();
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println!("Root key: {}", root);
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// derive child xpub
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let path = DerivationPath::from_str("m/84h/0h/0h").unwrap();
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let child = root.derive_priv(&secp, &path).unwrap();
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println!("Child at {}: {}", path, child);
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let xpub = ExtendedPubKey::from_priv(&secp, &child);
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println!("Public key at {}: {}", path, xpub);
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// generate first receiving address at m/0/0
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// manually creating indexes this time
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let zero = ChildNumber::from_normal_idx(0).unwrap();
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let public_key = xpub.derive_pub(&secp, &vec![zero, zero]).unwrap().public_key;
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let address = Address::p2wpkh(&PublicKey::new(public_key), network).unwrap();
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println!("First receiving address: {}", address);
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}
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