Common structures and utilities to operate HD Path defined by Bitcoin's BIP-32 standard.

The main specification for the Hierarchical Deterministic Wallets is BIP-32, and HD Path is a part of it which specifies the format for the hierarchy path.

The crate doesn't try to implement Key Derivation specification, but instead implements all common functionality for creating, parsing and displaying an HD Path, especially standard paths defined by BIP-44 and related.

The common structure, defined by BIP-43, is m/purpose'/coin_type'/account'/change/address_index, for example m/44'/0'/0'/0/0

All supported standards:

• BIP-32
• BIP-43
• BIP-44
• BIP-49
• BIP-84

Examples

Basic usage

```rust use hdpath::StandardHDPath; use std::str::FromStr;

let hdpath = StandardHDPath::fromstr("m/44'/0'/0'/0/0").unwrap(); // prints "m/44'/0'/0'/0/0" println!("{:?}", hd_path);

// prints "0", which is account id println!("{:?}", hd_path.account());

// prints: "purpose: Pubkey, coin: 0, account: 0, change: 0, index: 0" println!("purpose: {:?}, coin: {}, account: {}, change: {}, index: {}", hdpath.purpose(), hdpath.cointype(), hdpath.account(), hdpath.change(), hdpath.index()) ```

Create from values

```rust use hdpath::{StandardHDPath, Purpose};

let hdpath = StandardHDPath::new(Purpose::Witness, 0, 1, 0, 101); // prints "m/84'/0'/1'/0/101" println!("{:?}", hdpath); ```

Create account and derive addresses

```rust use hdpath::{AccountHDPath, StandardHDPath, Purpose};

let hdaccount = AccountHDPath::new(Purpose::Witness, 0, 1); // prints "m/44'/0'/1'/x/x" println!("{:?}", hdaccount);

// get actual address on the account path. Returns StandardHDPath let hdpath = hdaccount.address_at(0, 7);

//prints: "m/44'/0'/1'/0/7" println!("{:?}", hd_path); ```

Verify before create

Please note that values for HD Path are limited to 2^31-1 because the highest bit is reserved for marking a hardened value. Therefore, if you're getting individual values from some user input, you should verify the value before passing to ::new. Otherwise the constructor may fail with panic if an invalid value was passed.

```rust use hdpath::{StandardHDPath, PathValue, Purpose};

fn userpath(index: u32) -> Resultid = 1234 as u32; if PathValue::isok(index) { Ok(StandardHDPath::new(Purpose::Witness, 0, userid, 0, index)) } else { Err(()) } } ```