kobe_core/
derive.rs

1//! Unified derivation trait and account type.
2//!
3//! All chain-specific derivers implement [`Derive`], providing a consistent
4//! API surface across chains. [`DeriveExt`] is automatically implemented for
5//! all `Derive` types, providing batch derivation via [`derive_many`](DeriveExt::derive_many).
6
7use alloc::string::String;
8use alloc::vec::Vec;
9
10use zeroize::Zeroizing;
11
12use crate::Error;
13
14/// A derived account from any chain.
15///
16/// Contains the derivation path, key material, and on-chain address.
17/// The private key is zeroized on drop.
18#[derive(Debug, Clone)]
19#[non_exhaustive]
20pub struct DerivedAccount {
21    /// BIP-32/SLIP-10 derivation path used (e.g. `m/44'/60'/0'/0/0`).
22    pub path: String,
23    /// Private key in hex (zeroized on drop).
24    pub private_key: Zeroizing<String>,
25    /// Public key in hex.
26    pub public_key: String,
27    /// On-chain address in the chain's native format.
28    pub address: String,
29}
30
31impl DerivedAccount {
32    /// Create a new derived account.
33    #[must_use]
34    pub const fn new(
35        path: String,
36        private_key: Zeroizing<String>,
37        public_key: String,
38        address: String,
39    ) -> Self {
40        Self {
41            path,
42            private_key,
43            public_key,
44            address,
45        }
46    }
47}
48
49/// Unified derivation trait implemented by all chain derivers.
50///
51/// Provides a consistent API for deriving accounts regardless of the
52/// underlying chain. Each chain crate (`kobe-evm`, `kobe-btc`, etc.)
53/// implements this trait on its `Deriver` type.
54///
55/// Batch derivation is provided by the blanket [`DeriveExt`] trait.
56///
57/// # Example
58///
59/// ```ignore
60/// use kobe::{Derive, DeriveExt};
61///
62/// fn derive_first_account(d: &impl Derive) -> kobe::DerivedAccount {
63///     d.derive(0).unwrap()
64/// }
65/// ```
66pub trait Derive {
67    /// The error type returned by derivation operations.
68    type Error: core::fmt::Debug + core::fmt::Display + From<Error>;
69
70    /// Derive an account at the given index using the chain's default path.
71    fn derive(&self, index: u32) -> Result<DerivedAccount, Self::Error>;
72
73    /// Derive an account at a custom path string.
74    fn derive_path(&self, path: &str) -> Result<DerivedAccount, Self::Error>;
75}
76
77/// Extension trait providing batch derivation for all [`Derive`] implementors.
78///
79/// This trait is automatically implemented for any type implementing `Derive`.
80pub trait DeriveExt: Derive {
81    /// Derive `count` accounts starting at index `start`.
82    ///
83    /// # Errors
84    ///
85    /// Returns [`Error::IndexOverflow`] if `start + count` overflows `u32`.
86    fn derive_many(&self, start: u32, count: u32) -> Result<Vec<DerivedAccount>, Self::Error> {
87        let end = start.checked_add(count).ok_or(Error::IndexOverflow)?;
88        (start..end).map(|i| self.derive(i)).collect()
89    }
90}
91
92impl<T: Derive> DeriveExt for T {}
kobe_core/derive.rs

kobe_core/
derive.rs
