iop_keyvault/
cc.rs

1use super::*;
2
3/// Size of the chain code in bytes
4pub const CHAIN_CODE_SIZE: usize = 32;
5
6/// Chain code for key derivation in extended private and public keys.
7/// This is a 256-bit secret key that is completely independent of the private
8/// key and is used as an extension to the cryptographic domain, basically an
9/// extra state during iteration.
10#[derive(Clone)]
11pub struct ChainCode([u8; CHAIN_CODE_SIZE]);
12
13impl ChainCode {
14    /// The chain code serialized in a format that can be fed to [`from_bytes`]
15    ///
16    /// [`from_bytes`]: #method.from_bytes
17    pub fn to_bytes(&self) -> [u8; CHAIN_CODE_SIZE] {
18        self.0
19    }
20
21    /// Creates a chain code from a byte slice possibly returned by the [`to_bytes`] method.
22    ///
23    /// # Error
24    /// If `bytes` is not [`CHAIN_CODE_SIZE`] long
25    ///
26    /// [`to_bytes`]: #method.to_bytes
27    /// [`CHAIN_CODE_SIZE`]: ../constant.CHAIN_CODE_SIZE
28    pub fn from_bytes<D: AsRef<[u8]>>(bytes: D) -> Result<Self> {
29        let bytes = bytes.as_ref();
30        ensure! {
31            bytes.len() == CHAIN_CODE_SIZE,
32            "Chain code length is not {}",
33            CHAIN_CODE_SIZE
34        }
35        let mut cc = [0u8; CHAIN_CODE_SIZE];
36        cc.copy_from_slice(bytes);
37        Ok(Self(cc))
38    }
39}
iop_keyvault/cc.rs

iop_keyvault/
cc.rs
