nucypher_core/
address.rs

1use generic_array::{
2    sequence::Split,
3    typenum::{U12, U20},
4    GenericArray,
5};
6use serde::{Deserialize, Serialize};
7use sha3::{digest::Update, Digest, Keccak256};
8use umbral_pre::{serde_bytes, PublicKey};
9
10// We could use the third-party `ethereum_types::Address` here,
11// but it has an inefficient `serde` implementation (serializes as hex instead of bytes).
12// So for simplicity we just use our own type since we only need the size check.
13// Later a conversion method can be easily defined to/from `ethereum_types::Address`.
14
15/// Represents an Ethereum address (20 bytes).
16#[derive(PartialEq, Debug, Serialize, Deserialize, Copy, Clone, PartialOrd, Eq, Ord)]
17pub struct Address(#[serde(with = "serde_bytes::as_hex")] [u8; Address::SIZE]);
18
19impl Address {
20    /// Size of canonical Ethereum address, in bytes.
21    pub const SIZE: usize = 20;
22
23    /// Creates an address from a fixed-length array.
24    pub fn new(bytes: &[u8; Self::SIZE]) -> Self {
25        Self(*bytes)
26    }
27
28    pub(crate) fn from_public_key(pk: &PublicKey) -> Self {
29        // Canonical address is the last 20 bytes of keccak256 hash
30        // of the uncompressed public key (without the header, so 64 bytes in total).
31        let pk_bytes = pk.to_uncompressed_bytes();
32        let digest = Keccak256::new().chain(&pk_bytes[1..]).finalize();
33
34        let (_prefix, address): (GenericArray<u8, U12>, GenericArray<u8, U20>) = digest.split();
35
36        Self(address.into())
37    }
38}
39
40impl AsRef<[u8]> for Address {
41    fn as_ref(&self) -> &[u8] {
42        self.0.as_ref()
43    }
44}
45
46impl From<Address> for [u8; Address::SIZE] {
47    fn from(address: Address) -> [u8; Address::SIZE] {
48        address.0
49    }
50}
nucypher_core/address.rs

nucypher_core/
address.rs
