CACAOs

CACAOs is a Rust library implementing the CAIP-74 Chain-Agnostic Object Capability Specification, with built in support for Sign In With Ethereum.

Example

A simple example using SIWE-type CACAOs:

use cacaos::{Payload, BasicSignature, cacao_siwe::SignInWithEthereum, SignatureScheme};
use hex::FromHex;
use siwe::Message;
use std::str::FromStr;
use libipld::{codec::Encode, cbor::DagCborCodec, multihash::Code, Block};

let message: Payload = Message::from_str(
r#"localhost:4361 wants you to sign in with your Ethereum account:
0x6Da01670d8fc844e736095918bbE11fE8D564163

SIWE Notepad Example

URI: http://localhost:4361
Version: 1
Chain ID: 1
Nonce: kEWepMt9knR6lWJ6A
Issued At: 2021-12-07T18:28:18.807Z"#,
)
    .unwrap()
    .into();
    
let sig = <Vec<u8>>::from_hex(r#"6228b3ecd7bf2df018183aeab6b6f1db1e9f4e3cbe24560404112e25363540eb679934908143224d746bbb5e1aa65ab435684081f4dbb74a0fec57f98f40f5051c"#).unwrap().try_into().unwrap();

// verify a siwe signature
SignInWithEthereum::verify(&message, &sig)
    .await
    .unwrap();
    
// sign the message to create a cacao
let cacao = message.sign::<SignInWithEthereum>(&message, &sig);

// ipld-encode the cacao
let block = Block::encode(DagCborCodec, Code::Blake3_256, &cacao).unwrap();

`