rootchain-wasm

WebAssembly Cryptographic Primitives for the RootChain Ecosystem

rootchain-wasm provides the core cryptographic and transaction-processing logic for RootChain, compiled to highly-optimized WebAssembly. It is designed to be used in performance-critical environments like the rootchain-sdk to handle secure key derivation and offline transaction signing.

⚡ Core Functions

1. Account Derivation

Derive Ed25519 accounts deterministically from BIP-39 mnemonics.

import { derive_account } from 'rootchain-wasm';

const mnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
const account = derive_account(mnemonic, 0);

console.log(`Address: ${account.address}`);
console.log(`Secret Key: ${account.private_key}`);

2. Transaction Signing

Serialize and sign RootChain transactions safely within the WASM sandbox.

import { sign_transaction } from 'rootchain-wasm';

const tx = {
    tx_type: "Transfer",
    from: Array(32).fill(0), // Automatically filled by signer
    to: Array(32).fill(1),
    amount: "1000",
    fee: "10",
    nonce: 1,
    payload: [],
    signature: Array(64).fill(0)
};

const signedTxJson = sign_transaction(JSON.stringify(tx), privateKeyHex);

3. Utility Primitives

• generate_mnemonic(): Generate new 12-word English recovery phrases.
• get_address_from_key(privKey): Resolve a public address from a raw secret key.
• get_contract_address(from, nonce): Deterministically calculate the address for the next deployed smart contract.

🛠️ Build Requirements

To rebuild the package from source, you will need wasm-pack:

cargo install wasm-pack
wasm-pack build --target bundler

📄 License

This project is licensed under the MIT License.