@ethereumjs/devp2p/dist/esm/rlpx/mac.js

A JavaScript implementation of ÐΞVp2p

import { createCipheriv } from 'crypto';
import { keccak256 } from 'ethereum-cryptography/keccak.js';
import { xor } from "../util.js";
export class MAC {
    constructor(secret) {
        this._hash = keccak256.create();
        this._secret = secret;
    }
    update(data) {
        this._hash.update(data);
    }
    updateHeader(data) {
        const aes = createCipheriv('aes-256-ecb', this._secret, '');
        const encrypted = aes.update(this.digest());
        this._hash.update(xor(encrypted, data));
    }
    updateBody(data) {
        this._hash.update(data);
        const prev = this.digest();
        const aes = createCipheriv('aes-256-ecb', this._secret, '');
        const encrypted = aes.update(prev);
        this._hash.update(xor(encrypted, prev));
    }
    digest() {
        return Uint8Array.from(this._hash.clone().digest().subarray(0, 16));
    }
}
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