@oslojs/webauthn/dist/signature.js

Parse and verify Web Authentication data

import { sha256 } from "@oslojs/crypto/sha2";
export function createAssertionSignatureMessage(authenticatorData, clientDataJSON) {
    const hash = sha256(clientDataJSON);
    const message = new Uint8Array(authenticatorData.byteLength + hash.byteLength);
    message.set(authenticatorData);
    message.set(hash, authenticatorData.byteLength);
    return message;
}