@bsv/sdk/dist/esm/src/auth/utils/verifyNonce.js

BSV Blockchain Software Development Kit

import * as Utils from '../../primitives/utils.js';
/**
 * Verifies a nonce derived from a wallet
 * @param nonce - A nonce to verify as a base64 string.
 * @param wallet
 * @param counterparty - The counterparty to the nonce creation. Defaults to 'self'.
 * @returns The status of the validation
 */
export async function verifyNonce(nonce, wallet, counterparty = 'self', originator) {
    // Convert nonce from base64 string to Uint8Array
    const buffer = Utils.toArray(nonce, 'base64');
    // Split the nonce buffer
    const data = buffer.slice(0, 16);
    const hmac = buffer.slice(16);
    // Calculate the HMAC
    const { valid } = await wallet.verifyHmac({
        data,
        hmac,
        protocolID: [2, 'server hmac'],
        keyID: Utils.toUTF8(data),
        counterparty
    }, originator);
    return valid;
}
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