import { PortableCrypto } from "./portable-crypto";
/** @internal */
export declare class BrowserCrypto implements PortableCrypto {
    private readonly subtle;
    constructor();
    /**
     * MD5 in browser is not supported, so we use SHA-256 instead and return the first 16 bytes
     */
    digest(data: string): Promise<string>;
    hmac(key: string, data: string): Promise<string>;
}