export declare const PBKDF2: ({ salt, passphrase }: {
    salt: BufferSource;
    passphrase: BufferSource;
}) => Promise<ArrayBuffer>;
export declare function normalize(str: string): Uint8Array<ArrayBuffer>;
export declare function gen_PBKDF2({ hash, byte, iterations }: {
    byte: number;
    hash: `SHA-${256 | 512}`;
    iterations: number;
}): ({ salt, passphrase }: {
    salt: BufferSource;
    passphrase: BufferSource;
}) => Promise<ArrayBuffer>;