/**
 * Hashes the data with the optional encoding specified. If no encoding is specified, it is assumed that the data is
 * already a Buffer.
 */
export declare const keccak256: (data: string | Uint8Array, encoding?: "utf8" | "hex" | undefined) => Uint8Array;
/**
 * Get a string as Buffer, with the optional encoding specified. If no encoding is specified, it is assumed that the
 * data is a hexadecimal string. The string can optionally contain the 0x prefix.
 */
export declare const toBuffer: (data: string, encoding?: 'utf8' | 'hex') => Uint8Array;