/// <reference types="node" />
/**
 *
 * @param message origin message to sha256
 * @param index The partial hash returned is the hash of 0~index chunks, 512 bits per chunk.
 * @returns [partialHash, partialPreimage, padding]
 */
export declare function partialSha256(message: Buffer, index: number): string[];
/**
 *
 * @param partialHash
 * @param partialPreimage
 * @param padding
 * @returns sha256 of the origin message
 */
export declare function sha256ByPartialHash(partialHash: string, partialPreimage: string, padding: string): string;