import { Buffer } from 'buffer';
/**
 * Hash a buffer with provided key using HMAC-SHA512.
 *
 * @param key
 * @param buffer
 * @return {Buffer}
 */
export declare const hmacSHA512: (key: Buffer, buffer: Buffer) => Buffer;
/**
 * Hash a buffer using SHA256.
 *
 * @param {Buffer} buffer
 * @return {Buffer}
 */
export declare const sha256: (buffer: Buffer) => Buffer;
/**
 * Hash a buffer using RIPEMD160.
 *
 * @param {Buffer} buffer
 * @return {Buffer}
 */
export declare const ripemd160: (buffer: Buffer) => Buffer;
/**
 * Hash a buffer using KECCAK256.
 *
 * @param {Buffer} buffer
 * @return {Buffer}
 */
export declare const keccak256: (buffer: Buffer) => Buffer;
/**
 * Derive a key from a buffer and salt. Defaults to 2048 iterations, 64 byte key length and SHA512 as digest.
 *
 * @param {Buffer} buffer
 * @param {Buffer} salt
 * @param {number} [iterations]
 * @param {number} [length]
 * @param {string} [digest]
 * @return {Buffer}
 */
export declare const pbkdf2: (buffer: Buffer, salt: Buffer, iterations?: number, length?: number, digest?: string) => Buffer;
/**
 * Get the checksummed version of an address.
 *
 * @param {string} address
 * @return {string}
 */
export declare const toChecksumAddress: (address: string) => string;