import { BinaryLike } from '@findeth/abi';
/**
 * Hash a buffer with provided key using HMAC-SHA512.
 *
 * @param {Uint8Array} key
 * @param {Uint8Array} buffer
 * @return {Uint8Array}
 */
export declare const hmacSHA512: (key: Uint8Array, buffer: Uint8Array) => Uint8Array;
/**
 * Hash a buffer using SHA256.
 *
 * @param {Uint8Array} buffer
 * @return {Uint8Array}
 */
export declare const sha256: (buffer: Uint8Array) => Uint8Array;
/**
 * Hash a buffer using RIPEMD160.
 *
 * @param {Uint8Array} buffer
 * @return {Uint8Array}
 */
export declare const ripemd160: (buffer: Uint8Array) => Uint8Array;
/**
 * Returns the Keccak-256 hash of a string, as a hexadecimal string.
 *
 * @param {string} input
 * @return {string}
 */
export declare const keccak256: (input: BinaryLike) => Uint8Array;
/**
 * Derive a key from a buffer and salt. Defaults to 2048 iterations, 64 byte key length and SHA512 as digest.
 *
 * @param {Uint8Array} buffer
 * @param {Uint8Array} salt
 * @param {number} [iterations]
 * @param {number} [length]
 * @param {string} [digest]
 * @return {Uint8Array}
 */
export declare const pbkdf2: (buffer: Uint8Array, salt: Uint8Array, iterations?: number, length?: number, digest?: string) => Uint8Array;