import { Bytes, UInt32, UInt64, UInt8 } from 'o1js';
export { SHA2 };
type FlexibleBytes = Bytes | (UInt8 | bigint | number)[] | Uint8Array | string;
type Length = 224 | 256 | 384 | 512;
declare const SHA2: {
    hash: typeof hash;
    padding256: typeof padding256;
    padding512: typeof padding512;
    initialState256: typeof initialState256;
    initialState512: typeof initialState512;
    messageSchedule256: typeof messageSchedule256;
    messageSchedule512: typeof messageSchedule512;
    compression256: typeof compression256;
    compression512: typeof compression512;
};
declare function hash(len: Length, data: FlexibleBytes): import("node_modules/o1js/dist/node/lib/provable/bytes.js").Bytes;
declare function initialState256(len: 224 | 256): UInt32[];
declare function initialState512(len: 384 | 512): UInt64[];
/**
 * Performs the SHA-256 compression function on the given hash values and message schedule.
 *
 * @param H - The initial or intermediate hash values (8-element array of UInt32).
 * @param W - The message schedule (64-element array of UInt32).
 *
 * @returns The updated intermediate hash values after compression.
 */
declare function compression256([...H]: UInt32[], W: UInt32[]): UInt32[];
/**
 * Performs the SHA-512 compression function on the given hash values and message schedule.
 *
 * @param H - The initial or intermediate hash values (8-element array of UInt64).
 * @param W - The message schedule (80-element array of UInt64).
 *
 * @returns The updated intermediate hash values after compression.
 */
declare function compression512([...H]: UInt64[], W: UInt64[]): UInt64[];
/**
 * Prepares the message schedule for the SHA-256 compression function from the given message block.
 *
 * @param M - The 512-bit message block (16-element array of UInt32).
 * @returns The message schedule (64-element array of UInt32).
 */
declare function messageSchedule256(M: UInt32[]): UInt32[];
/**
 * Prepares the message schedule for the SHA-512 compression function from the given message block.
 *
 * @param M - The 1024-bit message block (16-element array of UInt64).
 * @returns The message schedule (80-element array of UInt64).
 */
declare function messageSchedule512(M: UInt64[]): UInt64[];
declare function padding256(data: FlexibleBytes): UInt32[][];
declare function padding512(data: FlexibleBytes): UInt64[][];