import type { HashObject } from "@chainsafe/as-sha256";
import type { HashComputationLevel } from "../hashComputation.ts";
export type { HashObject };
export type Hasher = {
    name: string;
    /**
     * Hash input Uint8Array into output Uint8Array
     * output.length = input.length / 2
     */
    hashInto(input: Uint8Array, output: Uint8Array): void;
    /**
     * Hash two 32-byte Uint8Arrays
     */
    digest64(a32Bytes: Uint8Array, b32Bytes: Uint8Array): Uint8Array;
    /**
     * The same to digest64, but output is passed as argument
     */
    digest64Into(a32Bytes: Uint8Array, b32Bytes: Uint8Array, output: Uint8Array): void;
    /**
     * Hash two 32-byte HashObjects
     */
    digest64HashObjects(left: HashObject, right: HashObject, parent: HashObject): void;
    /**
     * Merkleize n SHA256 blocks in a single Uint8Array, each block is 64 bytes
     * padFor is maxChunkCount, use it to compute layers to hash
     * blocksBytes is mutated after the function
     */
    merkleizeBlocksBytes(blocksBytes: Uint8Array, padFor: number, output: Uint8Array, offset: number): void;
    /**
     * Merkleize n SHA256 blocks, each is 64 bytes Uint8Array
     * blockLimit is the number of blocks to hash, should be <= blocks.length
     * padFor is maxChunkCount, use it to compute layers to hash
     * blocks are mutated after the function
     */
    merkleizeBlockArray(blocks: Uint8Array[], blockLimit: number, padFor: number, output: Uint8Array, offset: number): void;
    /**
     * Hash multiple chunks (1 chunk = 32 bytes) at multiple levels
     * With nLevel = 3, hash multiple of 256 bytes, return multiple of 32 bytes.
     * The result is unsafe as it will be overwritten by the next call.
     */
    digestNLevel(data: Uint8Array, nLevel: number): Uint8Array;
    /**
     * Execute a batch of HashComputations
     */
    executeHashComputations(hashComputations: HashComputationLevel[]): void;
};