import { HashStrategy } from '../HashStrategy';
/**
 * TaggedSha256Strategy - Implementation of HashStrategy using BIP-0340 tagged SHA-256
 * This implements tagged hashing as defined in BIP-0340: SHA256(SHA256(tag) || SHA256(tag) || msg)
 */
export declare class TaggedSha256Strategy implements HashStrategy {
    private readonly tag;
    private readonly tagHash;
    /**
     * Initialize with a specific tag
     *
     * @param tag - Tag string to use for domain separation
     */
    constructor(tag: string);
    /**
     * Calculate a tagged SHA-256 hash for the input data
     *
     * @param data - The data to hash
     * @returns The computed tagged SHA-256 hash as a Buffer
     */
    hash(data: Buffer | string): Buffer;
    /**
     * Get the algorithm name including the tag
     *
     * @returns A descriptive string with the algorithm and tag
     */
    getAlgorithmName(): string;
    /**
     * Get the tag used for this strategy
     *
     * @returns The tag string
     */
    getTag(): string;
    /**
     * Get the pre-computed tag hash
     *
     * @returns The tag hash as a Buffer
     */
    getTagHash(): Buffer;
}