export declare const DOMAIN_KEY_LENGTH = 32;
/**
 * Represents a domain key.
 *
 * Domains must conform to regex: /^[a-z0-9_]+$/.
 */
export declare class DomainKey {
    readonly value: Uint8Array;
    static fromHex(hexString: string): DomainKey;
    static random(): DomainKey;
    constructor(value: Uint8Array);
    toHex(): string;
    toString(): string;
}
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