import type { EpochLength } from './types.js';
/**
 * Derive a 32-byte Content Key for a given epoch and tier.
 * CK = HKDF-SHA256(ikm=privkey, salt="dominion-ck-v1", info="epoch:{epochId}:tier:{tier}")
 */
export declare function deriveContentKey(privkeyHex: string, epochId: string, tier: string): Uint8Array;
/** Convert a 32-byte Content Key to a hex string. */
export declare function contentKeyToHex(ck: Uint8Array): string;
/**
 * Get the current epoch ID for a given epoch length. Defaults to weekly.
 *
 * Format depends on length:
 *   - daily   → `YYYY-MM-DD` (ISO 8601 date)
 *   - weekly  → `YYYY-Www`   (ISO 8601 week)
 *   - monthly → `YYYY-MM`    (ISO 8601 year-month)
 */
export declare function getCurrentEpochId(length?: EpochLength): string;
/**
 * Get the epoch ID for a specific date and epoch length. Uses UTC to
 * ensure cross-timezone consistency. Defaults to weekly for backwards
 * compatibility with the original single-argument call.
 */
export declare function getEpochIdForDate(date: Date, length?: EpochLength): string;
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