/**
 * Compute the indexed lookup digest for a raw token.
 * `HMAC-SHA256(lookup_key, raw_token)` as lowercase hex. Deterministic for a
 * fixed key, so it can be stored + queried. NEVER an auth decision on its own.
 */
export declare function computeTokenLookup(rawToken: string): string;
/** Test-only: drop the memoized key so a test can swap keyring/instance dir between cases. */
export declare function _resetTokenLookupCacheForTests(): void;
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