/** Family KDF constant — matches crypto.ts PBKDF2_ITERATIONS (600K). */
export declare const VDIG_ITERATIONS = 600000;
/**
 * Digest a (pre-normalized) candidate/value to exactly 32 bytes.
 * PBKDF2-SHA256 with a per-record per-write random salt (§2): verify
 * digests are non-equatable by construction.
 */
export declare function pbkdf2VerifyDigest(value: string, salt: Uint8Array, iterations: number): Promise<Uint8Array>;