/** Compare exactly-32-byte tags. XOR-accumulate over all 32 bytes, no early exit. */
export declare function ctEqualTags(a: Uint8Array, b: Uint8Array): boolean;
/**
 * Blinded equality of arbitrary-length byte strings: fresh K_e per
 * comparison (never stored, never reused), HMAC both sides to 32-byte
 * tags, then ctEqualTags. On the digest path the inputs are already
 * 32-byte PBKDF2 outputs but still route through this reduction so
 * there is exactly ONE comparison construction (spec §3 rule 2).
 */
export declare function blindedEqual(a: Uint8Array, b: Uint8Array): Promise<boolean>;