/**
 * Encrypt PIN using AES encryption
 */
export declare const encryptPin: (pin: string) => string;
/**
 * Decrypt PIN (for verification purposes)
 */
export declare const decryptPin: (encryptedPin: string) => string;
/**
 * Get encrypted PIN for API transmission.
 *
 * Mobile inference no longer accepts the legacy client-side AES PIN format
 * (`U2FsdGVk...`). The SDK stores the raw PIN through `/store-pin/mobile`;
 * data handoff and training must rely on the backend-stored PIN only.
 */
export declare const getEncryptedPinForAPI: () => Promise<string | null>;
/**
 * Hash PIN for verification (one-way hash)
 */
export declare const hashPin: (pin: string) => string;
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