/**
 * Encryption utilities for ktaEncrypted storage mode
 */
export interface EncryptionResult {
    ciphertext: string;
    nonce: string;
    publicKey: string;
}
export interface DecryptionParams {
    ciphertext: string;
    nonce: string;
    publicKey: string;
    privateKey: string;
}
/**
 * Audience-key encryption for ktaEncrypted mode
 * Uses X25519 key exchange + ChaCha20-Poly1305 AEAD
 */
export declare class AudienceKeyEncryption {
    /**
     * Generate a new key pair for encryption
     */
    static generateKeyPair(): Promise<CryptoKeyPair>;
    /**
     * Encrypt data for a specific audience public key
     */
    static encrypt(data: string, audiencePublicKey: string): Promise<EncryptionResult>;
    /**
     * Decrypt data using private key
     */
    static decrypt(params: DecryptionParams): Promise<string>;
    /**
     * Import public key from base64 string
     */
    private static importPublicKey;
    /**
     * Import private key from base64 string
     */
    private static importPrivateKey;
    /**
     * Export public key to base64 string
     */
    private static exportPublicKey;
    /**
     * Export private key to base64 string
     */
    static exportPrivateKey(privateKey: CryptoKey): Promise<string>;
}
/**
 * Simple symmetric encryption for testing
 */
export declare class SimpleEncryption {
    /**
     * Encrypt data with a password (for testing only)
     */
    static encrypt(data: string, password: string): Promise<string>;
    /**
     * Decrypt data with a password (for testing only)
     */
    static decrypt(encryptedData: string, password: string): Promise<string>;
}