import { IEncryptionStrategy, EncryptionResult, DecryptionParams } from '../encryption-strategy.interface';
/**
 * XChaCha20-Poly1305 Encryption Strategy
 *
 * SOLID Principles:
 * - Single Responsibility: Handles XChaCha20-Poly1305 encryption/decryption
 * - Open/Closed: Implements IEncryptionStrategy interface
 * - Liskov Substitution: Can substitute any IEncryptionStrategy
 * - Interface Segregation: Focused interface
 * - Dependency Inversion: Depends on IEncryptionStrategy abstraction
 *
 * Algorithm Details:
 * - XChaCha20-Poly1305 is an extended nonce variant of ChaCha20-Poly1305
 * - XChaCha20: Extended nonce stream cipher (192-bit nonce)
 * - Poly1305: Message authentication code
 * - Advantages over ChaCha20-Poly1305:
 *   * 192-bit nonce (vs 96-bit) allows random nonce generation without collision risk
 *   * Better for scenarios where nonce management is difficult
 *   * Used in modern protocols like WireGuard
 * - 256-bit key, 192-bit nonce (IV)
 */
export declare class XChaCha20Poly1305Strategy implements IEncryptionStrategy {
    readonly algorithmName = "XChaCha20-Poly1305";
    readonly isSupported = true;
    readonly requiresExternalLibrary = true;
    private readonly PBKDF2_ITERATIONS;
    private readonly KEY_LENGTH;
    private readonly IV_SIZE;
    private readonly SALT_SIZE;
    /**
     * Get recommended IV (nonce) size
     */
    getIvSize(): number;
    /**
     * Get recommended salt size
     */
    getSaltSize(): number;
    /**
     * Encrypt data using XChaCha20-Poly1305
     */
    encrypt(data: ArrayBuffer, password: string, saltHex: string, ivHex: string): Promise<EncryptionResult>;
    /**
     * Decrypt data using XChaCha20-Poly1305
     */
    decrypt(params: DecryptionParams): Promise<Blob>;
    /**
     * Derive encryption key from password using PBKDF2
     *
     * PBKDF2 (Password-Based Key Derivation Function 2):
     * - Derives a cryptographic key from a password
     * - Uses salt to prevent rainbow table attacks
     * - Uses iterations to slow down brute-force attacks
     * - NIST approved (FIPS 140-2)
     */
    private deriveKey;
    /**
     * Convert hex string to Uint8Array
     */
    private hexToUint8Array;
}
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