/**
 * Web Crypto API Utilities
 * Core encryption/decryption functions using Web Crypto API
 */
import type { EncryptionAlgorithm, EncryptionKey, EncryptedFieldMetadata, KeyFormat } from '@plyaz/types/api';
/**
 * Check if Web Crypto API is available
 */
export declare function isCryptoAvailable(): boolean;
/**
 * Generate a random IV (Initialization Vector)
 */
export declare function generateIV(algorithm: EncryptionAlgorithm): Uint8Array;
/**
 * Convert base64 string to Uint8Array
 */
export declare function base64ToBytes(base64: string): Uint8Array;
/**
 * Convert Uint8Array to base64 string
 */
export declare function bytesToBase64(bytes: Uint8Array): string;
/**
 * Import encryption key from various formats
 */
export declare function importKey(key: CryptoKey | string | JsonWebKey, algorithm: EncryptionAlgorithm, format?: KeyFormat): Promise<CryptoKey>;
/**
 * Encrypt data using the specified algorithm
 *
 * @param data - Data to encrypt (will be JSON stringified if not a string)
 * @param encryptionKey - Encryption key configuration
 * @returns Encrypted data with metadata
 */
export declare function encrypt(data: string | number | boolean | object | null, encryptionKey: EncryptionKey): Promise<EncryptedFieldMetadata>;
/**
 * Decrypt encrypted field metadata
 *
 * @param encrypted - Encrypted field metadata or base64 string
 * @param encryptionKey - Encryption key configuration
 * @returns Decrypted data
 */
export declare function decrypt(encrypted: EncryptedFieldMetadata | string, encryptionKey: EncryptionKey): Promise<string | number | boolean | object | null>;
/**
 * Check if a value is encrypted field metadata
 */
export declare function isEncryptedMetadata(value: unknown): value is EncryptedFieldMetadata;
/**
 * Generate a random encryption key (for development/testing)
 * DO NOT use in production - use proper key management
 */
export declare function generateRandomKey(): Uint8Array;
/**
 * Export a CryptoKey to base64 (for storage)
 * WARNING: Only use in secure contexts with proper key management
 */
export declare function exportKeyToBase64(key: CryptoKey): Promise<string>;
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