/**
 * Encryption Utilities
 *
 * Provides encryption/decryption for sensitive provider credentials
 * Uses Web Crypto API with AES-GCM encryption
 */
/**
 * Encrypts provider credentials
 *
 * @param data - The data to encrypt (provider credentials)
 * @param userSessionToken - User's session token for key derivation
 * @returns Encrypted data with salt and IV prepended (base64 encoded)
 */
export declare function encryptProvider(data: string, userSessionToken: string): Promise<string>;
/**
 * Decrypts provider credentials
 *
 * @param encryptedData - Base64 encoded encrypted data with salt and IV
 * @param userSessionToken - User's session token for key derivation
 * @returns Decrypted data (original provider credentials)
 */
export declare function decryptProvider(encryptedData: string, userSessionToken: string): Promise<string>;
/**
 * Checks if Web Crypto API is available
 */
export declare function isEncryptionAvailable(): boolean;
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