/**
 * Generates a new ECC key pair for encryption/decryption.
 * Uses P-256 (prime256v1 / NIST P-256) curve.
 *
 * @returns An object containing the private and public keys as hex strings
 */
export declare function generateKeyPair(): {
    privateKey: string;
    publicKey: string;
};
/**
 * Encrypts a value using ECC public key encryption (ECIES).
 *
 * ECIES uses hybrid encryption (ECDH + AES-256-GCM).
 *
 * Wire format:
 *   [Version 0x00 (1B)] [EphemeralPubKey (65B)] [IV (16B)] [AuthTag (16B)] [Ciphertext]
 *
 * @param value - The value to encrypt (any type - will be JSON stringified)
 * @param publicKey - The ECC public key in hex format
 * @returns Promise resolving to base64-encoded encrypted string
 */
export declare function encryptValue(value: any, publicKey: string): Promise<string>;
/**
 * Decrypts a value that was encrypted with encryptValue.
 *
 * @param encryptedValue - The base64-encoded encrypted string
 * @param privateKey - The ECC private key in hex format
 * @returns Promise resolving to the original decrypted value (parsed from JSON)
 */
export declare function decryptValue(encryptedValue: string, privateKey: string): Promise<any>;