/**
 * Encrypts a secret using AES-256-GCM
 *
 * @param secret - The secret to encrypt
 * @param encryptionKey - The encryption key (will be hashed to 256 bits)
 * @returns Base64 encoded encrypted data containing IV, encrypted token, and auth tag
 * @throws Error if encryption fails or inputs are invalid
 */
export declare function encryptSecret(secret: string, encryptionKey: string): string;
/**
 * Decrypts a secret using AES-256-GCM
 *
 * @param encryptedSecret - Base64 encoded encrypted data from encryptSecret
 * @param encryptionKey - The encryption key used for encryption
 * @returns The decrypted secret
 * @throws Error if decryption fails or inputs are invalid
 */
export declare function decryptSecret(encryptedSecret: string, encryptionKey: string): string;
/**
 * Computes a deterministic SHA-256 hash of a JSON object.
 *
 * @param json - The JSON object to hash.
 * @returns The SHA-256 hash of the normalized JSON object as a hexadecimal string.
 */
export declare function computeObjectHash(json: Record<string, any>): string;