/**
 * Utility functions for ECIES operations
 *
 * Provides conversion utilities between different data formats
 * to bridge platform-specific implementations.
 */
/**
 * Checks if two Uint8Arrays are equal in constant time
 *
 * @param a - First array to compare
 * @param b - Second array to compare
 * @returns `true` if arrays are equal
 */
export declare function constantTimeEqual(a: Uint8Array, b: Uint8Array): boolean;
/**
 * Converts Buffer to Uint8Array (for Node.js compatibility layer)
 * In browser, this is a no-op if already Uint8Array
 *
 * @param buffer - Buffer or Uint8Array to convert
 * @returns Uint8Array representation
 */
export declare function bufferToBytes(buffer: Buffer | Uint8Array): Uint8Array;
/**
 * Converts Uint8Array to Buffer (for Node.js compatibility layer)
 * Only available in Node.js environment
 *
 * @param bytes - Uint8Array to convert to Buffer
 * @returns Buffer representation
 */
export declare function bytesToBuffer(bytes: Uint8Array): Buffer;