export interface IKeys {
  /**
   * Private key in hex format
   */
  privateKey: string;

  /**
   * Public key in hex format
   */
  publicKey: string;

  /**
   * Returns Ethereum address of the corresponding keypair
   */
  getAddress(): string;

  /**
   * Sign the data with private key
   * @param {string} data
   * @param {string} privateKey
   * @returns {string}
   */
  sign(data: string, privateKey?: string): string;

  /**
   * Verify the signature accordance to data with public key
   * @param {string} data
   * @param {string} signature
   * @param {string} publicKey
   * @returns {boolean}
   */
  verify(data: string, signature: string, publicKey?: string): boolean;

  /**
   * Encryption
   * @param {string} data
   * @param {string} publicKeyTo
   * @returns {string}
   */
  encrypt(data: string, publicKeyTo?: string): Promise<string>;

  /**
   * Decryption
   * @param {string} encrypted
   * @param {string} publicKeyTo
   * @returns {string}
   */
  decrypt(encrypted: string, publicKeyTo?: string): Promise<string>;
}