import {Signature, PrivateKey} from 'gxbjs/dist/index';

/**
 * @module Signature
 */

/**
 * @static signBuffer
 * @function
 * @param buffer {Object} - a buffer
 * @param private_key {String} - private key
 * @returns {Signature} you can use .toHex to get signature hex string
 *
 * @example
 * import { Signature } from 'gxclient'
 * const buf = Buffer.from('hello')
 * Signature.signBuffer(buf, '5KQNge45iAFohAJFnXowuPk3ob3eiGbAQMCtff7tM78i5RNywMe')
 *
 * @example
 * // if you want to use verify_signature function in contract, you must serialize your buffer first
 * import {serialize, Types} from 'gxclient'
 * const buf = serialize('hello', Types.string)
 * Signature.signBuffer(buf, '5KQNge45iAFohAJFnXowuPk3ob3eiGbAQMCtff7tM78i5RNywMe')
 */
const signBuffer = (buf, pvk) => {
  return Signature.signBuffer(buf, PrivateKey.fromWif(pvk));
};

export {signBuffer};