@bitgo/bls/lib/helpers/utils.js

Implementation of bls signature verification for ethereum 2.0

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.padLeft = padLeft;
exports.EMPTY_SIGNATURE = exports.EMPTY_PUBLIC_KEY = void 0;

var _assert = _interopRequireDefault(require("assert"));

var _constants = require("../constants");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Pads byte array with zeroes on left side up to desired length.
 * Throws if source is larger than desired result.
 * @param source
 * @param length
 */
function padLeft(source, length) {
  (0, _assert.default)(source.length <= length, "Given array must be smaller or equal to desired array size");
  const result = Buffer.alloc(length, 0);
  result.set(source, length - source.length);
  return result;
}

const EMPTY_PUBLIC_KEY = Buffer.alloc(_constants.PUBLIC_KEY_LENGTH);
exports.EMPTY_PUBLIC_KEY = EMPTY_PUBLIC_KEY;
const EMPTY_SIGNATURE = Buffer.alloc(_constants.SIGNATURE_LENGTH);
exports.EMPTY_SIGNATURE = EMPTY_SIGNATURE;