@bitgo/bls/lib/signature.js

Implementation of bls signature verification for ethereum 2.0

"use strict";

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

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

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

var _context = require("./context");

var _utils = require("./helpers/utils");

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

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

class Signature {
  constructor(value) {
    _defineProperty(this, "value", void 0);

    this.value = value;
    (0, _assert.default)(this.value.isValidOrder());
  }

  static fromCompressedBytes(value) {
    (0, _assert.default)(value.length === 2 * _constants.FP_POINT_LENGTH, "Signature must have ".concat(2 * _constants.FP_POINT_LENGTH, " bytes"));
    const context = (0, _context.getContext)();
    const signature = new context.Signature();

    if (!_utils.EMPTY_SIGNATURE.equals(value)) {
      signature.deserialize(value);
    }

    return new Signature(signature);
  }

  static fromValue(signature) {
    return new Signature(signature);
  }

  static aggregate(signatures) {
    const context = (0, _context.getContext)();
    const signature = new context.Signature();
    signature.aggregate(signatures.map(sig => sig.getValue()));
    return new Signature(signature);
  }

  add(other) {
    const agg = this.value.clone();
    agg.add(other.value);
    return new Signature(agg);
  }

  getValue() {
    return this.value;
  }

  verifyAggregate(publicKeys, message) {
    return this.value.fastAggregateVerify(publicKeys.map(key => key.getValue()), message);
  }

  verifyMultiple(publicKeys, messages, fast = false) {
    const msgs = Buffer.concat(messages);

    if (!fast && !(0, _context.getContext)().areAllMsgDifferent(msgs)) {
      return false;
    }

    return this.value.aggregateVerifyNoCheck(publicKeys.map(key => key.getValue()), msgs);
  }

  toBytesCompressed() {
    return Buffer.from(this.value.serialize());
  }

  toHex() {
    return "0x" + this.value.serializeToHexStr();
  }

}

exports.Signature = Signature;