text: import assert from "assert";
  import { inherits as inherits$0 } from "util";
  import Cipher from "./cipher";
  import DES from "./des";
  'use strict';
  var inherits = { inherits: inherits$0 }.inherits;
  function EDEState(type, key) {
      assert.equal(key.length, 24, 'Invalid key length');
      var k1 = key.slice(0, 8);
      var k2 = key.slice(8, 16);
      var k3 = key.slice(16, 24);
      if (type === 'encrypt') {
          this.ciphers = [
              DES.create({ type: 'encrypt', key: k1 }),
              DES.create({ type: 'decrypt', key: k2 }),
              DES.create({ type: 'encrypt', key: k3 })
          ];
      }
      else {
          this.ciphers = [
              DES.create({ type: 'decrypt', key: k3 }),
              DES.create({ type: 'encrypt', key: k2 }),
              DES.create({ type: 'decrypt', key: k1 })
          ];
      }
  }
  function EDE(options) {
      Cipher.call(this, options);
      var state = new EDEState(this.type, this.options.key);
      this._edeState = state;
  }
  inherits(EDE, Cipher);
  EDE.create = function create(options) {
      return new EDE(options);
  };
  EDE.prototype._update = function _update(inp, inOff, out, outOff) {
      var state = this._edeState;
      state.ciphers[0]._update(inp, inOff, out, outOff);
      state.ciphers[1]._update(out, outOff, out, outOff);
      state.ciphers[2]._update(out, outOff, out, outOff);
  };
  EDE.prototype._pad = DES.prototype._pad;
  EDE.prototype._unpad = DES.prototype._unpad;
  export default EDE;
  