use-test.js

var assert = require('assert');
var asn1 = require('..');
var bn = asn1.bignum;
var fixtures = require('./fixtures');
var jsonEqual = fixtures.jsonEqual;

var Buffer = require('buffer').Buffer;

describe('asn1.js models', function() {
  describe('plain use', function() {
    it('should encode submodel', function() {
      var SubModel = asn1.define('SubModel', function() {
        this.seq().obj(
          this.key('b').octstr()
        );
      });
      var Model = asn1.define('Model', function() {
        this.seq().obj(
          this.key('a').int(),
          this.key('sub').use(SubModel)
        );
      });

      var data = {a: new bn(1), sub: {b: new Buffer("XXX")}};
      var wire = Model.encode(data, 'der');
      assert.equal(wire.toString('hex'), '300a02010130050403585858');
      var back = Model.decode(wire, 'der');
      jsonEqual(back, data);
    });

    it('should honour implicit tag from parent', function() {
      var SubModel = asn1.define('SubModel', function() {
        this.seq().obj(
          this.key('x').octstr()
        )
      });
      var Model = asn1.define('Model', function() {
        this.seq().obj(
          this.key('a').int(),
          this.key('sub').use(SubModel).implicit(0)
        );
      });

      var data = {a: new bn(1), sub: {x: new Buffer("123")}};
      var wire = Model.encode(data, 'der');
      assert.equal(wire.toString('hex'), '300a020101a0050403313233');
      var back = Model.decode(wire, 'der');
      jsonEqual(back, data);
    });

    it('should honour explicit tag from parent', function() {
      var SubModel = asn1.define('SubModel', function() {
        this.seq().obj(
          this.key('x').octstr()
        )
      });
      var Model = asn1.define('Model', function() {
        this.seq().obj(
          this.key('a').int(),
          this.key('sub').use(SubModel).explicit(0)
        );
      });

      var data = {a: new bn(1), sub: {x: new Buffer("123")}};
      var wire = Model.encode(data, 'der');
      assert.equal(wire.toString('hex'), '300c020101a00730050403313233');
      var back = Model.decode(wire, 'der');
      jsonEqual(back, data);

    });

    it('should get model with function call', function() {
      var SubModel = asn1.define('SubModel', function() {
        this.seq().obj(
          this.key('x').octstr()
        )
      });
      var Model = asn1.define('Model', function() {
        this.seq().obj(
          this.key('a').int(),
          this.key('sub').use(function(obj) {
              assert.equal(obj.a, 1);
              return SubModel;
          })
        );
      });

      var data = {a: new bn(1), sub: {x: new Buffer("123")}};
      var wire = Model.encode(data, 'der');
      assert.equal(wire.toString('hex'), '300a02010130050403313233');
      var back = Model.decode(wire, 'der');
      jsonEqual(back, data);

    });

    it('should support recursive submodels', function() {
      var PlainSubModel = asn1.define('PlainSubModel', function() {
        this.int();
      });
      var RecursiveModel = asn1.define('RecursiveModel', function() {
        this.seq().obj(
          this.key('plain').bool(),
          this.key('content').use(function(obj) {
            if(obj.plain) {
              return PlainSubModel;
            } else {
              return RecursiveModel;
            }
          })
        );
      });

      var data = {
        'plain': false,
        'content': {
          'plain': true,
          'content': new bn(1)
        }
      };
      var wire = RecursiveModel.encode(data, 'der');
      assert.equal(wire.toString('hex'), '300b01010030060101ff020101');
      var back = RecursiveModel.decode(wire, 'der');
      jsonEqual(back, data);
    });

  });
});