const vows = require('vows'),
      assert = require('assert'),
      srp = require('../lib/srp'),
      params = srp.params['1024'];

/*
 * http://tools.ietf.org/html/rfc5054#appendix-B
 */

const I = new Buffer("alice"),
      P = new Buffer("password123"),
      s = Buffer('beb25379d1a8581eb5a727673a2441ee', 'hex'),
      k_expected = '7556aa045aef2cdd07abaf0f665c3e818913186f',
      x_expected = '94b7555aabe9127cc58ccf4993db6cf84d16c124',
      v_expected = ('7e273de8 696ffc4f 4e337d05 b4b375be b0dde156 9e8fa00a 9886d812'
                   +'9bada1f1 822223ca 1a605b53 0e379ba4 729fdc59 f105b478 7e5186f5'
                   +'c671085a 1447b52a 48cf1970 b4fb6f84 00bbf4ce bfbb1681 52e08ab5'
                   +'ea53d15c 1aff87b2 b9da6e04 e058ad51 cc72bfc9 033b564e 26480d78'
                   +'e955a5e2 9e7ab245 db2be315 e2099afb').split(/\s/).join(''),

      a = Buffer('60975527035cf2ad1989806f0407210bc81edc04e2762a56afd529ddda2d4393', 'hex'),
      b = Buffer('e487cb59d31ac550471e81f00f6928e01dda08e974a004f49e61f5d105284d20', 'hex'),
      A_expected = ('61d5e490 f6f1b795 47b0704c 436f523d d0e560f0 c64115bb 72557ec4'
                   +'4352e890 3211c046 92272d8b 2d1a5358 a2cf1b6e 0bfcf99f 921530ec'
                   +'8e393561 79eae45e 42ba92ae aced8251 71e1e8b9 af6d9c03 e1327f44'
                   +'be087ef0 6530e69f 66615261 eef54073 ca11cf58 58f0edfd fe15efea'
                   +'b349ef5d 76988a36 72fac47b 0769447b').split(/\s/).join(''),
      B_expected = ('bd0c6151 2c692c0c b6d041fa 01bb152d 4916a1e7 7af46ae1 05393011'
                   +'baf38964 dc46a067 0dd125b9 5a981652 236f99d9 b681cbf8 7837ec99'
                   +'6c6da044 53728610 d0c6ddb5 8b318885 d7d82c7f 8deb75ce 7bd4fbaa'
                   +'37089e6f 9c6059f3 88838e7a 00030b33 1eb76840 910440b1 b27aaeae'
                   +'eb4012b7 d7665238 a8e3fb00 4b117b58').split(/\s/).join(''),

      u_expected = 'ce38b9593487da98554ed47d70a7ae5f462ef019',
      S_expected = ('b0dc82ba bcf30674 ae450c02 87745e79 90a3381f 63b387aa f271a10d'
                   +'233861e3 59b48220 f7c4693c 9ae12b0a 6f67809f 0876e2d0 13800d6c'
                   +'41bb59b6 d5979b5c 00a172b4 a2a5903a 0bdcaf8a 709585eb 2afafa8f'
                   +'3499b200 210dcc1f 10eb3394 3cd67fc8 8a2f39a4 be5bec4e c0a3212d'
                   +'c346d7e4 74b29ede 8a469ffe ca686e5a').split(/\s/).join('');

function asHex(num) {
//!  return num.toBuffer().toString('hex');
  return num.toString(16);
}

vows.describe('RFC 5054')

.addBatch({
  "Test vectors": {
    topic: function() {
      return srp.computeVerifier(params, s, I, P);
    },

    "x": function() {
      var client = new srp.Client(params, s, I, P, a);
      assert.equal(asHex(client._private.x_num), x_expected);
    },

    "V": function(v) {
      assert.equal(v.toString('hex'), v_expected);
    },

    "k": function() {
      var client = new srp.Client(params, s, I, P, a);
      assert.equal(asHex(client._private.k_num), k_expected);
    },

    "A": function() {
      var client = new srp.Client(params, s, I, P, a);
      assert.equal(client.computeA().toString('hex'), A_expected);
    },

    "B": function(v) {
      var server = new srp.Server(params, v, b);
      assert.equal(server.computeB().toString('hex'), B_expected);
    },

    "u": function() {
      var client = new srp.Client(params, s, I, P, a);
      client.setB(Buffer(B_expected, 'hex'));
      assert.equal(asHex(client._private.u_num), u_expected);
    },

    "S client": function() {
      var client = new srp.Client(params, s, I, P, a);
      client.setB(Buffer(B_expected, 'hex'));
      assert.equal(client._private.S_buf.toString('hex'), S_expected);
    },

    "S server": function(v) {
      var server = new srp.Server(params, v, b);
      server.setA(Buffer(A_expected, 'hex'));
      assert.equal(server._private.S_buf.toString('hex'), S_expected);
    }
  }
})

.export(module);