text: var common = require('../common');
  var assert = require('assert');
  
  if (!common.hasCrypto) {
    console.log('1..0 # Skipped: missing crypto');
    process.exit();
  }
  var crypto = require('crypto');
  
  crypto.DEFAULT_ENCODING = 'buffer';
  
  //
  // Test authenticated encryption modes.
  //
  // !NEVER USE STATIC IVs IN REAL LIFE!
  //
  
  var TEST_CASES = [
    { algo: 'aes-128-gcm', key: '6970787039613669314d623455536234',
      iv: '583673497131313748307652', plain: 'Hello World!',
      ct: '4BE13896F64DFA2C2D0F2C76',
      tag: '272B422F62EB545EAA15B5FF84092447', tampered: false },
    { algo: 'aes-128-gcm', key: '6970787039613669314d623455536234',
      iv: '583673497131313748307652', plain: 'Hello World!',
      ct: '4BE13896F64DFA2C2D0F2C76', aad: '000000FF',
      tag: 'BA2479F66275665A88CB7B15F43EB005', tampered: false },
    { algo: 'aes-128-gcm', key: '6970787039613669314d623455536234',
      iv: '583673497131313748307652', plain: 'Hello World!',
      ct: '4BE13596F64DFA2C2D0FAC76',
      tag: '272B422F62EB545EAA15B5FF84092447', tampered: true },
    { algo: 'aes-256-gcm', key: '337a54767a7233703637564336316a6d56353472495975313534357834546c59',
      iv: '36306950306836764a6f4561', plain: 'Hello node.js world!',
      ct: '58E62CFE7B1D274111A82267EBB93866E72B6C2A',
      tag: '9BB44F663BADABACAE9720881FB1EC7A', tampered: false },
    { algo: 'aes-256-gcm', key: '337a54767a7233703637564336316a6d56353472495975313534357834546c59',
      iv: '36306950306836764a6f4561', plain: 'Hello node.js world!',
      ct: '58E62CFF7B1D274011A82267EBB93866E72B6C2B',
      tag: '9BB44F663BADABACAE9720881FB1EC7A', tampered: true },
    { algo: 'aes-192-gcm', key: '1ed2233fa2223ef5d7df08546049406c7305220bca40d4c9',
      iv: '0e1791e9db3bd21a9122c416', plain: 'Hello node.js world!',
      password: 'very bad password', aad: '63616c76696e',
      ct: 'DDA53A4059AA17B88756984995F7BBA3C636CC44',
      tag: 'D2A35E5C611E5E3D2258360241C5B045', tampered: false }
  ];
  
  var ciphers = crypto.getCiphers();
  
  for (var i in TEST_CASES) {
    var test = TEST_CASES[i];
  
    if (ciphers.indexOf(test.algo) == -1) {
      console.log('skipping unsupported ' + test.algo + ' test');
      continue;
    }
  
    (function() {
      var encrypt = crypto.createCipheriv(test.algo,
        new Buffer(test.key, 'hex'), new Buffer(test.iv, 'hex'));
      if (test.aad)
        encrypt.setAAD(new Buffer(test.aad, 'hex'));
      var hex = encrypt.update(test.plain, 'ascii', 'hex');
      hex += encrypt.final('hex');
      var auth_tag = encrypt.getAuthTag();
      // only test basic encryption run if output is marked as tampered.
      if (!test.tampered) {
        assert.equal(hex.toUpperCase(), test.ct);
        assert.equal(auth_tag.toString('hex').toUpperCase(), test.tag);
      }
    })();
  
    (function() {
      var decrypt = crypto.createDecipheriv(test.algo,
        new Buffer(test.key, 'hex'), new Buffer(test.iv, 'hex'));
      decrypt.setAuthTag(new Buffer(test.tag, 'hex'));
      if (test.aad)
        decrypt.setAAD(new Buffer(test.aad, 'hex'));
      var msg = decrypt.update(test.ct, 'hex', 'ascii');
      if (!test.tampered) {
        msg += decrypt.final('ascii');
        assert.equal(msg, test.plain);
      } else {
        // assert that final throws if input data could not be verified!
        assert.throws(function() { decrypt.final('ascii'); }, / auth/);
      }
    })();
  
    (function() {
      if (!test.password) return;
      var encrypt = crypto.createCipher(test.algo, test.password);
      if (test.aad)
        encrypt.setAAD(new Buffer(test.aad, 'hex'));
      var hex = encrypt.update(test.plain, 'ascii', 'hex');
      hex += encrypt.final('hex');
      var auth_tag = encrypt.getAuthTag();
      // only test basic encryption run if output is marked as tampered.
      if (!test.tampered) {
        assert.equal(hex.toUpperCase(), test.ct);
        assert.equal(auth_tag.toString('hex').toUpperCase(), test.tag);
      }
    })();
  
    (function() {
      if (!test.password) return;
      var decrypt = crypto.createDecipher(test.algo, test.password);
      decrypt.setAuthTag(new Buffer(test.tag, 'hex'));
      if (test.aad)
        decrypt.setAAD(new Buffer(test.aad, 'hex'));
      var msg = decrypt.update(test.ct, 'hex', 'ascii');
      if (!test.tampered) {
        msg += decrypt.final('ascii');
        assert.equal(msg, test.plain);
      } else {
        // assert that final throws if input data could not be verified!
        assert.throws(function() { decrypt.final('ascii'); }, / auth/);
      }
    })();
  
    // after normal operation, test some incorrect ways of calling the API:
    // it's most certainly enough to run these tests with one algorithm only.
  
    if (i > 0) {
      continue;
    }
  
    (function() {
      // non-authenticating mode:
      var encrypt = crypto.createCipheriv('aes-128-cbc',
        'ipxp9a6i1Mb4USb4', '6fKjEjR3Vl30EUYC');
      encrypt.update('blah', 'ascii');
      encrypt.final();
      assert.throws(function() { encrypt.getAuthTag(); }, / state/);
      assert.throws(function() {
        encrypt.setAAD(new Buffer('123', 'ascii')); }, / state/);
    })();
  
    (function() {
      // trying to get tag before inputting all data:
      var encrypt = crypto.createCipheriv(test.algo,
        new Buffer(test.key, 'hex'), new Buffer(test.iv, 'hex'));
      encrypt.update('blah', 'ascii');
      assert.throws(function() { encrypt.getAuthTag(); }, / state/);
    })();
  
    (function() {
      // trying to set tag on encryption object:
      var encrypt = crypto.createCipheriv(test.algo,
        new Buffer(test.key, 'hex'), new Buffer(test.iv, 'hex'));
      assert.throws(function() {
        encrypt.setAuthTag(new Buffer(test.tag, 'hex')); }, / state/);
    })();
  
    (function() {
      // trying to read tag from decryption object:
      var decrypt = crypto.createDecipheriv(test.algo,
        new Buffer(test.key, 'hex'), new Buffer(test.iv, 'hex'));
      assert.throws(function() { decrypt.getAuthTag(); }, / state/);
    })();
  }
  