cwt-js

CWT implementation.

install

npm install cwt-js --save

Usage

MAC CWT

const CWT = require('cwt-js');

const encKey = {
  'k': Buffer.from('403697de87af64611c1d32a05dab0fe1fcb715a86ab435f1ec99192d79569388', 'hex'),
  'kid': 'Symmetric256'
};
const alg = 'HS256/64';
const claims = {
  'iss': 'coap://as.example.com',
  'sub': 'erikw',
  'aud': 'coap://light.example.com',
  'exp': 1444064944,
  'nbf': 1443944944,
  'iat': 1443944944,
  'cti': '0b71'
};

const cwt = new CWT(claims);
cwt.mac(encKey, alg).then(cwt => {
  console.log(cwt.raw.toString('hex'));
});

Verify MACed CWT

const CWT = require('cwt-js');

const decKey = {
  'k': Buffer.from('403697de87af64611c1d32a05dab0fe1fcb715a86ab435f1ec99192d79569388', 'hex'),
  'kid': 'Symmetric256'
};
const token = Buffer.from('d83dd18443a10104a1044c53796d6d65747269633235365850a70175636f61703a2f2f61732e6578616d706c652e636f6d02656572696b77037818636f61703a2f2f6c696768742e6578616d706c652e636f6d041a5612aeb0051a5610d9f0061a5610d9f007420b7148093101ef6d789200', 'hex');

CWT.parse(token, decKey).then(cwt => {
  console.log(cwt.claims);
});

Sign CWT

const CWT = require('cwt-js');

const signKey = {
  'd': Buffer.from('6c1382765aec5358f117733d281c1c7bdc39884d04a45a1e6c67c858bc206c19', 'hex'),
  'kid': 'AsymmetricECDSA256'
};
const alg = 'ES256';
const claims = {
  'iss': 'coap://as.example.com',
  'sub': 'erikw',
  'aud': 'coap://light.example.com',
  'exp': 1444064944,
  'nbf': 1443944944,
  'iat': 1443944944,
  'cti': '0b71'
};

const cwt = new CWT(claims);
cwt.sign(signKey, alg).then(cwt => {
  console.log(cwt.raw.toString('hex'));
});

Verify Signed CWT

const CWT = require('cwt-js');

const verifyKey = {
  'x': Buffer.from('143329cce7868e416927599cf65a34f3ce2ffda55a7eca69ed8919a394d42f0f', 'hex'),
  'y': Buffer.from('60f7f1a780d8a783bfb7a2dd6b2796e8128dbbcef9d3d168db9529971a36e7b9', 'hex'),
  'kid': 'AsymmetricECDSA256'
};

const token = Buffer.from('d28443a10126a104524173796d6d657472696345434453413235365850a70175636f61703a2f2f61732e6578616d706c652e636f6d02656572696b77037818636f61703a2f2f6c696768742e6578616d706c652e636f6d041a5612aeb0051a5610d9f0061a5610d9f007420b7158405427c1ff28d23fbad1f29c4c7c6a555e601d6fa29f9179bc3d7438bacaca5acd08c8d4d4f96131680c429a01f85951ecee743a52b9b63632c57209120e1c9e30', 'hex');

CWT.parse(token, verifyKey).then(cwt => {
  console.log(cwt.claims);
});

Encrypt CWT

const CWT = require('cwt-js');

const encKey = {
  'k': Buffer.from('231f4c4d4d3051fdc2ec0a3851d5b383', 'hex'),
  'kid': 'Symmetric128'
};

const alg = 'AES-CCM-16-64-128';
const claims = {
  'iss': 'coap://as.example.com',
  'sub': 'erikw',
  'aud': 'coap://light.example.com',
  'exp': 1444064944,
  'nbf': 1443944944,
  'iat': 1443944944,
  'cti': '0b71'
};

const cwt = new CWT(claims);
cwt.encrypt(encKey, alg).then(cwt => {
  console.log(cwt.raw.toString('hex'));
});

Decrypt CWT

const CWT = require('cwt-js');

const decKey = {
  'k': Buffer.from('231f4c4d4d3051fdc2ec0a3851d5b383', 'hex'),
  'kid': 'Symmetric128'
};
const token = Buffer.from('d08343a1010aa2044c53796d6d6574726963313238054d99a0d7846e762c49ffe8a63e0b5858b918a11fd81e438b7f973d9e2e119bcb22424ba0f38a80f27562f400ee1d0d6c0fdb559c02421fd384fc2ebe22d7071378b0ea7428fff157444d45f7e6afcda1aae5f6495830c58627087fc5b4974f319a8707a635dd643b', 'hex');

CWT.parse(token, decKey).then(cwt => {
  console.log(cwt.claims);
});

Create Nested CWT

const CWT = require('cwt-js');

const claims = {
  'iss': 'coap://as.example.com',
  'sub': 'erikw',
  'aud': 'coap://light.example.com',
  'exp': 1444064944,
  'nbf': 1443944944,
  'iat': 1443944944,
  'cti': '0b71'
};

const encAlg = 'AES-CCM-16-64-128';
const encKey = {
  'k': Buffer.from('231f4c4d4d3051fdc2ec0a3851d5b383', 'hex'),
  'kid': 'Symmetric128'
};

const signAlg = 'ES256';
const signKey = {
  'd': Buffer.from('6c1382765aec5358f117733d281c1c7bdc39884d04a45a1e6c67c858bc206c19', 'hex'),
  'kid': 'AsymmetricECDSA256'
};

const cwt = new CWT(claims);
cwt.sign(signKey, signAlg).then(signedCWT => {
  return signedCWT.encrypt(encKey, encAlg);
}).then(encryptedCWT => {
  console.log(encryptedCWT.raw.toString('hex'));
});

Verify Nested CWT

const CWT = require('cwt-js');

const decKey = {
  'k': Buffer.from('231f4c4d4d3051fdc2ec0a3851d5b383', 'hex'),
  'kid': 'Symmetric128'
};

const verifyKey = {
  'x': Buffer.from('143329cce7868e416927599cf65a34f3ce2ffda55a7eca69ed8919a394d42f0f', 'hex'),
  'y': Buffer.from('60f7f1a780d8a783bfb7a2dd6b2796e8128dbbcef9d3d168db9529971a36e7b9', 'hex'),
  'kid': 'AsymmetricECDSA256'
};

const token = Buffer.from('d08343a1010aa2044c53796d6d6574726963313238054dc62ed9a1391053623cdb5c5c7458b7cb6c7a62c5ad2792bd1b17c18e2eb28764c81e3f359ed7fc98a6177b179475548148b37b58319d403ae5929af804a356682f881ce4e409f0c3f8003620c03afaaa3a1ccf1fc0298cd98cd21d1db0b92739862805bee7227ce98046816831ecb23b1553d097d32eeb00b3513a3dde28da557996a732fe596746e0b6b0b8725c201bc7b7321c77a91792de9c4ecda33499810962fad24ab2ff37a4fb7a85d15b3f5e1da2a7ae38067eba20439947a57e17590413df08c333', 'hex');
CWT.parse(token, decKey).then(cwt => {
  console.log('done: ' + cwt.done);
  return cwt.continue(verifyKey);
}).then((cwt) => {
  console.log('done: ' + cwt.done);
  console.log(cwt.claims);
});