test-webcrypto-sign-verify-hmac.js

'use strict';

const common = require('../common');

if (!common.hasCrypto)
  common.skip('missing crypto');

const assert = require('assert');
const { subtle } = require('crypto').webcrypto;

const vectors = require('../fixtures/crypto/hmac')();

async function testVerify({ hash,
                            keyBuffer,
                            signature,
                            plaintext }) {
  const name = 'HMAC';
  const [
    key,
    noVerifyKey,
    rsaKeys,
  ] = await Promise.all([
    subtle.importKey(
      'raw',
      keyBuffer,
      { name, hash },
      false,
      ['verify']),
    subtle.importKey(
      'raw',
      keyBuffer,
      { name, hash },
      false,
      ['sign']),
    subtle.generateKey(
      {
        name: 'RSA-PSS',
        modulusLength: 1024,
        publicExponent: new Uint8Array([1, 0, 1]),
        hash: 'SHA-256',
      },
      false,
      ['sign']),
  ]);

  assert(await subtle.verify({ name, hash }, key, signature, plaintext));

  // Test verification with altered buffers
  const copy = Buffer.from(plaintext);
  const sigcopy = Buffer.from(signature);
  const p = subtle.verify({ name, hash }, key, sigcopy, copy);
  copy[0] = 255 - copy[0];
  sigcopy[0] = 255 - sigcopy[0];
  assert(await p);

  // Test failure when using wrong key
  await assert.rejects(
    subtle.verify({ name, hash }, noVerifyKey, signature, plaintext), {
      message: /Unable to use this key to verify/
    });

  // Test failure when using the wrong algorithms
  await assert.rejects(
    subtle.verify({ name, hash }, rsaKeys.publicKey, signature, plaintext), {
      message: /Unable to use this key to verify/
    });

  // Test failure when signature is altered
  {
    const copy = Buffer.from(signature);
    copy[0] = 255 - copy[0];
    assert(!(await subtle.verify(
      { name, hash },
      key,
      copy,
      plaintext)));
    assert(!(await subtle.verify(
      { name, hash },
      key,
      copy.slice(1),
      plaintext)));
  }

  // Test failure when data is altered
  {
    const copy = Buffer.from(plaintext);
    copy[0] = 255 - copy[0];
    assert(!(await subtle.verify({ name, hash }, key, signature, copy)));
  }

  // Test failure when wrong hash is used
  {
    const otherhash = hash === 'SHA-1' ? 'SHA-256' : 'SHA-1';
    const keyWithOtherHash = await subtle.importKey(
      'raw',
      keyBuffer,
      { name, hash: otherhash },
      false,
      ['verify']);
    assert(!(await subtle.verify({ name }, keyWithOtherHash, signature, plaintext)));
  }
}

async function testSign({ hash,
                          keyBuffer,
                          signature,
                          plaintext }) {
  const name = 'HMAC';
  const [
    key,
    noSignKey,
    rsaKeys,
  ] = await Promise.all([
    subtle.importKey(
      'raw',
      keyBuffer,
      { name, hash },
      false,
      ['verify', 'sign']),
    subtle.importKey(
      'raw',
      keyBuffer,
      { name, hash },
      false,
      [ 'verify' ]),
    subtle.generateKey(
      {
        name: 'RSA-PSS',
        modulusLength: 1024,
        publicExponent: new Uint8Array([1, 0, 1]),
        hash: 'SHA-256',
      },
      false,
      ['sign']),
  ]);

  {
    const sig = await subtle.sign({ name, hash }, key, plaintext);
    assert.strictEqual(
      Buffer.from(sig).toString('hex'),
      signature.toString('hex'));
    assert(await subtle.verify({ name, hash }, key, sig, plaintext));
  }

  {
    const copy = Buffer.from(plaintext);
    const p = subtle.sign({ name, hash }, key, copy);
    copy[0] = 255 - copy[0];
    const sig = await p;
    assert(await subtle.verify({ name, hash }, key, sig, plaintext));
  }

  await assert.rejects(
    subtle.generateKey({ name }, false, ['sign', 'verify']), {
      name: 'TypeError',
      code: 'ERR_MISSING_OPTION',
    });

  // Test failure when no sign usage
  await assert.rejects(
    subtle.sign({ name, hash }, noSignKey, plaintext), {
      message: /Unable to use this key to sign/
    });

  // Test failure when using the wrong algorithms
  await assert.rejects(
    subtle.sign({ name, hash }, rsaKeys.privateKey, plaintext), {
      message: /Unable to use this key to sign/
    });
}

(async function() {
  const variations = [];

  vectors.forEach((vector) => {
    variations.push(testVerify(vector));
    variations.push(testSign(vector));
  });

  await Promise.all(variations);
})().then(common.mustCall());