'use strict';

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

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

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

const rsa_pkcs = require('../fixtures/crypto/rsa_pkcs');
const rsa_pss = require('../fixtures/crypto/rsa_pss');

async function testVerify({
  algorithm,
  hash,
  publicKeyBuffer,
  privateKeyBuffer,
  signature,
  plaintext,
}) {
  const [
    publicKey,
    noVerifyPublicKey,
    privateKey,
    hmacKey,
    ecdsaKeys,
  ] = await Promise.all([
    subtle.importKey(
      'spki',
      publicKeyBuffer,
      { name: algorithm.name, hash },
      false,
      ['verify']),
    subtle.importKey(
      'spki',
      publicKeyBuffer,
      { name: algorithm.name, hash },
      false,
      [ /* No usages */ ]),
    subtle.importKey(
      'pkcs8',
      privateKeyBuffer,
      { name: algorithm.name, hash },
      false,
      ['sign']),
    subtle.generateKey(
      { name: 'HMAC', hash: 'SHA-256' },
      false,
      ['sign']),
    subtle.generateKey(
      {
        name: 'ECDSA',
        namedCurve: 'P-521',
        hash: 'SHA-256',
      },
      false,
      ['sign']),
  ]);

  assert(await subtle.verify(algorithm, publicKey, signature, plaintext));

  // Test verification with altered buffers
  const copy = Buffer.from(plaintext);
  const sigcopy = Buffer.from(signature);
  const p = subtle.verify(algorithm, publicKey, 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(algorithm, privateKey, signature, plaintext), {
      message: /Unable to use this key to verify/
    });

  await assert.rejects(
    subtle.verify(algorithm, noVerifyPublicKey, signature, plaintext), {
      message: /Unable to use this key to verify/
    });

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

  await assert.rejects(
    subtle.verify(algorithm, ecdsaKeys.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(algorithm, publicKey, copy, plaintext)));
    assert(!(await subtle.verify(
      algorithm,
      publicKey,
      copy.slice(1),
      plaintext)));
  }

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

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

async function testSign({
  algorithm,
  hash,
  publicKeyBuffer,
  privateKeyBuffer,
  signature,
  plaintext,
}) {
  const [
    publicKey,
    privateKey,
    hmacKey,
    ecdsaKeys,
  ] = await Promise.all([
    subtle.importKey(
      'spki',
      publicKeyBuffer,
      { name: algorithm.name, hash },
      false,
      ['verify']),
    subtle.importKey(
      'pkcs8',
      privateKeyBuffer,
      { name: algorithm.name, hash },
      false,
      ['sign']),
    subtle.generateKey(
      { name: 'HMAC', hash: 'SHA-256' },
      false,
      ['sign']),
    subtle.generateKey(
      {
        name: 'ECDSA',
        namedCurve: 'P-521',
        hash: 'SHA-256',
      },
      false,
      ['sign']),
  ]);

  {
    const sig = await subtle.sign(algorithm, privateKey, plaintext);
    assert.strictEqual(sig.byteLength, signature.byteLength);
    assert(await subtle.verify(algorithm, publicKey, sig, plaintext));
  }

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

  // Test failure when using wrong key
  await assert.rejects(
    subtle.sign(algorithm, publicKey, plaintext), {
      message: /Unable to use this key to sign/
    });

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

  await assert.rejects(
    subtle.sign(algorithm, ecdsaKeys.privateKey, plaintext), {
      message: /Unable to use this key to sign/
    });
}

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

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

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