feat(NODE-7379): Refactor Crypto to Web Crypto API

.eslintrc.json

@@ -279,7 +279,8 @@
               "**/../lib/**",
               "mongodb-mock-server",
               "node:*",
-              "os"
+              "os",
+              "crypto"
             ],
             "paths": [
               {
@@ -346,4 +347,4 @@
       }
     }
   ]
-}
+}

README.md

@@ -101,6 +101,17 @@ If you run into any unexpected compiler failures against our supported TypeScrip
 
 Additionally, our Typescript types are compatible with the ECMAScript standard for our minimum supported Node version. Currently, our Typescript targets es2023.
 
+#### Running in Custom Runtimes
+
+We are working on removing Node.js as a dependency of the driver, so that in the future it will be possible to use the driver in non-Node environments.
+This work is currently in progress, and if you're curious, this is [our first runtime adapter commit](https://github.com/mongodb/node-mongodb-native/commit/d2ad07f20903d86334da81222a6df9717f76faaa).
+
+Some things to keep in mind if you are using a non-Node runtime:
+
+1. Users of Webpack/Vite may need to prevent `crypto` polyfill injection.
+2. Auth mechanism `SCRAM-SHA-1` has a hard dependency on Node.js.
+3. Auth mechanism `SCRAM-SHA-1` is not supported in FIPS mode.
+
 ## Installation
 
 The recommended way to get started using the Node.js driver is by using the `npm` (Node Package Manager) to install the dependency in your project.

src/cmap/auth/scram.ts

@@ -1,5 +1,4 @@
 import { saslprep } from '@mongodb-js/saslprep';
-import * as crypto from 'crypto';
 
 import { Binary, ByteUtils, type Document } from '../../bson';
 import {
@@ -157,27 +156,27 @@ async function continueScramConversation(
 
   // Set up start of proof
   const withoutProof = `c=biws,r=${rnonce}`;
-  const saltedPassword = HI(
+  const saltedPassword = await HI(
     processedPassword,
     ByteUtils.fromBase64(salt),
     iterations,
     cryptoMethod
   );
 
-  const clientKey = HMAC(cryptoMethod, saltedPassword, 'Client Key');
-  const serverKey = HMAC(cryptoMethod, saltedPassword, 'Server Key');
-  const storedKey = H(cryptoMethod, clientKey);
+  const clientKey = await HMAC(cryptoMethod, saltedPassword, 'Client Key');
+  const serverKey = await HMAC(cryptoMethod, saltedPassword, 'Server Key');
+  const storedKey = await H(cryptoMethod, clientKey);
   const authMessage = [
     clientFirstMessageBare(username, nonce),
     payload.toString('utf8'),
     withoutProof
   ].join(',');
 
-  const clientSignature = HMAC(cryptoMethod, storedKey, authMessage);
+  const clientSignature = await HMAC(cryptoMethod, storedKey, authMessage);
   const clientProof = `p=${xor(clientKey, clientSignature)}`;
   const clientFinal = [withoutProof, clientProof].join(',');
 
-  const serverSignature = HMAC(cryptoMethod, serverKey, authMessage);
+  const serverSignature = await HMAC(cryptoMethod, serverKey, authMessage);
   const saslContinueCmd = {
     saslContinue: 1,
     conversationId: response.conversationId,
@@ -229,19 +228,32 @@ function passwordDigest(username: string, password: string) {
     throw new MongoInvalidArgumentError('Password cannot be empty');
   }
 
-  let md5: crypto.Hash;
+  let nodeCrypto;
   try {
-    md5 = crypto.createHash('md5');
+    // TODO: NODE-7424 - remove dependency on 'crypto' for SCRAM-SHA-1 authentication
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
+    nodeCrypto = require('crypto');
+  } catch (e) {
+    throw new MongoRuntimeError(
+      'Node.js crypto module is required for SCRAM-SHA-1 authentication',
+      {
+        cause: e
+      }
+    );
+  }
+
+  try {
+    const md5 = nodeCrypto.createHash('md5');
+    md5.update(`${username}:mongo:${password}`, 'utf8');
+    return md5.digest('hex');
   } catch (err) {
-    if (crypto.getFips()) {
+    if (nodeCrypto.getFips()) {
       // This error is (slightly) more helpful than what comes from OpenSSL directly, e.g.
       // 'Error: error:060800C8:digital envelope routines:EVP_DigestInit_ex:disabled for FIPS'
       throw new Error('Auth mechanism SCRAM-SHA-1 is not supported in FIPS mode');
     }
     throw err;
   }
-  md5.update(`${username}:mongo:${password}`, 'utf8');
-  return md5.digest('hex');
 }
 
 // XOR two buffers
@@ -256,12 +268,28 @@ function xor(a: Uint8Array, b: Uint8Array) {
   return ByteUtils.toBase64(ByteUtils.fromNumberArray(res));
 }
 
-function H(method: CryptoMethod, text: Uint8Array): Uint8Array {
-  return crypto.createHash(method).update(text).digest();
+async function H(method: CryptoMethod, text: Uint8Array): Promise<Uint8Array> {
+  const buffer = await crypto.subtle.digest(method === 'sha256' ? 'SHA-256' : 'SHA-1', text);
+  return new Uint8Array(buffer);
 }
 
-function HMAC(method: CryptoMethod, key: Uint8Array, text: Uint8Array | string): Uint8Array {
-  return crypto.createHmac(method, key).update(text).digest();
+async function HMAC(
+  method: CryptoMethod,
+  key: Uint8Array,
+  text: Uint8Array | string
+): Promise<Uint8Array> {
+  const keyBuffer = ByteUtils.toLocalBufferType(key);
+  const cryptoKey = await crypto.subtle.importKey(
+    'raw',
+    keyBuffer,
+    { name: 'HMAC', hash: { name: method === 'sha256' ? 'SHA-256' : 'SHA-1' } },
+    false,
+    ['sign', 'verify']
+  );
+  const textData: Uint8Array = typeof text === 'string' ? new TextEncoder().encode(text) : text;
+  const textBuffer = ByteUtils.toLocalBufferType(textData);
+  const signature = await crypto.subtle.sign('HMAC', cryptoKey, textBuffer);
+  return new Uint8Array(signature);
 }
 
 interface HICache {
@@ -280,21 +308,32 @@ const hiLengthMap = {
   sha1: 20
 };
 
-function HI(data: string, salt: Uint8Array, iterations: number, cryptoMethod: CryptoMethod) {
+async function HI(data: string, salt: Uint8Array, iterations: number, cryptoMethod: CryptoMethod) {
   // omit the work if already generated
   const key = [data, ByteUtils.toBase64(salt), iterations].join('_');
   if (_hiCache[key] != null) {
     return _hiCache[key];
   }
 
-  // generate the salt
-  const saltedData = crypto.pbkdf2Sync(
-    data,
-    salt,
-    iterations,
-    hiLengthMap[cryptoMethod],
-    cryptoMethod
+  const keyMaterial = await crypto.subtle.importKey(
+    'raw',
+    new TextEncoder().encode(data),
+    { name: 'PBKDF2' },
+    false,
+    ['deriveBits']
+  );
+  const params = {
+    name: 'PBKDF2',
+    salt: salt,
+    iterations: iterations,
+    hash: { name: cryptoMethod === 'sha256' ? 'SHA-256' : 'SHA-1' }
+  };
+  const derivedBits = await crypto.subtle.deriveBits(
+    params,
+    keyMaterial,
+    hiLengthMap[cryptoMethod] * 8
   );
+  const saltedData = new Uint8Array(derivedBits);
 
   // cache a copy to speed up the next lookup, but prevent unbounded cache growth
   if (_hiCacheCount >= 200) {
@@ -311,10 +350,6 @@ function compareDigest(lhs: Uint8Array, rhs: Uint8Array) {
     return false;
   }
 
-  if (typeof crypto.timingSafeEqual === 'function') {
-    return crypto.timingSafeEqual(lhs, rhs);
-  }
-
   let result = 0;
   for (let i = 0; i < lhs.length; i++) {
     result |= lhs[i] ^ rhs[i];

src/utils.ts

@@ -1,4 +1,3 @@
-import * as crypto from 'crypto';
 import type { SrvRecord } from 'dns';
 import { type EventEmitter } from 'events';
 import { promises as fs } from 'fs';
@@ -306,7 +305,7 @@ export function* makeCounter(seed = 0): Generator<number> {
  * @internal
  */
 export function uuidV4(): Uint8Array {
-  const result = crypto.randomBytes(16);
+  const result = crypto.getRandomValues(new Uint8Array(16));
   result[6] = (result[6] & 0x0f) | 0x40;
   result[8] = (result[8] & 0x3f) | 0x80;
   return result;
@@ -1226,13 +1225,8 @@ export function squashError(_error: unknown) {
   return;
 }
 
-export const randomBytes = (size: number) => {
-  return new Promise<Uint8Array>((resolve, reject) => {
-    crypto.randomBytes(size, (error: Error | null, buf: Uint8Array) => {
-      if (error) return reject(error);
-      resolve(buf);
-    });
-  });
+export const randomBytes = (size: number): Promise<Uint8Array> => {
+  return Promise.resolve(crypto.getRandomValues(new Uint8Array(size)));
 };
 
 /**