feat(passkey-crypto): add @bitgo/passkey-crypto package

derranW26 · derranW26 · commit e57cafc367d0 · 2026-04-21T21:53:50.000-04:00
Pure cryptographic primitives for WebAuthn PRF-based key derivation: - derivePassword: converts ArrayBuffer PRF result to hex walletPassphrase - deriveEnterpriseSalt: HMAC-SHA256(baseSalt, enterpriseId) for cross-enterprise isolation TICKET: WCN-186
diff --git a/modules/passkey-crypto/.mocharc.yml b/modules/passkey-crypto/.mocharc.yml
@@ -0,0 +1,8 @@
+require: 'tsx'
+timeout: '20000'
+reporter: 'min'
+reporter-option:
+  - 'cdn=true'
+  - 'json=false'
+exit: true
+spec: ['test/unit/**/*.ts']
diff --git a/modules/passkey-crypto/package.json b/modules/passkey-crypto/package.json
@@ -0,0 +1,42 @@
+{
+  "name": "@bitgo/passkey-crypto",
+  "version": "1.0.0",
+  "description": "Pure cryptographic primitives for BitGo passkey (WebAuthn PRF) key derivation",
+  "main": "./dist/src/index.js",
+  "types": "./dist/src/index.d.ts",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "yarn tsc --build --incremental --verbose .",
+    "fmt": "prettier --write .",
+    "check-fmt": "prettier --check '**/*.{ts,js,json}'",
+    "clean": "rm -r ./dist",
+    "lint": "eslint --quiet .",
+    "prepare": "npm run build",
+    "test": "npm run unit-test",
+    "unit-test": "mocha 'test/unit/**/*.ts'"
+  },
+  "author": "BitGo SDK Team <sdkteam@bitgo.com>",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/BitGo/BitGoJS.git",
+    "directory": "modules/passkey-crypto"
+  },
+  "lint-staged": {
+    "*.{js,ts}": [
+      "yarn prettier --write",
+      "yarn eslint --fix"
+    ]
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "devDependencies": {
+    "@types/node": "^18.0.0",
+    "mocha": "^10.0.0",
+    "ts-node": "^10.0.0",
+    "typescript": "~5.4.5"
+  }
+}
diff --git a/modules/passkey-crypto/src/deriveEnterpriseSalt.ts b/modules/passkey-crypto/src/deriveEnterpriseSalt.ts
@@ -0,0 +1,15 @@
+import { createHmac } from 'crypto';
+
+/**
+ * Derives an enterprise-scoped salt to prevent cross-enterprise key reuse.
+ *
+ * Computes HMAC-SHA256(baseSalt, enterpriseId) as a hex string.
+ * The baseSalt must always come from the server — never generate it client-side.
+ *
+ * @param baseSalt - Server-provided base salt
+ * @param enterpriseId - Enterprise identifier
+ * @returns Hex-encoded HMAC-SHA256 digest
+ */
+export function deriveEnterpriseSalt(baseSalt: string, enterpriseId: string): string {
+  return createHmac('sha256', baseSalt).update(enterpriseId).digest('hex');
+}
diff --git a/modules/passkey-crypto/src/derivePassword.ts b/modules/passkey-crypto/src/derivePassword.ts
@@ -0,0 +1,12 @@
+/**
+ * Derives a wallet passphrase from a WebAuthn PRF result.
+ *
+ * The PRF output (ArrayBuffer) is hex-encoded and used directly as the
+ * walletPassphrase for SJCL-based encryption (bitgo.encrypt).
+ *
+ * @param prfResult - Raw PRF output from WebAuthn credential assertion
+ * @returns Lowercase hex string to use as walletPassphrase
+ */
+export function derivePassword(prfResult: ArrayBuffer): string {
+  return Buffer.from(prfResult).toString('hex');
+}
diff --git a/modules/passkey-crypto/src/index.ts b/modules/passkey-crypto/src/index.ts
@@ -0,0 +1,2 @@
+export { derivePassword } from './derivePassword';
+export { deriveEnterpriseSalt } from './deriveEnterpriseSalt';
diff --git a/modules/passkey-crypto/test/unit/deriveEnterpriseSalt.test.ts b/modules/passkey-crypto/test/unit/deriveEnterpriseSalt.test.ts
@@ -0,0 +1,39 @@
+import * as assert from 'assert';
+import { createHmac } from 'crypto';
+import { deriveEnterpriseSalt } from '../../src';
+
+describe('deriveEnterpriseSalt', function () {
+  const BASE_SALT = 'server-provided-base-salt';
+  const ENTERPRISE_ID = 'ent-abc123';
+
+  it('returns a hex string', function () {
+    const result = deriveEnterpriseSalt(BASE_SALT, ENTERPRISE_ID);
+    assert.match(result, /^[0-9a-f]+$/);
+  });
+
+  it('returns a 64-character string (SHA-256 = 32 bytes = 64 hex chars)', function () {
+    const result = deriveEnterpriseSalt(BASE_SALT, ENTERPRISE_ID);
+    assert.strictEqual(result.length, 64);
+  });
+
+  it('matches a known HMAC-SHA256 test vector', function () {
+    const expected = createHmac('sha256', BASE_SALT).update(ENTERPRISE_ID).digest('hex');
+    assert.strictEqual(deriveEnterpriseSalt(BASE_SALT, ENTERPRISE_ID), expected);
+  });
+
+  it('is deterministic — same inputs produce same output', function () {
+    assert.strictEqual(deriveEnterpriseSalt(BASE_SALT, ENTERPRISE_ID), deriveEnterpriseSalt(BASE_SALT, ENTERPRISE_ID));
+  });
+
+  it('produces different output for different enterprise IDs', function () {
+    const a = deriveEnterpriseSalt(BASE_SALT, 'ent-aaa');
+    const b = deriveEnterpriseSalt(BASE_SALT, 'ent-bbb');
+    assert.notStrictEqual(a, b);
+  });
+
+  it('produces different output for different base salts', function () {
+    const a = deriveEnterpriseSalt('salt-one', ENTERPRISE_ID);
+    const b = deriveEnterpriseSalt('salt-two', ENTERPRISE_ID);
+    assert.notStrictEqual(a, b);
+  });
+});
diff --git a/modules/passkey-crypto/test/unit/derivePassword.test.ts b/modules/passkey-crypto/test/unit/derivePassword.test.ts
@@ -0,0 +1,30 @@
+import * as assert from 'assert';
+import { derivePassword } from '../../src';
+
+describe('derivePassword', function () {
+  it('converts an ArrayBuffer of zeros to a hex string of zeros', function () {
+    const input = new ArrayBuffer(4);
+    assert.strictEqual(derivePassword(input), '00000000');
+  });
+
+  it('converts known bytes to expected hex', function () {
+    const input = new Uint8Array([0xde, 0xad, 0xbe, 0xef]).buffer;
+    assert.strictEqual(derivePassword(input), 'deadbeef');
+  });
+
+  it('returns a lowercase hex string', function () {
+    const input = new Uint8Array([0xab, 0xcd]).buffer;
+    const result = derivePassword(input);
+    assert.strictEqual(result, result.toLowerCase());
+  });
+
+  it('returns a string of length 2x the input byte length', function () {
+    const input = new ArrayBuffer(32);
+    assert.strictEqual(derivePassword(input).length, 64);
+  });
+
+  it('produces the same output for the same input (deterministic)', function () {
+    const input = new Uint8Array([1, 2, 3, 4, 5]).buffer;
+    assert.strictEqual(derivePassword(input), derivePassword(input));
+  });
+});
diff --git a/modules/passkey-crypto/tsconfig.json b/modules/passkey-crypto/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./",
+    "strictPropertyInitialization": false,
+    "esModuleInterop": true,
+    "typeRoots": ["../../types", "./node_modules/@types", "../../node_modules/@types"]
+  },
+  "include": ["src/**/*", "test/**/*"],
+  "exclude": ["node_modules"]
+}
diff --git a/yarn.lock b/yarn.lock
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 yocto-queue@^0.1.0:
   version "0.1.0"
   resolved "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz"

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+export { derivePassword } from './derivePassword';`
	`2`	`+export { deriveEnterpriseSalt } from './deriveEnterpriseSalt';`