updating types

apps/auth/src/password.ts

@@ -0,0 +1,39 @@
+/**
+ * Password hashing for /account/me/changepassword. PBKDF2-SHA256 with a random
+ * per-password salt, stored as `salt:hash` (both base64). Not login-critical yet
+ * (login is account-id based), but we never store the raw password.
+ */
+const ITERATIONS = 100_000
+
+const b64 = (bytes: Uint8Array): string => btoa(String.fromCharCode(...bytes))
+const fromB64 = (s: string): Uint8Array => Uint8Array.from(atob(s), (ch) => ch.charCodeAt(0))
+
+async function deriveBits(password: string, salt: Uint8Array): Promise<Uint8Array> {
+	const keyMaterial = await crypto.subtle.importKey(
+		'raw',
+		new TextEncoder().encode(password),
+		'PBKDF2',
+		false,
+		['deriveBits']
+	)
+	const bits = await crypto.subtle.deriveBits(
+		{ name: 'PBKDF2', salt, iterations: ITERATIONS, hash: 'SHA-256' },
+		keyMaterial,
+		256
+	)
+	return new Uint8Array(bits)
+}
+
+/** Hash a password into a `salt:hash` string (both base64). */
+export async function hashPassword(password: string): Promise<string> {
+	const salt = crypto.getRandomValues(new Uint8Array(16))
+	return `${b64(salt)}:${b64(await deriveBits(password, salt))}`
+}
+
+/** Verify a password against a stored `salt:hash`. */
+export async function verifyPassword(password: string, stored: string): Promise<boolean> {
+	const [saltB64, hashB64] = stored.split(':')
+	if (!saltB64 || !hashB64) return false
+	const actual = b64(await deriveBits(password, fromB64(saltB64)))
+	return actual === hashB64
+}