groombook-engineer[bot]
f4acf5be23
Renumbered migration 0021 → 0023 to resolve conflict with pet_image and logo_key migrations that landed on main after this branch was created. Co-Authored-By: Paperclip <noreply@paperclip.ing>
82 lines
2.6 KiB
TypeScript
82 lines
2.6 KiB
TypeScript
import { createCipheriv, createDecipheriv, randomBytes, scryptSync } from "node:crypto";
|
|
|
|
const ALGORITHM = "aes-256-gcm";
|
|
const IV_LENGTH = 12; // 96-bit IV for GCM
|
|
const AUTH_TAG_LENGTH = 16; // 128-bit auth tag
|
|
const SALT_LENGTH = 16;
|
|
|
|
/**
|
|
* Derives a 32-byte key from BETTER_AUTH_SECRET using scrypt.
|
|
* BETTER_AUTH_SECRET is used as the password, with a fixed salt derived from the package name.
|
|
*/
|
|
function deriveKey(secret: string): Buffer {
|
|
// Use a fixed salt derived from the package name for key derivation
|
|
// This gives us stable key derivation without storing an extra salt
|
|
const packageSalt = scryptSync("groombook-auth-provider-config", "", SALT_LENGTH);
|
|
return scryptSync(secret, packageSalt, 32);
|
|
}
|
|
|
|
/**
|
|
* Encrypts a plaintext string using AES-256-GCM.
|
|
* Returns a base64-encoded string in the format: iv:ciphertext:authTag
|
|
*/
|
|
export function encryptSecret(plaintext: string): string {
|
|
const secret = process.env.BETTER_AUTH_SECRET;
|
|
if (!secret) {
|
|
throw new Error("BETTER_AUTH_SECRET environment variable is required");
|
|
}
|
|
|
|
const key = deriveKey(secret);
|
|
const iv = randomBytes(IV_LENGTH);
|
|
|
|
const cipher = createCipheriv(ALGORITHM, key, iv, {
|
|
authTagLength: AUTH_TAG_LENGTH,
|
|
});
|
|
|
|
let ciphertext = cipher.update(plaintext, "utf8");
|
|
ciphertext = Buffer.concat([ciphertext, cipher.final()]);
|
|
|
|
const authTag = cipher.getAuthTag();
|
|
|
|
// Format: base64(iv):base64(ciphertext):base64(authTag)
|
|
return [
|
|
iv.toString("base64"),
|
|
ciphertext.toString("base64"),
|
|
authTag.toString("base64"),
|
|
].join(":");
|
|
}
|
|
|
|
/**
|
|
* Decrypts a ciphertext string produced by encryptSecret.
|
|
* Expects the format: iv:ciphertext:authTag (all base64-encoded)
|
|
*/
|
|
export function decryptSecret(encrypted: string): string {
|
|
const secret = process.env.BETTER_AUTH_SECRET;
|
|
if (!secret) {
|
|
throw new Error("BETTER_AUTH_SECRET environment variable is required");
|
|
}
|
|
|
|
const parts = encrypted.split(":");
|
|
if (parts.length !== 3) {
|
|
throw new Error("Invalid encrypted value format: expected iv:ciphertext:authTag");
|
|
}
|
|
|
|
const ivBase64 = parts[0]!;
|
|
const ciphertextBase64 = parts[1]!;
|
|
const authTagBase64 = parts[2]!;
|
|
const iv = Buffer.from(ivBase64, "base64");
|
|
const ciphertext = Buffer.from(ciphertextBase64, "base64");
|
|
const authTag = Buffer.from(authTagBase64, "base64");
|
|
|
|
const key = deriveKey(secret);
|
|
|
|
const decipher = createDecipheriv(ALGORITHM, key, iv, {
|
|
authTagLength: AUTH_TAG_LENGTH,
|
|
});
|
|
decipher.setAuthTag(authTag);
|
|
|
|
let plaintext = decipher.update(ciphertext);
|
|
plaintext = Buffer.concat([plaintext, decipher.final()]);
|
|
|
|
return plaintext.toString("utf8");
|
|
} |