feat(store): 添加门店、门店验证

apps/api/src/stores/store-secret.crypto.ts

@@ -1,4 +1,5 @@
 import {
+    createDecipheriv,
     createCipheriv,
     createHash,
     createHmac,
@@ -35,3 +36,23 @@ export function encryptStoreSecret(
             .digest('base64url'),
     };
 }
+
+/** 仅供受信任的后台 Worker 使用；调用方不得记录返回值。 */
+export function decryptStoreSecret(
+    ciphertextWithTag: Buffer,
+    nonce: Buffer,
+    keyMaterial: string,
+): string {
+    const authenticationTagLength = 16;
+    if (ciphertextWithTag.length <= authenticationTagLength) {
+        throw new Error('Invalid encrypted store secret');
+    }
+    const key = createHash('sha256').update(keyMaterial).digest();
+    const ciphertext = ciphertextWithTag.subarray(0, -authenticationTagLength);
+    const tag = ciphertextWithTag.subarray(-authenticationTagLength);
+    const decipher = createDecipheriv('aes-256-gcm', key, nonce);
+    decipher.setAuthTag(tag);
+    return Buffer.concat([decipher.update(ciphertext), decipher.final()]).toString(
+        'utf8',
+    );
+}