diff --git a/src/decrypt-worker/crypto/qmc/qmc_v2.ts b/src/decrypt-worker/crypto/qmc/qmc_v2.ts
index c39234a..6996802 100644
--- a/src/decrypt-worker/crypto/qmc/qmc_v2.ts
+++ b/src/decrypt-worker/crypto/qmc/qmc_v2.ts
@@ -4,6 +4,7 @@ import type { DecryptCommandOptions } from '~/decrypt-worker/types.ts';
 import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from './qmc_v2.key.ts';
 import { fetchParakeet } from '@jixun/libparakeet';
 import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder.ts';
+import { makeQMCv2KeyCrypto } from '~/decrypt-worker/util/qmc2KeyCrypto.ts';
 
 export class QMC2Crypto implements CryptoBase {
   cryptoName = 'QMC/v2';
@@ -38,7 +39,7 @@ export class QMC2CryptoWithKey implements CryptoBase {
 
     const parakeet = await fetchParakeet();
     const key = stringToUTF8Bytes(options.qmc2Key);
-    const keyCrypto = parakeet.make.QMCv2KeyCrypto(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);
+    const keyCrypto = makeQMCv2KeyCrypto(parakeet);
     return transformBlob(buffer, (p) => p.make.QMCv2EKey(key, keyCrypto), {
       parakeet,
       cleanup: () => keyCrypto.delete(),
diff --git a/src/decrypt-worker/util/qmc2KeyCrypto.ts b/src/decrypt-worker/util/qmc2KeyCrypto.ts
new file mode 100644
index 0000000..7f534ee
--- /dev/null
+++ b/src/decrypt-worker/util/qmc2KeyCrypto.ts
@@ -0,0 +1,4 @@
+import type { Parakeet } from '@jixun/libparakeet';
+import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from '../crypto/qmc/qmc_v2.key';
+
+export const makeQMCv2KeyCrypto = (p: Parakeet) => p.make.QMCv2KeyCrypto(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);