diff --git a/.gitignore b/.gitignore
index dfe1a7a3b..7759c0f70 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,8 @@ dist/
 *.tsbuildinfo
 *.hydro
 .coverage
+coverage
+.nyc_output
 benchmark.json
 globalConfig.json
 *.out
diff --git a/.nycrc.yml b/.nycrc.yml
new file mode 100644
index 000000000..da591363b
--- /dev/null
+++ b/.nycrc.yml
@@ -0,0 +1,3 @@
+extension: [.js, .ts, .jsx, .tsx]
+exclude: [node_modules, .yarn]
+reporter: [text, lcov]
\ No newline at end of file
diff --git a/package.json b/package.json
index c52597ead..b7081d0da 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,7 @@
         "mocha": "^10.0.0",
         "mongodb": "^3.7.3",
         "mongodb-memory-server": "^8.8.0",
+        "nyc": "^15.1.0",
         "ora": "^6.1.2",
         "semver": "^7.3.7",
         "supertest": "^6.2.4",
diff --git a/packages/hydrojudge/package.json b/packages/hydrojudge/package.json
index d1648025b..f74df1e72 100644
--- a/packages/hydrojudge/package.json
+++ b/packages/hydrojudge/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.22.11",
+    "version": "2.22.12",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",
diff --git a/packages/hydrojudge/src/utils.ts b/packages/hydrojudge/src/utils.ts
index 38050b48e..5bf8adec7 100644
--- a/packages/hydrojudge/src/utils.ts
+++ b/packages/hydrojudge/src/utils.ts
@@ -1,4 +1,3 @@
-import crypto from 'crypto';
 import { EventEmitter } from 'events';
 import path from 'path';
 import fs from 'fs-extra';
@@ -16,14 +15,6 @@ export function parseFilename(filePath: string) {
     return t[t.length - 1];
 }
 
-const encrypt = (algorithm: string, content: crypto.BinaryLike) => {
-    const hash = crypto.createHash(algorithm);
-    hash.update(content);
-    return hash.digest('hex');
-};
-
-export const md5 = (content: string) => encrypt('md5', content);
-
 export class Queue<T> extends EventEmitter {
     queue: T[] = [];
     waiting: any[] = [];