function pbkdf2(password, salt, iterations, keylen, digest, callback) {
  ...

  handleError(keybuf, password, salt, iterations, digest, wrap);
}

呼叫了：

const rc = _pbkdf2(keybuf, password, salt, iterations, digest, wrap);
 


_pbkdf2綁定了C++函式的實現。
const { pbkdf2: _pbkdf2 } = internalBinding('crypto');

繫結
 env->SetMethod(target, "pbkdf2", PBKDF2);
 inline void PBKDF2(const FunctionCallbackInfo<Value>& args)
 
 {
    ...
   job->iteration_count = args[3].As<Uint32>()->Value();
   Utf8Value digest_name(args.GetIsolate(), args[4]);
   job->digest = EVP_get_digestbyname(*digest_name);
   if (job->digest == nullptr) return rv.Set(-1);
   if (args[5]->IsObject()) return PBKDF2Job::Run(std::move(job), args[5]);
   env->PrintSyncTrace();
   job->DoThreadPoolWork();
   rv.Set(job->ToResult());
 }

 using v8::Array;
 using v8::Boolean;
 using v8::ConstructorBehavior;
 using v8::Context;
 using v8::DontDelete;
...

...
static uv_once_t init_once = UV_ONCE_INIT;
uv_once(&init_once, InitCryptoOnce);