尝试在Java中初始化Bouncy Castle密码时，密钥长度不是128/192/256位

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.Security;

public class BouncyCastleExample {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        String algorithm = "AES";
        int keySize = 128; // 密钥长度

        // 生成密钥
        byte[] keyBytes = new byte[keySize / 8];
        // TODO: 生成密钥的代码

        // 初始化密码
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, algorithm);
        Cipher cipher = Cipher.getInstance(algorithm, "BC");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);

        // 其他操作...
    }
}