如何在Android密钥库中存储对称密钥

import android.security.keystore.KeyGenParameterSpec;
import android.security.keystore.KeyProperties;
import java.security.KeyStore;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

// 生成对称密钥
KeyGenerator keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
keyGenerator.init(new KeyGenParameterSpec.Builder("myKeyAlias", KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
        .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
        .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
        .setRandomizedEncryptionRequired(false)
        .build());
SecretKey secretKey = keyGenerator.generateKey();

// 创建KeyStore实例
KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);

// 生成密钥条目
KeyStore.SecretKeyEntry secretKeyEntry = new KeyStore.SecretKeyEntry(secretKey);
keyStore.setEntry("myKeyAlias", secretKeyEntry, null);

// 保存KeyStore
keyStore.store(new FileOutputStream("path/to/keystore"), null);