是的,Android Keystore和'Settings”应用程序中的'清除数据”操作是相关的。清除数据操作会删除应用程序的所有数据,包括使用Android密钥库存储的密钥。因此,在执行该操作之前,应该备份并保持所有重要数据。同时,在使用Keystore时,需要使用KeyProtection类来设置保护密钥的级别,并使用KeyGenParameterSpec类来配置密钥生成器。
以下是一个简单的示例代码,说明如何使用Keystore和KeyGenerator类生成保护密钥以及如何在清除数据后恢复该密钥:
// Generate and save a key in the Keystore KeyGenerator keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore"); KeyGenParameterSpec keyGenParameterSpec = new KeyGenParameterSpec.Builder("myKeyAlias", KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT).setBlockModes(KeyProperties.BLOCK_MODE_GCM).setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE).setUserAuthenticationRequired(true).build(); keyGenerator.init(keyGenParameterSpec); SecretKey secretKey = keyGenerator.generateKey();
// Get the key from the Keystore KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore"); keyStore.load(null); SecretKey secretKey = (SecretKey) keyStore.getKey("myKeyAlias", null);
// Backup the key for restoration after clearing data byte[] keyBytes = secretKey.getEncoded();
// Clear all data for the app ActivityCompat.clearApplicationUserData();
// Restore the key from backup SecretKey restoredKey = new SecretKeySpec(keyBytes, KeyProperties.KEY_ALGORITHM_AES); KeyStore.Entry entry = new KeyStore.SecretKeyEntry(restoredKey); KeyStore.ProtectionParameter parameter = new KeyStore.PasswordProtection(KEYSTORE_PASSWORD.toCharArray()); keyStore.setEntry("myKeyAlias", entry, parameter);