java.security.UnrecoverableKeyException： 未能获取有关私钥的信息

此错误何时发生，为什么？

答：从密钥库加载 Android 密钥并存储公钥时，如果状态已锁定或未初始化，则可能会发生此错误。

生成部分代码的错误如下：

@NonNull
    public static AndroidKeyStorePublicKey loadAndroidKeyStorePublicKeyFromKeystore(
            @NonNull KeyStore keyStore, @NonNull String privateKeyAlias)
            throws UnrecoverableKeyException {
        KeyCharacteristics keyCharacteristics = new KeyCharacteristics();
        int errorCode = keyStore.getKeyCharacteristics(privateKeyAlias, null,
                null, keyCharacteristics);
        if (errorCode != KeyStore.NO_ERROR) {
            throw (UnrecoverableKeyException) new UnrecoverableKeyException(
                    "Failed to obtain information about private key")
                    .initCause(KeyStore.getKeyStoreException(errorCode)); // this exception is generated
        }
        ......
        ......
        ......
    }

密钥库有 10 个响应代码。他们是

// ResponseCodes
NO_ERROR = 1;
LOCKED = 2;
UNINITIALIZED = 3;
SYSTEM_ERROR = 4;
PROTOCOL_ERROR = 5;
PERMISSION_DENIED = 6;
KEY_NOT_FOUND = 7;
VALUE_CORRUPTED = 8;
UNDEFINED_ACTION = 9;
WRONG_PASSWORD = 10;

密钥库有 3 种状态。它们已解锁、已锁定、未初始化

仅当状态为“未锁定”时，才会发生NO_ERROR。对于升级情况，首次状态为“锁定”或“未初始化”，因此错误只发生一次。

状态检查代码如下：

public State state() {
    execute('t');
    switch (mError) {
    case NO_ERROR:
        return State.UNLOCKED;
    case LOCKED:
        return State.LOCKED;
    case UNINITIALIZED:
        return State.UNINITIALIZED;
    default:
        throw new AssertionError(mError);
    }
}

资源链接：

1. AndroidKeyStoreProvider java class
2. 密钥库 java 类

更新：

从您的错误日志中，现在很明显

W/System.err﹕ Caused by: android.security.KeyStoreException: Invalid key blob

这是当用户尝试从锁定/未初始化解锁时导致的主要问题。默认情况下，它被定义为 30 秒的计时。这个问题是与API相关的实现问题。

/**
 * If the user has unlocked the device Within the last this number of seconds,
 * it can be considered as an authenticator.
 */
private static final int AUTHENTICATION_DURATION_SECONDS = 30;

对于加密/解密，仅当用户刚刚通过设备凭据进行身份验证时，使用生成的密钥的某些数据才有效。错误发生在

// Try encrypting something, it will only work if the user authenticated within
// the last AUTHENTICATION_DURATION_SECONDS seconds.
cipher.init(Cipher.ENCRYPT_MODE, secretKey); // error is generated from here.

实际错误是从这里引发的。错误由 生成自 。InvalidKeyException

溶液：

您必须从 catch 参数中删除该类。这仍将允许您检查 .检查后，您必须第二次尝试使用代码，以便问题不会显示在眼睛中，但进行2次检查可能会解决您的问题。我还没有测试代码，但应该如下所示：InvalidKeyExceptionInvalidKeyException

try {
....
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) this.keyStore.getEntry("alias", null);
....
} catch (final Exception e) {
    e.printStackTrace();
    if (e instanceof InvalidKeyException) { // bypass InvalidKeyException
        .......
        // You can again call the method and make a counter for deadlock situation or implement your own code according to your situation
        if (retry) {
            keyStore.deleteEntry(keyName);
            return getCypher(keyName, false);
        } else {
            throw e;
        }
    }
}

资源链接：

1. 主要活动.java
2. android.security.KeyStoreException： Invalid key blob

更新（2020年8月）：

将安全库更新到版本可以为我解决问题。1.0.0-rc03

在长乐日志中，他们提到：

Tink 更新应正常处理 AndroidKeyStore 并发故障。

旧答案：

在问题跟踪器上有一个悬而未决的问题

这是一位谷歌工程师的回复

AndroidKeyStore的某些OEM实现已损坏，无法正常工作。不幸的是，Jetpack Security依靠AndroidKeyStore来安全地存储和生成密钥。如果这不起作用，您所能做的就是信任出现故障的设备，减少并且不使用加密。理想情况下，在库中进行检查以查找这些问题会很好，这样您就可以在不随机崩溃的情况下了解这一点。

我写了一个测试类，在此期间你可以用它来测试密钥库。基本上，您必须进行端到端加密/解密才能知道设备密钥库是否完全正常工作。

https://gist.github.com/jmarkoff/44f5a9cab1a881c8b0abc787791add08

/*
 * Copyright 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//packgage com.company.app

import android.content.Context;
import android.content.SharedPreferences;
import android.security.keystore.KeyGenParameterSpec;
import android.util.Log;

import androidx.annotation.NonNull;
import androidx.security.crypto.MasterKeys;
import androidx.security.crypto.EncryptedSharedPreferences;

import java.io.IOException;
import java.security.GeneralSecurityException;

/**
 * Convenient method to test the Android Keystore before using encryption/decryption. A small number
 * OEMs have devices with a bad keystore and KeyStore exceptions will occur.
 *
 * Requires Jetpack Security - https://developer.android.com/jetpack/androidx/releases/security
 *
 * Bugs:
 *
 * https://issuetracker.google.com/issues/147480931
 * https://issuetracker.google.com/issues/134417365
 * https://issuetracker.google.com/issues/150221071
 *
 */
public final class TestKeyStore {

     /**
     * Test the keystore, encryption and decryption on the device. This is useful to find devices
     * that have a bad keystore and encryption should not be used. It is up to the developer to
     * decide how to handle when a bad keystore is encountered. We recommend that the device be
     * trusted less by your app if possible.
     *
     * @param keyGenParameterSpec The key encryption scheme
     * @return true if the keystore can be relied on, false otherwise
     */
    public static boolean trustDeviceKeyStore(@NonNull KeyGenParameterSpec keyGenParameterSpec,
            @NonNull Context context) {
        try {
            String keyAlias = MasterKeys.getOrCreate(keyGenParameterSpec);
            SharedPreferences sharedPreferences =
                    EncryptedSharedPreferences.create("test_keystore", keyAlias,
                            context,
                            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
                            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM);
            SharedPreferences.Editor editor = sharedPreferences.edit();
            editor.putString("TestKeyStore", "Testing");
            editor.commit();
            String value = sharedPreferences.getString("TestKeyStore", "Failed");
            if (value.equals("Testing")) {
                return true;
            }
        } catch (GeneralSecurityException ex) {
            Log.e(TestKeyStore.class.getSimpleName(),
                    "SecurityException: Could be a keystore issue, check the error for more "
                            + "details message: " + ex.getMessage() + ".\n Stacktrace:\n"
                            + ex.getStackTrace().toString());
        } catch (IOException ex) {
            Log.e(TestKeyStore.class.getSimpleName(),
                    "IOException: Check to make sure you have enough disk space and that the "
                            + "file doesn't exist." + ex.getMessage());
        }
        return false;
    }

}