Checks if a key has already been create - Android java.security

Android examples for java.security:KeyStore

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Description

Checks if a key has already been create

Demo Code

/*// ww w  .ja  v a 2 s .  c o m
 * Copyright 2016 Thomas Hoffmann
 *
 * 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.
 */
//package com.java2s;

import java.security.KeyStore;

import javax.crypto.SecretKey;

public class Main {
    /**
     * Alias for our key in the Android Key Store
     */
    private static final String KEY_NAME = "my_key";
    private static KeyStore mKeyStore;

    /**
     * Checks if a key has already been create
     *
     * @return true, if a key is already created
     */
    private static boolean hasKey() {
        try {
            mKeyStore.load(null);
            SecretKey key = (SecretKey) mKeyStore.getKey(KEY_NAME, null);
            return key != null;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
}

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