49 lines
1.9 KiB
Java
49 lines
1.9 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.vending.licensing;
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/**
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* Interface used as part of a {@link Policy} to allow application authors to obfuscate
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* licensing data that will be stored into a SharedPreferences file.
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* <p>
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* Any transformation scheme must be reversible. Implementing classes may optionally implement an
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* integrity check to further prevent modification to preference data. Implementing classes
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* should use device-specific information as a key in the obfuscation algorithm to prevent
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* obfuscated preferences from being shared among devices.
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*/
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public interface Obfuscator {
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/**
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* Obfuscate a string that is being stored into shared preferences.
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*
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* @param original The data that is to be obfuscated.
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* @param key The key for the data that is to be obfuscated.
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* @return A transformed version of the original data.
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*/
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String obfuscate(String original, String key);
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/**
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* Undo the transformation applied to data by the obfuscate() method.
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*
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* @param original The data that is to be obfuscated.
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* @param key The key for the data that is to be obfuscated.
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* @return A transformed version of the original data.
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* @throws ValidationException Optionally thrown if a data integrity check fails.
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*/
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String unobfuscate(String obfuscated, String key) throws ValidationException;
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}
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