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/*
* Copyright 2017 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.
*/
package android.privacy;
/**
* An interface for differential privacy encoder.
* Applications can use it to convert privacy sensitive data to privacy protected report.
* There is no decoder implemented in Android as it is not possible decode a single report by
* design.
*
* <p>Each type of log should have its own encoder, otherwise it may leak
* some information about Permanent Randomized Response(PRR, is used to create a “noisy”
* answer which is memoized by the client and permanently reused in place of the real answer).
*
* <p>Some encoders may not support all encoding methods, and it will throw {@link
* UnsupportedOperationException} if you call unsupported encoding method.
*
* <p><b>WARNING:</b> Privacy protection works only when encoder uses a suitable DP configuration,
* and the configuration and algorithm that is suitable is highly dependent on the use case.
* If the configuration is not suitable for the use case, it may hurt privacy or utility or both.
*
* @hide
*/
public interface DifferentialPrivacyEncoder {
/**
* Apply differential privacy to encode a string.
*
* @param original An arbitrary string
* @return Differential privacy encoded bytes derived from the string
*/
byte[] encodeString(String original);
/**
* Apply differential privacy to encode a boolean.
*
* @param original An arbitrary boolean.
* @return Differential privacy encoded bytes derived from the boolean
*/
byte[] encodeBoolean(boolean original);
/**
* Apply differential privacy to encode sequence of bytes.
*
* @param original An arbitrary byte array.
* @return Differential privacy encoded bytes derived from the bytes
*/
byte[] encodeBits(byte[] original);
/**
* Returns the configuration that this encoder is using.
*/
DifferentialPrivacyConfig getConfig();
/**
* Return True if the output from encoder is NOT securely randomized, otherwise encoder should
* be secure to randomize input.
*
* <b> A non-secure encoder is intended only for testing only and must not be used to process
* real data.
* </b>
*/
boolean isInsecureEncoderForTest();
}
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