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125 changes: 125 additions & 0 deletions
125
common/src/main/java/org/conscrypt/DuckTypedHpkeSpi.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| * Copyright (C) 2023 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 | ||
| */ | ||
|
|
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| package org.conscrypt; | ||
|
|
||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.security.GeneralSecurityException; | ||
| import java.security.InvalidKeyException; | ||
| import java.security.PrivateKey; | ||
| import java.security.PublicKey; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
|
||
| /** | ||
| * Duck typed implementation of {@link HpkeSpi}. | ||
| * <p> | ||
| * Will wrap any Object which implements all of the methods in HpkeSpi and delegate to them | ||
| * by reflection. | ||
| */ | ||
| @Internal | ||
| public class DuckTypedHpkeSpi implements HpkeSpi { | ||
| private final Object delegate; | ||
| private final Map<String, Method> methods = new HashMap<>(); | ||
|
|
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| private DuckTypedHpkeSpi(Object delegate) throws NoSuchMethodException { | ||
| this.delegate = delegate; | ||
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|
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| Class<?> sourceClass = delegate.getClass(); | ||
| for (Method targetMethod : HpkeSpi.class.getMethods()) { | ||
| if (targetMethod.isSynthetic()) { | ||
| continue; | ||
| } | ||
|
|
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| Method sourceMethod = | ||
| sourceClass.getMethod(targetMethod.getName(), targetMethod.getParameterTypes()); | ||
| // Check that the return types match too. | ||
| Class<?> sourceReturnType = sourceMethod.getReturnType(); | ||
| Class<?> targetReturnType = targetMethod.getReturnType(); | ||
| if (!targetReturnType.isAssignableFrom(sourceReturnType)) { | ||
| throw new NoSuchMethodException(sourceMethod + " return value (" + sourceReturnType | ||
| + ") incompatible with target return value (" + targetReturnType + ")"); | ||
| } | ||
| methods.put(sourceMethod.getName(), sourceMethod); | ||
| } | ||
| } | ||
|
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| public static DuckTypedHpkeSpi newInstance(Object delegate) { | ||
| try { | ||
| return new DuckTypedHpkeSpi(delegate); | ||
| } catch (Exception ignored) { | ||
| return null; | ||
| } | ||
| } | ||
|
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| private Object invoke(String methodName, Object... args) { | ||
| Method method = methods.get(methodName); | ||
| if (method == null) { | ||
| throw new IllegalStateException("DuckTypedHpkSpi internal error"); | ||
| } | ||
| try { | ||
| return method.invoke(delegate, args); | ||
| } catch (InvocationTargetException | IllegalAccessException e) { | ||
| throw new IllegalStateException("DuckTypedHpkSpi internal error", e); | ||
| } | ||
| } | ||
|
|
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| // Visible for testing | ||
| public Object getDelegate() { | ||
| return delegate; | ||
| } | ||
|
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| @Override | ||
| public void engineInitSender( | ||
| PublicKey recipientKey, byte[] info, PrivateKey senderKey, byte[] psk, byte[] psk_id) | ||
| throws InvalidKeyException { | ||
| invoke("engineInitSender", recipientKey, info, senderKey, psk, psk_id); | ||
| } | ||
|
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| @Override | ||
| public void engineInitSenderForTesting(PublicKey recipientKey, byte[] info, PrivateKey senderKey, | ||
| byte[] psk, byte[] psk_id, byte[] sKe) throws InvalidKeyException { | ||
| invoke("engineInitSenderForTesting", | ||
| recipientKey, info, senderKey, psk, psk_id, sKe); | ||
| } | ||
|
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| @Override | ||
| public void engineInitRecipient(byte[] encapsulated, PrivateKey key, byte[] info, | ||
| PublicKey senderKey, byte[] psk, byte[] psk_id) throws InvalidKeyException { | ||
| invoke("engineInitRecipient", encapsulated, key, info, senderKey, psk, psk_id); | ||
| } | ||
|
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| @Override | ||
| public byte[] engineSeal(byte[] plaintext, byte[] aad) { | ||
| return (byte[]) invoke("engineSeal", plaintext, aad); | ||
| } | ||
|
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| @Override | ||
| public byte[] engineExport(int length, byte[] exporterContext) { | ||
| return (byte[]) invoke("engineExport", length, exporterContext); | ||
| } | ||
|
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| @Override | ||
| public byte[] engineOpen(byte[] ciphertext, byte[] aad) throws GeneralSecurityException { | ||
| return (byte[]) invoke("engineOpen", ciphertext, aad); | ||
| } | ||
|
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| @Override | ||
| public byte[] getEncapsulated() { | ||
| return (byte[]) invoke("getEncapsulated"); | ||
| } | ||
| } |
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