6def5afcbc
This avoids loading all AndroidKeyStore crypto SPI classes when the AndroidKeyStore provider is instantiated and installed. This provider is installed early on during the initialization of each app. Most apps don't need these classes loaded. Bug: 18088752 Change-Id: Ib43c9dd6a7d434b128916e0f9c8652ba61df0d47
118 lines
4.7 KiB
Java
118 lines
4.7 KiB
Java
/*
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* Copyright (C) 2012 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 android.security;
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import java.security.Provider;
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import javax.crypto.Cipher;
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import javax.crypto.Mac;
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/**
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* A provider focused on providing JCA interfaces for the Android KeyStore.
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*
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* @hide
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*/
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public class AndroidKeyStoreProvider extends Provider {
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public static final String PROVIDER_NAME = "AndroidKeyStore";
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// IMPLEMENTATION NOTE: Class names are hard-coded in this provider to avoid loading these
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// classes when this provider is instantiated and installed early on during each app's
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// initialization process.
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private static final String PACKAGE_NAME = "android.security";
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private static final String KEYSTORE_SECRET_KEY_CLASS_NAME =
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PACKAGE_NAME + ".KeyStoreSecretKey";
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public AndroidKeyStoreProvider() {
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super(PROVIDER_NAME, 1.0, "Android KeyStore security provider");
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// java.security.KeyStore
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put("KeyStore.AndroidKeyStore", PACKAGE_NAME + ".AndroidKeyStore");
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// java.security.KeyPairGenerator
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put("KeyPairGenerator.EC", PACKAGE_NAME + ".AndroidKeyPairGenerator$EC");
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put("KeyPairGenerator.RSA", PACKAGE_NAME + ".AndroidKeyPairGenerator$RSA");
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// javax.crypto.KeyGenerator
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put("KeyGenerator.AES", PACKAGE_NAME + ".KeyStoreKeyGeneratorSpi$AES");
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put("KeyGenerator.HmacSHA256", PACKAGE_NAME + ".KeyStoreKeyGeneratorSpi$HmacSHA256");
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// java.security.SecretKeyFactory
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put("SecretKeyFactory.AES", PACKAGE_NAME + ".KeyStoreSecretKeyFactorySpi");
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put("SecretKeyFactory.HmacSHA256", PACKAGE_NAME + ".KeyStoreSecretKeyFactorySpi");
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// javax.crypto.Mac
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putMacImpl("HmacSHA256", PACKAGE_NAME + ".KeyStoreHmacSpi$HmacSHA256");
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// javax.crypto.Cipher
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putSymmetricCipherImpl("AES/ECB/NoPadding",
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PACKAGE_NAME + ".KeyStoreCipherSpi$AES$ECB$NoPadding");
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putSymmetricCipherImpl("AES/ECB/PKCS7Padding",
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PACKAGE_NAME + ".KeyStoreCipherSpi$AES$ECB$PKCS7Padding");
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putSymmetricCipherImpl("AES/CBC/NoPadding",
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PACKAGE_NAME + ".KeyStoreCipherSpi$AES$CBC$NoPadding");
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putSymmetricCipherImpl("AES/CBC/PKCS7Padding",
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PACKAGE_NAME + ".KeyStoreCipherSpi$AES$CBC$PKCS7Padding");
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putSymmetricCipherImpl("AES/CTR/NoPadding",
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PACKAGE_NAME + ".KeyStoreCipherSpi$AES$CTR$NoPadding");
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}
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private void putMacImpl(String algorithm, String implClass) {
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put("Mac." + algorithm, implClass);
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put("Mac." + algorithm + " SupportedKeyClasses", KEYSTORE_SECRET_KEY_CLASS_NAME);
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}
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private void putSymmetricCipherImpl(String transformation, String implClass) {
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put("Cipher." + transformation, implClass);
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put("Cipher." + transformation + " SupportedKeyClasses", KEYSTORE_SECRET_KEY_CLASS_NAME);
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}
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/**
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* Gets the {@link KeyStore} operation handle corresponding to the provided JCA crypto
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* primitive.
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*
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* <p>The following primitives are supported: {@link Cipher} and {@link Mac}.
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*
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* @return KeyStore operation handle or {@code null} if the provided primitive's KeyStore
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* operation is not in progress.
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*
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* @throws IllegalArgumentException if the provided primitive is not supported or is not backed
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* by AndroidKeyStore provider.
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*/
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public static Long getKeyStoreOperationHandle(Object cryptoPrimitive) {
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if (cryptoPrimitive == null) {
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throw new NullPointerException();
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}
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Object spi;
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if (cryptoPrimitive instanceof Mac) {
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spi = ((Mac) cryptoPrimitive).getSpi();
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} else if (cryptoPrimitive instanceof Cipher) {
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spi = ((Cipher) cryptoPrimitive).getSpi();
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} else {
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throw new IllegalArgumentException("Unsupported crypto primitive: " + cryptoPrimitive);
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}
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if (!(spi instanceof KeyStoreCryptoOperation)) {
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throw new IllegalArgumentException(
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"Crypto primitive not backed by AndroidKeyStore: " + cryptoPrimitive
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+ ", spi: " + spi);
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}
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return ((KeyStoreCryptoOperation) spi).getOperationHandle();
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}
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}
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