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/*
* Copyright (C) 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 libcore.javax.crypto;
import junit.framework.TestCase;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.Security;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.AEADBadTagException;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
public final class CipherOutputStreamTest extends TestCase {
// From b/36636576. CipherOutputStream had a bug where it would ignore exceptions
// thrown during close().
public void testDecryptCorruptGCM() throws Exception {
for (Provider provider : Security.getProviders()) {
Cipher cipher;
try {
cipher = Cipher.getInstance("AES/GCM/NoPadding", provider);
} catch (NoSuchAlgorithmException e) {
continue;
}
SecretKey key;
if (provider.getName().equals("AndroidKeyStoreBCWorkaround")) {
key = getAndroidKeyStoreSecretKey();
} else {
KeyGenerator keygen = KeyGenerator.getInstance("AES");
keygen.init(256);
key = keygen.generateKey();
}
GCMParameterSpec params = new GCMParameterSpec(128, new byte[12]);
byte[] unencrypted = new byte[200];
// Normal providers require specifying the IV, but KeyStore prohibits it, so
// we have to special-case it
if (provider.getName().equals("AndroidKeyStoreBCWorkaround")) {
cipher.init(Cipher.ENCRYPT_MODE, key);
} else {
cipher.init(Cipher.ENCRYPT_MODE, key, params);
}
byte[] encrypted = cipher.doFinal(unencrypted);
// Corrupt the final byte, which will corrupt the authentication tag
encrypted[encrypted.length - 1] ^= 1;
cipher.init(Cipher.DECRYPT_MODE, key, params);
CipherOutputStream cos = new CipherOutputStream(new ByteArrayOutputStream(), cipher);
try {
cos.write(encrypted);
cos.close();
fail("Writing a corrupted stream should throw an exception."
+ " Provider: " + provider);
} catch (IOException expected) {
assertTrue(expected.getCause() instanceof AEADBadTagException);
}
}
}
// The AndroidKeyStoreBCWorkaround provider can't use keys created by anything
// but Android KeyStore, which requires using its own parameters class to create
// keys. Since we're in javax, we can't link against the frameworks classes, so
// we have to use reflection to make a suitable key. This will always be safe
// because if we're making a key for AndroidKeyStoreBCWorkaround, the KeyStore
// classes must be present.
private static SecretKey getAndroidKeyStoreSecretKey() throws Exception {
KeyGenerator keygen = KeyGenerator.getInstance("AES", "AndroidKeyStore");
Class<?> keyParamsBuilderClass = keygen.getClass().getClassLoader().loadClass(
"android.security.keystore.KeyGenParameterSpec$Builder");
Object keyParamsBuilder = keyParamsBuilderClass.getConstructor(String.class, Integer.TYPE)
// 3 is PURPOSE_ENCRYPT | PURPOSE_DECRYPT
.newInstance("testDecryptCorruptGCM", 3);
keyParamsBuilderClass.getMethod("setBlockModes", new Class[]{String[].class})
.invoke(keyParamsBuilder, new Object[]{new String[]{"GCM"}});
keyParamsBuilderClass.getMethod("setEncryptionPaddings", new Class[]{String[].class})
.invoke(keyParamsBuilder, new Object[]{new String[]{"NoPadding"}});
AlgorithmParameterSpec spec = (AlgorithmParameterSpec)
keyParamsBuilderClass.getMethod("build", new Class[]{}).invoke(keyParamsBuilder);
keygen.init(spec);
return keygen.generateKey();
}
}
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