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/*
* Copyright (C) 2012 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 org.bouncycastle.crypto.digests;
import org.bouncycastle.crypto.Digest;
/**
* Level of indirection to let us select OpenSSLDigest implementations
* for libcore but fallback to BouncyCastle ones on the RI.
*/
public final class AndroidDigestFactory {
private static final String OpenSSLFactoryClassName
= AndroidDigestFactory.class.getName() + "OpenSSL";
private static final String BouncyCastleFactoryClassName
= AndroidDigestFactory.class.getName() + "BouncyCastle";
private static final AndroidDigestFactoryInterface FACTORY;
static {
Class factoryImplementationClass;
try {
factoryImplementationClass = Class.forName(OpenSSLFactoryClassName);
// Double check for NativeCrypto in case we are running on RI for testing
Class.forName("com.android.org.conscrypt.NativeCrypto");
} catch (ClassNotFoundException e1) {
try {
factoryImplementationClass = Class.forName(BouncyCastleFactoryClassName);
} catch (ClassNotFoundException e2) {
AssertionError e = new AssertionError("Failed to load "
+ "AndroidDigestFactoryInterface "
+ "implementation. Looked for "
+ OpenSSLFactoryClassName + " and "
+ BouncyCastleFactoryClassName);
e.initCause(e1);
throw e;
}
}
if (!AndroidDigestFactoryInterface.class.isAssignableFrom(factoryImplementationClass)) {
throw new AssertionError(factoryImplementationClass
+ "does not implement AndroidDigestFactoryInterface");
}
try {
FACTORY = (AndroidDigestFactoryInterface) factoryImplementationClass.newInstance();
} catch (InstantiationException e) {
throw new AssertionError(e);
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}
public static Digest getMD5() {
return FACTORY.getMD5();
}
public static Digest getSHA1() {
return FACTORY.getSHA1();
}
public static Digest getSHA256() {
return FACTORY.getSHA256();
}
public static Digest getSHA384() {
return FACTORY.getSHA384();
}
public static Digest getSHA512() {
return FACTORY.getSHA512();
}
}
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