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/*
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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package sun.security.util;
import java.security.AccessController;
import java.security.AlgorithmConstraints;
import java.security.PrivilegedAction;
import java.security.Security;
import java.util.Set;
/**
* The class contains common functionality for algorithm constraints classes.
*/
public abstract class AbstractAlgorithmConstraints
implements AlgorithmConstraints {
protected final AlgorithmDecomposer decomposer;
protected AbstractAlgorithmConstraints(AlgorithmDecomposer decomposer) {
this.decomposer = decomposer;
}
// Get algorithm constraints from the specified security property.
static String[] getAlgorithms(String propertyName) {
String property = AccessController.doPrivileged(
new PrivilegedAction() {
@Override
public String run() {
return Security.getProperty(propertyName);
}
});
String[] algorithmsInProperty = null;
if (property != null && !property.isEmpty()) {
// remove double quote marks from beginning/end of the property
if (property.length() >= 2 && property.charAt(0) == '"' &&
property.charAt(property.length() - 1) == '"') {
property = property.substring(1, property.length() - 1);
}
algorithmsInProperty = property.split(",");
for (int i = 0; i < algorithmsInProperty.length; i++) {
algorithmsInProperty[i] = algorithmsInProperty[i].trim();
}
}
// map the disabled algorithms
if (algorithmsInProperty == null) {
algorithmsInProperty = new String[0];
}
return algorithmsInProperty;
}
static boolean checkAlgorithm(String[] algorithms, String algorithm,
AlgorithmDecomposer decomposer) {
if (algorithm == null || algorithm.length() == 0) {
throw new IllegalArgumentException("No algorithm name specified");
}
Set elements = null;
for (String item : algorithms) {
if (item == null || item.isEmpty()) {
continue;
}
// check the full name
if (item.equalsIgnoreCase(algorithm)) {
return false;
}
// decompose the algorithm into sub-elements
if (elements == null) {
elements = decomposer.decompose(algorithm);
}
// check the items of the algorithm
for (String element : elements) {
if (item.equalsIgnoreCase(element)) {
return false;
}
}
}
return true;
}
}