org.simplejavamail.internal.smimesupport.CMSAlgorithmResolver Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of smime-module Show documentation

Simple API, Complex Emails. Now with S/MIME support

There is a newer version: 8.12.4

/*
 * Copyright © 2009 Benny Bottema ([email protected])
 *
 * 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.simplejavamail.internal.smimesupport;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.cms.CMSAlgorithm;
import org.jetbrains.annotations.Nullable;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

/**
 * This class is used to resolve the algorithm name to the corresponding ASN1ObjectIdentifier.
 * This is used to support the algorithm names in the S/MIME configuration, and is needed because
 * the Bouncy Castle CMSAlgorithm class does not provide a method to resolve the algorithm name to
 * (and it's not an enum, either)
 */
class CMSAlgorithmResolver {

    private static final Map algorithmMap = new HashMap<>();

    static {
        Field[] fields = CMSAlgorithm.class.getDeclaredFields();
        for (Field field : fields) {
            if (field.getType().equals(ASN1ObjectIdentifier.class)) {
                try {
                    algorithmMap.put(field.getName(), (ASN1ObjectIdentifier) field.get(null));
                } catch (IllegalAccessException e) {
                    throw new RuntimeException("Failed to access CMSAlgorithm field: " + field.getName(), e);
                }
            }
        }
    }

    @Nullable
    static ASN1ObjectIdentifier resolve(String algorithmName) {
        return algorithmMap.get(algorithmName);
    }
}