SAML1ArtifactType0001Builder.java

/*
 * Copyright [2006] [University Corporation for Advanced Internet Development, Inc.]
 *
 * 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.opensaml.saml1.binding.artifact;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import org.opensaml.common.binding.SAMLMessageContext;
import org.opensaml.saml1.core.Assertion;
import org.opensaml.saml1.core.NameIdentifier;
import org.opensaml.saml1.core.RequestAbstractType;
import org.opensaml.saml1.core.Response;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Builder of SAML 1, type 0x001, artifacts.
 */
public class SAML1ArtifactType0001Builder implements SAML1ArtifactBuilder<SAML1ArtifactType0001> {

    /** Class logger. */
    private final Logger log = LoggerFactory.getLogger(SAML1ArtifactType0001Builder.class);

    /** {@inheritDoc} */
    public SAML1ArtifactType0001 buildArtifact(byte[] artifact) {
        return SAML1ArtifactType0001.parseArtifact(artifact);
    }

    /** {@inheritDoc} */
    public SAML1ArtifactType0001 buildArtifact(
            SAMLMessageContext<RequestAbstractType, Response, NameIdentifier> requestContext, Assertion assertion) {
        try {
            MessageDigest sha1Digester = MessageDigest.getInstance("SHA-1");
            byte[] source = sha1Digester.digest(requestContext.getLocalEntityId().getBytes());

            SecureRandom handleGenerator = SecureRandom.getInstance("SHA1PRNG");
            byte[] assertionHandle = new byte[20];
            handleGenerator.nextBytes(assertionHandle);

            return new SAML1ArtifactType0001(source, assertionHandle);
        } catch (NoSuchAlgorithmException e) {
            log.error("JVM does not support required cryptography algorithms.", e);
            throw new InternalError("JVM does not support required cryptography algorithms: SHA-1 and/or SHA1PRNG.");
        }
    }
}