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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.xml.security.stax.securityToken;

import java.security.Key;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import java.util.List;
import java.util.Map;

import org.apache.xml.security.exceptions.XMLSecurityException;

/**
 * External view to a SecurityToken
 */
public interface SecurityToken {
    /**
     * Returns the token id aka wsu:Id
     *
     * @return The id
     */
    String getId();

    /**
     * Returns the token type
     *
     * @return true if asymmetric token, false if symmetric token
     */
    boolean isAsymmetric() throws XMLSecurityException;

    /**
     * Returns the secret key's if already initialized, null otherwise
     * @return Algorithm-URI key map
     * @throws XMLSecurityException
     */
    Map getSecretKey() throws XMLSecurityException;

    /**
     * Returns the public key if one exists and already initialized, null otherwise
     * @return the public key
     * @throws org.apache.xml.security.exceptions.XMLSecurityException
     */
    PublicKey getPublicKey() throws XMLSecurityException;

    /**
     * Returns the certificate chain if one exists for this token type
     *
     * @return The certificate chain
     * @throws org.apache.xml.security.exceptions.XMLSecurityException if the certificates can't be retrieved
     */
    X509Certificate[] getX509Certificates() throws XMLSecurityException;

    /**
     * Returns the key wrapping token
     *
     * @return The wrapping SecurityToken
     */
    SecurityToken getKeyWrappingToken() throws XMLSecurityException;

    List getWrappedTokens() throws XMLSecurityException;
    
    /**
     * Returns the KeyIdentifier
     *
     * @return the KeyIdentifier
     */
    SecurityTokenConstants.KeyIdentifier getKeyIdentifier();

    SecurityTokenConstants.TokenType getTokenType();

    List getTokenUsages();
    
    void addTokenUsage(SecurityTokenConstants.TokenUsage tokenUsage) throws XMLSecurityException;

    /**
     * Returns a SHA-1 Identifier that refers to this token
     * @return a SHA-1 Identifier that refers to this token
     */
    String getSha1Identifier();
}