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OAuth 2.0 SDK with OpenID Connection extensions for developing client and server applications.
There is a newer version: 11.20.1
/*
 * oauth2-oidc-sdk
 *
 * Copyright 2012-2016, Connect2id Ltd and contributors.
 *
 * 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 com.nimbusds.openid.connect.sdk.id;


import java.net.URI;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.Provider;
import java.util.Map;

import net.jcip.annotations.ThreadSafe;

import com.nimbusds.oauth2.sdk.id.Subject;


/**
 * Encoder and decoder of pairwise subject identifiers. The encoder algorithms
 * must be deterministic, to ensure a given set of inputs always produces an
 * identical pairwise subject identifier.
 *
 * Decoding pairwise subject identifiers is optional, and is implemented by
 * algorithms that supported reversal (typically with encryption-based codecs).
 * Hash-based codecs don't support reversal.
 *
 * 
Codec implementations thread-safe.
 *
 * 
Related specifications:
 *
 * 

 *     OpenID Connect Core 1.0, section 8.1.
 * 
 */
@ThreadSafe
public abstract class PairwiseSubjectCodec {


	/**
	 * The charset (UTF-8) for string to byte conversions.
	 */
	public static final Charset CHARSET = StandardCharsets.UTF_8;


	/**
	 * The salt.
	 */
	private final byte[] salt;


	/**
	 * The security provider.
	 */
	private Provider provider;


	/**
	 * Creates a new codec for pairwise subject identifiers.
	 *
	 * @param salt The salt, {@code null} if not required.
	 */
	public PairwiseSubjectCodec(final byte[] salt) {

		this.salt = salt;
	}


	/**
	 * Returns the salt.
	 *
	 * @return The salt, {@code null} if not required.
	 */
	public byte[] getSalt() {
		return salt;
	}


	/**
	 * Gets the security provider for cryptographic operations.
	 *
	 * @return The security provider, {@code null} if not specified
	 *         (implies the default one).
	 */
	public Provider getProvider() {
		return provider;
	}


	/**
	 * Sets the security provider for cryptographic operations.
	 *
	 * @param provider The security provider, {@code null} if not specified
	 *                 (implies the default one).
	 */
	public void setProvider(final Provider provider) {
		this.provider = provider;
	}


	/**
	 * Encodes a new pairwise subject identifier from the specified sector
	 * identifier URI and local subject.
	 *
	 * @param sectorURI The sector identifier URI. Its scheme should be
	 *                  "https", must include a host portion and must not
	 *                  be {@code null}.
	 * @param localSub  The local subject identifier. Must not be
	 *                  {@code null}.
	 *
	 * @return The pairwise subject identifier.
	 */
	public Subject encode(final URI sectorURI, final Subject localSub) {

		return encode(new SectorID(sectorURI), localSub);
	}


	/**
	 * Encodes a new pairwise subject identifier from the specified sector
	 * identifier and local subject.
	 *
	 * @param sectorID The sector identifier. Must not be {@code null}.
	 * @param localSub The local subject identifier. Must not be
	 *                 {@code null}.
	 *
	 * @return The pairwise subject identifier.
	 */
	public abstract Subject encode(final SectorID sectorID, final Subject localSub);


	/**
	 * Decodes the specified pairwise subject identifier to produce the
	 * matching sector identifier and local subject. Throws a
	 * {@link UnsupportedOperationException}. Codecs that support pairwise
	 * subject identifier reversal should override this method.
	 *
	 * @param pairwiseSubject The pairwise subject identifier. Must be
	 *                        valid and not {@code null}.
	 *
	 * @return The matching sector identifier and local subject.
	 *
	 * @throws InvalidPairwiseSubjectException If the pairwise subject is
	 *                                         invalid.
	 */
	public Map.Entry decode(final Subject pairwiseSubject)
		throws InvalidPairwiseSubjectException {

		throw new UnsupportedOperationException("Pairwise subject decoding is not supported");
	}
}