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OAuth 2.0 SDK with OpenID Connection extensions for developing
client and server applications.
/*
* 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.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import com.nimbusds.jose.util.Base64URL;
import com.nimbusds.oauth2.sdk.id.Subject;
import net.jcip.annotations.ThreadSafe;
/**
* SHA-256 based encoder of pairwise subject identifiers. Reversal is not
* supported.
*
* Algorithm:
*
*
* sub = SHA-256 ( sector_id || local_sub || salt )
*
*
* Related specifications:
*
*
* - OpenID Connect Core 1.0, section 8.1.
*
*/
@ThreadSafe
public class HashBasedPairwiseSubjectCodec extends PairwiseSubjectCodec {
/**
* The hashing algorithm.
*/
public static final String HASH_ALGORITHM = "SHA-256";
/**
* Creates a new hash-based codec for pairwise subject identifiers.
*
* @param salt The salt, must not be {@code null}.
*/
public HashBasedPairwiseSubjectCodec(final byte[] salt) {
super(salt);
if (salt == null) {
throw new IllegalArgumentException("The salt must not be null");
}
}
/**
* Creates a new hash-based codec for pairwise subject identifiers.
*
* @param salt The salt, must not be {@code null}.
*/
public HashBasedPairwiseSubjectCodec(final Base64URL salt) {
super(salt.decode());
}
@Override
public Subject encode(final SectorID sectorID, final Subject localSub) {
MessageDigest sha256;
try {
if (getProvider() != null) {
sha256 = MessageDigest.getInstance(HASH_ALGORITHM, getProvider());
} else {
sha256 = MessageDigest.getInstance(HASH_ALGORITHM);
}
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e.getMessage(), e);
}
sha256.update(sectorID.getValue().getBytes(CHARSET));
sha256.update(localSub.getValue().getBytes(CHARSET));
byte[] hash = sha256.digest(getSalt());
return new Subject(Base64URL.encode(hash).toString());
}
}