io.jsonwebtoken.security.OctetPublicJwk Maven / Gradle / Ivy

/*
 * Copyright © 2023 jsonwebtoken.io
 *
 * 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 io.jsonwebtoken.security;

import java.security.PublicKey;
import java.security.interfaces.ECPublicKey;

/**
 * JWK representation of an Edwards Curve
 * {@link PublicKey} as defined by RFC 8037, Section 2:
 * Key Type "OKP".
 *
 * Unlike the {@link EcPublicJwk} interface, which only supports
 * Weierstrass-form {@link ECPublicKey}s,
 * {@code OctetPublicJwk} allows for multiple parameterized {@link PublicKey} types
 * because the JDK supports two different types of Edwards Curve public keys:
 * 
 *     java.security.interfaces.XECPublicKey, introduced in JDK 11, and
 *     java.security.interfaces.EdECPublicKey, introduced in JDK 15.
 * 
 * As such, {@code OctetPublicJwk} is parameterized to support both key types.
 *
 * Earlier JDK Versions
 *
 * Even though {@code XECPublicKey} and {@code EdECPublicKey} were introduced in JDK 11 and JDK 15 respectively,
 * JJWT supports Octet public JWKs in earlier versions when BouncyCastle is enabled in the application classpath.  When
 * using earlier JDK versions, the {@code OctetPublicJwk} instance will need be parameterized with the
 * generic {@code PublicKey} type since the latter key types would not be present.  For example:
 * OctetPublicJwk<PublicKey> octetPublicJwk = getKey();
 *
 * OKP-specific Properties
 *
 * Note that the various OKP-specific properties are not available as separate dedicated getter methods, as most Java
 * applications should rarely, if ever, need to access these individual key properties since they typically represent
 * internal key material and/or serialization details. If you need to access these key properties, it is usually
 * recommended to obtain the corresponding {@link PublicKey} instance returned by {@link #toKey()} and
 * query that instead.
 *
 * Even so, because these properties exist and are readable by nature of every JWK being a
 * {@link java.util.Map Map}, they are still accessible via the standard {@code Map} {@link #get(Object) get} method
 * using an appropriate JWK parameter id, for example:
 *  * jwk.get("x");
 * // ... etc ...
 *
 * @param  The type of Edwards-curve {@link PublicKey} represented by this JWK (e.g. XECPublicKey, EdECPublicKey, etc).
 * @since 0.12.0
 */
public interface OctetPublicJwk extends PublicJwk {
}