57 lines
2.2 KiB
Java
57 lines
2.2 KiB
Java
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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.security.interfaces;
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import java.math.BigInteger;
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import java.security.PublicKey;
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/**
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* An interface for an elliptic curve public key as defined by RFC 7748.
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* These keys are distinct from the keys represented by {@code ECPublicKey},
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* and they are intended for use with algorithms based on RFC 7748 such as the
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* XDH {@code KeyAgreement} algorithm.
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*
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* An XEC public key is a particular point on the curve, which is represented
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* using only its u-coordinate as described in RFC 7748. A u-coordinate is an
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* element of the field of integers modulo some value that is determined by
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* the algorithm parameters. This field element is represented by a BigInteger
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* which may hold any value. That is, the BigInteger is not restricted to the
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* range of canonical field elements.
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*
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* @since 11
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*/
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public interface XECPublicKey extends XECKey, PublicKey {
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/**
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* Get the u coordinate of the point.
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*
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* @return the u-coordinate, represented using a BigInteger which may hold
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* any value
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*/
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BigInteger getU();
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}
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