84 lines
3.0 KiB
Java
84 lines
3.0 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.spec;
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import java.math.BigInteger;
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import java.util.Objects;
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/**
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* A class representing elliptic curve public keys as defined in RFC 7748,
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* including the curve and other algorithm parameters. The public key is a
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* particular point on the curve, which is represented using only its
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* u-coordinate. A u-coordinate is an element of the field of integers modulo
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* some value that is determined by the algorithm parameters. This field
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* element is represented by a BigInteger which may hold any value. That is,
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* the BigInteger is not restricted to the range of canonical field elements.
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*
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* @since 11
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*/
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public class XECPublicKeySpec implements KeySpec {
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private final AlgorithmParameterSpec params;
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private final BigInteger u;
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/**
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* Construct a public key spec using the supplied parameters and
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* u coordinate.
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*
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* @param params the algorithm parameters
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* @param u the u-coordinate of the point, represented using a BigInteger
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* which may hold any value
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*
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* @throws NullPointerException if {@code params} or {@code u}
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* is null.
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*/
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public XECPublicKeySpec(AlgorithmParameterSpec params, BigInteger u) {
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Objects.requireNonNull(params, "params must not be null");
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Objects.requireNonNull(u, "u must not be null");
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this.params = params;
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this.u = u;
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}
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/**
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* Get the algorithm parameters that define the curve and other settings.
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*
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* @return the parameters
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*/
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public AlgorithmParameterSpec getParams() {
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return params;
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}
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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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public BigInteger getU() {
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return u;
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}
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}
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