83 lines
3.1 KiB
Java
83 lines
3.1 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.util.Objects;
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/**
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* A class representing elliptic curve private keys as defined in RFC 7748,
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* including the curve and other algorithm parameters. The private key is
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* represented as an encoded scalar value. The decoding procedure defined in
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* the RFC includes an operation that forces certain bits of the key to either
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* 1 or 0. This operation is known as "pruning" or "clamping" the private key.
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* All arrays in this spec are unpruned, and implementations will need to prune
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* the array before using it in any numerical operations.
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*
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* @since 11
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*/
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public class XECPrivateKeySpec implements KeySpec {
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private final AlgorithmParameterSpec params;
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private final byte[] scalar;
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/**
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* Construct a private key spec using the supplied parameters and
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* encoded scalar value.
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*
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* @param params the algorithm parameters
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* @param scalar the unpruned encoded scalar value. This array is copied
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* to protect against subsequent modification.
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*
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* @throws NullPointerException if {@code params} or {@code scalar}
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* is null.
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*/
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public XECPrivateKeySpec(AlgorithmParameterSpec params, byte[] scalar) {
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Objects.requireNonNull(params, "params must not be null");
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Objects.requireNonNull(scalar, "scalar must not be null");
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this.params = params;
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this.scalar = scalar.clone();
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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 algorithm 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 scalar value encoded as an unpruned byte array. A new copy of
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* the array is returned each time this method is called.
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*
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* @return the unpruned encoded scalar value
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*/
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public byte[] getScalar() {
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return scalar.clone();
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}
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}
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