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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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package sun.security.util;

import java.io.IOException;

import java.math.BigInteger;

import java.security.spec.*;

import java.util.Arrays;

/**

 * Contains Elliptic Curve parameters.

 *

 * @since   1.6

 * @author  Andreas Sterbenz

 */

public final class NamedCurve extends ECParameterSpec {

    // friendly names with stdName followed by aliases

    private final String[] nameAndAliases;

    // well known OID

    private final String oid;

    // encoded form (as NamedCurve identified via OID)

    private final byte[] encoded;

    NamedCurve(KnownOIDs ko, EllipticCurve curve,

            ECPoint g, BigInteger n, int h) {

        super(curve, g, n, h);

        String[] aliases = ko.aliases();

        this.nameAndAliases = new String[aliases.length + 1];

        nameAndAliases[0] = ko.stdName();

        System.arraycopy(aliases, 0, nameAndAliases, 1, aliases.length);

        this.oid = ko.value();

        DerOutputStream out = new DerOutputStream();

        try {

            out.putOID(ObjectIdentifier.of(ko));

        } catch (IOException e) {

            throw new RuntimeException("Internal error", e);

        }

        encoded = out.toByteArray();

    }

    // returns the curve's standard name followed by its aliases

    public String[] getNameAndAliases() {

        return nameAndAliases;

    }

    public byte[] getEncoded() {

        return encoded.clone();

    }

    public String getObjectId() {

        return oid;

    }

    public String toString() {

        StringBuilder sb = new StringBuilder(nameAndAliases[0]);

        if (nameAndAliases.length > 1) {

            sb.append(" [");

            int j = 1;

            while (j < nameAndAliases.length - 1) {

                sb.append(nameAndAliases[j++]);

                sb.append(',');

            }

            sb.append(nameAndAliases[j] + "]");

        }

        sb.append(" (" + oid + ")");

        return sb.toString();

    }

}