/* * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved. * 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, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.security.rsa; import java.io.IOException;import java.math.BigInteger; import java.security.*;import java.security.interfaces.*; import sun.security.util.*;import sun.security.pkcs.PKCS8Key; /** * Key implementation for RSA private keys, non-CRT form (modulus, private * exponent only). For CRT private keys, see RSAPrivateCrtKeyImpl. We need * separate classes to ensure correct behavior in instanceof checks, etc. * * Note: RSA keys must be at least 512 bits long * * @see RSAPrivateCrtKeyImpl * @see RSAKeyFactory * * @since   1.5 * @author  Andreas Sterbenz */public final class RSAPrivateKeyImpl extends PKCS8Key implements RSAPrivateKey {     private static final long serialVersionUID = -33106691987952810L;     private final BigInteger n;         // modulus    private final BigInteger d;         // private exponent     /**     * Construct a key from its components. Used by the     * RSAKeyFactory and the RSAKeyPairGenerator.     */    RSAPrivateKeyImpl(BigInteger n, BigInteger d) throws InvalidKeyException {        this.n = n;        this.d = d;        RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), null);        // generate the encoding        algid = RSAPrivateCrtKeyImpl.rsaId;        try {            DerOutputStream out = new DerOutputStream();            out.putInteger(0); // version must be 0            out.putInteger(n);            out.putInteger(0);            out.putInteger(d);            out.putInteger(0);            out.putInteger(0);            out.putInteger(0);            out.putInteger(0);            out.putInteger(0);            DerValue val =                new DerValue(DerValue.tag_Sequence, out.toByteArray());            key = val.toByteArray();        } catch (IOException exc) {            // should never occur            throw new InvalidKeyException(exc);        }    }     // see JCA doc    public String getAlgorithm() {        return "RSA";    }     // see JCA doc    public BigInteger getModulus() {        return n;    }     // see JCA doc    public BigInteger getPrivateExponent() {        return d;    }     // return a string representation of this key for debugging    public String toString() {        return "Sun RSA private key, " + n.bitLength() + " bits\n  modulus: "                + n + "\n  private exponent: " + d;    } }