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/*
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* Copyright (c) 2003, 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 sun.security.rsa;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.security.*;
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import java.security.spec.AlgorithmParameterSpec;
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import java.security.interfaces.*;
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import sun.security.util.*;
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import sun.security.x509.AlgorithmId;
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import sun.security.pkcs.PKCS8Key;
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/**
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* RSA private key implementation for "RSA", "RSASSA-PSS" algorithms in non-CRT
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* form (modulus, private exponent only). For CRT private keys, see
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* RSAPrivateCrtKeyImpl. We need separate classes to ensure correct behavior
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* in instanceof checks, etc.
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*
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* Note: RSA keys must be at least 512 bits long
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*
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* @see RSAPrivateCrtKeyImpl
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* @see RSAKeyFactory
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*
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* @since 1.5
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* @author Andreas Sterbenz
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*/
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public final class RSAPrivateKeyImpl extends PKCS8Key implements RSAPrivateKey {
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private static final long serialVersionUID = -33106691987952810L;
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private final BigInteger n; // modulus
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private final BigInteger d; // private exponent
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// optional parameters associated with this RSA key
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// specified in the encoding of its AlgorithmId.
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// must be null for "RSA" keys.
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private final AlgorithmParameterSpec keyParams;
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/**
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* Construct a key from its components. Used by the
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* RSAKeyFactory and the RSAKeyPairGenerator.
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*/
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RSAPrivateKeyImpl(AlgorithmId rsaId, BigInteger n, BigInteger d)
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throws InvalidKeyException {
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RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), null);
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this.n = n;
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this.d = d;
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this.keyParams = RSAUtil.getParamSpec(rsaId);
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// generate the encoding
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algid = rsaId;
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try {
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DerOutputStream out = new DerOutputStream();
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out.putInteger(0); // version must be 0
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out.putInteger(n);
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out.putInteger(0);
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out.putInteger(d);
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out.putInteger(0);
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out.putInteger(0);
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out.putInteger(0);
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out.putInteger(0);
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out.putInteger(0);
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DerValue val =
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new DerValue(DerValue.tag_Sequence, out.toByteArray());
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key = val.toByteArray();
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} catch (IOException exc) {
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// should never occur
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throw new InvalidKeyException(exc);
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}
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}
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// see JCA doc
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@Override
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public String getAlgorithm() {
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return algid.getName();
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}
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// see JCA doc
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@Override
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public BigInteger getModulus() {
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return n;
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}
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// see JCA doc
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@Override
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public BigInteger getPrivateExponent() {
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return d;
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}
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// see JCA doc
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@Override
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public AlgorithmParameterSpec getParams() {
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return keyParams;
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}
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// return a string representation of this key for debugging
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@Override
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public String toString() {
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return "Sun " + getAlgorithm() + " private key, " + n.bitLength()
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+ " bits" + "\n params: " + keyParams + "\n modulus: " + n
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+ "\n private exponent: " + d;
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}
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}
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