1/*
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.security.rsa;
27
28import java.io.IOException;
29import java.math.BigInteger;
30
31import java.security.*;
32import java.security.interfaces.*;
33
34import sun.security.util.*;
35import sun.security.pkcs.PKCS8Key;
36
37/**
38 * Key implementation for RSA private keys, non-CRT form (modulus, private
39 * exponent only). For CRT private keys, see RSAPrivateCrtKeyImpl. We need
40 * separate classes to ensure correct behavior in instanceof checks, etc.
41 *
42 * Note: RSA keys must be at least 512 bits long
43 *
44 * @see RSAPrivateCrtKeyImpl
45 * @see RSAKeyFactory
46 *
47 * @since   1.5
48 * @author  Andreas Sterbenz
49 */
50public final class RSAPrivateKeyImpl extends PKCS8Key implements RSAPrivateKey {
51
52    private static final long serialVersionUID = -33106691987952810L;
53
54    private final BigInteger n;         // modulus
55    private final BigInteger d;         // private exponent
56
57    /**
58     * Construct a key from its components. Used by the
59     * RSAKeyFactory and the RSAKeyPairGenerator.
60     */
61    RSAPrivateKeyImpl(BigInteger n, BigInteger d) throws InvalidKeyException {
62        this.n = n;
63        this.d = d;
64        RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), null);
65        // generate the encoding
66        algid = RSAPrivateCrtKeyImpl.rsaId;
67        try {
68            DerOutputStream out = new DerOutputStream();
69            out.putInteger(0); // version must be 0
70            out.putInteger(n);
71            out.putInteger(0);
72            out.putInteger(d);
73            out.putInteger(0);
74            out.putInteger(0);
75            out.putInteger(0);
76            out.putInteger(0);
77            out.putInteger(0);
78            DerValue val =
79                new DerValue(DerValue.tag_Sequence, out.toByteArray());
80            key = val.toByteArray();
81        } catch (IOException exc) {
82            // should never occur
83            throw new InvalidKeyException(exc);
84        }
85    }
86
87    // see JCA doc
88    public String getAlgorithm() {
89        return "RSA";
90    }
91
92    // see JCA doc
93    public BigInteger getModulus() {
94        return n;
95    }
96
97    // see JCA doc
98    public BigInteger getPrivateExponent() {
99        return d;
100    }
101}
102