1/*
2 * Copyright (c) 2003, 2011, 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 com.sun.crypto.provider;
27
28import java.security.*;
29import java.security.spec.*;
30
31import javax.crypto.*;
32import javax.crypto.spec.RC2ParameterSpec;
33
34/**
35 * JCE CipherSpi for the RC2(tm) algorithm as described in RFC 2268.
36 * The real code is in CipherCore and RC2Crypt.
37 *
38 * @since   1.5
39 * @author  Andreas Sterbenz
40 */
41public final class RC2Cipher extends CipherSpi {
42
43    // internal CipherCore & RC2Crypt objects which do the real work.
44    private final CipherCore core;
45    private final RC2Crypt embeddedCipher;
46
47    public RC2Cipher() {
48        embeddedCipher = new RC2Crypt();
49        core = new CipherCore(embeddedCipher, 8);
50    }
51
52    protected void engineSetMode(String mode)
53            throws NoSuchAlgorithmException {
54        core.setMode(mode);
55    }
56
57    protected void engineSetPadding(String paddingScheme)
58            throws NoSuchPaddingException {
59        core.setPadding(paddingScheme);
60    }
61
62    protected int engineGetBlockSize() {
63        return 8;
64    }
65
66    protected int engineGetOutputSize(int inputLen) {
67        return core.getOutputSize(inputLen);
68    }
69
70    protected byte[] engineGetIV() {
71        return core.getIV();
72    }
73
74    protected AlgorithmParameters engineGetParameters() {
75        return core.getParameters("RC2");
76    }
77
78    protected void engineInit(int opmode, Key key, SecureRandom random)
79            throws InvalidKeyException {
80        embeddedCipher.initEffectiveKeyBits(0);
81        core.init(opmode, key, random);
82    }
83
84    protected void engineInit(int opmode, Key key,
85            AlgorithmParameterSpec params, SecureRandom random)
86            throws InvalidKeyException, InvalidAlgorithmParameterException {
87        if (params != null && params instanceof RC2ParameterSpec) {
88            embeddedCipher.initEffectiveKeyBits
89                (((RC2ParameterSpec)params).getEffectiveKeyBits());
90        } else {
91            embeddedCipher.initEffectiveKeyBits(0);
92        }
93        core.init(opmode, key, params, random);
94    }
95
96    protected void engineInit(int opmode, Key key,
97            AlgorithmParameters params, SecureRandom random)
98            throws InvalidKeyException, InvalidAlgorithmParameterException {
99        if (params != null && params.getAlgorithm().equals("RC2")) {
100            try {
101                RC2ParameterSpec rc2Params =
102                        params.getParameterSpec(RC2ParameterSpec.class);
103                engineInit(opmode, key, rc2Params, random);
104            } catch (InvalidParameterSpecException ipse) {
105                throw new InvalidAlgorithmParameterException
106                            ("Wrong parameter type: RC2 expected");
107            }
108        } else {
109            embeddedCipher.initEffectiveKeyBits(0);
110            core.init(opmode, key, params, random);
111        }
112    }
113
114    protected byte[] engineUpdate(byte[] in, int inOfs, int inLen) {
115        return core.update(in, inOfs, inLen);
116    }
117
118    protected int engineUpdate(byte[] in, int inOfs, int inLen,
119            byte[] out, int outOfs) throws ShortBufferException {
120        return core.update(in, inOfs, inLen, out, outOfs);
121    }
122
123    protected byte[] engineDoFinal(byte[] in, int inOfs, int inLen)
124            throws IllegalBlockSizeException, BadPaddingException {
125        return core.doFinal(in, inOfs, inLen);
126    }
127
128    protected int engineDoFinal(byte[] in, int inOfs, int inLen,
129            byte[] out, int outOfs) throws IllegalBlockSizeException,
130            ShortBufferException, BadPaddingException {
131        return core.doFinal(in, inOfs, inLen, out, outOfs);
132    }
133
134    protected int engineGetKeySize(Key key) throws InvalidKeyException {
135        byte[] keyBytes = CipherCore.getKeyBytes(key);
136        RC2Crypt.checkKey(key.getAlgorithm(), keyBytes.length);
137        return keyBytes.length << 3;
138    }
139
140    protected byte[] engineWrap(Key key)
141            throws IllegalBlockSizeException, InvalidKeyException {
142        return core.wrap(key);
143    }
144
145    protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm,
146            int wrappedKeyType) throws InvalidKeyException,
147            NoSuchAlgorithmException {
148        return core.unwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType);
149    }
150
151}
152