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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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java/pkg/java/security/SignedObject.java+258−0
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1+/*
2+ * Copyright (c) 1997, 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+
26+package java.security;
27+
28+import java.io.*;
29+
30+/**
31+ * <p> SignedObject is a class for the purpose of creating authentic
32+ * runtime objects whose integrity cannot be compromised without being
33+ * detected.
34+ *
35+ * <p> More specifically, a SignedObject contains another Serializable
36+ * object, the (to-be-)signed object and its signature.
37+ *
38+ * <p> The signed object is a "deep copy" (in serialized form) of an
39+ * original object. Once the copy is made, further manipulation of
40+ * the original object has no side effect on the copy.
41+ *
42+ * <p> The underlying signing algorithm is designated by the Signature
43+ * object passed to the constructor and the <code>verify</code> method.
44+ * A typical usage for signing is the following:
45+ *
46+ * <p> <code> <pre>
47+ * Signature signingEngine = Signature.getInstance(algorithm,
48+ * provider);
49+ * SignedObject so = new SignedObject(myobject, signingKey,
50+ * signingEngine);
51+ * </pre> </code>
52+ *
53+ * <p> A typical usage for verification is the following (having
54+ * received SignedObject <code>so</code>):
55+ *
56+ * <p> <code> <pre>
57+ * Signature verificationEngine =
58+ * Signature.getInstance(algorithm, provider);
59+ * if (so.verify(publickey, verificationEngine))
60+ * try {
61+ * Object myobj = so.getObject();
62+ * } catch (java.lang.ClassNotFoundException e) {};
63+ * </pre> </code>
64+ *
65+ * <p> Several points are worth noting. First, there is no need to
66+ * initialize the signing or verification engine, as it will be
67+ * re-initialized inside the constructor and the <code>verify</code>
68+ * method. Secondly, for verification to succeed, the specified
69+ * public key must be the public key corresponding to the private key
70+ * used to generate the SignedObject.
71+ *
72+ * <p> More importantly, for flexibility reasons, the
73+ * constructor and <code>verify</code> method allow for
74+ * customized signature engines, which can implement signature
75+ * algorithms that are not installed formally as part of a crypto
76+ * provider. However, it is crucial that the programmer writing the
77+ * verifier code be aware what <code>Signature</code> engine is being
78+ * used, as its own implementation of the <code>verify</code> method
79+ * is invoked to verify a signature. In other words, a malicious
80+ * <code>Signature</code> may choose to always return true on
81+ * verification in an attempt to bypass a security check.
82+ *
83+ * <p> The signature algorithm can be, among others, the NIST standard
84+ * DSA, using DSA and SHA-1. The algorithm is specified using the
85+ * same convention as that for signatures. The DSA algorithm using the
86+ * SHA-1 message digest algorithm can be specified, for example, as
87+ * "SHA/DSA" or "SHA-1/DSA" (they are equivalent). In the case of
88+ * RSA, there are multiple choices for the message digest algorithm,
89+ * so the signing algorithm could be specified as, for example,
90+ * "MD2/RSA", "MD5/RSA" or "SHA-1/RSA". The algorithm name must be
91+ * specified, as there is no default.
92+ *
93+ * <p> The name of the Cryptography Package Provider is designated
94+ * also by the Signature parameter to the constructor and the
95+ * <code>verify</code> method. If the provider is not
96+ * specified, the default provider is used. Each installation can
97+ * be configured to use a particular provider as default.
98+ *
99+ * <p> Potential applications of SignedObject include:
100+ * <ul>
101+ * <li> It can be used
102+ * internally to any Java runtime as an unforgeable authorization
103+ * token -- one that can be passed around without the fear that the
104+ * token can be maliciously modified without being detected.
105+ * <li> It
106+ * can be used to sign and serialize data/object for storage outside
107+ * the Java runtime (e.g., storing critical access control data on
108+ * disk).
109+ * <li> Nested SignedObjects can be used to construct a logical
110+ * sequence of signatures, resembling a chain of authorization and
111+ * delegation.
112+ * </ul>
113+ *
114+ * @see Signature
115+ *
116+ * @author Li Gong
117+ */
118+
119+public final class SignedObject implements Serializable {
120+
121+ private static final long serialVersionUID = 720502720485447167L;
122+
123+ /*
124+ * The original content is "deep copied" in its serialized format
125+ * and stored in a byte array. The signature field is also in the
126+ * form of byte array.
127+ */
128+
129+ private byte[] content;
130+ private byte[] signature;
131+ private String thealgorithm;
132+
133+ /**
134+ * Constructs a SignedObject from any Serializable object.
135+ * The given object is signed with the given signing key, using the
136+ * designated signature engine.
137+ *
138+ * @param object the object to be signed.
139+ * @param signingKey the private key for signing.
140+ * @param signingEngine the signature signing engine.
141+ *
142+ * @exception IOException if an error occurs during serialization
143+ * @exception InvalidKeyException if the key is invalid.
144+ * @exception SignatureException if signing fails.
145+ */
146+ public SignedObject(Serializable object, PrivateKey signingKey,
147+ Signature signingEngine)
148+ throws IOException, InvalidKeyException, SignatureException {
149+ // creating a stream pipe-line, from a to b
150+ ByteArrayOutputStream b = new ByteArrayOutputStream();
151+ ObjectOutput a = new ObjectOutputStream(b);
152+
153+ // write and flush the object content to byte array
154+ a.writeObject(object);
155+ a.flush();
156+ a.close();
157+ this.content = b.toByteArray();
158+ b.close();
159+
160+ // now sign the encapsulated object
161+ this.sign(signingKey, signingEngine);
162+ }
163+
164+ /**
165+ * Retrieves the encapsulated object.
166+ * The encapsulated object is de-serialized before it is returned.
167+ *
168+ * @return the encapsulated object.
169+ *
170+ * @exception IOException if an error occurs during de-serialization
171+ * @exception ClassNotFoundException if an error occurs during
172+ * de-serialization
173+ */
174+ public Object getObject()
175+ throws IOException, ClassNotFoundException
176+ {
177+ // creating a stream pipe-line, from b to a
178+ ByteArrayInputStream b = new ByteArrayInputStream(this.content);
179+ ObjectInput a = new ObjectInputStream(b);
180+ Object obj = a.readObject();
181+ b.close();
182+ a.close();
183+ return obj;
184+ }
185+
186+ /**
187+ * Retrieves the signature on the signed object, in the form of a
188+ * byte array.
189+ *
190+ * @return the signature. Returns a new array each time this
191+ * method is called.
192+ */
193+ public byte[] getSignature() {
194+ return this.signature.clone();
195+ }
196+
197+ /**
198+ * Retrieves the name of the signature algorithm.
199+ *
200+ * @return the signature algorithm name.
201+ */
202+ public String getAlgorithm() {
203+ return this.thealgorithm;
204+ }
205+
206+ /**
207+ * Verifies that the signature in this SignedObject is the valid
208+ * signature for the object stored inside, with the given
209+ * verification key, using the designated verification engine.
210+ *
211+ * @param verificationKey the public key for verification.
212+ * @param verificationEngine the signature verification engine.
213+ *
214+ * @exception SignatureException if signature verification failed.
215+ * @exception InvalidKeyException if the verification key is invalid.
216+ *
217+ * @return <tt>true</tt> if the signature
218+ * is valid, <tt>false</tt> otherwise
219+ */
220+ public boolean verify(PublicKey verificationKey,
221+ Signature verificationEngine)
222+ throws InvalidKeyException, SignatureException {
223+ verificationEngine.initVerify(verificationKey);
224+ verificationEngine.update(this.content.clone());
225+ return verificationEngine.verify(this.signature.clone());
226+ }
227+
228+ /*
229+ * Signs the encapsulated object with the given signing key, using the
230+ * designated signature engine.
231+ *
232+ * @param signingKey the private key for signing.
233+ * @param signingEngine the signature signing engine.
234+ *
235+ * @exception InvalidKeyException if the key is invalid.
236+ * @exception SignatureException if signing fails.
237+ */
238+ private void sign(PrivateKey signingKey, Signature signingEngine)
239+ throws InvalidKeyException, SignatureException {
240+ // initialize the signing engine
241+ signingEngine.initSign(signingKey);
242+ signingEngine.update(this.content.clone());
243+ this.signature = signingEngine.sign().clone();
244+ this.thealgorithm = signingEngine.getAlgorithm();
245+ }
246+
247+ /**
248+ * readObject is called to restore the state of the SignedObject from
249+ * a stream.
250+ */
251+ private void readObject(java.io.ObjectInputStream s)
252+ throws java.io.IOException, ClassNotFoundException {
253+ java.io.ObjectInputStream.GetField fields = s.readFields();
254+ content = ((byte[])fields.get("content", null)).clone();
255+ signature = ((byte[])fields.get("signature", null)).clone();
256+ thealgorithm = (String)fields.get("thealgorithm", null);
257+ }
258+}