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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/security/SignedObject.java
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+/* SignedObject.java --- Signed Object Class
+ Copyright (C) 1999, 2003, Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package java.security;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+
+/**
+ * <code>SignedObject</code> is used for storing runtime objects whose
+ * integrity cannot be compromised without being detected.
+ *
+ * <p><code>SignedObject</code> contains a {@link Serializable} object which is
+ * yet to be signed and a digital signature of that object.</p>
+ *
+ * <p>The signed copy is a "deep copy" (in serialized form) of an original
+ * object. Any changes to that original instance are not reflected in the
+ * enclosed copy inside this <code>SignedObject</code>.</p>
+ *
+ * <p>Several things to note are that, first there is no need to initialize the
+ * signature engine as this class will handle that automatically. Second,
+ * verification will only succeed if the public key corresponds to the private
+ * key used to generate the digital signature inside this
+ * <code>SignedObject</code>.</p>
+ *
+ * <p>For fexibility, the signature engine can be specified in the constructor
+ * or the <code>verify()</code> method. Programmers wishing to verify
+ * <code>SignedObject</code>s should be aware of the {@link Signature} engine
+ * they use. A malicious or flawed {@link Signature} implementation may always
+ * return true on verification thus circumventing the intended secrity check
+ * provided by the <code>SignedObject</code>.</p>
+ *
+ * <p>The GNU security provider offers an implementation of the standard NIST
+ * DSA which uses "DSA" and "SHA-1". It can be specified by "SHA/DSA",
+ * "SHA-1/DSA" or its OID. If the RSA signature algorithm is provided then it
+ * could be "MD2/RSA". "MD5/RSA", or "SHA-1/RSA". The algorithm must be
+ * specified because there is no default.</p>
+ *
+ * @author Mark Benvenuto (ivymccough@worldnet.att.net)
+ * @since 1.2
+ * @see Signature
+ */
+public final class SignedObject implements Serializable
+{
+ private static final long serialVersionUID = 720502720485447167L;
+
+ /** @serial */
+ private byte[] content;
+ /** @serial */
+ private byte[] signature;
+ /** @serial */
+ private String thealgorithm;
+
+ /**
+ * Constructs a new instance of <code>SignedObject</code> from a
+ * {@link Serializable} object. The object is signed with a designated
+ * private key and a signature engine.
+ *
+ * @param object
+ * the object to sign.
+ * @param signingKey
+ * the key to use.
+ * @param signingEngine
+ * the signature engine to use.
+ * @throws IOException
+ * if a serialization error occurred.
+ * @throws InvalidKeyException
+ * if the key is invalid.
+ * @throws SignatureException
+ * if a signing error occurs.
+ */
+ public SignedObject(Serializable object, PrivateKey signingKey,
+ Signature signingEngine)
+ throws IOException, InvalidKeyException, SignatureException
+ {
+ thealgorithm = signingEngine.getAlgorithm();
+
+ ByteArrayOutputStream ostream = new ByteArrayOutputStream();
+ ObjectOutputStream p = new ObjectOutputStream(ostream);
+ p.writeObject(object);
+ p.flush();
+ p.close();
+
+ content = ostream.toByteArray();
+
+ signingEngine.initSign(signingKey);
+ signingEngine.update(content);
+ signature = signingEngine.sign();
+ }
+
+ /**
+ * Returns the encapsulated object. The object is de-serialized before being
+ * returned.
+ *
+ * @return the encapsulated object.
+ * @throws IOException
+ * if a de-serialization error occurs.
+ * @throws ClassNotFoundException
+ * if the encapsulated object's class was not found.
+ */
+ public Object getObject() throws IOException, ClassNotFoundException
+ {
+ ByteArrayInputStream bais = new ByteArrayInputStream(content);
+ ObjectInput oi = new ObjectInputStream(bais);
+ Object obj = oi.readObject();
+ oi.close();
+ bais.close();
+
+ return obj;
+ }
+
+ /**
+ * Returns the signature bytes of the encapsulated object.
+ *
+ * @return the signature bytes of the encapsulated object.
+ */
+ public byte[] getSignature()
+ {
+ return (byte[]) signature.clone();
+
+ }
+
+ /**
+ * Returns the name of the signature algorithm.
+ *
+ * @return the name of the signature algorithm.
+ */
+ public String getAlgorithm()
+ {
+ return thealgorithm;
+ }
+
+ /**
+ * Verifies the encapsulated digital signature by checking that it was
+ * generated by the owner of a designated public key.
+ *
+ * @param verificationKey
+ * the public key to use.
+ * @param verificationEngine
+ * the signature engine to use.
+ * @return <code>true</code> if signature is correct, <code>false</code>
+ * otherwise.
+ * @throws InvalidKeyException
+ * if the key is invalid.
+ * @throws SignatureException
+ * if verification fails.
+ */
+ public boolean verify(PublicKey verificationKey, Signature verificationEngine)
+ throws InvalidKeyException, SignatureException
+ {
+ verificationEngine.initVerify(verificationKey);
+ verificationEngine.update(content);
+ return verificationEngine.verify(signature);
+ }
+
+ /** Called to restore the state of the SignedObject from a stream. */
+ private void readObject(ObjectInputStream s)
+ throws IOException, ClassNotFoundException
+ {
+ s.defaultReadObject();
+ content = (byte[]) content.clone();
+ signature = (byte[]) signature.clone();
+ }
+}