mirror of git://gcc.gnu.org/git/gcc.git
319 lines
11 KiB
Java
319 lines
11 KiB
Java
/* IncomingMessage.java --
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Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.crypto.key;
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import gnu.java.security.Registry;
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import gnu.java.security.key.IKeyPairCodec;
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import gnu.java.security.key.dss.DSSKeyPairPKCS8Codec;
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import gnu.java.security.key.dss.DSSKeyPairRawCodec;
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import gnu.java.security.key.dss.DSSKeyPairX509Codec;
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import gnu.java.security.key.rsa.RSAKeyPairPKCS8Codec;
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import gnu.java.security.key.rsa.RSAKeyPairRawCodec;
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import gnu.java.security.key.rsa.RSAKeyPairX509Codec;
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import gnu.javax.crypto.key.dh.DHKeyPairPKCS8Codec;
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import gnu.javax.crypto.key.dh.DHKeyPairRawCodec;
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import gnu.javax.crypto.key.dh.DHKeyPairX509Codec;
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import gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec;
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import java.io.ByteArrayInputStream;
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import java.io.UnsupportedEncodingException;
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import java.math.BigInteger;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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/**
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* An implementation of an incoming message for use with key agreement
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* protocols.
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*/
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public class IncomingMessage
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{
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/** The internal buffer stream containing the message's contents. */
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protected ByteArrayInputStream in;
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/** The length of the message contents, according to its 4-byte header. */
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protected int length;
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/**
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* Constructs an incoming message given the message's encoded form, including
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* its header bytes.
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*
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* @param b the encoded form, including the header bytes, of an incoming
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* message.
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* @throws KeyAgreementException if the buffer is malformed.
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*/
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public IncomingMessage(byte[] b) throws KeyAgreementException
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{
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this();
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if (b.length < 4)
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throw new KeyAgreementException("message header too short");
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length = b[0] << 24
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| (b[1] & 0xFF) << 16
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| (b[2] & 0xFF) << 8
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| (b[3] & 0xFF);
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if (length > Registry.SASL_BUFFER_MAX_LIMIT || length < 0)
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throw new KeyAgreementException("message size limit exceeded");
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in = new ByteArrayInputStream(b, 4, length);
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}
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/** Trivial private constructor for use by the class method. */
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private IncomingMessage()
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{
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super();
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}
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/**
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* Returns an instance of a message given its encoded contents, excluding the
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* message's header bytes.
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* <p>
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* Calls the method with the same name and three arguments as:
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* <code>getInstance(raw, 0, raw.length)</code>.
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*
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* @param raw the encoded form, excluding the header bytes.
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* @return a new instance of <code>IncomingMessage</code>.
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*/
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public static IncomingMessage getInstance(byte[] raw)
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{
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return getInstance(raw, 0, raw.length);
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}
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/**
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* Returns an instance of a message given its encoded contents, excluding the
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* message's header bytes.
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*
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* @param raw the encoded form, excluding the header bytes.
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* @param offset offset where to start using raw bytes from.
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* @param len number of bytes to use.
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* @return a new instance of <code>IncomingMessage</code>.
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*/
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public static IncomingMessage getInstance(byte[] raw, int offset, int len)
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{
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IncomingMessage result = new IncomingMessage();
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result.in = new ByteArrayInputStream(raw, offset, len);
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return result;
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}
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/**
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* Converts two octets into the number that they represent.
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*
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* @param b the two octets.
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* @return the length.
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*/
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public static int twoBytesToLength(byte[] b) throws KeyAgreementException
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{
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int result = (b[0] & 0xFF) << 8 | (b[1] & 0xFF);
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if (result > Registry.SASL_TWO_BYTE_MAX_LIMIT)
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throw new KeyAgreementException("encoded MPI size limit exceeded");
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return result;
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}
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/**
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* Converts four octets into the number that they represent.
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*
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* @param b the four octets.
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* @return the length.
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*/
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public static int fourBytesToLength(byte[] b) throws KeyAgreementException
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{
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int result = b[0] << 24
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| (b[1] & 0xFF) << 16
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| (b[2] & 0xFF) << 8
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| (b[3] & 0xFF);
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if (result > Registry.SASL_FOUR_BYTE_MAX_LIMIT || result < 0)
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throw new KeyAgreementException("encoded entity size limit exceeded");
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return result;
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}
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public boolean hasMoreElements()
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{
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return (in.available() > 0);
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}
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/**
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* Decodes a public key from the message.
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* <p>
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* See {@link OutgoingMessage#writePublicKey(java.security.PublicKey)} for
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* more details on the internal format.
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*
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* @throws KeyAgreementException if an encoding size constraint is violated or
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* a mismatch was detected in the encoding.
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*/
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public PublicKey readPublicKey() throws KeyAgreementException
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{
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if (in.available() < 5)
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throw new KeyAgreementException("not enough bytes for a public key in message");
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byte[] elementLengthBytes = new byte[4];
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in.read(elementLengthBytes, 0, 4);
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int elementLength = fourBytesToLength(elementLengthBytes);
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if (in.available() < elementLength)
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throw new KeyAgreementException("illegal public key encoding");
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int keyTypeAndFormatID = in.read() & 0xFF;
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elementLength--;
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byte[] kb = new byte[elementLength];
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in.read(kb, 0, elementLength);
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// instantiate the right codec and decode
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IKeyPairCodec kpc = getKeyPairCodec(keyTypeAndFormatID);
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return kpc.decodePublicKey(kb);
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}
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/**
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* Decodes a private key from the message.
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* <p>
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* See {@link OutgoingMessage#writePrivateKey(java.security.PrivateKey)} for
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* more details.
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*
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* @throws KeyAgreementException if an encoding size constraint is violated or
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* a mismatch was detected in the encoding.
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*/
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public PrivateKey readPrivateKey() throws KeyAgreementException
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{
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if (in.available() < 5)
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throw new KeyAgreementException("not enough bytes for a private key in message");
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byte[] elementLengthBytes = new byte[4];
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in.read(elementLengthBytes, 0, 4);
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int elementLength = fourBytesToLength(elementLengthBytes);
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if (in.available() < elementLength)
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throw new KeyAgreementException("illegal private key encoding");
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int keyTypeAndFormatID = in.read() & 0xFF;
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elementLength--;
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byte[] kb = new byte[elementLength];
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in.read(kb, 0, elementLength);
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// instantiate the right codec and decode
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IKeyPairCodec kpc = getKeyPairCodec(keyTypeAndFormatID);
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return kpc.decodePrivateKey(kb);
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}
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/**
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* Decodes an MPI from the current message's contents.
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*
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* @return a native representation of an MPI.
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* @throws KeyAgreementException if an encoding exception occurs during the
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* operation.
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*/
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public BigInteger readMPI() throws KeyAgreementException
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{
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if (in.available() < 2)
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throw new KeyAgreementException("not enough bytes for an MPI in message");
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byte[] elementLengthBytes = new byte[2];
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in.read(elementLengthBytes, 0, 2);
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int elementLength = twoBytesToLength(elementLengthBytes);
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if (in.available() < elementLength)
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throw new KeyAgreementException("illegal MPI encoding");
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byte[] element = new byte[elementLength];
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in.read(element, 0, element.length);
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return new BigInteger(1, element);
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}
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public String readString() throws KeyAgreementException
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{
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if (in.available() < 2)
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throw new KeyAgreementException("not enough bytes for a text in message");
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byte[] elementLengthBytes = new byte[2];
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in.read(elementLengthBytes, 0, 2);
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int elementLength = twoBytesToLength(elementLengthBytes);
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if (in.available() < elementLength)
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throw new KeyAgreementException("illegal text encoding");
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byte[] element = new byte[elementLength];
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in.read(element, 0, element.length);
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String result = null;
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try
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{
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result = new String(element, "UTF8");
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}
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catch (UnsupportedEncodingException x)
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{
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throw new KeyAgreementException("unxupported UTF8 encoding", x);
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}
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return result;
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}
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private IKeyPairCodec getKeyPairCodec(int keyTypeAndFormatID)
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throws KeyAgreementException
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{
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int keyType = (keyTypeAndFormatID >>> 4) & 0x0F;
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int formatID = keyTypeAndFormatID & 0x0F;
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switch (formatID)
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{
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case Registry.RAW_ENCODING_ID:
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switch (keyType)
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{
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case 0:
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return new DSSKeyPairRawCodec();
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case 1:
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return new RSAKeyPairRawCodec();
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case 2:
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return new DHKeyPairRawCodec();
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case 3:
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return new SRPKeyPairRawCodec();
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default:
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throw new KeyAgreementException("Unknown key-type for Raw format: "
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+ keyType);
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}
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case Registry.X509_ENCODING_ID:
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switch (keyType)
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{
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case 0:
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return new DSSKeyPairX509Codec();
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case 1:
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return new RSAKeyPairX509Codec();
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case 2:
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return new DHKeyPairX509Codec();
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default:
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throw new KeyAgreementException("Unknown key-type for X.509 format: "
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+ keyType);
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}
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case Registry.PKCS8_ENCODING_ID:
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switch (keyType)
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{
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case 0:
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return new DSSKeyPairPKCS8Codec();
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case 1:
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return new RSAKeyPairPKCS8Codec();
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case 2:
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return new DHKeyPairPKCS8Codec();
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default:
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throw new KeyAgreementException("Unknown key-type for PKCS#8 format: "
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+ keyType);
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}
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default:
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throw new KeyAgreementException("Unknown format identifier: "
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+ formatID);
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}
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}
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}
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