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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/IncomingMessage.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/IncomingMessage.java | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/IncomingMessage.java b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/IncomingMessage.java new file mode 100644 index 000000000..9701d80a7 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/IncomingMessage.java @@ -0,0 +1,318 @@ +/* IncomingMessage.java -- + Copyright (C) 2003, 2006 Free Software Foundation, Inc. + +This file is a 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 of the License, 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; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, 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 gnu.javax.crypto.key; + +import gnu.java.security.Registry; +import gnu.java.security.key.IKeyPairCodec; +import gnu.java.security.key.dss.DSSKeyPairPKCS8Codec; +import gnu.java.security.key.dss.DSSKeyPairRawCodec; +import gnu.java.security.key.dss.DSSKeyPairX509Codec; +import gnu.java.security.key.rsa.RSAKeyPairPKCS8Codec; +import gnu.java.security.key.rsa.RSAKeyPairRawCodec; +import gnu.java.security.key.rsa.RSAKeyPairX509Codec; +import gnu.javax.crypto.key.dh.DHKeyPairPKCS8Codec; +import gnu.javax.crypto.key.dh.DHKeyPairRawCodec; +import gnu.javax.crypto.key.dh.DHKeyPairX509Codec; +import gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec; + +import java.io.ByteArrayInputStream; +import java.io.UnsupportedEncodingException; +import java.math.BigInteger; +import java.security.PrivateKey; +import java.security.PublicKey; + +/** + * An implementation of an incoming message for use with key agreement + * protocols. + */ +public class IncomingMessage +{ + /** The internal buffer stream containing the message's contents. */ + protected ByteArrayInputStream in; + /** The length of the message contents, according to its 4-byte header. */ + protected int length; + + /** + * Constructs an incoming message given the message's encoded form, including + * its header bytes. + * + * @param b the encoded form, including the header bytes, of an incoming + * message. + * @throws KeyAgreementException if the buffer is malformed. + */ + public IncomingMessage(byte[] b) throws KeyAgreementException + { + this(); + + if (b.length < 4) + throw new KeyAgreementException("message header too short"); + length = b[0] << 24 + | (b[1] & 0xFF) << 16 + | (b[2] & 0xFF) << 8 + | (b[3] & 0xFF); + if (length > Registry.SASL_BUFFER_MAX_LIMIT || length < 0) + throw new KeyAgreementException("message size limit exceeded"); + in = new ByteArrayInputStream(b, 4, length); + } + + /** Trivial private constructor for use by the class method. */ + private IncomingMessage() + { + super(); + } + + /** + * Returns an instance of a message given its encoded contents, excluding the + * message's header bytes. + * <p> + * Calls the method with the same name and three arguments as: + * <code>getInstance(raw, 0, raw.length)</code>. + * + * @param raw the encoded form, excluding the header bytes. + * @return a new instance of <code>IncomingMessage</code>. + */ + public static IncomingMessage getInstance(byte[] raw) + { + return getInstance(raw, 0, raw.length); + } + + /** + * Returns an instance of a message given its encoded contents, excluding the + * message's header bytes. + * + * @param raw the encoded form, excluding the header bytes. + * @param offset offset where to start using raw bytes from. + * @param len number of bytes to use. + * @return a new instance of <code>IncomingMessage</code>. + */ + public static IncomingMessage getInstance(byte[] raw, int offset, int len) + { + IncomingMessage result = new IncomingMessage(); + result.in = new ByteArrayInputStream(raw, offset, len); + return result; + } + + /** + * Converts two octets into the number that they represent. + * + * @param b the two octets. + * @return the length. + */ + public static int twoBytesToLength(byte[] b) throws KeyAgreementException + { + int result = (b[0] & 0xFF) << 8 | (b[1] & 0xFF); + if (result > Registry.SASL_TWO_BYTE_MAX_LIMIT) + throw new KeyAgreementException("encoded MPI size limit exceeded"); + return result; + } + + /** + * Converts four octets into the number that they represent. + * + * @param b the four octets. + * @return the length. + */ + public static int fourBytesToLength(byte[] b) throws KeyAgreementException + { + int result = b[0] << 24 + | (b[1] & 0xFF) << 16 + | (b[2] & 0xFF) << 8 + | (b[3] & 0xFF); + if (result > Registry.SASL_FOUR_BYTE_MAX_LIMIT || result < 0) + throw new KeyAgreementException("encoded entity size limit exceeded"); + return result; + } + + public boolean hasMoreElements() + { + return (in.available() > 0); + } + + /** + * Decodes a public key from the message. + * <p> + * See {@link OutgoingMessage#writePublicKey(java.security.PublicKey)} for + * more details on the internal format. + * + * @throws KeyAgreementException if an encoding size constraint is violated or + * a mismatch was detected in the encoding. + */ + public PublicKey readPublicKey() throws KeyAgreementException + { + if (in.available() < 5) + throw new KeyAgreementException("not enough bytes for a public key in message"); + byte[] elementLengthBytes = new byte[4]; + in.read(elementLengthBytes, 0, 4); + int elementLength = fourBytesToLength(elementLengthBytes); + if (in.available() < elementLength) + throw new KeyAgreementException("illegal public key encoding"); + int keyTypeAndFormatID = in.read() & 0xFF; + elementLength--; + byte[] kb = new byte[elementLength]; + in.read(kb, 0, elementLength); + // instantiate the right codec and decode + IKeyPairCodec kpc = getKeyPairCodec(keyTypeAndFormatID); + return kpc.decodePublicKey(kb); + } + + /** + * Decodes a private key from the message. + * <p> + * See {@link OutgoingMessage#writePrivateKey(java.security.PrivateKey)} for + * more details. + * + * @throws KeyAgreementException if an encoding size constraint is violated or + * a mismatch was detected in the encoding. + */ + public PrivateKey readPrivateKey() throws KeyAgreementException + { + if (in.available() < 5) + throw new KeyAgreementException("not enough bytes for a private key in message"); + byte[] elementLengthBytes = new byte[4]; + in.read(elementLengthBytes, 0, 4); + int elementLength = fourBytesToLength(elementLengthBytes); + if (in.available() < elementLength) + throw new KeyAgreementException("illegal private key encoding"); + int keyTypeAndFormatID = in.read() & 0xFF; + elementLength--; + byte[] kb = new byte[elementLength]; + in.read(kb, 0, elementLength); + // instantiate the right codec and decode + IKeyPairCodec kpc = getKeyPairCodec(keyTypeAndFormatID); + return kpc.decodePrivateKey(kb); + } + + /** + * Decodes an MPI from the current message's contents. + * + * @return a native representation of an MPI. + * @throws KeyAgreementException if an encoding exception occurs during the + * operation. + */ + public BigInteger readMPI() throws KeyAgreementException + { + if (in.available() < 2) + throw new KeyAgreementException("not enough bytes for an MPI in message"); + byte[] elementLengthBytes = new byte[2]; + in.read(elementLengthBytes, 0, 2); + int elementLength = twoBytesToLength(elementLengthBytes); + if (in.available() < elementLength) + throw new KeyAgreementException("illegal MPI encoding"); + byte[] element = new byte[elementLength]; + in.read(element, 0, element.length); + return new BigInteger(1, element); + } + + public String readString() throws KeyAgreementException + { + if (in.available() < 2) + throw new KeyAgreementException("not enough bytes for a text in message"); + byte[] elementLengthBytes = new byte[2]; + in.read(elementLengthBytes, 0, 2); + int elementLength = twoBytesToLength(elementLengthBytes); + if (in.available() < elementLength) + throw new KeyAgreementException("illegal text encoding"); + byte[] element = new byte[elementLength]; + in.read(element, 0, element.length); + String result = null; + try + { + result = new String(element, "UTF8"); + } + catch (UnsupportedEncodingException x) + { + throw new KeyAgreementException("unxupported UTF8 encoding", x); + } + return result; + } + + private IKeyPairCodec getKeyPairCodec(int keyTypeAndFormatID) + throws KeyAgreementException + { + int keyType = (keyTypeAndFormatID >>> 4) & 0x0F; + int formatID = keyTypeAndFormatID & 0x0F; + switch (formatID) + { + case Registry.RAW_ENCODING_ID: + switch (keyType) + { + case 0: + return new DSSKeyPairRawCodec(); + case 1: + return new RSAKeyPairRawCodec(); + case 2: + return new DHKeyPairRawCodec(); + case 3: + return new SRPKeyPairRawCodec(); + default: + throw new KeyAgreementException("Unknown key-type for Raw format: " + + keyType); + } + case Registry.X509_ENCODING_ID: + switch (keyType) + { + case 0: + return new DSSKeyPairX509Codec(); + case 1: + return new RSAKeyPairX509Codec(); + case 2: + return new DHKeyPairX509Codec(); + default: + throw new KeyAgreementException("Unknown key-type for X.509 format: " + + keyType); + } + case Registry.PKCS8_ENCODING_ID: + switch (keyType) + { + case 0: + return new DSSKeyPairPKCS8Codec(); + case 1: + return new RSAKeyPairPKCS8Codec(); + case 2: + return new DHKeyPairPKCS8Codec(); + default: + throw new KeyAgreementException("Unknown key-type for PKCS#8 format: " + + keyType); + } + default: + throw new KeyAgreementException("Unknown format identifier: " + + formatID); + } + } +} |