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Diffstat (limited to 'gnu/javax/crypto/key/OutgoingMessage.java')
| -rw-r--r-- | gnu/javax/crypto/key/OutgoingMessage.java | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/gnu/javax/crypto/key/OutgoingMessage.java b/gnu/javax/crypto/key/OutgoingMessage.java new file mode 100644 index 000000000..588012120 --- /dev/null +++ b/gnu/javax/crypto/key/OutgoingMessage.java @@ -0,0 +1,255 @@ +/* OutgoingMessage.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.dss.DSSKey; +import gnu.java.security.key.rsa.GnuRSAKey; +import gnu.java.security.util.FormatUtil; +import gnu.javax.crypto.key.dh.GnuDHKey; +import gnu.javax.crypto.key.srp6.SRPKey; + +import java.io.ByteArrayOutputStream; +import java.io.UnsupportedEncodingException; +import java.security.Key; +import java.security.PrivateKey; +import java.security.PublicKey; +import java.math.BigInteger; + +/** + * <p>An implementation of outgoing messages for use with key agreement + * protocols.</p> + */ +public class OutgoingMessage +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + /** The internal output stream. */ + private ByteArrayOutputStream out; + + // Constructor(s) + // ------------------------------------------------------------------------- + + public OutgoingMessage() + { + super(); + + out = new ByteArrayOutputStream(); + } + + // Class methods + // ------------------------------------------------------------------------- + + // Instance methods + // ------------------------------------------------------------------------- + + /** + * <p>Returns the encoded form of the current message including the 4-byte + * length header.</p> + * + * @throws KeyAgreementException if an encoding size constraint is violated. + */ + public byte[] toByteArray() throws KeyAgreementException + { + byte[] buffer = wrap(); + int length = buffer.length; + byte[] result = new byte[length + 4]; + result[0] = (byte) (length >>> 24); + result[1] = (byte) (length >>> 16); + result[2] = (byte) (length >>> 8); + result[3] = (byte) length; + System.arraycopy(buffer, 0, result, 4, length); + + return result; + } + + /** + * <p>Returns the encoded form of the current message excluding the 4-byte + * length header.</p> + * + * @throws KeyAgreementException if an encoding size constraint is violated. + */ + public byte[] wrap() throws KeyAgreementException + { + int length = out.size(); + if (length > Registry.SASL_BUFFER_MAX_LIMIT || length < 0) + { + throw new KeyAgreementException("message content is too long"); + } + return out.toByteArray(); + } + + /** + * Encodes a public key into the message. + * <p> + * When a public key is encoded into an outgoing message, the byte array of + * the encoded key --according to its encoding/decoding format specified when + * the key was first instantiated-- are put in the message (a) preceeded by + * one byte representing both the type of key (upper 4-bit) and the identifier + * of the format used (lower 4-bit), and (b) preceeed by a 4-byte entity + * representing the total length, excluding these 4 bytes, of the bytes + * representing the encoded key and the one-byte representing the key-type and + * format; i.e. + * + * <pre> + * key --> 4-byte-length || 1-byte-type-and-format || encoded-key-bytes + * </pre> + * + * @param k the public key to encode. + * @throws KeyAgreementException if an encoding size constraint is violated. + */ + public void writePublicKey(PublicKey k) throws KeyAgreementException + { + writeKey(k); + } + + /** + * Encodes a private key into the message. + * <p> + * When a private key is encoded into an outgoing message, the byte array of + * the encoded key --according to its encoding/decoding format specified when + * the key was first instantiated-- are put in the message (a) preceeded by + * one byte representing both the type of key (upper 4-bit) and the identifier + * of the format used (lower 4-bit), and (b) preceeed by a 4-byte entity + * representing the total length, excluding these 4 bytes, of the bytes + * representing the encoded key and the one-byte representing the key-type and + * format; i.e. + * + * <pre> + * key --> 4-byte-length || 1-byte-type-and-format || encoded-key-bytes + * </pre> + * + * @param k the private key to encode. + * @throws KeyAgreementException if an encoding size constraint is violated. + */ + public void writePrivateKey(PrivateKey k) throws KeyAgreementException + { + writeKey(k); + } + + /** + * <p>Encodes an MPI into the message.</p> + * + * @param val the MPI to encode. + * @throws KeyAgreementException if an encoding size constraint is violated. + */ + public void writeMPI(BigInteger val) throws KeyAgreementException + { + byte[] b = val.toByteArray(); + int length = b.length; + if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT) + { + throw new KeyAgreementException("MPI is too long"); + } + byte[] lengthBytes = { (byte) (length >>> 8), (byte) length }; + out.write(lengthBytes, 0, 2); + out.write(b, 0, b.length); + } + + /** + * <p>Encodes a string into the message.</p> + * + * @param s the string to encode. + * @throws KeyAgreementException if the UTF8 encoding is not supported on + * this platform, or if an encoding size constraint is violated. + */ + public void writeString(String s) throws KeyAgreementException + { + byte[] b = null; + try + { + b = s.getBytes("UTF8"); + } + catch (UnsupportedEncodingException x) + { + throw new KeyAgreementException("unxupported UTF8 encoding", x); + } + int length = b.length; + if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT) + { + throw new KeyAgreementException("text too long"); + } + byte[] lengthBytes = { (byte) (length >>> 8), (byte) length }; + out.write(lengthBytes, 0, 2); + out.write(b, 0, b.length); + } + + /** + * @param k the key to encode. + * @throws KeyAgreementException if an encoding size constraint is violated. + */ + private void writeKey(Key k) throws KeyAgreementException + { + byte[] b = k.getEncoded(); + int keyType = getKeyType(k); + int formatID = FormatUtil.getFormatID(k.getFormat()); + int length = b.length + 1; + if (length > Registry.SASL_FOUR_BYTE_MAX_LIMIT) + throw new KeyAgreementException("Encoded key is too long"); + + byte[] lengthBytes = { (byte) (length >>> 24), (byte) (length >>> 16), + (byte) (length >>> 8), (byte) length }; + out.write(lengthBytes, 0, 4); + out.write(((keyType & 0x0F) << 4) | (formatID & 0x0F)); + out.write(b, 0, b.length); + } + + /** + * @param k the key to find an identifier for. + * @return an integer from <code>0</code> to <code>3</code> identifying + * the type of key. + * @throws KeyAgreementException if the designated key is of unknown or + * unsupported type. + */ + private int getKeyType(Key k) throws KeyAgreementException + { + if (k instanceof DSSKey) + return 0; + if (k instanceof GnuRSAKey) + return 1; + if (k instanceof GnuDHKey) + return 2; + if (k instanceof SRPKey) + return 3; + throw new KeyAgreementException("Unknown or unsupported key type: " + + k.getClass().getName()); + } +}
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