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Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/key/srp6/SRPKeyPairRawCodec.java')
-rw-r--r-- | libjava/classpath/gnu/javax/crypto/key/srp6/SRPKeyPairRawCodec.java | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/key/srp6/SRPKeyPairRawCodec.java b/libjava/classpath/gnu/javax/crypto/key/srp6/SRPKeyPairRawCodec.java new file mode 100644 index 00000000000..39234b6271f --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/key/srp6/SRPKeyPairRawCodec.java @@ -0,0 +1,380 @@ +/* SRPKeyPairRawCodec.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.srp6; + +import gnu.java.security.Registry; +import gnu.java.security.key.IKeyPairCodec; + +import java.io.ByteArrayOutputStream; +import java.math.BigInteger; +import java.security.PrivateKey; +import java.security.PublicKey; + +/** + * <p>An object that implements the {@link IKeyPairCodec} operations for the + * <i>Raw</i> format to use with SRP keypairs.</p> + * + * <p>Reference:</p> + * <ol> + * <li><a href="http://srp.stanford.edu/design.html">SRP Protocol Design</a><br> + * Thomas J. Wu.</li> + * </ol> + */ +public class SRPKeyPairRawCodec implements IKeyPairCodec +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + // Constructor(s) + // ------------------------------------------------------------------------- + + // implicit 0-arguments constructor + + // Class methods + // ------------------------------------------------------------------------- + + // Instance methods + // ------------------------------------------------------------------------- + + // gnu.crypto.keys.IKeyPairCodec interface implementation ------------------ + + public int getFormatID() + { + return RAW_FORMAT; + } + + /** + * <p>Returns the encoded form of the designated SRP public key according to + * the <i>Raw</i> format supported by this library.</p> + * + * <p>The <i>Raw</i> format for an SRP public key, in this implementation, is + * a byte sequence consisting of the following:</p> + * <ol> + * <li>4-byte magic consisting of the value of the literal + * {@link Registry#MAGIC_RAW_SRP_PUBLIC_KEY},<li> + * <li>1-byte version consisting of the constant: 0x01,</li> + * <li>4-byte count of following bytes representing the SRP parameter + * <code>N</code> in internet order,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the SRP parameter + * <code>N</code>,</li> + * <li>4-byte count of following bytes representing the SRP parameter + * <code>g</code>,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the SRP parameter + * <code>g</code>,</li> + * <li>4-byte count of following bytes representing the SRP parameter + * <code>y</code>,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the SRP parameter + * <code>y</code>,</li> + * </ol> + * + * @param key the key to encode. + * @return the <i>Raw</i> format encoding of the designated key. + * @throws IllegalArgumentException if the designated key is not an SRP one. + */ + public byte[] encodePublicKey(PublicKey key) + { + if (!(key instanceof SRPPublicKey)) + { + throw new IllegalArgumentException("key"); + } + + SRPPublicKey srpKey = (SRPPublicKey) key; + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + + // magic + baos.write(Registry.MAGIC_RAW_SRP_PUBLIC_KEY[0]); + baos.write(Registry.MAGIC_RAW_SRP_PUBLIC_KEY[1]); + baos.write(Registry.MAGIC_RAW_SRP_PUBLIC_KEY[2]); + baos.write(Registry.MAGIC_RAW_SRP_PUBLIC_KEY[3]); + + // version + baos.write(0x01); + + // N + byte[] buffer = srpKey.getN().toByteArray(); + int length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + + // g + buffer = srpKey.getG().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + + // y + buffer = srpKey.getY().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + + return baos.toByteArray(); + } + + public PublicKey decodePublicKey(byte[] k) + { + // magic + if (k[0] != Registry.MAGIC_RAW_SRP_PUBLIC_KEY[0] + || k[1] != Registry.MAGIC_RAW_SRP_PUBLIC_KEY[1] + || k[2] != Registry.MAGIC_RAW_SRP_PUBLIC_KEY[2] + || k[3] != Registry.MAGIC_RAW_SRP_PUBLIC_KEY[3]) + { + throw new IllegalArgumentException("magic"); + } + + // version + if (k[4] != 0x01) + { + throw new IllegalArgumentException("version"); + } + int i = 5; + + int l; + byte[] buffer; + + // N + l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger N = new BigInteger(1, buffer); + + // g + l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger g = new BigInteger(1, buffer); + + // y + l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger y = new BigInteger(1, buffer); + + return new SRPPublicKey(N, g, y); + } + + /** + * <p>Returns the encoded form of the designated SRP private key according to + * the <i>Raw</i> format supported by this library.</p> + * + * <p>The <i>Raw</i> format for an SRP private key, in this implementation, + * is a byte sequence consisting of the following:</p> + * <ol> + * <li>4-byte magic consisting of the value of the literal + * {@link Registry#MAGIC_RAW_SRP_PRIVATE_KEY},<li> + * <li>1-byte version consisting of the constant: 0x01,</li> + * <li>4-byte count of following bytes representing the SRP parameter + * <code>N</code> in internet order,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the SRP parameter + * <code>N</code>,</li> + * <li>4-byte count of following bytes representing the SRP parameter + * <code>g</code>,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the SRP parameter + * <code>g</code>,</li> + * <li>4-byte count of following bytes representing the SRP parameter + * <code>x</code>,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the SRP parameter + * <code>x</code>,</li> + * <li>one byte which indicates whether the SRP parameter <code>v</code> + * is included in this encoding (value <code>0x01</code>) or not + * (value <code>0x00</code>).</li> + * <li>4-byte count of following bytes representing the SRP parameter + * <code>v</code>,</li> + * <li>n-bytes representation of a {@link BigInteger} obtained by invoking + * the <code>toByteArray()</code> method on the SRP parameter + * <code>v</code>,</li> + * </ol> + * + * @param key the key to encode. + * @return the <i>Raw</i> format encoding of the designated key. + * @throws IllegalArgumentException if the designated key is not an SRP one. + */ + public byte[] encodePrivateKey(PrivateKey key) + { + if (!(key instanceof SRPPrivateKey)) + { + throw new IllegalArgumentException("key"); + } + + SRPPrivateKey srpKey = (SRPPrivateKey) key; + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + + // magic + baos.write(Registry.MAGIC_RAW_SRP_PRIVATE_KEY[0]); + baos.write(Registry.MAGIC_RAW_SRP_PRIVATE_KEY[1]); + baos.write(Registry.MAGIC_RAW_SRP_PRIVATE_KEY[2]); + baos.write(Registry.MAGIC_RAW_SRP_PRIVATE_KEY[3]); + + // version + baos.write(0x01); + + // N + byte[] buffer = srpKey.getN().toByteArray(); + int length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + + // g + buffer = srpKey.getG().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + + // x + buffer = srpKey.getX().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + + // v + if (srpKey.getV() != null) + { + baos.write(0x01); + + buffer = srpKey.getV().toByteArray(); + length = buffer.length; + baos.write(length >>> 24); + baos.write((length >>> 16) & 0xFF); + baos.write((length >>> 8) & 0xFF); + baos.write(length & 0xFF); + baos.write(buffer, 0, length); + } + else + { + baos.write(0x00); + } + + return baos.toByteArray(); + } + + public PrivateKey decodePrivateKey(byte[] k) + { + // magic + if (k[0] != Registry.MAGIC_RAW_SRP_PRIVATE_KEY[0] + || k[1] != Registry.MAGIC_RAW_SRP_PRIVATE_KEY[1] + || k[2] != Registry.MAGIC_RAW_SRP_PRIVATE_KEY[2] + || k[3] != Registry.MAGIC_RAW_SRP_PRIVATE_KEY[3]) + { + throw new IllegalArgumentException("magic"); + } + + // version + if (k[4] != 0x01) + { + throw new IllegalArgumentException("version"); + } + int i = 5; + + int l; + byte[] buffer; + + // N + l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger N = new BigInteger(1, buffer); + + // g + l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger g = new BigInteger(1, buffer); + + // x + l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger x = new BigInteger(1, buffer); + + // v + l = k[i++]; + if (l == 0x01) + { + l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 + | (k[i++] & 0xFF); + buffer = new byte[l]; + System.arraycopy(k, i, buffer, 0, l); + i += l; + BigInteger v = new BigInteger(1, buffer); + + return new SRPPrivateKey(N, g, x, v); + } + else + { + return new SRPPrivateKey(N, g, x); + } + } +} |