ElGamal classes, from Bouncy Castle 1.53, for I2PProvider.

License: BSD
Encoding/decoding/sigs: todo.

LICENSE.txt

@@ -40,6 +40,10 @@ Public domain except as listed below:
    Copyright (c) 2000 - 2004 The Legion Of The Bouncy Castle
    See licenses/LICENSE-SHA256.txt
 
+   ElGamal:
+   Copyright (c) 2000 - 2013 The Legion of the Bouncy Castle Inc. (http://www.bouncycastle.org)
+   See licenses/LICENSE-SHA256.txt
+
    AES code:
    Copyright (c) 1995-2005 The Cryptix Foundation Limited.
    See licenses/LICENSE-Cryptix.txt

core/java/src/net/i2p/crypto/CryptoConstants.java

@@ -34,6 +34,7 @@ import java.math.BigInteger;
 import java.security.spec.AlgorithmParameterSpec;
 import java.security.spec.DSAParameterSpec;
 
+import net.i2p.crypto.elgamal.spec.ElGamalParameterSpec;
 import net.i2p.util.NativeBigInteger;
 
 /**

core/java/src/net/i2p/crypto/elgamal/ElGamalKey.java

+package net.i2p.crypto.elgamal;
+
+import javax.crypto.interfaces.DHKey;
+
+import net.i2p.crypto.elgamal.spec.ElGamalParameterSpec;
+
+public interface ElGamalKey
+    extends DHKey
+{
+    public ElGamalParameterSpec getParameters();
+}

core/java/src/net/i2p/crypto/elgamal/ElGamalPrivateKey.java

+package net.i2p.crypto.elgamal;
+
+import java.math.BigInteger;
+
+import javax.crypto.interfaces.DHPrivateKey;
+
+public interface ElGamalPrivateKey
+    extends ElGamalKey, DHPrivateKey
+{
+    public BigInteger getX();
+}

core/java/src/net/i2p/crypto/elgamal/ElGamalPublicKey.java

+package net.i2p.crypto.elgamal;
+
+import java.math.BigInteger;
+
+import javax.crypto.interfaces.DHPublicKey;
+
+public interface ElGamalPublicKey
+    extends ElGamalKey, DHPublicKey
+{
+    public BigInteger getY();
+}

core/java/src/net/i2p/crypto/elgamal/impl/ElGamalPrivateKeyImpl.java

+package net.i2p.crypto.elgamal.impl;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.math.BigInteger;
+
+import javax.crypto.interfaces.DHPrivateKey;
+import javax.crypto.spec.DHParameterSpec;
+import javax.crypto.spec.DHPrivateKeySpec;
+
+import net.i2p.crypto.elgamal.ElGamalPrivateKey;
+import net.i2p.crypto.elgamal.spec.ElGamalParameterSpec;
+import net.i2p.crypto.elgamal.spec.ElGamalPrivateKeySpec;
+
+public class ElGamalPrivateKeyImpl
+    implements ElGamalPrivateKey, DHPrivateKey
+{
+    static final long serialVersionUID = 4819350091141529678L;
+        
+    BigInteger      x;
+
+    ElGamalParameterSpec   elSpec;
+
+    protected ElGamalPrivateKeyImpl()
+    {
+    }
+
+    ElGamalPrivateKeyImpl(
+        ElGamalPrivateKey    key)
+    {
+        this.x = key.getX();
+        this.elSpec = key.getParameters();
+    }
+
+    ElGamalPrivateKeyImpl(
+        DHPrivateKey    key)
+    {
+        this.x = key.getX();
+        this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
+    }
+    
+    ElGamalPrivateKeyImpl(
+        ElGamalPrivateKeySpec    spec)
+    {
+        this.x = spec.getX();
+        this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG());
+    }
+
+    ElGamalPrivateKeyImpl(
+        DHPrivateKeySpec    spec)
+    {
+        this.x = spec.getX();
+        this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG());
+    }
+    
+    public String getAlgorithm()
+    {
+        return "ElGamal";
+    }
+
+    /**
+     * return the encoding format we produce in getEncoded().
+     *
+     * @return the string "PKCS#8"
+     */
+    public String getFormat()
+    {
+        return "PKCS#8";
+    }
+
+    /**
+     * Return a PKCS8 representation of the key. The sequence returned
+     * represents a full PrivateKeyInfo object.
+     *
+     * @return a PKCS8 representation of the key.
+     */
+    public byte[] getEncoded()
+    {
+        return null;
+    }
+
+    public ElGamalParameterSpec getParameters()
+    {
+        return elSpec;
+    }
+
+    public DHParameterSpec getParams()
+    {
+        return new DHParameterSpec(elSpec.getP(), elSpec.getG());
+    }
+    
+    public BigInteger getX()
+    {
+        return x;
+    }
+
+    private void readObject(
+        ObjectInputStream   in)
+        throws IOException, ClassNotFoundException
+    {
+        x = (BigInteger)in.readObject();
+
+        this.elSpec = new ElGamalParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject());
+    }
+
+    private void writeObject(
+        ObjectOutputStream  out)
+        throws IOException
+    {
+        out.writeObject(this.getX());
+        out.writeObject(elSpec.getP());
+        out.writeObject(elSpec.getG());
+    }
+}

core/java/src/net/i2p/crypto/elgamal/impl/ElGamalPublicKeyImpl.java

+package net.i2p.crypto.elgamal.impl;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.math.BigInteger;
+
+import javax.crypto.interfaces.DHPublicKey;
+import javax.crypto.spec.DHParameterSpec;
+import javax.crypto.spec.DHPublicKeySpec;
+
+import net.i2p.crypto.elgamal.ElGamalPublicKey;
+import net.i2p.crypto.elgamal.spec.ElGamalParameterSpec;
+import net.i2p.crypto.elgamal.spec.ElGamalPublicKeySpec;
+
+public class ElGamalPublicKeyImpl
+    implements ElGamalPublicKey, DHPublicKey
+{
+    static final long serialVersionUID = 8712728417091216948L;
+        
+    private BigInteger              y;
+    private ElGamalParameterSpec    elSpec;
+
+    ElGamalPublicKeyImpl(
+        ElGamalPublicKeySpec    spec)
+    {
+        this.y = spec.getY();
+        this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG());
+    }
+
+    ElGamalPublicKeyImpl(
+        DHPublicKeySpec    spec)
+    {
+        this.y = spec.getY();
+        this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG());
+    }
+    
+    ElGamalPublicKeyImpl(
+        ElGamalPublicKey    key)
+    {
+        this.y = key.getY();
+        this.elSpec = key.getParameters();
+    }
+
+    ElGamalPublicKeyImpl(
+        DHPublicKey    key)
+    {
+        this.y = key.getY();
+        this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
+    }
+    
+    ElGamalPublicKeyImpl(
+        BigInteger              y,
+        ElGamalParameterSpec    elSpec)
+    {
+        this.y = y;
+        this.elSpec = elSpec;
+    }
+
+    public String getAlgorithm()
+    {
+        return "ElGamal";
+    }
+
+    public String getFormat()
+    {
+        return "X.509";
+    }
+
+    public byte[] getEncoded()
+    {
+        return null;
+    }
+
+    public ElGamalParameterSpec getParameters()
+    {
+        return elSpec;
+    }
+    
+    public DHParameterSpec getParams()
+    {
+        return new DHParameterSpec(elSpec.getP(), elSpec.getG());
+    }
+
+    public BigInteger getY()
+    {
+        return y;
+    }
+
+    private void readObject(
+        ObjectInputStream   in)
+        throws IOException, ClassNotFoundException
+    {
+        this.y = (BigInteger)in.readObject();
+        this.elSpec = new ElGamalParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject());
+    }
+
+    private void writeObject(
+        ObjectOutputStream  out)
+        throws IOException
+    {
+        out.writeObject(this.getY());
+        out.writeObject(elSpec.getP());
+        out.writeObject(elSpec.getG());
+    }
+}

core/java/src/net/i2p/crypto/elgamal/impl/package.html

+<html><body>
+<p>
+   Implementation of ElGamal keys, used for I2PProvider.
+   Modified from Bouncy Castle 1.53.
+   See net.i2p.crypto.elgamal for license info.
+</p><p>
+   Since 0.9.25.
+</p>
+</body></html>

core/java/src/net/i2p/crypto/elgamal/package.html

+<html><body>
+<p>
+   Interfaces for ElGamal keys, used for I2PProvider.
+   Copied from Bouncy Castle 1.53.
+</p><p>
+   Since 0.9.25.
+</p><p><pre>
+
+
+Copyright (c) 2000 - 2013 The Legion of the Bouncy Castle Inc. (http://www.bouncycastle.org)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+and associated documentation files (the "Software"), to deal in the Software without restriction,
+including without limitation the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+</pre></p>
+</body></html>

core/java/src/net/i2p/crypto/elgamal/spec/ElGamalGenParameterSpec.java

+package net.i2p.crypto.elgamal.spec;
+
+import java.security.spec.AlgorithmParameterSpec;
+
+public class ElGamalGenParameterSpec
+    implements AlgorithmParameterSpec
+{
+    private int primeSize;
+
+    /*
+     * @param primeSize the size (in bits) of the prime modulus.
+     */
+    public ElGamalGenParameterSpec(
+        int     primeSize)
+    {
+        this.primeSize = primeSize;
+    }
+
+    /**
+     * Returns the size in bits of the prime modulus.
+     *
+     * @return the size in bits of the prime modulus
+     */
+    public int getPrimeSize()
+    {
+        return primeSize;
+    }
+}

core/java/src/net/i2p/crypto/elgamal/spec/ElGamalKeySpec.java

+package net.i2p.crypto.elgamal.spec;
+
+import java.security.spec.KeySpec;
+
+public class ElGamalKeySpec
+    implements KeySpec
+{
+    private ElGamalParameterSpec  spec;
+
+    public ElGamalKeySpec(
+        ElGamalParameterSpec  spec)
+    {
+        this.spec = spec;
+    }
+
+    public ElGamalParameterSpec getParams()
+    {
+        return spec;
+    }
+}

core/java/src/net/i2p/crypto/ElGamalParameterSpec.java → core/java/src/net/i2p/crypto/elgamal/spec/ElGamalParameterSpec.java

-package net.i2p.crypto;
-
-/*
- * Copyright (c) 2000 - 2013 The Legion of the Bouncy Castle Inc. (http://www.bouncycastle.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
- * and associated documentation files (the "Software"), to deal in the Software without restriction,
- * including without limitation the rights to use, copy, modify, merge, publish, distribute,
- * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
- * is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all copies or
- * substantial portions of the Software.
- *
- *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
- * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
- * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- */
+package net.i2p.crypto.elgamal.spec;
 
 import java.math.BigInteger;
 import java.security.spec.AlgorithmParameterSpec;

core/java/src/net/i2p/crypto/elgamal/spec/ElGamalPrivateKeySpec.java

+package net.i2p.crypto.elgamal.spec;
+
+import java.math.BigInteger;
+
+/**
+ * This class specifies an ElGamal private key with its associated parameters.
+ *
+ * @see ElGamalPublicKeySpec
+ */
+public class ElGamalPrivateKeySpec
+    extends ElGamalKeySpec
+{
+    private BigInteger  x;
+
+    public ElGamalPrivateKeySpec(
+        BigInteger              x,
+        ElGamalParameterSpec    spec)
+    {
+        super(spec);
+
+        this.x = x;
+    }
+
+    /**
+     * Returns the private value <code>x</code>.
+     *
+     * @return the private value <code>x</code>
+     */
+    public BigInteger getX()
+    {
+        return x;
+    }
+}

core/java/src/net/i2p/crypto/elgamal/spec/ElGamalPublicKeySpec.java

+package net.i2p.crypto.elgamal.spec;
+
+import java.math.BigInteger;
+
+/**
+ * This class specifies an ElGamal public key with its associated parameters.
+ *
+ * @see ElGamalPrivateKeySpec
+ */
+public class ElGamalPublicKeySpec
+    extends ElGamalKeySpec
+{
+    private BigInteger  y;
+
+    public ElGamalPublicKeySpec(
+        BigInteger              y,
+        ElGamalParameterSpec    spec)
+    {
+        super(spec);
+
+        this.y = y;
+    }
+
+    /**
+     * Returns the public value <code>y</code>.
+     *
+     * @return the public value <code>y</code>
+     */
+    public BigInteger getY()
+    {
+        return y;
+    }
+}

core/java/src/net/i2p/crypto/elgamal/spec/package.html

+<html><body>
+<p>
+   Specs ElGamal keys, used for I2PProvider.
+   Copied from Bouncy Castle 1.53.
+   See net.i2p.crypto.elgamal for license info.
+</p><p>
+   Since 0.9.25.
+</p>
+</body></html>