1 files changed, 139 insertions, 0 deletions
diff --git a/prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPublicKey.java b/prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPublicKey.java
new file mode 100644
index 00000000..20844456
--- /dev/null
+++ b/prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPublicKey.java
@@ -0,0 +1,139 @@
+package org.spongycastle.jce.provider;
+
+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 org.spongycastle.asn1.ASN1Integer;
+import org.spongycastle.asn1.oiw.ElGamalParameter;
+import org.spongycastle.asn1.oiw.OIWObjectIdentifiers;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
+import org.spongycastle.crypto.params.ElGamalPublicKeyParameters;
+import org.spongycastle.jcajce.provider.asymmetric.util.KeyUtil;
+import org.spongycastle.jce.interfaces.ElGamalPublicKey;
+import org.spongycastle.jce.spec.ElGamalParameterSpec;
+import org.spongycastle.jce.spec.ElGamalPublicKeySpec;
+
+public class JCEElGamalPublicKey
+    implements ElGamalPublicKey, DHPublicKey
+{
+    static final long serialVersionUID = 8712728417091216948L;
+        
+    private BigInteger              y;
+    private ElGamalParameterSpec    elSpec;
+
+    JCEElGamalPublicKey(
+        ElGamalPublicKeySpec    spec)
+    {
+        this.y = spec.getY();
+        this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG());
+    }
+
+    JCEElGamalPublicKey(
+        DHPublicKeySpec    spec)
+    {
+        this.y = spec.getY();
+        this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG());
+    }
+    
+    JCEElGamalPublicKey(
+        ElGamalPublicKey    key)
+    {
+        this.y = key.getY();
+        this.elSpec = key.getParameters();
+    }
+
+    JCEElGamalPublicKey(
+        DHPublicKey    key)
+    {
+        this.y = key.getY();
+        this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
+    }
+    
+    JCEElGamalPublicKey(
+        ElGamalPublicKeyParameters  params)
+    {
+        this.y = params.getY();
+        this.elSpec = new ElGamalParameterSpec(params.getParameters().getP(), params.getParameters().getG());
+    }
+
+    JCEElGamalPublicKey(
+        BigInteger              y,
+        ElGamalParameterSpec    elSpec)
+    {
+        this.y = y;
+        this.elSpec = elSpec;
+    }
+
+    JCEElGamalPublicKey(
+        SubjectPublicKeyInfo    info)
+    {
+        ElGamalParameter        params = ElGamalParameter.getInstance(info.getAlgorithm().getParameters());
+        ASN1Integer              derY = null;
+
+        try
+        {
+            derY = (ASN1Integer)info.parsePublicKey();
+        }
+        catch (IOException e)
+        {
+            throw new IllegalArgumentException("invalid info structure in DSA public key");
+        }
+
+        this.y = derY.getValue();
+        this.elSpec = new ElGamalParameterSpec(params.getP(), params.getG());
+    }
+
+    public String getAlgorithm()
+    {
+        return "ElGamal";
+    }
+
+    public String getFormat()
+    {
+        return "X.509";
+    }
+
+    public byte[] getEncoded()
+    {
+        return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(OIWObjectIdentifiers.elGamalAlgorithm, new ElGamalParameter(elSpec.getP(), elSpec.getG())), new ASN1Integer(y));
+    }
+
+    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());
+    }
+}