1 files changed, 199 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/elgamal/BCElGamalPrivateKey.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/elgamal/BCElGamalPrivateKey.java
new file mode 100644
index 000000000..4f02ba3fa
--- /dev/null
+++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/elgamal/BCElGamalPrivateKey.java
@@ -0,0 +1,199 @@
+package org.spongycastle.jcajce.provider.asymmetric.elgamal;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.math.BigInteger;
+import java.util.Enumeration;
+
+import javax.crypto.interfaces.DHPrivateKey;
+import javax.crypto.spec.DHParameterSpec;
+import javax.crypto.spec.DHPrivateKeySpec;
+
+import org.spongycastle.asn1.ASN1Encodable;
+import org.spongycastle.asn1.ASN1Encoding;
+import org.spongycastle.asn1.ASN1Integer;
+import org.spongycastle.asn1.ASN1ObjectIdentifier;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.asn1.DERInteger;
+import org.spongycastle.asn1.oiw.ElGamalParameter;
+import org.spongycastle.asn1.oiw.OIWObjectIdentifiers;
+import org.spongycastle.asn1.pkcs.PrivateKeyInfo;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.crypto.params.ElGamalPrivateKeyParameters;
+import org.spongycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
+import org.spongycastle.jce.interfaces.ElGamalPrivateKey;
+import org.spongycastle.jce.interfaces.PKCS12BagAttributeCarrier;
+import org.spongycastle.jce.spec.ElGamalParameterSpec;
+import org.spongycastle.jce.spec.ElGamalPrivateKeySpec;
+
+public class BCElGamalPrivateKey
+    implements ElGamalPrivateKey, DHPrivateKey, PKCS12BagAttributeCarrier
+{
+    static final long serialVersionUID = 4819350091141529678L;
+        
+    private BigInteger      x;
+
+    private transient ElGamalParameterSpec   elSpec;
+    private transient PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
+
+    protected BCElGamalPrivateKey()
+    {
+    }
+
+    BCElGamalPrivateKey(
+        ElGamalPrivateKey key)
+    {
+        this.x = key.getX();
+        this.elSpec = key.getParameters();
+    }
+
+    BCElGamalPrivateKey(
+        DHPrivateKey key)
+    {
+        this.x = key.getX();
+        this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
+    }
+    
+    BCElGamalPrivateKey(
+        ElGamalPrivateKeySpec spec)
+    {
+        this.x = spec.getX();
+        this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG());
+    }
+
+    BCElGamalPrivateKey(
+        DHPrivateKeySpec spec)
+    {
+        this.x = spec.getX();
+        this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG());
+    }
+    
+    BCElGamalPrivateKey(
+        PrivateKeyInfo info)
+        throws IOException
+    {
+        ElGamalParameter     params = new ElGamalParameter((ASN1Sequence)info.getAlgorithmId().getParameters());
+        DERInteger      derX = ASN1Integer.getInstance(info.parsePrivateKey());
+
+        this.x = derX.getValue();
+        this.elSpec = new ElGamalParameterSpec(params.getP(), params.getG());
+    }
+
+    BCElGamalPrivateKey(
+        ElGamalPrivateKeyParameters params)
+    {
+        this.x = params.getX();
+        this.elSpec = new ElGamalParameterSpec(params.getParameters().getP(), params.getParameters().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()
+    {
+        try
+        {
+            PrivateKeyInfo          info = new PrivateKeyInfo(new AlgorithmIdentifier(OIWObjectIdentifiers.elGamalAlgorithm, new ElGamalParameter(elSpec.getP(), elSpec.getG())), new DERInteger(getX()));
+
+            return info.getEncoded(ASN1Encoding.DER);
+        }
+        catch (IOException e)
+        {
+            return null;
+        }
+    }
+
+    public ElGamalParameterSpec getParameters()
+    {
+        return elSpec;
+    }
+
+    public DHParameterSpec getParams()
+    {
+        return new DHParameterSpec(elSpec.getP(), elSpec.getG());
+    }
+    
+    public BigInteger getX()
+    {
+        return x;
+    }
+
+    public boolean equals(
+        Object o)
+    {
+        if (!(o instanceof DHPrivateKey))
+        {
+            return false;
+        }
+
+        DHPrivateKey other = (DHPrivateKey)o;
+
+        return this.getX().equals(other.getX())
+            && this.getParams().getG().equals(other.getParams().getG())
+            && this.getParams().getP().equals(other.getParams().getP())
+            && this.getParams().getL() == other.getParams().getL();
+    }
+
+    public int hashCode()
+    {
+        return this.getX().hashCode() ^ this.getParams().getG().hashCode()
+                ^ this.getParams().getP().hashCode() ^ this.getParams().getL();
+    }
+
+    private void readObject(
+        ObjectInputStream   in)
+        throws IOException, ClassNotFoundException
+    {
+        in.defaultReadObject();
+
+        this.elSpec = new ElGamalParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject());
+        this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
+    }
+
+    private void writeObject(
+        ObjectOutputStream  out)
+        throws IOException
+    {
+        out.defaultWriteObject();
+
+        out.writeObject(elSpec.getP());
+        out.writeObject(elSpec.getG());
+    }
+
+    public void setBagAttribute(
+        ASN1ObjectIdentifier oid,
+        ASN1Encodable attribute)
+    {
+        attrCarrier.setBagAttribute(oid, attribute);
+    }
+
+    public ASN1Encodable getBagAttribute(
+        ASN1ObjectIdentifier oid)
+    {
+        return attrCarrier.getBagAttribute(oid);
+    }
+
+    public Enumeration getBagAttributeKeys()
+    {
+        return attrCarrier.getBagAttributeKeys();
+    }
+}