1 files changed, 63 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/ServerDHParams.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/ServerDHParams.java
new file mode 100644
index 000000000..fa22e629d
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/ServerDHParams.java
@@ -0,0 +1,63 @@
+package org.spongycastle.crypto.tls;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.math.BigInteger;
+
+import org.spongycastle.crypto.params.DHParameters;
+import org.spongycastle.crypto.params.DHPublicKeyParameters;
+
+public class ServerDHParams
+{
+    protected DHPublicKeyParameters publicKey;
+
+    public ServerDHParams(DHPublicKeyParameters publicKey)
+    {
+        if (publicKey == null)
+        {
+            throw new IllegalArgumentException("'publicKey' cannot be null");
+        }
+
+        this.publicKey = publicKey;
+    }
+
+    public DHPublicKeyParameters getPublicKey()
+    {
+        return publicKey;
+    }
+
+    /**
+     * Encode this {@link ServerDHParams} to an {@link OutputStream}.
+     * 
+     * @param output
+     *            the {@link OutputStream} to encode to.
+     * @throws IOException
+     */
+    public void encode(OutputStream output) throws IOException
+    {
+        DHParameters dhParameters = publicKey.getParameters();
+        BigInteger Ys = publicKey.getY();
+
+        TlsDHUtils.writeDHParameter(dhParameters.getP(), output);
+        TlsDHUtils.writeDHParameter(dhParameters.getG(), output);
+        TlsDHUtils.writeDHParameter(Ys, output);
+    }
+
+    /**
+     * Parse a {@link ServerDHParams} from an {@link InputStream}.
+     * 
+     * @param input
+     *            the {@link InputStream} to parse from.
+     * @return a {@link ServerDHParams} object.
+     * @throws IOException
+     */
+    public static ServerDHParams parse(InputStream input) throws IOException
+    {
+        BigInteger p = TlsDHUtils.readDHParameter(input);
+        BigInteger g = TlsDHUtils.readDHParameter(input);
+        BigInteger Ys = TlsDHUtils.readDHParameter(input);
+
+        return new ServerDHParams(new DHPublicKeyParameters(Ys, new DHParameters(p, g)));
+    }
+}