From ec7f222cd16f014efe32a699b47a0a45a5f0df72 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 14 Oct 2014 18:35:55 +0200
Subject: Move over AsymKeyHolder from satellite-daemon

---
 .../java/org/openslx/encryption/AsymKeyHolder.java | 123 +++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 src/main/java/org/openslx/encryption/AsymKeyHolder.java

(limited to 'src')

diff --git a/src/main/java/org/openslx/encryption/AsymKeyHolder.java b/src/main/java/org/openslx/encryption/AsymKeyHolder.java
new file mode 100644
index 0000000..6469f30
--- /dev/null
+++ b/src/main/java/org/openslx/encryption/AsymKeyHolder.java
@@ -0,0 +1,123 @@
+package org.openslx.encryption;
+
+import java.math.BigInteger;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.RSAPrivateKeySpec;
+import java.security.spec.RSAPublicKeySpec;
+
+import org.apache.log4j.Logger;
+
+public class AsymKeyHolder
+{
+	private static final Logger LOG = Logger.getLogger( AsymKeyHolder.class );
+
+	private static RSAPrivateKey privKey = null;
+	private static RSAPublicKey pubKey = null;
+
+	/**
+	 * Create private and/or public key according to given numbers.
+	 * 
+	 * @param privExp private exponent
+	 * @param pubExp public exponent
+	 * @param mod modulus of keypair
+	 * @throws NoSuchAlgorithmException
+	 * @throws InvalidKeySpecException
+	 */
+	public AsymKeyHolder( BigInteger privExp, BigInteger pubExp, BigInteger mod )
+			throws NoSuchAlgorithmException, InvalidKeySpecException
+	{
+		if ( mod == null )
+			throw new InvalidKeySpecException( "No modulus given!" );
+		final KeyFactory keyFact;
+		keyFact = KeyFactory.getInstance( "RSA" );
+		if ( pubExp != null ) {
+			RSAPublicKeySpec keySpec = new RSAPublicKeySpec( mod, pubExp );
+			pubKey = (RSAPublicKey)keyFact.generatePublic( keySpec );
+		}
+		if ( privExp != null ) {
+			RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec( mod, privExp );
+			privKey = (RSAPrivateKey)keyFact.generatePrivate( keySpec );
+		}
+	}
+
+	/**
+	 * Create new keypair.
+	 */
+	public AsymKeyHolder()
+	{
+		generateKey();
+	}
+
+	/**
+	 * Get private key or null if not known.
+	 * 
+	 * @return sausages
+	 */
+	public PrivateKey getPrivateKey()
+	{
+		return privKey;
+	}
+
+	/**
+	 * Get public key or null if not known.
+	 * 
+	 * @return public key
+	 */
+	public PublicKey getPublicKey()
+	{
+		return pubKey;
+	}
+
+	private boolean generateKey()
+	{
+		KeyPairGenerator kpg;
+		try {
+			kpg = KeyPairGenerator.getInstance( "RSA" );
+		} catch ( NoSuchAlgorithmException e ) {
+			LOG.error( "NoSuchAlgorithmException", e );
+			return false;
+		}
+
+		kpg.initialize( 4096 );
+		KeyPair kp = kpg.generateKeyPair();
+		privKey = (RSAPrivateKey)kp.getPrivate();
+		pubKey = (RSAPublicKey)kp.getPublic();
+
+		BigInteger pubMod = pubKey.getModulus();
+		BigInteger privMod = privKey.getModulus();
+		assert ( pubMod.equals( privMod ) );
+		return true;
+	}
+
+	public BigInteger getModulus()
+	{
+		if ( privKey != null )
+			return privKey.getModulus();
+		if ( pubKey != null )
+			return pubKey.getModulus();
+		return null; // Should never happen, unless only a modulus was given
+	}
+
+	public BigInteger getPrivateExponent()
+	{
+		if ( privKey == null )
+			return null;
+		return privKey.getPrivateExponent();
+	}
+
+	public BigInteger getPublicExponent()
+	{
+		if ( pubKey == null )
+			return null;
+		return pubKey.getPublicExponent();
+	}
+
+}
-- 
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