--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ch/ethz/ssh2/signature/RSAPrivateKey.java	Fri Jul 18 11:21:46 2014 -0700
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2006-2013 Christian Plattner. All rights reserved.
+ * Please refer to the LICENSE.txt for licensing details.
+ */
+package ch.ethz.ssh2.signature;
+
+import java.math.BigInteger;
+import java.security.SecureRandom;
+
+/**
+ * RSAPrivateKey.
+ * 
+ * @author Christian Plattner
+ * @version 2.50, 03/15/10
+ */
+public class RSAPrivateKey
+{
+	private BigInteger d;
+	private BigInteger e;
+	private BigInteger n;
+
+	public RSAPrivateKey(BigInteger d, BigInteger e, BigInteger n)
+	{
+		this.d = d;
+		this.e = e;
+		this.n = n;
+	}
+
+	public BigInteger getD()
+	{
+		return d;
+	}
+
+	public BigInteger getE()
+	{
+		return e;
+	}
+
+	public BigInteger getN()
+	{
+		return n;
+	}
+
+	public RSAPublicKey getPublicKey()
+	{
+		return new RSAPublicKey(e, n);
+	}
+
+	/**
+	 * Generate an RSA hostkey for testing purposes only.
+	 * 
+	 * @param numbits Key length in bits
+	 * @return
+	 */
+	public static RSAPrivateKey generateKey(int numbits)
+	{
+		return generateKey(new SecureRandom(), numbits);
+	}
+
+	/**
+	 *  Generate an RSA hostkey for testing purposes only.
+	 *  
+	 * @param rnd Source for random bits
+	 * @param numbits Key length in bits
+	 * @return
+	 */
+	public static RSAPrivateKey generateKey(SecureRandom rnd, int numbits)
+	{
+		BigInteger p = BigInteger.probablePrime(numbits / 2, rnd);
+		BigInteger q = BigInteger.probablePrime(numbits / 2, rnd);
+		BigInteger phi = (p.subtract(BigInteger.ONE)).multiply(q.subtract(BigInteger.ONE));
+
+		BigInteger n = p.multiply(q);
+		BigInteger e = new BigInteger("65537");
+		BigInteger d = e.modInverse(phi);
+
+		return new RSAPrivateKey(d, e, n);
+	}
+}
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