From c6cc322ab28ba55c0253c40b0774bba5a751bc35 Mon Sep 17 00:00:00 2001
From: Kenny Root <kenny@the-b.org>
Date: Sun, 14 Apr 2013 16:35:21 -0700
Subject: Split recoverKeyPair method for testing

---
 src/org/connectbot/util/PubkeyUtils.java           | 27 ++++++++++++----------
 tests/src/org/connectbot/util/PubkeyUtilsTest.java | 23 ++++++++++++++++++
 2 files changed, 38 insertions(+), 12 deletions(-)

diff --git a/src/org/connectbot/util/PubkeyUtils.java b/src/org/connectbot/util/PubkeyUtils.java
index 314624b..6e390b6 100644
--- a/src/org/connectbot/util/PubkeyUtils.java
+++ b/src/org/connectbot/util/PubkeyUtils.java
@@ -199,7 +199,8 @@ public class PubkeyUtils {
 		}
 	}
 
-	public static KeyPair recoverKeyPair(byte[] encoded) throws NoSuchAlgorithmException, InvalidKeySpecException {
+	public static KeyPair recoverKeyPair(byte[] encoded) throws NoSuchAlgorithmException,
+			InvalidKeySpecException {
 		final String algo = getAlgorithmForOid(getOidFromPkcs8Encoded(encoded));
 
 		final KeySpec privKeySpec = new PKCS8EncodedKeySpec(encoded);
@@ -207,10 +208,15 @@ public class PubkeyUtils {
 		final KeyFactory kf = KeyFactory.getInstance(algo);
 		final PrivateKey priv = kf.generatePrivate(privKeySpec);
 
-		final PublicKey pub;
+		return new KeyPair(recoverPublicKey(kf, priv), priv);
+	}
+
+	static PublicKey recoverPublicKey(KeyFactory kf, PrivateKey priv)
+			throws NoSuchAlgorithmException, InvalidKeySpecException {
 		if (priv instanceof RSAPrivateCrtKey) {
 			RSAPrivateCrtKey rsaPriv = (RSAPrivateCrtKey) priv;
-			pub = kf.generatePublic(new RSAPublicKeySpec(rsaPriv.getModulus(), rsaPriv.getPublicExponent()));
+			return kf.generatePublic(new RSAPublicKeySpec(rsaPriv.getModulus(), rsaPriv
+					.getPublicExponent()));
 		} else if (priv instanceof DSAPrivateKey) {
 			DSAPrivateKey dsaPriv = (DSAPrivateKey) priv;
 			DSAParams params = dsaPriv.getParams();
@@ -218,25 +224,22 @@ public class PubkeyUtils {
 			// Calculate public key Y
 			BigInteger y = params.getG().modPow(dsaPriv.getX(), params.getP());
 
-			pub = kf.generatePublic(new DSAPublicKeySpec(y, params.getP(), params.getQ(), params.getG()));
+			return kf.generatePublic(new DSAPublicKeySpec(y, params.getP(), params.getQ(), params
+					.getG()));
 		} else if (priv instanceof ECPrivateKey) {
 			ECPrivateKey ecPriv = (ECPrivateKey) priv;
 			ECParameterSpec params = ecPriv.getParams();
 
 			// Calculate public key Y
 			ECPoint generator = params.getGenerator();
-			BigInteger[] wCoords = EcCore.multiplyPointA(new BigInteger[] {
-																generator.getAffineX(),
-																generator.getAffineY() },
-														 ecPriv.getS(), params);
+			BigInteger[] wCoords = EcCore.multiplyPointA(new BigInteger[] { generator.getAffineX(),
+					generator.getAffineY() }, ecPriv.getS(), params);
 			ECPoint w = new ECPoint(wCoords[0], wCoords[1]);
 
-			pub = kf.generatePublic(new ECPublicKeySpec(w, params));
+			return kf.generatePublic(new ECPublicKeySpec(w, params));
 		} else {
-			throw new NoSuchAlgorithmException("Unknown algorithm: " + algo);
+			throw new NoSuchAlgorithmException("Key type must be RSA, DSA, or EC");
 		}
-
-		return new KeyPair(pub, priv);
 	}
 
 	/*
diff --git a/tests/src/org/connectbot/util/PubkeyUtilsTest.java b/tests/src/org/connectbot/util/PubkeyUtilsTest.java
index fb5bb13..1eb1ee6 100644
--- a/tests/src/org/connectbot/util/PubkeyUtilsTest.java
+++ b/tests/src/org/connectbot/util/PubkeyUtilsTest.java
@@ -20,6 +20,7 @@ package org.connectbot.util;
 import java.math.BigInteger;
 import java.security.KeyPair;
 import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
 import java.security.interfaces.DSAParams;
 import java.security.interfaces.DSAPublicKey;
 import java.security.interfaces.ECPublicKey;
@@ -319,4 +320,26 @@ public class PubkeyUtilsTest extends AndroidTestCase {
 		assertEquals(EC_KEY_pub_x, pubKey.getW().getAffineX());
 		assertEquals(EC_KEY_pub_y, pubKey.getW().getAffineY());
 	}
+
+	private static class MyPrivateKey implements PrivateKey {
+		public String getAlgorithm() {
+			throw new UnsupportedOperationException();
+		}
+
+		public byte[] getEncoded() {
+			throw new UnsupportedOperationException();
+		}
+
+		public String getFormat() {
+			throw new UnsupportedOperationException();
+		}
+	}
+
+	public void testRecoverPublicKey_FakeKey_Failure() throws Exception {
+		try {
+			PubkeyUtils.recoverPublicKey(null, new MyPrivateKey());
+			fail("Should not accept unknown key types");
+		} catch (NoSuchAlgorithmException expected) {
+		}
+	}
 }
-- 
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