add encrypt/decrypt test

app/src/androidTest/java/org/surfsite/android/secretshare/ApplicationTest.java

@@ -3,6 +3,12 @@ package org.surfsite.android.secretshare;
 import android.app.Application;
 import android.test.ApplicationTestCase;
 
+import com.tiemens.secretshare.engine.SecretShare;
+
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
  */
@@ -10,4 +16,53 @@ public class ApplicationTest extends ApplicationTestCase<Application> {
 	public ApplicationTest() {
 		super(Application.class);
 	}
+
+	public void testEncrypt() throws Exception {
+		List<SecretShare.ShareInfo> pieces;
+		int n = 16;
+		int k = 4;
+		String cleartext
+				= "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789"
+				+ "01234567890123456789012345678901234567890123456789";
+		SecretShare.PublicInfo publicInfo;
+		SecretShare.PublicInfo pi = null;
+		List<SecretShare.ShareInfo> si = new ArrayList<SecretShare.ShareInfo>();
+
+		final BigInteger secretInteger = Renderer.stringToBigInteger(cleartext);
+		final BigInteger modulus;
+
+		modulus = SecretShare.createAppropriateModulusForSecret(secretInteger);
+		publicInfo = new SecretShare.PublicInfo(n,
+				k,
+				modulus,
+				"ssss-test");
+		final SecretShare.SplitSecretOutput splitSecretOutput = new SecretShare(publicInfo)
+				.split(secretInteger);
+		pieces = splitSecretOutput.getShareInfos();
+
+		for (int i = 0; i < pieces.size(); i++) {
+			final SecretShare.ShareInfo piece = pieces.get(i);
+
+			final String data = Renderer.encodeShareInfo(piece);
+
+			if (pi == null)
+				pi = Renderer.decodePublicInfo(data);
+
+			if (i % 4 == 0)
+				si.add(Renderer.decodeShareInfo(data, pi));
+		}
+
+		final SecretShare.CombineOutput combineOutput = new SecretShare(pi)
+				.combine(si);
+
+		assertEquals(cleartext, new String(combineOutput.getSecret().toByteArray()));
+	}
 }