RSA Encryption forceclosing before generating public/private keys

Question

I am trying to generate my first public/private key pair for an RSA encryption. This is my first time doing so but through looking at various tutorials and website i've decided to do so with the following code. Although my code does not give me errors, it force closes. Everything is posted including my imports, can sombody please help me understand why my code is not generating keys and giving me errors? And yes i did declare it in the AndroidManifest.xml file

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;

    public class RSA {
        public static void GenerateKeyPair() {
            try {
                KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
                kpg.initialize(4096);
                KeyPair kp = kpg.genKeyPair();

                KeyFactory fact = KeyFactory.getInstance("RSA");
                RSAPublicKeySpec pub = fact.getKeySpec(kp.getPublic(),
                        RSAPublicKeySpec.class);
                RSAPrivateKeySpec priv = fact.getKeySpec(kp.getPrivate(),
                        RSAPrivateKeySpec.class);

                saveToFile("public.key", pub.getModulus(), pub.getPublicExponent());
                saveToFile("private.key", priv.getModulus(),
                        priv.getPrivateExponent());
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
        }

        public static void saveToFile(String fileName, BigInteger mod,
                BigInteger exp) throws Exception {
            ObjectOutputStream oout = new ObjectOutputStream(
                    new BufferedOutputStream(new FileOutputStream(fileName)));
            try {
                oout.writeObject(mod);
                oout.writeObject(exp);
            } catch (Exception e) {
                throw new Exception("error", e);
            } finally {
                oout.close();
            }
        }
    }


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.BLAH"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".UUIDActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Installation"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name=".RSA"
            android:label="@string/app_name" >
        </activity>
    </application>

</manifest>

@Obliviator Only thing i check in your question is ,you say that "yes i did declare it in the manifest" that means Have you declare this class in Manifest which is not extends as Activity then ,it will sure give you Error that you post at Last.So can you show your manifest file code and may be where your Activity class. — Herry

sastraxi sastraxi · Accepted Answer · 2012-03-24T05:13:01

I don't know what's causing your problem (we'd have to see where you use this class to debug that), but I do have an alternative for you, if you can include a 3rd party library. See JSch, which can generate RSA keypairs (e.g. for use in SSH public-key authentication). Documentation: http://epaul.github.com/jsch-documentation/simple.javadoc/

The method you're looking for is KeyPair.genKeyPair.

RSA Encryption forceclosing before generating public/private keys

2 Answers