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Android example source code file (CertTool.java)

This example Android source code file (CertTool.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

algorithmidentifier, android, certtool, content, exception, grade, high, keypair, keypairgenerator, logtag, md5_with_rsa, medium, netscapecertrequest, pkcs12, security, string, util, utilities, utils

The CertTool.java Android example source code

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.webkit;

import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jce.netscape.NetscapeCertRequest;
import org.bouncycastle.util.encoders.Base64;

import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.security.Credentials;
import android.util.Log;

import java.security.KeyPair;
import java.security.KeyPairGenerator;

class CertTool {
    private static final String LOGTAG = "CertTool";

    private static final AlgorithmIdentifier MD5_WITH_RSA =
            new AlgorithmIdentifier(PKCSObjectIdentifiers.md5WithRSAEncryption);

    static final String CERT = Credentials.CERTIFICATE;
    static final String PKCS12 = Credentials.PKCS12;

    static String[] getKeyStrengthList() {
        return new String[] {"High Grade", "Medium Grade"};
    }

    static String getSignedPublicKey(Context context, int index, String challenge) {
        try {
            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
            generator.initialize((index == 0) ? 2048 : 1024);
            KeyPair pair = generator.genKeyPair();

            NetscapeCertRequest request = new NetscapeCertRequest(challenge,
                    MD5_WITH_RSA, pair.getPublic());
            request.sign(pair.getPrivate());
            byte[] signed = request.toASN1Object().getDEREncoded();

            Credentials.getInstance().install(context, pair);
            return new String(Base64.encode(signed));
        } catch (Exception e) {
            Log.w(LOGTAG, e);
        }
        return null;
    }

    static void addCertificate(Context context, String type, byte[] value) {
        Credentials.getInstance().install(context, type, value);
    }

    private CertTool() {}
}

Other Android examples (source code examples)

Here is a short list of links related to this Android CertTool.java source code file:

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