Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2016 OpenMarket Ltd
 *
 * 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.
 */

import java.security.MessageDigest;

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class Main {
    /**
     * Generates the SHA-256 fingerprint of the given certificate
     * @param cert the certificate.
     * @return the finger print
     */
    public static byte[] generateSha256Fingerprint(X509Certificate cert) throws CertificateException {
        return generateFingerprint(cert, "SHA-256");
    }

    /**
     * Generate the fingerprint for a dedicated type.
     * @param cert the certificate
     * @param type the type
     * @return the fingerprint
     * @throws CertificateException
     */
    private static byte[] generateFingerprint(X509Certificate cert, String type) throws CertificateException {
        final byte[] fingerprint;
        final MessageDigest md;
        try {
            md = MessageDigest.getInstance(type);
        } catch (Exception e) {
            // This really *really* shouldn't throw, as java should always have a SHA-256 and SHA-1 impl.
            throw new CertificateException(e);
        }

        fingerprint = md.digest(cert.getEncoded());

        return fingerprint;
    }
}