/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.util;

import java.io.IOException;

import java.nio.charset.StandardCharsets;

import java.util.Base64;

/**

 * The Length interface defines the length of an object

 */

public class Pem {

    /**

     * Decodes a PEM-encoded block.

     *

     * @param input the input string, according to RFC 1421, can only contain

     *              characters in the base-64 alphabet and whitespaces.

     * @return the decoded bytes

     * @throws java.io.IOException if input is invalid

     */

    public static byte[] decode(String input) throws IOException {

        byte[] src = input.replaceAll("\\s+", "")

                .getBytes(StandardCharsets.ISO_8859_1);

        try {

            return Base64.getDecoder().decode(src);

        } catch (IllegalArgumentException e) {

            throw new IOException(e);

        }

    }

}