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A Java security provider for supporting ShangMi algorithms in public key infrastructure

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/*
 * 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 com.tencent.kona.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);
        }
    }
}