001/* 002 * The contents of this file are subject to the terms of the Common Development and 003 * Distribution License (the License). You may not use this file except in compliance with the License. 004 * 005 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the 006 * specific language governing permission and limitations under the License. 007 * 008 * When distributing Covered Software, include this CDDL Header Notice in each file and include 009 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL 010 * Header, with the fields enclosed by brackets [] replaced by your own identifying 011 * information: "Portions copyright [year] [name of copyright owner]". 012 * 013 * Copyright 2015 ForgeRock AS. 014 */ 015 016package org.forgerock.util.encode; 017 018/** 019 * Makes use of the very fast and memory efficient Base64 class to encode and 020 * decode to and from BASE64 in full accordance with RFC 2045. And then replaces 021 * + and / for - and _ respectively and removes the padding character = to be in 022 * accordance with RFC 4648. 023 */ 024public final class Base64url { 025 /** 026 * Decodes the given Base64url encoded String into a byte array. 027 * 028 * @param content 029 * The Base64url encoded String to decode. 030 * @return The decoded byte[] array. 031 */ 032 public static byte[] decode(final String content) { 033 final StringBuilder builder = 034 new StringBuilder(content.replaceAll("-", "+").replaceAll("_", "/")); 035 final int modulus = builder.length() % 4; 036 final int numberOfPaddingChars = 4 - modulus; 037 if (modulus != 0) { 038 for (int i = 0; i < numberOfPaddingChars; i++) { 039 builder.append('='); 040 } 041 } 042 return Base64.decode(builder.toString()); 043 } 044 045 /** 046 * Encodes the given byte array into a Base64url encoded String. 047 * 048 * @param content 049 * The byte array to encode. 050 * @return The Base64url encoded byte array. 051 */ 052 public static String encode(final byte[] content) { 053 return Base64.encode(content).replaceAll("\\+", "-").replaceAll("/", "_").replaceAll("=", 054 ""); 055 } 056 057 private Base64url() { 058 // No impl. 059 } 060}