com.guardtime.ksi.util.Base64 Maven / Gradle / Ivy
/*
* Copyright 2013-2018 Guardtime, Inc.
*
* This file is part of the Guardtime client SDK.
*
* 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, CONDITIONS, OR OTHER LICENSES OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
* "Guardtime" and "KSI" are trademarks or registered trademarks of
* Guardtime, Inc., and no license to trademarks is granted; Guardtime
* reserves and retains all trademark rights.
*
*/
package com.guardtime.ksi.util;
/**
* RFC 4648
* base-64 encoding/decoding.
*/
public final class Base64 {
/**
* The encoder/decoder instance.
*/
private static BaseX inst = new BaseX("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", true, '=');
/**
* Encodes the given bytes into a base-64 string.
*
* @param in
* the bytes to encode.
*
* @return The base-64 string, or null if {@code in} is null.
*/
public static String encode(byte[] in) {
if (in == null) {
return null;
}
return encode(in, 0, in.length);
}
/**
* Encodes the given bytes into a base-64 string.
*
* @param in
* an array containing the bytes to encode.
* @param off
* the start offset of the data within {@code in}.
* @param len
* the number of bytes to encode.
*
* @return The base-64 string.
*/
public static String encode(byte[] in, int off, int len) {
return inst.encode(in, off, len, null, 0).toString();
}
/**
* Decodes the given base-64 string into bytes. Any non-base-64 characters
* are silently ignored.
*
* @param in
* the base-64 string to decode.
*
* @return The decoded bytes, or null if {@code in} is null.
*/
public static byte[] decode(String in) {
if (in == null) {
return null;
}
return inst.decode(in);
}
/**
* Should not be instantiated.
*/
private Base64() {
}
}