/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.cxf.rs.security.jose.jwe;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.cxf.common.util.Base64UrlUtility;
import org.apache.cxf.common.util.StringUtils;
import org.apache.cxf.jaxrs.json.basic.JsonMapObjectReaderWriter;
public class JweCompactProducer {
private StringBuilder jweContentBuilder;
private String encodedEncryptedContent;
private String encodedAuthTag;
public JweCompactProducer(JweHeaders headers,
byte[] encryptedContentEncryptionKey,
byte[] cipherInitVector,
byte[] encryptedContentNoTag,
byte[] authenticationTag) {
this(getHeadersJson(headers), encryptedContentEncryptionKey,
cipherInitVector, encryptedContentNoTag, authenticationTag);
}
public JweCompactProducer(String headersJson,
byte[] encryptedContentEncryptionKey,
byte[] cipherInitVector,
byte[] encryptedContentNoTag,
byte[] authenticationTag) {
jweContentBuilder = startJweContent(new StringBuilder(), headersJson,
encryptedContentEncryptionKey, cipherInitVector);
this.encodedEncryptedContent = Base64UrlUtility.encode(encryptedContentNoTag);
this.encodedAuthTag = Base64UrlUtility.encode(authenticationTag);
}
public JweCompactProducer(JweHeaders headers,
byte[] encryptedContentEncryptionKey,
byte[] cipherInitVector,
byte[] encryptedContentWithTag,
int authTagLengthBits) {
jweContentBuilder = startJweContent(new StringBuilder(), headers,
encryptedContentEncryptionKey, cipherInitVector);
this.encodedEncryptedContent = Base64UrlUtility.encodeChunk(
encryptedContentWithTag,
0,
encryptedContentWithTag.length - authTagLengthBits / 8);
this.encodedAuthTag = Base64UrlUtility.encodeChunk(
encryptedContentWithTag,
encryptedContentWithTag.length - authTagLengthBits / 8,
authTagLengthBits / 8);
}
public static String startJweContent(JweHeaders headers,
byte[] encryptedContentEncryptionKey,
byte[] cipherInitVector) {
return startJweContent(new StringBuilder(),
headers, encryptedContentEncryptionKey, cipherInitVector).toString();
}
public static StringBuilder startJweContent(StringBuilder sb,
JweHeaders headers,
byte[] encryptedContentEncryptionKey,
byte[] cipherInitVector) {
return startJweContent(sb,
getHeadersJson(headers),
encryptedContentEncryptionKey,
cipherInitVector);
}
private static String getHeadersJson(JweHeaders headers) {
return new JsonMapObjectReaderWriter().toJson(headers);
}
public static StringBuilder startJweContent(StringBuilder sb,
String headersJson,
byte[] encryptedContentEncryptionKey,
byte[] cipherInitVector) {
String encodedHeaders = Base64UrlUtility.encode(headersJson);
String encodedContentEncryptionKey = Base64UrlUtility.encode(encryptedContentEncryptionKey);
String encodedInitVector = Base64UrlUtility.encode(cipherInitVector);
sb.append(encodedHeaders)
.append('.')
.append(encodedContentEncryptionKey == null ? "" : encodedContentEncryptionKey)
.append('.')
.append(encodedInitVector == null ? "" : encodedInitVector)
.append('.');
return sb;
}
public static void startJweContent(OutputStream os,
JweHeaders headers,
byte[] encryptedContentEncryptionKey,
byte[] cipherInitVector) throws IOException {
byte[] jsonBytes = StringUtils.toBytesUTF8(getHeadersJson(headers));
Base64UrlUtility.encodeAndStream(jsonBytes, 0, jsonBytes.length, os);
byte[] dotBytes = new byte[]{'.'};
os.write(dotBytes);
Base64UrlUtility.encodeAndStream(encryptedContentEncryptionKey, 0,
encryptedContentEncryptionKey.length, os);
os.write(dotBytes);
Base64UrlUtility.encodeAndStream(cipherInitVector, 0, cipherInitVector.length, os);
os.write(dotBytes);
os.flush();
}
public String getJweContent() {
return jweContentBuilder.append(encodedEncryptedContent)
.append('.')
.append(encodedAuthTag)
.toString();
}
}