| /* ==================================================================== |
| 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.poi.poifs.crypt.cryptoapi; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.security.GeneralSecurityException; |
| |
| import javax.crypto.Cipher; |
| |
| import org.apache.poi.EncryptedDocumentException; |
| import org.apache.poi.util.Internal; |
| |
| /** |
| * An OutputStream for the document entries within the encrypted stream |
| */ |
| @Internal |
| /* package */ class CryptoAPIDocumentOutputStream extends ByteArrayOutputStream { |
| private final Cipher cipher; |
| private final CryptoAPIEncryptor encryptor; |
| private final byte[] oneByte = {0}; |
| |
| public CryptoAPIDocumentOutputStream(CryptoAPIEncryptor encryptor) throws GeneralSecurityException { |
| this.encryptor = encryptor; |
| cipher = encryptor.initCipherForBlock(null, 0); |
| } |
| |
| public byte[] getBuf() { |
| return buf; |
| } |
| |
| public void setSize(int count) { |
| this.count = count; |
| } |
| |
| public void setBlock(int block) throws GeneralSecurityException { |
| encryptor.initCipherForBlock(cipher, block); |
| } |
| |
| @Override |
| public synchronized void write(int b) { |
| try { |
| oneByte[0] = (byte)b; |
| cipher.update(oneByte, 0, 1, oneByte, 0); |
| super.write(oneByte); |
| } catch (Exception e) { |
| throw new EncryptedDocumentException(e); |
| } |
| } |
| |
| @Override |
| public synchronized void write(byte[] b, int off, int len) { |
| try { |
| cipher.update(b, off, len, b, off); |
| super.write(b, off, len); |
| } catch (Exception e) { |
| throw new EncryptedDocumentException(e); |
| } |
| } |
| |
| } |