/* ==================================================================== | |
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.IOException; | |
import org.apache.poi.poifs.crypt.*; | |
import org.apache.poi.util.LittleEndianInput; | |
public class CryptoAPIEncryptionInfoBuilder implements EncryptionInfoBuilder { | |
public CryptoAPIEncryptionInfoBuilder() { | |
} | |
/** | |
* initialize the builder from a stream | |
*/ | |
@Override | |
public void initialize(EncryptionInfo info, LittleEndianInput dis) | |
throws IOException { | |
/* int hSize = */ dis.readInt(); | |
CryptoAPIEncryptionHeader header = new CryptoAPIEncryptionHeader(dis); | |
info.setHeader(header); | |
info.setVerifier(new CryptoAPIEncryptionVerifier(dis, header)); | |
CryptoAPIDecryptor dec = new CryptoAPIDecryptor(); | |
dec.setEncryptionInfo(info); | |
info.setDecryptor(dec); | |
CryptoAPIEncryptor enc = new CryptoAPIEncryptor(); | |
enc.setEncryptionInfo(info); | |
info.setEncryptor(enc); | |
} | |
/** | |
* initialize the builder from scratch | |
*/ | |
@Override | |
public void initialize(EncryptionInfo info, | |
CipherAlgorithm cipherAlgorithm, HashAlgorithm hashAlgorithm, | |
int keyBits, int blockSize, ChainingMode chainingMode) { | |
if (cipherAlgorithm == null) { | |
cipherAlgorithm = CipherAlgorithm.rc4; | |
} | |
if (hashAlgorithm == null) { | |
hashAlgorithm = HashAlgorithm.sha1; | |
} | |
if (keyBits == -1) { | |
keyBits = 0x28; | |
} | |
assert(cipherAlgorithm == CipherAlgorithm.rc4 && hashAlgorithm == HashAlgorithm.sha1); | |
info.setHeader(new CryptoAPIEncryptionHeader(cipherAlgorithm, hashAlgorithm, keyBits, blockSize, chainingMode)); | |
info.setVerifier(new CryptoAPIEncryptionVerifier(cipherAlgorithm, hashAlgorithm, keyBits, blockSize, chainingMode)); | |
CryptoAPIDecryptor dec = new CryptoAPIDecryptor(); | |
dec.setEncryptionInfo(info); | |
info.setDecryptor(dec); | |
CryptoAPIEncryptor enc = new CryptoAPIEncryptor(); | |
enc.setEncryptionInfo(info); | |
info.setEncryptor(enc); | |
} | |
} |