112 lines
4.3 KiB
Java
112 lines
4.3 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.poifs.crypt.agile;
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import java.io.IOException;
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import org.apache.poi.EncryptedDocumentException;
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import org.apache.poi.poifs.crypt.ChainingMode;
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import org.apache.poi.poifs.crypt.CipherAlgorithm;
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import org.apache.poi.poifs.crypt.EncryptionInfo;
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import org.apache.poi.poifs.crypt.EncryptionInfoBuilder;
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import org.apache.poi.poifs.crypt.HashAlgorithm;
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import org.apache.poi.poifs.filesystem.DocumentInputStream;
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public class AgileEncryptionInfoBuilder implements EncryptionInfoBuilder {
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EncryptionInfo info;
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AgileEncryptionHeader header;
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AgileEncryptionVerifier verifier;
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AgileDecryptor decryptor;
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AgileEncryptor encryptor;
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public void initialize(EncryptionInfo info, DocumentInputStream dis) throws IOException {
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this.info = info;
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StringBuilder builder = new StringBuilder();
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byte[] xmlDescriptor = new byte[dis.available()];
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dis.read(xmlDescriptor);
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for (byte b : xmlDescriptor)
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builder.append((char)b);
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String descriptor = builder.toString();
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header = new AgileEncryptionHeader(descriptor);
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verifier = new AgileEncryptionVerifier(descriptor);
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if (info.getVersionMajor() == 4 && info.getVersionMinor() == 4) {
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decryptor = new AgileDecryptor(this);
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}
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}
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public void initialize(EncryptionInfo info, CipherAlgorithm cipherAlgorithm, HashAlgorithm hashAlgorithm, int keyBits, int blockSize, ChainingMode chainingMode) {
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this.info = info;
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if (cipherAlgorithm == null) {
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cipherAlgorithm = CipherAlgorithm.aes128;
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}
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if (cipherAlgorithm == CipherAlgorithm.rc4) {
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throw new EncryptedDocumentException("RC4 must not be used with agile encryption.");
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}
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if (hashAlgorithm == null) {
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hashAlgorithm = HashAlgorithm.sha1;
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}
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if (chainingMode == null) {
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chainingMode = ChainingMode.cbc;
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}
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if (!(chainingMode == ChainingMode.cbc || chainingMode == ChainingMode.cfb)) {
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throw new EncryptedDocumentException("Agile encryption only supports CBC/CFB chaining.");
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}
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if (keyBits == -1) {
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keyBits = cipherAlgorithm.defaultKeySize;
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}
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if (blockSize == -1) {
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blockSize = cipherAlgorithm.blockSize;
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}
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boolean found = false;
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for (int ks : cipherAlgorithm.allowedKeySize) {
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found |= (ks == keyBits);
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}
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if (!found) {
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throw new EncryptedDocumentException("KeySize "+keyBits+" not allowed for Cipher "+cipherAlgorithm.toString());
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}
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header = new AgileEncryptionHeader(cipherAlgorithm, hashAlgorithm, keyBits, blockSize, chainingMode);
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verifier = new AgileEncryptionVerifier(cipherAlgorithm, hashAlgorithm, keyBits, blockSize, chainingMode);
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decryptor = new AgileDecryptor(this);
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encryptor = new AgileEncryptor(this);
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}
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public AgileEncryptionHeader getHeader() {
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return header;
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}
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public AgileEncryptionVerifier getVerifier() {
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return verifier;
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}
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public AgileDecryptor getDecryptor() {
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return decryptor;
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}
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public AgileEncryptor getEncryptor() {
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return encryptor;
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}
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protected EncryptionInfo getInfo() {
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return info;
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}
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}
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