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The Apache Commons Codec package contains simple encoder and decoders for
various formats such as Base64 and Hexadecimal. In addition to these
widely used encoders and decoders, the codec package also maintains a
collection of phonetic encoding utilities.
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/* ====================================================================
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.standard;
import static org.apache.poi.poifs.crypt.CryptoFunctions.hashPassword;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.poifs.crypt.ChainingMode;
import org.apache.poi.poifs.crypt.CryptoFunctions;
import org.apache.poi.poifs.crypt.Decryptor;
import org.apache.poi.poifs.crypt.EncryptionHeader;
import org.apache.poi.poifs.crypt.EncryptionVerifier;
import org.apache.poi.poifs.crypt.HashAlgorithm;
import org.apache.poi.poifs.filesystem.DirectoryNode;
import org.apache.poi.poifs.filesystem.DocumentInputStream;
import org.apache.poi.util.BoundedInputStream;
import org.apache.poi.util.LittleEndian;
/**
*/
public class StandardDecryptor extends Decryptor implements Cloneable {
private long _length = -1;
protected StandardDecryptor() {
}
@Override
public boolean verifyPassword(String password) {
EncryptionVerifier ver = getEncryptionInfo().getVerifier();
SecretKey skey = generateSecretKey(password, ver, getKeySizeInBytes());
Cipher cipher = getCipher(skey);
try {
byte[] encryptedVerifier = ver.getEncryptedVerifier();
byte[] verifier = cipher.doFinal(encryptedVerifier);
setVerifier(verifier);
MessageDigest sha1 = CryptoFunctions.getMessageDigest(ver.getHashAlgorithm());
byte[] calcVerifierHash = sha1.digest(verifier);
byte[] encryptedVerifierHash = ver.getEncryptedVerifierHash();
byte[] decryptedVerifierHash = cipher.doFinal(encryptedVerifierHash);
// see 2.3.4.9 Password Verification (Standard Encryption)
// ... The number of bytes used by the encrypted Verifier hash MUST be 32 ...
// TODO: check and trim/pad the hashes to 32
byte[] verifierHash = Arrays.copyOf(decryptedVerifierHash, calcVerifierHash.length);
if (Arrays.equals(calcVerifierHash, verifierHash)) {
setSecretKey(skey);
return true;
} else {
return false;
}
} catch (GeneralSecurityException e) {
throw new EncryptedDocumentException(e);
}
}
protected static SecretKey generateSecretKey(String password, EncryptionVerifier ver, int keySize) {
HashAlgorithm hashAlgo = ver.getHashAlgorithm();
byte[] pwHash = hashPassword(password, hashAlgo, ver.getSalt(), ver.getSpinCount());
byte[] blockKey = new byte[4];
LittleEndian.putInt(blockKey, 0, 0);
byte[] finalHash = CryptoFunctions.generateKey(pwHash, hashAlgo, blockKey, hashAlgo.hashSize);
byte[] x1 = fillAndXor(finalHash, (byte) 0x36);
byte[] x2 = fillAndXor(finalHash, (byte) 0x5c);
byte[] x3 = new byte[x1.length + x2.length];
System.arraycopy(x1, 0, x3, 0, x1.length);
System.arraycopy(x2, 0, x3, x1.length, x2.length);
byte[] key = Arrays.copyOf(x3, keySize);
return new SecretKeySpec(key, ver.getCipherAlgorithm().jceId);
}
protected static byte[] fillAndXor(byte[] hash, byte fillByte) {
byte[] buff = new byte[64];
Arrays.fill(buff, fillByte);
for (int i=0; i