org.apache.poi.poifs.crypt.agile.AgileEncryptionVerifier Maven / Gradle / Ivy
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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
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http://www.apache.org/licenses/LICENSE-2.0
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See the License for the specific language governing permissions and
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package org.apache.poi.poifs.crypt.agile;
import java.io.ByteArrayInputStream;
import java.security.GeneralSecurityException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.poifs.crypt.ChainingMode;
import org.apache.poi.poifs.crypt.CipherAlgorithm;
import org.apache.poi.poifs.crypt.EncryptionVerifier;
import org.apache.poi.poifs.crypt.HashAlgorithm;
import com.microsoft.schemas.office.x2006.encryption.CTKeyEncryptor;
import com.microsoft.schemas.office.x2006.encryption.EncryptionDocument;
import com.microsoft.schemas.office.x2006.encryption.STCipherChaining;
import com.microsoft.schemas.office.x2006.keyEncryptor.certificate.CTCertificateKeyEncryptor;
import com.microsoft.schemas.office.x2006.keyEncryptor.password.CTPasswordKeyEncryptor;
/**
* Used when checking if a key is valid for a document
*/
public class AgileEncryptionVerifier extends EncryptionVerifier {
public static class AgileCertificateEntry {
X509Certificate x509;
byte encryptedKey[];
byte certVerifier[];
}
private List certList = new ArrayList();
public AgileEncryptionVerifier(String descriptor) {
this(AgileEncryptionInfoBuilder.parseDescriptor(descriptor));
}
protected AgileEncryptionVerifier(EncryptionDocument ed) {
Iterator encList = ed.getEncryption().getKeyEncryptors().getKeyEncryptorList().iterator();
CTPasswordKeyEncryptor keyData;
try {
keyData = encList.next().getEncryptedPasswordKey();
if (keyData == null) {
throw new NullPointerException("encryptedKey not set");
}
} catch (Exception e) {
throw new EncryptedDocumentException("Unable to parse keyData", e);
}
int keyBits = (int)keyData.getKeyBits();
CipherAlgorithm ca = CipherAlgorithm.fromXmlId(keyData.getCipherAlgorithm().toString(), keyBits);
setCipherAlgorithm(ca);
int hashSize = keyData.getHashSize();
HashAlgorithm ha = HashAlgorithm.fromEcmaId(keyData.getHashAlgorithm().toString());
setHashAlgorithm(ha);
if (getHashAlgorithm().hashSize != hashSize) {
throw new EncryptedDocumentException("Unsupported hash algorithm: " +
keyData.getHashAlgorithm() + " @ " + hashSize + " bytes");
}
setSpinCount(keyData.getSpinCount());
setEncryptedVerifier(keyData.getEncryptedVerifierHashInput());
setSalt(keyData.getSaltValue());
setEncryptedKey(keyData.getEncryptedKeyValue());
setEncryptedVerifierHash(keyData.getEncryptedVerifierHashValue());
int saltSize = keyData.getSaltSize();
if (saltSize != getSalt().length)
throw new EncryptedDocumentException("Invalid salt size");
switch (keyData.getCipherChaining().intValue()) {
case STCipherChaining.INT_CHAINING_MODE_CBC:
setChainingMode(ChainingMode.cbc);
break;
case STCipherChaining.INT_CHAINING_MODE_CFB:
setChainingMode(ChainingMode.cfb);
break;
default:
throw new EncryptedDocumentException("Unsupported chaining mode - "+keyData.getCipherChaining().toString());
}
if (!encList.hasNext()) return;
try {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
while (encList.hasNext()) {
CTCertificateKeyEncryptor certKey = encList.next().getEncryptedCertificateKey();
AgileCertificateEntry ace = new AgileCertificateEntry();
ace.certVerifier = certKey.getCertVerifier();
ace.encryptedKey = certKey.getEncryptedKeyValue();
ace.x509 = (X509Certificate)cf.generateCertificate(new ByteArrayInputStream(certKey.getX509Certificate()));
certList.add(ace);
}
} catch (GeneralSecurityException e) {
throw new EncryptedDocumentException("can't parse X509 certificate", e);
}
}
public AgileEncryptionVerifier(CipherAlgorithm cipherAlgorithm, HashAlgorithm hashAlgorithm, int keyBits, int blockSize, ChainingMode chainingMode) {
setCipherAlgorithm(cipherAlgorithm);
setHashAlgorithm(hashAlgorithm);
setChainingMode(chainingMode);
setSpinCount(100000); // TODO: use parameter
}
protected void setSalt(byte salt[]) {
if (salt == null || salt.length != getCipherAlgorithm().blockSize) {
throw new EncryptedDocumentException("invalid verifier salt");
}
super.setSalt(salt);
}
// make method visible for this package
protected void setEncryptedVerifier(byte encryptedVerifier[]) {
super.setEncryptedVerifier(encryptedVerifier);
}
// make method visible for this package
protected void setEncryptedVerifierHash(byte encryptedVerifierHash[]) {
super.setEncryptedVerifierHash(encryptedVerifierHash);
}
// make method visible for this package
protected void setEncryptedKey(byte[] encryptedKey) {
super.setEncryptedKey(encryptedKey);
}
public void addCertificate(X509Certificate x509) {
AgileCertificateEntry ace = new AgileCertificateEntry();
ace.x509 = x509;
certList.add(ace);
}
public List getCertificates() {
return certList;
}
}