com.itextpdf.kernel.crypto.securityhandler.StandardSecurityHandler Maven / Gradle / Ivy
/*
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Copyright (c) 1998-2023 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
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it under the terms of the GNU Affero General Public License version 3
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or FITNESS FOR A PARTICULAR PURPOSE.
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*/
package com.itextpdf.kernel.crypto.securityhandler;
import com.itextpdf.io.source.ByteUtils;
import com.itextpdf.io.util.StreamUtil;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfEncryption;
import com.itextpdf.kernel.pdf.PdfLiteral;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfNumber;
import com.itextpdf.kernel.pdf.PdfString;
public abstract class StandardSecurityHandler extends SecurityHandler {
protected static final int PERMS_MASK_1_FOR_REVISION_2 = 0xffffffc0;
protected static final int PERMS_MASK_1_FOR_REVISION_3_OR_GREATER = 0xfffff0c0;
protected static final int PERMS_MASK_2 = 0xfffffffc;
protected long permissions;
protected boolean usedOwnerPassword = true;
public long getPermissions() {
return permissions;
}
public boolean isUsedOwnerPassword() {
return usedOwnerPassword;
}
protected void setStandardHandlerDicEntries(PdfDictionary encryptionDictionary, byte[] userKey, byte[] ownerKey) {
encryptionDictionary.put(PdfName.Filter, PdfName.Standard);
encryptionDictionary.put(PdfName.O, new PdfLiteral(StreamUtil.createEscapedString(ownerKey)));
encryptionDictionary.put(PdfName.U, new PdfLiteral(StreamUtil.createEscapedString(userKey)));
encryptionDictionary.put(PdfName.P, new PdfNumber(permissions));
}
protected byte[] generateOwnerPasswordIfNullOrEmpty(byte[] ownerPassword) {
if (ownerPassword == null || ownerPassword.length == 0) {
ownerPassword = md5.digest(PdfEncryption.generateNewDocumentId());
}
return ownerPassword;
}
/**
* Gets bytes of String-value without considering encoding.
*
* @param string a {@link PdfString} to get bytes from it
* @return byte array
*/
protected byte[] getIsoBytes(PdfString string) {
return ByteUtils.getIsoBytes(string.getValue());
}
protected static boolean equalsArray(byte[] ar1, byte[] ar2, int size) {
for (int k = 0; k < size; ++k) {
if (ar1[k] != ar2[k]) {
return false;
}
}
return true;
}
}