@Override
public ISecurityHandler getSecurityHandler(COSEncryption encryption) throws COSSecurityException {
COSName name = encryption.getFilter();
if (name == null) {
throw new COSSecurityException("security handler not specified"); // $NON-NLS-1$
}
if (name.equals(CN_Standard)) {
int revision = encryption.getFieldInt(DK_R, 0);
if (revision == 2) {
return new StandardSecurityHandlerR2();
} else if (revision == 3) {
return new StandardSecurityHandlerR3();
} else if (revision == 4) {
return new StandardSecurityHandlerR4();
} else {
return new StandardSecurityHandlerR2();
}
}
// maybe provide a registry some day
throw new COSSecurityException(
"no security handler '" //$NON-NLS-1$
+ name.stringValue()
+ "'"); //$NON-NLS-1$
}
@Override
public void detach(STDocument doc) throws COSSecurityException {
if (doc == null) {
return;
}
COSEncryption encryption = getEncryption();
encryption.cosRemoveField(COSEncryption.DK_Filter);
encryption.cosRemoveField(StandardSecurityHandler.DK_R);
encryption.cosRemoveField(StandardSecurityHandler.DK_P);
super.detach(doc);
}
@Override
public void attach(STDocument doc) {
super.attach(doc);
if (doc == null) {
return;
}
COSEncryption encryption = getEncryption();
encryption.cosSetField(COSEncryption.DK_Filter, StandardSecurityHandlerFactory.CN_Standard);
encryption.cosSetField(StandardSecurityHandler.DK_R, COSInteger.create(getRevision()));
// apply default permissions
getEncryption().setFieldInt(StandardSecurityHandler.DK_P, DEFAULT_ACCESS_PERMISSIONS);
}
@Override
protected void initializeFromScratch() {
super.initializeFromScratch();
COSEncryption encryption = getEncryption();
encryption.setFieldInt(COSEncryption.DK_Length, DEFAULT_LENGTH);
}
public void setLength(int length) {
COSEncryption encryption = getEncryption();
encryption.setFieldInt(COSEncryption.DK_Length, length);
}
protected void initializeFromScratch() {
COSEncryption encryption = getEncryption();
encryption.cosSetField(COSEncryption.DK_V, COSInteger.create(getVersion()));
}
public int getLength() {
COSEncryption encryption = getEncryption();
return encryption.getFieldInt(COSEncryption.DK_Length, DEFAULT_LENGTH);
}