org.snmp4j.agent.mo.snmp.KeyChange Maven / Gradle / Ivy
/*_############################################################################
_##
_## SNMP4J-Agent 2 - KeyChange.java
_##
_## Copyright (C) 2005-2014 Frank Fock (SNMP4J.org)
_##
_## Licensed 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.snmp4j.agent.mo.snmp;
import org.snmp4j.agent.*;
import org.snmp4j.agent.mo.*;
import org.snmp4j.security.*;
import org.snmp4j.smi.*;
import org.snmp4j.agent.request.SubRequest;
import org.snmp4j.mp.SnmpConstants;
public class KeyChange extends MOMutableColumn {
public KeyChange(int columnID, MOAccess access,
OctetString defaultValue, boolean mutableInService) {
super(columnID, SMIConstants.SYNTAX_OCTET_STRING, access,
defaultValue, mutableInService);
}
public static OctetString changeKey(AuthenticationProtocol authProtocol,
OctetString oldKey,
OctetString keyChange,
int keyLength) {
byte[] random = new byte[keyLength];
byte[] delta = new byte[keyChange.length()-keyLength];
System.arraycopy(keyChange.getValue(), 0, random, 0, keyLength);
System.arraycopy(keyChange.getValue(), keyLength, delta, 0,
keyChange.length()-keyLength);
byte[] newKey = authProtocol.changeDelta(oldKey.getValue(), delta, random);
return new OctetString(newKey, random.length, newKey.length - random.length);
}
public void get(SubRequest subRequest, MOTableRow row, int column) {
if (getAccess().isAccessibleForRead()) {
subRequest.getVariableBinding().setVariable(new OctetString());
}
else {
subRequest.getStatus().setErrorStatus(SnmpConstants.SNMP_ERROR_NO_ACCESS);
}
subRequest.completed();
}
}