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SNMP-Agent API for Java
There is a newer version: 3.8.1
/*_############################################################################
  _## 
  _##  SNMP4J-Agent 3 - UsmKeyChange.java  
  _## 
  _##  Copyright (C) 2005-2018  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.MOAccess;
import org.snmp4j.smi.OctetString;
import org.snmp4j.agent.request.SubRequest;
import org.snmp4j.agent.mo.MOTableRow;
import org.snmp4j.security.AuthenticationProtocol;
import org.snmp4j.PDU;
import org.snmp4j.security.PrivacyProtocol;

public class UsmKeyChange extends KeyChange {

    public static final int AUTH_KEY_CHANGE = 0;
    public static final int PRIV_KEY_CHANGE = 1;

    private int type;

    public UsmKeyChange(int columnID, MOAccess access, int type) {
        super(columnID, access, new OctetString(), true);
        this.type = type;
    }

    public void prepare(SubRequest subRequest, MOTableRow row, MOTableRow changeSet, int column) {
        super.prepare(subRequest, row, changeSet, column);
        if (!subRequest.hasError()) {
            UsmMIB.UsmTableRow usmRow = (UsmMIB.UsmTableRow) row;
            int digestLength = getDigestLength(usmRow, changeSet);
            if (digestLength <= 0) {
                subRequest.completed();
                return;
            }
            OctetString v =
                    (OctetString) subRequest.getVariableBinding().getVariable();
            if (v.length() != digestLength) {
                subRequest.getStatus().setErrorStatus(PDU.wrongValue);
            }
        }
    }

    protected int getDigestLength(UsmMIB.UsmTableRow row, MOTableRow changeSet) {
        switch (type) {
            case AUTH_KEY_CHANGE: {
                AuthenticationProtocol a = row.getAuthProtocol(changeSet);
                if (a != null) {
                    return a.getDigestLength() * 2;
                }
                break;
            }
            case PRIV_KEY_CHANGE: {
                PrivacyProtocol p = row.getPrivProtocol(changeSet);
                if (p != null) {
                    return p.getMaxKeyLength() * 2;
                }
                break;
            }
        }
        return -1;
    }

    public void commit(SubRequest subRequest, MOTableRow row, MOTableRow changeSet, int column) {
        int digestLength = getDigestLength((UsmMIB.UsmTableRow) row, changeSet);
        if (digestLength > 0) {
            super.commit(subRequest, row, changeSet, column);
        } else {
            subRequest.completed();
        }
    }

}