001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.directory.shared.kerberos.codec.checksum; 021 022 023import org.apache.directory.api.asn1.actions.CheckNotNullLength; 024import org.apache.directory.api.asn1.ber.grammar.AbstractGrammar; 025import org.apache.directory.api.asn1.ber.grammar.Grammar; 026import org.apache.directory.api.asn1.ber.grammar.GrammarTransition; 027import org.apache.directory.api.asn1.ber.tlv.UniversalTag; 028import org.apache.directory.shared.kerberos.KerberosConstants; 029import org.apache.directory.shared.kerberos.codec.checksum.actions.ChecksumInit; 030import org.apache.directory.shared.kerberos.codec.checksum.actions.StoreChecksum; 031import org.apache.directory.shared.kerberos.codec.checksum.actions.StoreCksumType; 032import org.slf4j.Logger; 033import org.slf4j.LoggerFactory; 034 035 036/** 037 * This class implements the Checksum structure. All the actions are declared 038 * in this class. As it is a singleton, these declaration are only done once. If 039 * an action is to be added or modified, this is where the work is to be done ! 040 * 041 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 042 */ 043public final class ChecksumGrammar extends AbstractGrammar<ChecksumContainer> 044{ 045 /** The logger */ 046 static final Logger LOG = LoggerFactory.getLogger( ChecksumGrammar.class ); 047 048 /** A speedup for logger */ 049 static final boolean IS_DEBUG = LOG.isDebugEnabled(); 050 051 /** The instance of grammar. ChecksumGrammar is a singleton */ 052 private static Grammar<ChecksumContainer> instance = new ChecksumGrammar(); 053 054 055 /** 056 * Creates a new ChecksumGrammar object. 057 */ 058 @SuppressWarnings("unchecked") 059 private ChecksumGrammar() 060 { 061 setName( ChecksumGrammar.class.getName() ); 062 063 // Create the transitions table 064 super.transitions = new GrammarTransition[ChecksumStatesEnum.LAST_CHECKSUM_STATE.ordinal()][256]; 065 066 // ============================================================================================ 067 // Checksum 068 // ============================================================================================ 069 // -------------------------------------------------------------------------------------------- 070 // Transition from Checksum init to Checksum SEQ OF 071 // -------------------------------------------------------------------------------------------- 072 // Checksum ::= SEQUENCE OF 073 super.transitions[ChecksumStatesEnum.START_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] = 074 new GrammarTransition<ChecksumContainer>( 075 ChecksumStatesEnum.START_STATE, 076 ChecksumStatesEnum.CHECKSUM_SEQ_STATE, 077 UniversalTag.SEQUENCE, 078 new ChecksumInit() ); 079 080 // -------------------------------------------------------------------------------------------- 081 // Transition from Checksum SEQ to checksumtype 082 // -------------------------------------------------------------------------------------------- 083 // Checksum ::= SEQUENCE { 084 // cksumtype [0] 085 super.transitions[ChecksumStatesEnum.CHECKSUM_SEQ_STATE.ordinal()][KerberosConstants.CHECKSUM_TYPE_TAG] = 086 new GrammarTransition<ChecksumContainer>( 087 ChecksumStatesEnum.CHECKSUM_SEQ_STATE, 088 ChecksumStatesEnum.CHECKSUM_TYPE_TAG_STATE, 089 KerberosConstants.CHECKSUM_TYPE_TAG, 090 new CheckNotNullLength<ChecksumContainer>() ); 091 092 // -------------------------------------------------------------------------------------------- 093 // Transition from checksumtype tag to checksumtype 094 // -------------------------------------------------------------------------------------------- 095 // Checksum ::= SEQUENCE { 096 // cksumtype [0] Int32 097 super.transitions[ChecksumStatesEnum.CHECKSUM_TYPE_TAG_STATE.ordinal()][UniversalTag.INTEGER.getValue()] = 098 new GrammarTransition<ChecksumContainer>( 099 ChecksumStatesEnum.CHECKSUM_TYPE_TAG_STATE, 100 ChecksumStatesEnum.CHECKSUM_TYPE_STATE, 101 UniversalTag.INTEGER, 102 new StoreCksumType() ); 103 104 // -------------------------------------------------------------------------------------------- 105 // Transition from checksumtype to checksum tag 106 // -------------------------------------------------------------------------------------------- 107 // Checksum ::= SEQUENCE { 108 // checksum [1] 109 super.transitions[ChecksumStatesEnum.CHECKSUM_TYPE_STATE.ordinal()][KerberosConstants.CHECKSUM_CHECKSUM_TAG] = 110 new GrammarTransition<ChecksumContainer>( 111 ChecksumStatesEnum.CHECKSUM_TYPE_STATE, 112 ChecksumStatesEnum.CHECKSUM_CHECKSUM_TAG_STATE, 113 KerberosConstants.CHECKSUM_CHECKSUM_TAG, 114 new CheckNotNullLength<ChecksumContainer>() ); 115 116 // -------------------------------------------------------------------------------------------- 117 // Transition from checksum tag to checksum value 118 // -------------------------------------------------------------------------------------------- 119 // Checksum ::= SEQUENCE { 120 // checksum [1] OCTET STRING 121 super.transitions[ChecksumStatesEnum.CHECKSUM_CHECKSUM_TAG_STATE.ordinal()][UniversalTag.OCTET_STRING 122 .getValue()] = 123 new GrammarTransition<ChecksumContainer>( 124 ChecksumStatesEnum.CHECKSUM_CHECKSUM_TAG_STATE, 125 ChecksumStatesEnum.CHECKSUM_CHECKSUM_STATE, 126 UniversalTag.OCTET_STRING, 127 new StoreChecksum() ); 128 } 129 130 131 /** 132 * Get the instance of this grammar 133 * 134 * @return An instance on the Checksum Grammar 135 */ 136 public static Grammar<ChecksumContainer> getInstance() 137 { 138 return instance; 139 } 140}