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/*
 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
 */

package sun.security.krb5.internal;

import sun.security.krb5.*;
import sun.security.util.*;
import java.util.Vector;
import java.io.IOException;
import java.math.BigInteger;

Implements the ASN.1 Authenticator type. Authenticator ::= [APPLICATION 2] SEQUENCE { authenticator-vno [0] INTEGER (5), crealm [1] Realm, cname [2] PrincipalName, cksum [3] Checksum OPTIONAL, cusec [4] Microseconds, ctime [5] KerberosTime, subkey [6] EncryptionKey OPTIONAL, seq-number [7] UInt32 OPTIONAL, authorization-data [8] AuthorizationData OPTIONAL }

This definition reflects the Network Working Group RFC 4120 specification available at http://www.ietf.org/rfc/rfc4120.txt.

/** * Implements the ASN.1 Authenticator type. * * <xmp> * Authenticator ::= [APPLICATION 2] SEQUENCE { * authenticator-vno [0] INTEGER (5), * crealm [1] Realm, * cname [2] PrincipalName, * cksum [3] Checksum OPTIONAL, * cusec [4] Microseconds, * ctime [5] KerberosTime, * subkey [6] EncryptionKey OPTIONAL, * seq-number [7] UInt32 OPTIONAL, * authorization-data [8] AuthorizationData OPTIONAL * } * </xmp> * * <p> * This definition reflects the Network Working Group RFC 4120 * specification available at * <a href="http://www.ietf.org/rfc/rfc4120.txt"> * http://www.ietf.org/rfc/rfc4120.txt</a>. */
public class Authenticator { public int authenticator_vno; public PrincipalName cname; Checksum cksum; //optional public int cusec; public KerberosTime ctime; EncryptionKey subKey; //optional Integer seqNumber; //optional public AuthorizationData authorizationData; //optional public Authenticator( PrincipalName new_cname, Checksum new_cksum, int new_cusec, KerberosTime new_ctime, EncryptionKey new_subKey, Integer new_seqNumber, AuthorizationData new_authorizationData) { authenticator_vno = Krb5.AUTHNETICATOR_VNO; cname = new_cname; cksum = new_cksum; cusec = new_cusec; ctime = new_ctime; subKey = new_subKey; seqNumber = new_seqNumber; authorizationData = new_authorizationData; } public Authenticator(byte[] data) throws Asn1Exception, IOException, KrbApErrException, RealmException { init(new DerValue(data)); } public Authenticator(DerValue encoding) throws Asn1Exception, IOException, KrbApErrException, RealmException { init(encoding); }
Initializes an Authenticator object.
Params:
  • encoding – a single DER-encoded value.
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
  • KrbApErrException – if the value read from the DER-encoded data stream does not match the pre-defined value.
  • RealmException – if an error occurs while parsing a Realm object.
/** * Initializes an Authenticator object. * @param encoding a single DER-encoded value. * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data. * @exception IOException if an I/O error occurs while reading encoded data. * @exception KrbApErrException if the value read from the DER-encoded data * stream does not match the pre-defined value. * @exception RealmException if an error occurs while parsing a Realm object. */
private void init(DerValue encoding) throws Asn1Exception, IOException, KrbApErrException, RealmException { DerValue der, subDer; //may not be the correct error code for a tag //mismatch on an encrypted structure if (((encoding.getTag() & (byte) 0x1F) != (byte) 0x02) || (encoding.isApplication() != true) || (encoding.isConstructed() != true)) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } der = encoding.getData().getDerValue(); if (der.getTag() != DerValue.tag_Sequence) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } subDer = der.getData().getDerValue(); if ((subDer.getTag() & (byte) 0x1F) != (byte) 0x00) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } authenticator_vno = subDer.getData().getBigInteger().intValue(); if (authenticator_vno != 5) { throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION); } Realm crealm = Realm.parse(der.getData(), (byte) 0x01, false); cname = PrincipalName.parse(der.getData(), (byte) 0x02, false, crealm); cksum = Checksum.parse(der.getData(), (byte) 0x03, true); subDer = der.getData().getDerValue(); if ((subDer.getTag() & (byte) 0x1F) == 0x04) { cusec = subDer.getData().getBigInteger().intValue(); } else { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } ctime = KerberosTime.parse(der.getData(), (byte) 0x05, false); if (der.getData().available() > 0) { subKey = EncryptionKey.parse(der.getData(), (byte) 0x06, true); } else { subKey = null; seqNumber = null; authorizationData = null; } if (der.getData().available() > 0) { if ((der.getData().peekByte() & 0x1F) == 0x07) { subDer = der.getData().getDerValue(); if ((subDer.getTag() & (byte) 0x1F) == (byte) 0x07) { seqNumber = new Integer(subDer.getData().getBigInteger().intValue()); } } } else { seqNumber = null; authorizationData = null; } if (der.getData().available() > 0) { authorizationData = AuthorizationData.parse(der.getData(), (byte) 0x08, true); } else { authorizationData = null; } if (der.getData().available() > 0) { throw new Asn1Exception(Krb5.ASN1_BAD_ID); } }
Encodes an Authenticator object.
Throws:
  • Asn1Exception – if an error occurs while decoding an ASN1 encoded data.
  • IOException – if an I/O error occurs while reading encoded data.
Returns:byte array of encoded Authenticator object.
/** * Encodes an Authenticator object. * @return byte array of encoded Authenticator object. * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data. * @exception IOException if an I/O error occurs while reading encoded data. */
public byte[] asn1Encode() throws Asn1Exception, IOException { Vector<DerValue> v = new Vector<>(); DerOutputStream temp = new DerOutputStream(); temp.putInteger(BigInteger.valueOf(authenticator_vno)); v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x00), temp.toByteArray())); v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x01), cname.getRealm().asn1Encode())); v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x02), cname.asn1Encode())); if (cksum != null) { v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x03), cksum.asn1Encode())); } temp = new DerOutputStream(); temp.putInteger(BigInteger.valueOf(cusec)); v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x04), temp.toByteArray())); v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x05), ctime.asn1Encode())); if (subKey != null) { v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x06), subKey.asn1Encode())); } if (seqNumber != null) { temp = new DerOutputStream(); // encode as an unsigned integer (UInt32) temp.putInteger(BigInteger.valueOf(seqNumber.longValue())); v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x07), temp.toByteArray())); } if (authorizationData != null) { v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x08), authorizationData.asn1Encode())); } DerValue der[] = new DerValue[v.size()]; v.copyInto(der); temp = new DerOutputStream(); temp.putSequence(der); DerOutputStream out = new DerOutputStream(); out.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte) 0x02), temp); return out.toByteArray(); } public final Checksum getChecksum() { return cksum; } public final Integer getSeqNumber() { return seqNumber; } public final EncryptionKey getSubKey() { return subKey; } }