org.apache.directory.shared.kerberos.components
Class Checksum

java.lang.Object
  org.apache.directory.shared.asn1.AbstractAsn1Object
      org.apache.directory.shared.kerberos.components.Checksum

All Implemented Interfaces:

org.apache.directory.shared.asn1.Asn1Object

public class Checksum
extends org.apache.directory.shared.asn1.AbstractAsn1Object

The Checksum structure is used to store a checksum associated to a type. The ASN.1 grammar is :

 Checksum        ::= SEQUENCE {
       cksumtype       [0] Int32,
       checksum        [1] OCTET STRING
 }
 

Author:

Apache Directory Project

Constructor Summary

Checksum()
Creates a new instance of Checksum.

Checksum(ChecksumType cksumtype, byte[] checksum)
Creates a new instance of Checksum.

Method Summary

int	computeLength() Compute the checksum length
ByteBuffer	encode(ByteBuffer buffer) Encode the Checksum message to a PDU.
boolean	equals(Object o)
ChecksumType	getChecksumType() Returns the ChecksumType.
byte[]	getChecksumValue() Returns the checksum value.
int	hashCode()
void	setChecksumType(ChecksumType cksumType) Set the ChecksumType.
void	setChecksumValue(byte[] checksum) Set the checksum Value.
String	toString()
String	toString(String tabs)

Methods inherited from class org.apache.directory.shared.asn1.AbstractAsn1Object

addLength, getCurrentLength, getExpectedLength, getParent, getTlvId, setCurrentLength, setExpectedLength, setParent

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Checksum

public Checksum()

Creates a new instance of Checksum.

Checksum

public Checksum(ChecksumType cksumtype,
                byte[] checksum)

Creates a new instance of Checksum.

Parameters:

cksumtype - The checksum type used

checksum - The checksum value

Method Detail

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

See Also:

Object.equals(Object)

getChecksumValue

public byte[] getChecksumValue()

Returns the checksum value.

Returns:

The checksum value.

setChecksumValue

public void setChecksumValue(byte[] checksum)

Set the checksum Value.

Parameters:

checksum - The checksum value

getChecksumType

public ChecksumType getChecksumType()

Returns the ChecksumType.

Returns:

The ChecksumType.

setChecksumType

public void setChecksumType(ChecksumType cksumType)

Set the ChecksumType.

Parameters:

cksumType - The checksum algorithm used

computeLength

public int computeLength()

Compute the checksum length

 Checksum :
 
 0x30 L1 checksum sequence
  |
  +--> 0xA0 L2 cksumtype tag
  |     |
  |     +--> 0x02 L2-1 cksumtype (int)
  |
  +--> 0xA1 L3 checksum tag
        |
        +--> 0x04 L3-1 checksum (OCTET STRING)
        
  where L1 = L2 + lenght(0xA0) + length(L2) +
             L3 + lenght(0xA1) + length(L3) 
  and
  L2 = L2-1 + length(0x02) + length( L2-1) 
  L3 = L3-1 + length(0x04) + length( L3-1) 
  

encode

public ByteBuffer encode(ByteBuffer buffer)
                  throws org.apache.directory.shared.asn1.EncoderException

Encode the Checksum message to a PDU.

 Checksum :
 
 0x30 LL
   0xA0 LL 
     0x02 0x01 cksumtype
   0xA1 LL 
     0x04 LL Checksum
 

Specified by:

encode in interface org.apache.directory.shared.asn1.Asn1Object

Overrides:

encode in class org.apache.directory.shared.asn1.AbstractAsn1Object

Parameters:

buffer - The buffer where to put the PDU. It should have been allocated before, with the right size.

Returns:

The constructed PDU.

Throws:

org.apache.directory.shared.asn1.EncoderException

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()

toString

public String toString(String tabs)

See Also:

Object.toString()