de.flexiprovider.ec.asn1
Class CharacteristicTwoField

java.lang.Object
  |
  +--java.util.AbstractCollection
        |
        +--java.util.AbstractList
              |
              +--java.util.ArrayList
                    |
                    +--codec.asn1.ASN1AbstractCollection
                          |
                          +--codec.asn1.ASN1Sequence
                                |
                                +--de.flexiprovider.ec.asn1.CharacteristicTwoField

All Implemented Interfaces:

codec.asn1.ASN1Collection, codec.asn1.ASN1Type, java.lang.Cloneable, java.util.Collection, java.io.Externalizable, java.util.List, java.io.Serializable

public class CharacteristicTwoField

extends codec.asn1.ASN1Sequence

This class represents a characterisitic-two-field as defined in ANS X9.62 - 1998. The ASN.1 definition of this structure is

   characteristic-two-field::= SEQUENCE{
                  m             Integer,
                  basis         ObjectIdentifier,
                  parameters    OpenType
                  }
 

Author:

Michele Boivin, Martin Döring

See Also:

Serialized Form

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

CharacteristicTwoField()
Constructor used for decoding.

CharacteristicTwoField(int n)
Constructor for a Gaussian basis representation.

CharacteristicTwoField(int n, int tc)
Constructor for trinomial basis representation.

CharacteristicTwoField(int n, int pc1, int pc2, int pc3)
Constructor for pentanomial basis representation.

Method Summary

int	getN()
PpBasis	getPenta()
TpBasis	getTrinom()
boolean	isONB()
boolean	isPentanomial()
boolean	isTrinomial()

Methods inherited from class codec.asn1.ASN1Sequence

getTag

Methods inherited from class codec.asn1.ASN1AbstractCollection

checkConstraints, decode, encode, getCollection, getConstraint, getTagClass, getValue, isExplicit, isOptional, isType, readExternal, setConstraint, setExplicit, setOptional, toString, writeExternal

Methods inherited from class java.util.ArrayList

add, add, addAll, addAll, clear, clone, contains, ensureCapacity, get, indexOf, isEmpty, lastIndexOf, remove, removeRange, set, size, toArray, toArray, trimToSize

Methods inherited from class java.util.AbstractList

equals, hashCode, iterator, listIterator, listIterator, subList

Methods inherited from class java.util.AbstractCollection

containsAll, remove, removeAll, retainAll

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray

Methods inherited from interface java.util.List

containsAll, equals, hashCode, iterator, listIterator, listIterator, remove, removeAll, retainAll, subList

Constructor Detail

CharacteristicTwoField

public CharacteristicTwoField()

Constructor used for decoding.

CharacteristicTwoField

public CharacteristicTwoField(int n)

Constructor for a Gaussian basis representation.

Parameters:

n - the extension degree of the finite field GF(2^n)

CharacteristicTwoField

public CharacteristicTwoField(int n,
                              int tc)

Constructor for trinomial basis representation. The field polynomial is of the form x^n + x^tc + 1.

Parameters:

n - the extension degree of the finite field GF(2^n)

tc - the value for trinomial basis representation

CharacteristicTwoField

public CharacteristicTwoField(int n,
                              int pc1,
                              int pc2,
                              int pc3)

Constructor for pentanomial basis representation. The field polynomial is of the form x^n + x^pc3 + x^pc2 + x^pc1 + 1.

Parameters:

n - the extension degree of the finite field GF(2^n)

pc1 - the first value for pentanomial basis representation

pc2 - the second value for pentanomial basis representation

pc3 - the thrid value for pentanomial basis representation

Method Detail

isONB

public boolean isONB()

Returns:

whether this field uses Gaussian basis representation

isTrinomial

public boolean isTrinomial()

Returns:

whether this field uses trinomial basis representation

isPentanomial

public boolean isPentanomial()

Returns:

whether this field uses pentanomial basis representation

getN

public int getN()

Returns:

the extension degree of the finite field GF(2^n)

getTrinom

public TpBasis getTrinom()

Returns:

the trinomial basis

getPenta

public PpBasis getPenta()

Returns:

the pentanomial basis