iaik.security.ec.math.field

Class BinaryFieldByIrreducibleFactory

java.lang.Object

iaik.security.ec.math.field.BinaryFieldByIrreducibleFactory

public final class BinaryFieldByIrreducibleFactory
extends Object

This class is a factory for generating binary finite fields for a given irreducible. In case there is an optimized implementation of a field, it automatically returns this one.

Author:

Christian Hanser

See Also:

BinaryField, BinaryFieldByBitLengthFactory

Method Summary

Modifier and Type	Method and Description
static BinaryField	getField(BigInteger irreducible) The factory method.
static BinaryField	getField(iaik.asn1.SEQUENCE encodedField) Constructs a binary field from the ASN.1 SEQUENCE:

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getField

public static BinaryField getField(iaik.asn1.SEQUENCE encodedField)

Constructs a binary field from the ASN.1 SEQUENCE:

  FieldID ::= SEQUENCE {
    fieldType   OBJECT IDENTIFIER,
    parameters  ANY DEFINED BY fieldType
  }
 

Parameters:

encodedField - the ASN.1 structure

Returns:

the binary field

getField

public static BinaryField getField(BigInteger irreducible)

The factory method. Returns a field built with the specified irreducible. Note that only low-order trinomials or pentanomials are valid.

Parameters:

irreducible - an irreducible polynomial (either a trinomial or a pentanomial)

Returns:

the binary finite field F2[X] / (irreducible)