org.spongycastle.pqc.math.linearalgebra

Class GF2mVector

java.lang.Object

org.spongycastle.pqc.math.linearalgebra.Vector

org.spongycastle.pqc.math.linearalgebra.GF2mVector

public class GF2mVector
extends Vector

This class implements vectors over the finite field GF(2^m) for small m (i.e., 1<m<32). It extends the abstract class Vector.

Field Summary

Fields inherited from class org.spongycastle.pqc.math.linearalgebra.Vector

length

Constructor Summary

Constructors

Constructor and Description
GF2mVector(GF2mField field, byte[] v) creates the vector over GF(2^m) of given length and with elements from array v (beginning at the first bit)
GF2mVector(GF2mField field, int[] vector) Create a new vector over GF(2m) of the given length and element array.
GF2mVector(GF2mVector other) Copy constructor.

Method Summary

Modifier and Type	Method and Description
Vector	add(Vector addend) Add another vector to this vector.
boolean	equals(java.lang.Object other) Compare this vector with another object.
byte[]	getEncoded()
GF2mField	getField()
int[]	getIntArrayForm()
int	hashCode()
boolean	isZero() Return whether this is the zero vector (i.e., all elements are zero).
Vector	multiply(Permutation p) Multiply this vector with a permutation.
java.lang.String	toString()

Methods inherited from class org.spongycastle.pqc.math.linearalgebra.Vector

getLength

Methods inherited from class java.lang.Object

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

Constructor Detail

GF2mVector

public GF2mVector(GF2mField field,
                  byte[] v)

creates the vector over GF(2^m) of given length and with elements from array v (beginning at the first bit)

Parameters:

field - finite field

v - array with elements of vector

GF2mVector

public GF2mVector(GF2mField field,
                  int[] vector)

Create a new vector over GF(2^m) of the given length and element array.

Parameters:

field - the finite field GF(2^m)

vector - the element array

GF2mVector

public GF2mVector(GF2mVector other)

Copy constructor.

Parameters:

other - another GF2mVector

Method Detail

getField

public GF2mField getField()

Returns:

the finite field this vector is defined over

getIntArrayForm

public int[] getIntArrayForm()

Returns:

int[] form of this vector

getEncoded

public byte[] getEncoded()

Specified by:

getEncoded in class Vector

Returns:

a byte array encoding of this vector

isZero

public boolean isZero()

Description copied from class: Vector

Return whether this is the zero vector (i.e., all elements are zero).

Specified by:

isZero in class Vector

Returns:

whether this is the zero vector (i.e., all elements are zero)

add

public Vector add(Vector addend)

Add another vector to this vector. Method is not yet implemented.

Specified by:

add in class Vector

Parameters:

addend - the other vector

Returns:

this + addend

Throws:

java.lang.ArithmeticException - if the other vector is not defined over the same field as this vector.

TODO: implement this method

multiply

public Vector multiply(Permutation p)

Multiply this vector with a permutation.

Specified by:

multiply in class Vector

Parameters:

p - the permutation

Returns:

this*p = p*this

equals

public boolean equals(java.lang.Object other)

Compare this vector with another object.

Specified by:

equals in class Vector

Parameters:

other - the other object

Returns:

the result of the comparison

hashCode

public int hashCode()

Specified by:

hashCode in class Vector

Returns:

the hash code of this vector

toString

public java.lang.String toString()

Specified by:

toString in class Vector

Returns:

a human readable form of this vector