de.flexiprovider.ec.parameters
Class CurveParams

java.lang.Object
  |
  +--de.flexiprovider.ec.parameters.CurveParams

All Implemented Interfaces:

AlgorithmParameterSpec, java.security.spec.AlgorithmParameterSpec

Direct Known Subclasses:

CurveParams.CurveParamsGF2n, CurveParams.CurveParamsGFP

public abstract class CurveParams

extends java.lang.Object

implements AlgorithmParameterSpec

This class implements EC Domain Parameters as specified in the standard IEEE P1363-D8.

Author:

Birgit Henhapl, Martin Döring

Inner Class Summary

static class	CurveParams.CurveParamsGF2n Inner class for representing char 2 curve parameters.
static class	CurveParams.CurveParamsGF2nONB Inner class for representing char 2 curve parameters.
static class	CurveParams.CurveParamsGF2nPentanomial Inner class for representing char 2 pentanomial curve parameters.
static class	CurveParams.CurveParamsGF2nTrinomial Inner class for representing char 2 trinomial curve parameters.
static class	CurveParams.CurveParamsGFP Inner class for representing prime curve parameters.

Field Summary

(package private) EllipticCurve	E elliptic curve E
(package private) Point	g basepoint G
(package private) FlexiBigInt	q size of the underlying field (either a prime or a power of two)

Constructor Summary

protected	CurveParams(Point g, FlexiBigInt r, int k) Construct new curve parameters from the given parameters.
protected	CurveParams(java.lang.String r, java.lang.String k) Construct new curve parameters from the given Strings.
protected	CurveParams(java.lang.String oid, java.lang.String r, java.lang.String k) Construct new curve parameters from the given Strings.

Method Summary

boolean	equals(java.lang.Object other) Compare these parameters with another object.
EllipticCurve	getE()
Point	getG()
int	getK()
codec.asn1.ASN1ObjectIdentifier	getOID()
FlexiBigInt	getQ()
FlexiBigInt	getR()
int	hashCode()

Methods inherited from class java.lang.Object

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

Field Detail

q

FlexiBigInt q

size of the underlying field (either a prime or a power of two)

E

EllipticCurve E

elliptic curve E

g

Point g

basepoint G

Constructor Detail

CurveParams

protected CurveParams(java.lang.String r,
                      java.lang.String k)

Construct new curve parameters from the given Strings.

Parameters:

r - order r of basepoint G

k - cofactor k

CurveParams

protected CurveParams(java.lang.String oid,
                      java.lang.String r,
                      java.lang.String k)

Construct new curve parameters from the given Strings.

Parameters:

oid - OID of the curve parameters

r - order r of basepoint G

k - cofactor k

CurveParams

protected CurveParams(Point g,
                      FlexiBigInt r,
                      int k)

Construct new curve parameters from the given parameters.

Parameters:

g - basepoint G

r - order r of basepoint G

k - cofactor k

Method Detail

getOID

public codec.asn1.ASN1ObjectIdentifier getOID()

Returns:

the OID of the curve parameters

getQ

public FlexiBigInt getQ()

Returns:

the size of the underlying field

getE

public EllipticCurve getE()

Returns:

the elliptic curve E

getG

public Point getG()

Returns:

a copy of the basepoint G

getR

public FlexiBigInt getR()

Returns:

the order r of basepoint G

getK

public int getK()

Returns:

the cofactor k

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code of these curve parameters

equals

public boolean equals(java.lang.Object other)

Compare these parameters with another object.

Overrides:

equals in class java.lang.Object

Parameters:

other - the other object

Returns:

the result of the comparison