org.apache.commons.ssl.org.bouncycastle.asn1.ua

Class DSTU4145PointEncoder

java.lang.Object

org.apache.commons.ssl.org.bouncycastle.asn1.ua.DSTU4145PointEncoder

public abstract class DSTU4145PointEncoder
extends Object

DSTU4145 encodes points somewhat differently than X9.62 It compresses the point to the size of the field element

Constructor Summary

Constructors

Constructor and Description
DSTU4145PointEncoder()

Method Summary

Modifier and Type	Method and Description
static org.bouncycastle.math.ec.ECPoint	decodePoint(org.bouncycastle.math.ec.ECCurve curve, byte[] bytes)
static byte[]	encodePoint(org.bouncycastle.math.ec.ECPoint Q)
private static org.bouncycastle.math.ec.ECFieldElement	solveQuadraticEquation(org.bouncycastle.math.ec.ECCurve curve, org.bouncycastle.math.ec.ECFieldElement beta) Solves a quadratic equation z2 + z = beta(X9.62 D.1.6) The other solution is z + 1.
private static org.bouncycastle.math.ec.ECFieldElement	trace(org.bouncycastle.math.ec.ECFieldElement fe)

Methods inherited from class java.lang.Object

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

Constructor Detail

DSTU4145PointEncoder

public DSTU4145PointEncoder()

Method Detail

trace

private static org.bouncycastle.math.ec.ECFieldElement trace(org.bouncycastle.math.ec.ECFieldElement fe)

solveQuadraticEquation

private static org.bouncycastle.math.ec.ECFieldElement solveQuadraticEquation(org.bouncycastle.math.ec.ECCurve curve,
                                                                              org.bouncycastle.math.ec.ECFieldElement beta)

Solves a quadratic equation z2 + z = beta(X9.62 D.1.6) The other solution is z + 1.

Parameters:

beta - The value to solve the quadratic equation for.

Returns:

the solution for z2 + z = beta or null if no solution exists.

encodePoint

public static byte[] encodePoint(org.bouncycastle.math.ec.ECPoint Q)

decodePoint

public static org.bouncycastle.math.ec.ECPoint decodePoint(org.bouncycastle.math.ec.ECCurve curve,
                                                           byte[] bytes)