org.bouncycastle.math.ec
Class ECCurve

java.lang.Object
  org.bouncycastle.math.ec.ECCurve

Direct Known Subclasses:

ECCurve.F2m, ECCurve.Fp

public abstract class ECCurve
extends java.lang.Object

base class for an elliptic curve

Nested Class Summary

static class	ECCurve.F2m Elliptic curves over F2m.
static class	ECCurve.Fp Elliptic curve over Fp

Constructor Summary

ECCurve()

Method Summary

abstract ECPoint	createPoint(java.math.BigInteger x, java.math.BigInteger y, boolean withCompression)
ECPoint	decodePoint(byte[] encoded) Decode a point on this curve from its ASN.1 encoding.
protected abstract ECPoint	decompressPoint(int yTilde, java.math.BigInteger X1)
abstract ECFieldElement	fromBigInteger(java.math.BigInteger x)
ECFieldElement	getA()
ECFieldElement	getB()
abstract int	getFieldSize()
abstract ECPoint	getInfinity()

Methods inherited from class java.lang.Object

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

Constructor Detail

ECCurve

public ECCurve()

Method Detail

getFieldSize

public abstract int getFieldSize()

fromBigInteger

public abstract ECFieldElement fromBigInteger(java.math.BigInteger x)

createPoint

public abstract ECPoint createPoint(java.math.BigInteger x,
                                    java.math.BigInteger y,
                                    boolean withCompression)

getInfinity

public abstract ECPoint getInfinity()

getA

public ECFieldElement getA()

getB

public ECFieldElement getB()

decompressPoint

protected abstract ECPoint decompressPoint(int yTilde,
                                           java.math.BigInteger X1)

decodePoint

public ECPoint decodePoint(byte[] encoded)

Decode a point on this curve from its ASN.1 encoding. The different encodings are taken account of, including point compression for Fp (X9.62 s 4.2.1 pg 17).

Returns:

The decoded point.