cn.ponfee.commons.jce.implementation.ecc

类 ECPoint

java.lang.Object

cn.ponfee.commons.jce.implementation.ecc.ECPoint

public class ECPoint
extends Object

The EC point of lie on the curve

作者:

Ponfee

构造器概要

构造器

构造器和说明
ECPoint(byte[] bytes, EllipticCurve curve) Decompresses a compressed point stored in a byte-array into a new ECPoint.
ECPoint(EllipticCurve e) IMPORTANT this renders the values of x and y to be null!
ECPoint(EllipticCurve curve, BigInteger x, BigInteger y) Constructs a point on an elliptic curve.

方法概要

限定符和类型	方法和说明
ECPoint	add(ECPoint q) 在曲线上计算两点相加的第三个点：point c = point a + point b
byte[]	compress() compress the point as byte array data
void	fastCache()
EllipticCurve	getCurve()
BigInteger	getX()
BigInteger	getY()
boolean	isZero()
ECPoint	multiply(BigInteger k) 计算k倍点
String	toString()

从类继承的方法 java.lang.Object

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

构造器详细资料

ECPoint

public ECPoint(EllipticCurve curve,
               BigInteger x,
               BigInteger y)

Constructs a point on an elliptic curve.

参数:

curve - The elliptic curve on wich the point is surposed to lie

x - The x coordinate of the point

y - The y coordinate of the point

ECPoint

public ECPoint(byte[] bytes,
               EllipticCurve curve)

Decompresses a compressed point stored in a byte-array into a new ECPoint.

参数:

bytes - the array of bytes to be decompressed

curve - the EllipticCurve the decompressed point is supposed to lie on.

ECPoint

public ECPoint(EllipticCurve e)

IMPORTANT this renders the values of x and y to be null! Use this constructor only to create instances of a Zero class!

方法详细资料

fastCache

public void fastCache()

compress

public byte[] compress()

compress the point as byte array data

返回:

byte array data of this point

add

public ECPoint add(ECPoint q)

在曲线上计算两点相加的第三个点：point c = point a + point b

参数:

q - The point to be added

返回:

the sum of this point on the argument

multiply

public ECPoint multiply(BigInteger k)

计算k倍点

参数:

k -

返回:

this * k

isZero

public boolean isZero()

getX

public BigInteger getX()

getY

public BigInteger getY()

getCurve

public EllipticCurve getCurve()

toString

public String toString()

覆盖:

toString 在类中 Object