程序包 java.security.spec

类 ECPoint

java.lang.Object

java.security.spec.ECPoint

public class ECPoint
extends Object

This immutable class represents a point on an elliptic curve (EC) in affine coordinates. Other coordinate systems can extend this class to represent this point in other coordinates.

从以下版本开始:

1.5

字段概要

字段

限定符和类型	字段	说明
static ECPoint	POINT_INFINITY	This defines the point at infinity.

构造器概要

构造器

构造器	说明
ECPoint(BigInteger x, BigInteger y)	Creates an ECPoint from the specified affine x-coordinate x and affine y-coordinate y.

方法概要

限定符和类型	方法	说明
boolean	equals(Object obj)	Compares this elliptic curve point for equality with the specified object.
BigInteger	getAffineX()	Returns the affine x-coordinate x.
BigInteger	getAffineY()	Returns the affine y-coordinate y.
int	hashCode()	Returns a hash code value for this elliptic curve point.

从类继承的方法 java.lang.Object

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

字段详细资料

POINT_INFINITY

public static final ECPoint POINT_INFINITY

This defines the point at infinity.

构造器详细资料

ECPoint

public ECPoint(BigInteger x,
               BigInteger y)

Creates an ECPoint from the specified affine x-coordinate x and affine y-coordinate y.

参数:

x - the affine x-coordinate.

y - the affine y-coordinate.

抛出:

NullPointerException - if x or y is null.

方法详细资料

getAffineX

public BigInteger getAffineX()

Returns the affine x-coordinate x. Note: POINT_INFINITY has a null affine x-coordinate.

返回:

the affine x-coordinate.

getAffineY

public BigInteger getAffineY()

Returns the affine y-coordinate y. Note: POINT_INFINITY has a null affine y-coordinate.

返回:

the affine y-coordinate.

equals

public boolean equals(Object obj)

Compares this elliptic curve point for equality with the specified object.

覆盖:

equals 在类中 Object

参数:

obj - the object to be compared.

返回:

true if obj is an instance of ECPoint and the affine coordinates match, false otherwise.

另请参阅:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Returns a hash code value for this elliptic curve point.

覆盖:

hashCode 在类中 Object

返回:

a hash code value.

另请参阅:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)