ECPoint (Java Platform SE 8 ) (original) (raw)

• 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.
Since:
1.5

• • Field Summary

  Fields

  Modifier and Type	Field	Description
  static ECPoint	POINT_INFINITY	This defines the point at infinity.

  • Constructor Summary

  Constructors

  Constructor	Description
  ECPoint(BigInteger x,BigInteger y)	Creates an ECPoint from the specified affine x-coordinatex and affine y-coordinate y.

  • Method Summary

  All Methods Instance Methods Concrete Methods

  Modifier and Type	Method	Description
  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.

     * ### Methods inherited from class java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../java/lang/Object.html#clone--), [finalize](../../../java/lang/Object.html#finalize--), [getClass](../../../java/lang/Object.html#getClass--), [notify](../../../java/lang/Object.html#notify--), [notifyAll](../../../java/lang/Object.html#notifyAll--), [toString](../../../java/lang/Object.html#toString--), [wait](../../../java/lang/Object.html#wait--), [wait](../../../java/lang/Object.html#wait-long-), [wait](../../../java/lang/Object.html#wait-long-int-)`

• • Field Detail

     * #### POINT\_INFINITY  
     public static final [ECPoint](../../../java/security/spec/ECPoint.html "class in java.security.spec") POINT_INFINITY  
     This defines the point at infinity.  

  • Constructor Detail

    * #### ECPoint  
    public ECPoint([BigInteger](../../../java/math/BigInteger.html "class in java.math") x,  
                   [BigInteger](../../../java/math/BigInteger.html "class in java.math") y)  
    Creates an ECPoint from the specified affine x-coordinate`x` and affine y-coordinate `y`.  
    Parameters:  
    `x` \- the affine x-coordinate.  
    `y` \- the affine y-coordinate.  
    Throws:  
    `[NullPointerException](../../../java/lang/NullPointerException.html "class in java.lang")` \- if `x` or`y` is null.  

  • Method Detail

    * #### getAffineX  
    public [BigInteger](../../../java/math/BigInteger.html "class in java.math") getAffineX()  
    Returns the affine x-coordinate `x`. Note: POINT\_INFINITY has a null affine x-coordinate.  
    Returns:  
    the affine x-coordinate.  
    * #### getAffineY  
    public [BigInteger](../../../java/math/BigInteger.html "class in java.math") getAffineY()  
    Returns the affine y-coordinate `y`. Note: POINT\_INFINITY has a null affine y-coordinate.  
    Returns:  
    the affine y-coordinate.  
    * #### equals  
    public boolean equals([Object](../../../java/lang/Object.html "class in java.lang") obj)  
    Compares this elliptic curve point for equality with the specified object.  
    Overrides:  
    `[equals](../../../java/lang/Object.html#equals-java.lang.Object-)` in class `[Object](../../../java/lang/Object.html "class in java.lang")`  
    Parameters:  
    `obj` \- the object to be compared.  
    Returns:  
    true if `obj` is an instance of ECPoint and the affine coordinates match, false otherwise.  
    See Also:  
    [Object.hashCode()](../../../java/lang/Object.html#hashCode--), [HashMap](../../../java/util/HashMap.html "class in java.util")  
    * #### hashCode  
    public int hashCode()  
    Returns a hash code value for this elliptic curve point.  
    Overrides:  
    `[hashCode](../../../java/lang/Object.html#hashCode--)` in class `[Object](../../../java/lang/Object.html "class in java.lang")`  
    Returns:  
    a hash code value.  
    See Also:  
    [Object.equals(java.lang.Object)](../../../java/lang/Object.html#equals-java.lang.Object-), [System.identityHashCode(java.lang.Object)](../../../java/lang/System.html#identityHashCode-java.lang.Object-)

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