Class 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.
- Since:
- 1.5
Field Summary
Modifier and Type | Field | Description |
---|---|---|
static ECPoint | POINT_INFINITY | This defines the point at infinity. |
Constructor Summary
Constructor | Description |
---|---|
ECPoint(BigInteger x,
BigInteger y) | Creates an ECPoint from the specified affine x-coordinate |
Method Summary
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 |
BigInteger | getAffineY() | Returns the affine y-coordinate |
int | hashCode() | Returns a hash code value for this elliptic curve point. |
Methods declared in class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
Field Detail
POINT_INFINITY
public static final ECPoint POINT_INFINITY
This defines the point at infinity.
Constructor Detail
ECPoint
public ECPoint(BigInteger x, BigInteger 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
- ifx
ory
is null.
Method Detail
getAffineX
public BigInteger getAffineX()
Returns the affine x-coordinate x
. Note: POINT_INFINITY has a null affine x-coordinate.
- Returns:
- the affine x-coordinate.
getAffineY
public BigInteger 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 obj)
Compares this elliptic curve point for equality with the specified object.
- Overrides:
-
equals
in classObject
- 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()
,HashMap
hashCode
public int hashCode()
Returns a hash code value for this elliptic curve point.
- Overrides:
-
hashCode
in classObject
- Returns:
- a hash code value.
- See Also:
-
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)