- java.lang.Object
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- java.security.spec.ECPoint
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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
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Field Summary
Fields Modifier and Type Field Description static ECPoint
POINT_INFINITY
This defines the point at infinity.
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Constructor Summary
Constructors Constructor Description ECPoint(BigInteger x, BigInteger y)
Creates an ECPoint from the specified affine x-coordinatex
and affine y-coordinatey
.
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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-coordinatex
.BigInteger
getAffineY()
Returns the affine y-coordinatey
.int
hashCode()
Returns a hash code value for this elliptic curve point.
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Field Detail
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POINT_INFINITY
public static final ECPoint POINT_INFINITY
This defines the point at infinity.
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Constructor Detail
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ECPoint
public ECPoint(BigInteger x, BigInteger y)
Creates an ECPoint from the specified affine x-coordinatex
and affine y-coordinatey
.- Parameters:
x
- the affine x-coordinate.y
- the affine y-coordinate.- Throws:
NullPointerException
- ifx
ory
is null.
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Method Detail
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getAffineX
public BigInteger getAffineX()
Returns the affine x-coordinatex
. Note: POINT_INFINITY has a null affine x-coordinate.- Returns:
- the affine x-coordinate.
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getAffineY
public BigInteger getAffineY()
Returns the affine y-coordinatey
. Note: POINT_INFINITY has a null affine y-coordinate.- Returns:
- the affine y-coordinate.
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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
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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)
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