- 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 ECPointPOINT_INFINITYThis 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-coordinatexand affine y-coordinatey.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description booleanequals(Object obj)Compares this elliptic curve point for equality with the specified object.BigIntegergetAffineX()Returns the affine x-coordinatex.BigIntegergetAffineY()Returns the affine y-coordinatey.inthashCode()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-coordinatexand affine y-coordinatey.- Parameters:
x- the affine x-coordinate.y- the affine y-coordinate.- Throws:
NullPointerException- ifxoryis 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:
equalsin classObject- Parameters:
obj- the object to be compared.- Returns:
- true if
objis 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:
hashCodein classObject- Returns:
- a hash code value.
- See Also:
Object.equals(java.lang.Object),System.identityHashCode(java.lang.Object)
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