Package org.bouncycastle.math.ec

## Class ECPoint.AbstractFp

- java.lang.Object
- - org.bouncycastle.math.ec.ECPoint
  - - org.bouncycastle.math.ec.ECPoint.AbstractFp

- Direct Known Subclasses:
    `Curve25519Point`, `ECPoint.Fp`, `SecP128R1Point`, `SecP160K1Point`, `SecP160R1Point`, `SecP160R2Point`, `SecP192K1Point`, `SecP192R1Point`, `SecP224K1Point`, `SecP224R1Point`, `SecP256K1Point`, `SecP256R1Point`, `SecP384R1Point`, `SecP521R1Point`, `SM2P256V1Point`
  Enclosing class:
    ECPoint

      public abstract static class ECPoint.AbstractFp
      extends ECPoint

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.bouncycastle.math.ec.ECPoint

      `ECPoint.AbstractF2m, ECPoint.AbstractFp, ECPoint.F2m, ECPoint.Fp`

  - ### Field Summary

    - ### Fields inherited from class org.bouncycastle.math.ec.ECPoint

      `curve, EMPTY_ZS, preCompTable, x, y, zs`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor | Description
    --- | --- | ---
    `protected` | `AbstractFp​(ECCurve curve, ECFieldElement x, ECFieldElement y)` |
    `protected` | `AbstractFp​(ECCurve curve, ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `protected boolean` | `getCompressionYTilde()` |
    `protected boolean` | `satisfiesCurveEquation()` |
    `ECPoint` | `subtract​(ECPoint b)` |

    - ### Methods inherited from class org.bouncycastle.math.ec.ECPoint

      `add, checkNormalized, createScaledPoint, detach, equals, equals, getAffineXCoord, getAffineYCoord, getCurve, getCurveCoordinateSystem, getDetachedPoint, getEncoded, getEncoded, getInitialZCoords, getRawXCoord, getRawYCoord, getRawZCoords, getXCoord, getYCoord, getZCoord, getZCoords, hashCode, isInfinity, isNormalized, isValid, multiply, negate, normalize, satisfiesOrder, scaleX, scaleXNegateY, scaleY, scaleYNegateX, threeTimes, timesPow2, toString, twice, twicePlus`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### AbstractFp

          protected AbstractFp​(ECCurve curve,
                               ECFieldElement x,
                               ECFieldElement y)

    - #### AbstractFp

          protected AbstractFp​(ECCurve curve,
                               ECFieldElement x,
                               ECFieldElement y,
                               ECFieldElement[] zs)

  - ### Method Detail

    - #### getCompressionYTilde

          protected boolean getCompressionYTilde()

      Specified by:
        `getCompressionYTilde` in class `ECPoint`

    - #### satisfiesCurveEquation

          protected boolean satisfiesCurveEquation()

      Specified by:
        `satisfiesCurveEquation` in class `ECPoint`

    - #### subtract

          public ECPoint subtract​(ECPoint b)

      Specified by:
        `subtract` in class `ECPoint`