Package org.bouncycastle.math.ec

## Class ECCurve.AbstractFp

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

- Direct Known Subclasses:
    `Curve25519`, `ECCurve.Fp`, `SecP128R1Curve`, `SecP160K1Curve`, `SecP160R1Curve`, `SecP160R2Curve`, `SecP192K1Curve`, `SecP192R1Curve`, `SecP224K1Curve`, `SecP224R1Curve`, `SecP256K1Curve`, `SecP256R1Curve`, `SecP384R1Curve`, `SecP521R1Curve`, `SM2P256V1Curve`
  Enclosing class:
    ECCurve

      public abstract static class ECCurve.AbstractFp
      extends ECCurve

- - ### Nested Class Summary

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

      `ECCurve.AbstractF2m, ECCurve.AbstractFp, ECCurve.Config, ECCurve.F2m, ECCurve.Fp`

  - ### Field Summary

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

      `a, b, cofactor, coord, COORD_AFFINE, COORD_HOMOGENEOUS, COORD_JACOBIAN, COORD_JACOBIAN_CHUDNOVSKY, COORD_JACOBIAN_MODIFIED, COORD_LAMBDA_AFFINE, COORD_LAMBDA_PROJECTIVE, COORD_SKEWED, endomorphism, field, multiplier, order`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor | Description
    --- | --- | ---
    `protected` | `AbstractFp​(java.math.BigInteger q)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `protected ECPoint` | `decompressPoint​(int yTilde, java.math.BigInteger X1)` |
    `boolean` | `isValidFieldElement​(java.math.BigInteger x)` |
    `ECFieldElement` | `randomFieldElement​(java.security.SecureRandom r)` |
    `ECFieldElement` | `randomFieldElementMult​(java.security.SecureRandom r)` |

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

      `checkPoint, checkPoints, checkPoints, cloneCurve, configure, createCacheSafeLookupTable, createDefaultMultiplier, createPoint, createRawPoint, createRawPoint, decodePoint, equals, equals, fromBigInteger, getA, getAllCoordinateSystems, getB, getCofactor, getCoordinateSystem, getEndomorphism, getField, getFieldSize, getInfinity, getMultiplier, getOrder, getPreCompInfo, hashCode, importPoint, normalizeAll, normalizeAll, precompute, supportsCoordinateSystem, validatePoint`

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

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

- - ### Constructor Detail

    - #### AbstractFp

          protected AbstractFp​(java.math.BigInteger q)

  - ### Method Detail

    - #### isValidFieldElement

          public boolean isValidFieldElement​(java.math.BigInteger x)

      Specified by:
        `isValidFieldElement` in class `ECCurve`

    - #### randomFieldElement

          public ECFieldElement randomFieldElement​(java.security.SecureRandom r)

      Specified by:
        `randomFieldElement` in class `ECCurve`

    - #### randomFieldElementMult

          public ECFieldElement randomFieldElementMult​(java.security.SecureRandom r)

      Specified by:
        `randomFieldElementMult` in class `ECCurve`

    - #### decompressPoint

          protected ECPoint decompressPoint​(int yTilde,
                                            java.math.BigInteger X1)

      Specified by:
        `decompressPoint` in class `ECCurve`