Package org.bouncycastle.math.ec

## Class ECFieldElement.Fp

- java.lang.Object
- - org.bouncycastle.math.ec.ECFieldElement
  - - org.bouncycastle.math.ec.ECFieldElement.AbstractFp
    - - org.bouncycastle.math.ec.ECFieldElement.Fp

- All Implemented Interfaces:
    `ECConstants`
  Enclosing class:
    ECFieldElement

      public static class ECFieldElement.Fp
      extends ECFieldElement.AbstractFp

- - ### Nested Class Summary

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

      `ECFieldElement.AbstractF2m, ECFieldElement.AbstractFp, ECFieldElement.F2m, ECFieldElement.Fp`

  - ### Field Summary

    - ### Fields inherited from interface org.bouncycastle.math.ec.ECConstants

      `EIGHT, FOUR, ONE, THREE, TWO, ZERO`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `Fp​(java.math.BigInteger q, java.math.BigInteger x)` | Deprecated. Use ECCurve.fromBigInteger to construct field elements

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `ECFieldElement` | `add​(ECFieldElement b)` |
    `ECFieldElement` | `addOne()` |
    `ECFieldElement` | `divide​(ECFieldElement b)` |
    `boolean` | `equals​(java.lang.Object other)` |
    `java.lang.String` | `getFieldName()` | return the field name for this field.
    `int` | `getFieldSize()` |
    `java.math.BigInteger` | `getQ()` |
    `int` | `hashCode()` |
    `ECFieldElement` | `invert()` |
    `protected java.math.BigInteger` | `modAdd​(java.math.BigInteger x1, java.math.BigInteger x2)` |
    `protected java.math.BigInteger` | `modDouble​(java.math.BigInteger x)` |
    `protected java.math.BigInteger` | `modHalf​(java.math.BigInteger x)` |
    `protected java.math.BigInteger` | `modHalfAbs​(java.math.BigInteger x)` |
    `protected java.math.BigInteger` | `modInverse​(java.math.BigInteger x)` |
    `protected java.math.BigInteger` | `modMult​(java.math.BigInteger x1, java.math.BigInteger x2)` |
    `protected java.math.BigInteger` | `modReduce​(java.math.BigInteger x)` |
    `protected java.math.BigInteger` | `modSubtract​(java.math.BigInteger x1, java.math.BigInteger x2)` |
    `ECFieldElement` | `multiply​(ECFieldElement b)` |
    `ECFieldElement` | `multiplyMinusProduct​(ECFieldElement b, ECFieldElement x, ECFieldElement y)` |
    `ECFieldElement` | `multiplyPlusProduct​(ECFieldElement b, ECFieldElement x, ECFieldElement y)` |
    `ECFieldElement` | `negate()` |
    `ECFieldElement` | `sqrt()` | return a sqrt root - the routine verifies that the calculation returns the right value - if none exists it returns null.
    `ECFieldElement` | `square()` |
    `ECFieldElement` | `squareMinusProduct​(ECFieldElement x, ECFieldElement y)` |
    `ECFieldElement` | `squarePlusProduct​(ECFieldElement x, ECFieldElement y)` |
    `ECFieldElement` | `subtract​(ECFieldElement b)` |
    `java.math.BigInteger` | `toBigInteger()` |

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

      `bitLength, getEncoded, isOne, isZero, squarePow, testBitZero, toString`

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

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

- - ### Constructor Detail

    - #### Fp

          public Fp​(java.math.BigInteger q,
                    java.math.BigInteger x)

      Deprecated.
      Use ECCurve.fromBigInteger to construct field elements

  - ### Method Detail

    - #### toBigInteger

          public java.math.BigInteger toBigInteger()

      Specified by:
        `toBigInteger` in class `ECFieldElement`

    - #### getFieldName

          public java.lang.String getFieldName()

      return the field name for this field.
      Specified by:
        `getFieldName` in class `ECFieldElement`
      Returns:
        the string "Fp".

    - #### getFieldSize

          public int getFieldSize()

      Specified by:
        `getFieldSize` in class `ECFieldElement`

    - #### getQ

          public java.math.BigInteger getQ()

    - #### add

          public ECFieldElement add​(ECFieldElement b)

      Specified by:
        `add` in class `ECFieldElement`

    - #### addOne

          public ECFieldElement addOne()

      Specified by:
        `addOne` in class `ECFieldElement`

    - #### subtract

          public ECFieldElement subtract​(ECFieldElement b)

      Specified by:
        `subtract` in class `ECFieldElement`

    - #### multiply

          public ECFieldElement multiply​(ECFieldElement b)

      Specified by:
        `multiply` in class `ECFieldElement`

    - #### multiplyMinusProduct

          public ECFieldElement multiplyMinusProduct​(ECFieldElement b,
                                                     ECFieldElement x,
                                                     ECFieldElement y)

      Overrides:
        `multiplyMinusProduct` in class `ECFieldElement`

    - #### multiplyPlusProduct

          public ECFieldElement multiplyPlusProduct​(ECFieldElement b,
                                                    ECFieldElement x,
                                                    ECFieldElement y)

      Overrides:
        `multiplyPlusProduct` in class `ECFieldElement`

    - #### divide

          public ECFieldElement divide​(ECFieldElement b)

      Specified by:
        `divide` in class `ECFieldElement`

    - #### negate

          public ECFieldElement negate()

      Specified by:
        `negate` in class `ECFieldElement`

    - #### square

          public ECFieldElement square()

      Specified by:
        `square` in class `ECFieldElement`

    - #### squareMinusProduct

          public ECFieldElement squareMinusProduct​(ECFieldElement x,
                                                   ECFieldElement y)

      Overrides:
        `squareMinusProduct` in class `ECFieldElement`

    - #### squarePlusProduct

          public ECFieldElement squarePlusProduct​(ECFieldElement x,
                                                  ECFieldElement y)

      Overrides:
        `squarePlusProduct` in class `ECFieldElement`

    - #### invert

          public ECFieldElement invert()

      Specified by:
        `invert` in class `ECFieldElement`

    - #### sqrt

          public ECFieldElement sqrt()

      return a sqrt root - the routine verifies that the calculation returns the right value - if none exists it returns null.
      Specified by:
        `sqrt` in class `ECFieldElement`

    - #### modAdd

          protected java.math.BigInteger modAdd​(java.math.BigInteger x1,
                                                java.math.BigInteger x2)

    - #### modDouble

          protected java.math.BigInteger modDouble​(java.math.BigInteger x)

    - #### modHalf

          protected java.math.BigInteger modHalf​(java.math.BigInteger x)

    - #### modHalfAbs

          protected java.math.BigInteger modHalfAbs​(java.math.BigInteger x)

    - #### modInverse

          protected java.math.BigInteger modInverse​(java.math.BigInteger x)

    - #### modMult

          protected java.math.BigInteger modMult​(java.math.BigInteger x1,
                                                 java.math.BigInteger x2)

    - #### modReduce

          protected java.math.BigInteger modReduce​(java.math.BigInteger x)

    - #### modSubtract

          protected java.math.BigInteger modSubtract​(java.math.BigInteger x1,
                                                     java.math.BigInteger x2)

    - #### equals

          public boolean equals​(java.lang.Object other)

      Overrides:
        `equals` in class `java.lang.Object`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `java.lang.Object`