Package org.bouncycastle.math.ec

Class ECFieldElement.Fp

java.lang.Object

org.bouncycastle.math.ec.ECFieldElement

org.bouncycastle.math.ec.ECFieldElement.Fp

All Implemented Interfaces:

ECConstants

Enclosing class:

ECFieldElement

public static class ECFieldElement.Fp
extends ECFieldElement

Nested Class Summary

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

ECFieldElement.F2m, ECFieldElement.Fp

Field Summary

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

FOUR, ONE, THREE, TWO, ZERO

Constructor Summary

Constructors

Constructor	Description
Fp(BigInteger q, BigInteger x)	Deprecated. Use ECCurve.fromBigInteger to construct field elements

Method Summary

Modifier and Type	Method	Description
ECFieldElement	add(ECFieldElement b)
ECFieldElement	addOne()
ECFieldElement	divide(ECFieldElement b)
boolean	equals(Object other)	Compares this instance with the specified object and indicates if they are equal.
String	getFieldName()	return the field name for this field.
int	getFieldSize()
BigInteger	getQ()
int	hashCode()	Returns an integer hash code for this object.
ECFieldElement	invert()
protected BigInteger	modAdd(BigInteger x1, BigInteger x2)
protected BigInteger	modDouble(BigInteger x)
protected BigInteger	modHalf(BigInteger x)
protected BigInteger	modHalfAbs(BigInteger x)
protected BigInteger	modInverse(BigInteger x)
protected BigInteger	modMult(BigInteger x1, BigInteger x2)
protected BigInteger	modReduce(BigInteger x)
protected BigInteger	modSubtract(BigInteger x1, 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)
BigInteger	toBigInteger()

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

bitLength, getEncoded, isOne, isZero, testBitZero, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Fp

public Fp(BigInteger q,
          BigInteger x)

Deprecated.

Use ECCurve.fromBigInteger to construct field elements

Method Detail

toBigInteger

public BigInteger toBigInteger()

Specified by:

toBigInteger in class ECFieldElement

getFieldName

public 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 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 BigInteger modAdd(BigInteger x1,
                            BigInteger x2)

modDouble

protected BigInteger modDouble(BigInteger x)

modHalf

protected BigInteger modHalf(BigInteger x)

modHalfAbs

protected BigInteger modHalfAbs(BigInteger x)

modInverse

protected BigInteger modInverse(BigInteger x)

modMult

protected BigInteger modMult(BigInteger x1,
                             BigInteger x2)

modReduce

protected BigInteger modReduce(BigInteger x)

modSubtract

protected BigInteger modSubtract(BigInteger x1,
                                 BigInteger x2)

equals

public boolean equals(Object other)

Description copied from class: Object

Compares this instance with the specified object and indicates if they are equal. In order to be equal, o must represent the same object as this instance using a class-specific comparison. The general contract is that this comparison should be reflexive, symmetric, and transitive. Also, no object reference other than null is equal to null.

The default implementation returns true only if this == o. See Writing a correct equals method if you intend implementing your own equals method.

The general contract for the equals and Object.hashCode() methods is that if equals returns true for any two objects, then hashCode() must return the same value for these objects. This means that subclasses of Object usually override either both methods or neither of them.

Overrides:

equals in class Object

Parameters:

other - the object to compare this instance with.

Returns:

true if the specified object is equal to this Object; false otherwise.

See Also:

Object.hashCode()

hashCode

public int hashCode()

Description copied from class: Object

Returns an integer hash code for this object. By contract, any two objects for which Object.equals(java.lang.Object) returns true must return the same hash code value. This means that subclasses of Object usually override both methods or neither method.

Note that hash values must not change over time unless information used in equals comparisons also changes.

See Writing a correct hashCode method if you intend implementing your own hashCode method.

Overrides:

hashCode in class Object

Returns:

this object's hash code.

See Also:

Object.equals(java.lang.Object)