org.bouncycastle.math.ec.custom.gm

Class SM9P256V1FieldElement

java.lang.Object

org.bouncycastle.math.ec.ECFieldElement

org.bouncycastle.math.ec.ECFieldElement.AbstractFp

org.bouncycastle.math.ec.custom.gm.SM9P256V1FieldElement

All Implemented Interfaces:

ECConstants

public class SM9P256V1FieldElement
extends ECFieldElement.AbstractFp

Element of the SM9 G1 base field F_q, held in Montgomery form (see SM9P256V1Field).

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

Modifier and Type	Field and Description
static java.math.BigInteger	Q
protected int[]	x

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

EIGHT, FOUR, ONE, THREE, TWO, ZERO

Constructor Summary

Constructors

Modifier	Constructor and Description
	SM9P256V1FieldElement()
	SM9P256V1FieldElement(java.math.BigInteger x)
protected	SM9P256V1FieldElement(int[] x)

Method Summary

Modifier and Type	Method and Description
ECFieldElement	add(ECFieldElement b)
ECFieldElement	addOne()
ECFieldElement	divide(ECFieldElement b)
boolean	equals(java.lang.Object other)
java.lang.String	getFieldName()
int	getFieldSize()
int	hashCode()
ECFieldElement	invert()
boolean	isOne()
boolean	isZero()
ECFieldElement	multiply(ECFieldElement b)
ECFieldElement	negate()
ECFieldElement	sqrt() SM9 G1 uses only the uncompressed point encoding (0x04 || x || y), so square roots (needed only for compressed-point decoding) are not implemented for this internal curve.
ECFieldElement	square()
ECFieldElement	subtract(ECFieldElement b)
boolean	testBitZero()
java.math.BigInteger	toBigInteger()

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

bitLength, encodeTo, getEncoded, getEncodedLength, multiplyMinusProduct, multiplyPlusProduct, squareMinusProduct, squarePlusProduct, squarePow, toString

Methods inherited from class java.lang.Object

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

Field Detail

Q

public static final java.math.BigInteger Q

x

protected int[] x

Constructor Detail

SM9P256V1FieldElement

public SM9P256V1FieldElement(java.math.BigInteger x)

SM9P256V1FieldElement

public SM9P256V1FieldElement()

SM9P256V1FieldElement

protected SM9P256V1FieldElement(int[] x)

Method Detail

isZero

public boolean isZero()

Overrides:

isZero in class ECFieldElement

isOne

public boolean isOne()

Overrides:

isOne in class ECFieldElement

testBitZero

public boolean testBitZero()

Overrides:

testBitZero in class ECFieldElement

toBigInteger

public java.math.BigInteger toBigInteger()

Specified by:

toBigInteger in class ECFieldElement

getFieldName

public java.lang.String getFieldName()

Specified by:

getFieldName in class ECFieldElement

getFieldSize

public int getFieldSize()

Specified by:

getFieldSize in class ECFieldElement

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

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

invert

public ECFieldElement invert()

Specified by:

invert in class ECFieldElement

sqrt

public ECFieldElement sqrt()

SM9 G1 uses only the uncompressed point encoding (0x04 || x || y), so square roots (needed only for compressed-point decoding) are not implemented for this internal curve. The SM9 prime is q = 1 mod 4, which would require Tonelli-Shanks rather than the simple exponent used by SM2. Returns null (no root available).

Specified by:

sqrt in class ECFieldElement

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