Class SM9P256V1Curve

java.lang.Object

org.bouncycastle.math.ec.ECCurve

org.bouncycastle.math.ec.ECCurve.AbstractFp

org.bouncycastle.math.ec.custom.gm.SM9P256V1Curve

public class SM9P256V1Curve
extends ECCurve.AbstractFp

The SM9 G1 curve E: y^2 = x^3 + 5 (a = 0) over the 256-bit Barreto-Naehrig base field F_q (GM/T 0044.5-2016), backed by the constant-time Montgomery field SM9P256V1Field. This is the same custom-curve pattern as SM2P256V1Curve but for a general (non-Solinas) prime; it is used only as the G1 of the SM9 identity-based schemes and supports uncompressed points only.

Nested Class Summary

Nested classes/interfaces inherited from class ECCurve

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

Field Summary

Fields

Modifier and Type	Field	Description
protected SM9P256V1Point	infinity
static final BigInteger	q

Fields inherited from class 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

Constructor	Description
SM9P256V1Curve()

Method Summary

Modifier and Type	Method	Description
protected ECCurve	cloneCurve()
ECLookupTable	createCacheSafeLookupTable(ECPoint[] points, int off, int len)	Create a cache-safe lookup table for the specified sequence of points.
protected ECPoint	createRawPoint(ECFieldElement x, ECFieldElement y)
protected ECPoint	createRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs)
ECFieldElement	fromBigInteger(BigInteger x)
int	getFieldSize()
ECPoint	getInfinity()
BigInteger	getQ()
boolean	supportsCoordinateSystem(int coord)

Methods inherited from class ECCurve.AbstractFp

decompressPoint, isValidFieldElement, randomFieldElement, randomFieldElementMult

Methods inherited from class ECCurve

checkPoint, checkPoints, checkPoints, configure, createDefaultMultiplier, createPoint, decodePoint, equals, equals, getA, getAffinePointEncodingLength, getAllCoordinateSystems, getB, getCofactor, getCoordinateSystem, getEndomorphism, getField, getFieldElementEncodingLength, getMultiplier, getOrder, getPreCompInfo, hashCode, importPoint, normalizeAll, normalizeAll, precompute, validatePoint

Methods inherited from class Object

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

Field Details

q

public static final BigInteger q

infinity

protected SM9P256V1Point infinity

Constructor Details

SM9P256V1Curve

public SM9P256V1Curve()

Method Details

cloneCurve

protected ECCurve cloneCurve()

Specified by:

cloneCurve in class ECCurve

supportsCoordinateSystem

public boolean supportsCoordinateSystem(int coord)

Overrides:

supportsCoordinateSystem in class ECCurve

getQ

public BigInteger getQ()

Overrides:

getQ in class ECCurve.AbstractFp

getFieldSize

public int getFieldSize()

Specified by:

getFieldSize in class ECCurve

fromBigInteger

public ECFieldElement fromBigInteger(BigInteger x)

Specified by:

fromBigInteger in class ECCurve

createRawPoint

protected ECPoint createRawPoint(ECFieldElement x,
 ECFieldElement y)

Specified by:

createRawPoint in class ECCurve

createRawPoint

protected ECPoint createRawPoint(ECFieldElement x,
 ECFieldElement y,
 ECFieldElement[] zs)

Specified by:

createRawPoint in class ECCurve

getInfinity

public ECPoint getInfinity()

Specified by:

getInfinity in class ECCurve

createCacheSafeLookupTable

public ECLookupTable createCacheSafeLookupTable(ECPoint[] points,
 int off,
 int len)

Description copied from class: ECCurve

Create a cache-safe lookup table for the specified sequence of points. All the points MUST belong to this ECCurve instance, and MUST already be normalized.

Overrides:

createCacheSafeLookupTable in class ECCurve