Package org.bouncycastle.math.ec
Class ECCurve.AbstractF2m
java.lang.Object
org.bouncycastle.math.ec.ECCurve
org.bouncycastle.math.ec.ECCurve.AbstractF2m
- Direct Known Subclasses:
ECCurve.F2m,SecT113R1Curve,SecT113R2Curve,SecT131R1Curve,SecT131R2Curve,SecT163K1Curve,SecT163R1Curve,SecT163R2Curve,SecT193R1Curve,SecT193R2Curve,SecT233K1Curve,SecT233R1Curve,SecT239K1Curve,SecT283K1Curve,SecT283R1Curve,SecT409K1Curve,SecT409R1Curve,SecT571K1Curve,SecT571R1Curve
- Enclosing class:
ECCurve
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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 -
Method Summary
Modifier and TypeMethodDescriptioncreatePoint(BigInteger x, BigInteger y) protected ECPointdecompressPoint(int yTilde, BigInteger X1) Decompresses a compressed point P = (xp, yp) (X9.62 s 4.2.2).static BigIntegerinverse(int m, int[] ks, BigInteger x) booleanReturns true if this is a Koblitz curve (ABC curve).booleanprotected ECFieldElementSolves a quadratic equationz2 + z = beta(X9.62 D.1.6) The other solution isz + 1.Methods inherited from class org.bouncycastle.math.ec.ECCurve
checkPoint, checkPoints, checkPoints, cloneCurve, configure, createCacheSafeLookupTable, createDefaultMultiplier, 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
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Constructor Details
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AbstractF2m
protected AbstractF2m(int m, int k1, int k2, int k3)
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Method Details
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inverse
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createPoint
- Overrides:
createPointin classECCurve
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isValidFieldElement
- Specified by:
isValidFieldElementin classECCurve
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randomFieldElement
- Specified by:
randomFieldElementin classECCurve
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randomFieldElementMult
- Specified by:
randomFieldElementMultin classECCurve
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decompressPoint
Decompresses a compressed point P = (xp, yp) (X9.62 s 4.2.2).- Specified by:
decompressPointin classECCurve- Parameters:
yTilde- ~yp, an indication bit for the decompression of yp.X1- The field element xp.- Returns:
- the decompressed point.
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solveQuadraticEquation
Solves a quadratic equationz2 + z = beta(X9.62 D.1.6) The other solution isz + 1.- Parameters:
beta- The value to solve the quadratic equation for.- Returns:
- the solution for
z2 + z = betaornullif no solution exists.
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isKoblitz
public boolean isKoblitz()Returns true if this is a Koblitz curve (ABC curve).- Returns:
- true if this is a Koblitz curve (ABC curve), false otherwise
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