Package org.bouncycastle.math.ec
Class ECCurve.AbstractF2m
- java.lang.Object
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- org.bouncycastle.math.ec.ECCurve
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- org.bouncycastle.math.ec.ECCurve.AbstractF2m
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- 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
public abstract static class ECCurve.AbstractF2m extends ECCurve
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Nested Class Summary
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Nested classes/interfaces inherited from class org.bouncycastle.math.ec.ECCurve
ECCurve.AbstractF2m, ECCurve.AbstractFp, ECCurve.Config, ECCurve.F2m, ECCurve.Fp
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Field Summary
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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
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Constructor Summary
Constructors Modifier Constructor Description protectedAbstractF2m(int m, int k1, int k2, int k3)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description ECPointcreatePoint(java.math.BigInteger x, java.math.BigInteger y)protected ECPointdecompressPoint(int yTilde, java.math.BigInteger X1)Decompresses a compressed point P = (xp, yp) (X9.62 s 4.2.2).static java.math.BigIntegerinverse(int m, int[] ks, java.math.BigInteger x)booleanisKoblitz()Returns true if this is a Koblitz curve (ABC curve).booleanisValidFieldElement(java.math.BigInteger x)ECFieldElementrandomFieldElement(java.security.SecureRandom r)ECFieldElementrandomFieldElementMult(java.security.SecureRandom r)protected ECFieldElementsolveQuadraticEquation(ECFieldElement beta)Solves 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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Method Detail
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inverse
public static java.math.BigInteger inverse(int m, int[] ks, java.math.BigInteger x)
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createPoint
public ECPoint createPoint(java.math.BigInteger x, java.math.BigInteger y)
- Overrides:
createPointin classECCurve
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isValidFieldElement
public boolean isValidFieldElement(java.math.BigInteger x)
- Specified by:
isValidFieldElementin classECCurve
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randomFieldElement
public ECFieldElement randomFieldElement(java.security.SecureRandom r)
- Specified by:
randomFieldElementin classECCurve
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randomFieldElementMult
public ECFieldElement randomFieldElementMult(java.security.SecureRandom r)
- Specified by:
randomFieldElementMultin classECCurve
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decompressPoint
protected ECPoint decompressPoint(int yTilde, java.math.BigInteger X1)
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
protected ECFieldElement solveQuadraticEquation(ECFieldElement beta)
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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