org.bouncycastle.math.ec.ECCurve.getB()方法的使用及代码示例

x33g5p2x  于2022-01-19 转载在 其他  
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本文整理了Java中org.bouncycastle.math.ec.ECCurve.getB()方法的一些代码示例，展示了ECCurve.getB()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ECCurve.getB()方法的具体详情如下：
包路径：org.bouncycastle.math.ec.ECCurve
类名称：ECCurve
方法名：getB

ECCurve.getB介绍

暂无

代码示例

代码示例来源：origin: stackoverflow.com

ECCurve curve = //...
ECFieldElement x = //...
ECFieldElement y = //...

ECFieldElement a = curve.getA();
ECFieldElement b = curve.getB();
ECFieldElement lhs = y.multiply(y);
ECFieldElement rhs = x.multiply(x).multiply(x).add(a.multiply(x)).add(b);

boolean pointIsOnCurve = lhs.equals(rhs);

代码示例来源：origin: org.xipki/security

public static boolean isSm2primev2Curve(ECCurve curve) {
 return curve.getB().toBigInteger().equals(sm2primev2CurveA);
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public boolean equals(ECCurve other)
{
  return this == other
    || (null != other
      && getField().equals(other.getField())
      && getA().toBigInteger().equals(other.getA().toBigInteger())
      && getB().toBigInteger().equals(other.getB().toBigInteger()));
}

代码示例来源：origin: redfish64/TinyTravelTracker

public boolean equals(ECCurve other)
{
  return this == other
    || (null != other
      && getField().equals(other.getField())
      && getA().toBigInteger().equals(other.getA().toBigInteger())
      && getB().toBigInteger().equals(other.getB().toBigInteger()));
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public int hashCode() 
{
  return getField().hashCode()
    ^ Integers.rotateLeft(getA().toBigInteger().hashCode(), 8)
    ^ Integers.rotateLeft(getB().toBigInteger().hashCode(), 16);
}

代码示例来源：origin: redfish64/TinyTravelTracker

public int hashCode() 
{
  return getField().hashCode()
    ^ Integers.rotateLeft(getA().toBigInteger().hashCode(), 8)
    ^ Integers.rotateLeft(getB().toBigInteger().hashCode(), 16);
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

private static EllipticCurve convertCurve(
  ECCurve  curve,
  byte[]   seed)
{
  ECField field = convertField(curve.getField());
  BigInteger a = curve.getA().toBigInteger(), b = curve.getB().toBigInteger();
  return new EllipticCurve(field, a, b, seed);
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public static EllipticCurve convertCurve(
  ECCurve curve, 
  byte[]  seed)
{
  ECField field = convertField(curve.getField());
  BigInteger a = curve.getA().toBigInteger(), b = curve.getB().toBigInteger();
  // TODO: the Sun EC implementation doesn't currently handle the seed properly
  // so at the moment it's set to null. Should probably look at making this configurable
  return new EllipticCurve(field, a, b, null);
}

代码示例来源：origin: horrorho/InflatableDonkey

@Deprecated
public static ECPoint decompressFPPoint(ECCurve curve, BigInteger X) {
  // See Andrey Jivsov https://www.ietf.org/archive/id/draft-jivsov-ecc-compact-05.txt.
  ECFieldElement x = curve.fromBigInteger(X);
  ECFieldElement rhs = x.square().add(curve.getA()).multiply(x).add(curve.getB());
  // y' = sqrt( C(x) ), where y'>0
  ECFieldElement yTilde = rhs.sqrt();
  if (yTilde == null) {
    throw new IllegalArgumentException("invalid point compression");
  }
  // y = min(y',p-y')
  BigInteger yT = yTilde.toBigInteger();
  BigInteger yTn = yTilde.negate().toBigInteger();
  BigInteger y = yT.compareTo(yTn) == -1 ? yT : yTn;
  // Q=(x,y) is the canonical representation of the point
  ECPoint Q = curve.createPoint(X, y);
  return Q;
}

代码示例来源：origin: horrorho/InflatableDonkey

public static BigInteger y(ECCurve curve, BigInteger x) {
  // Andrey Jivsov https://www.ietf.org/archive/id/draft-jivsov-ecc-compact-05.txt.
  ECFieldElement X = curve.fromBigInteger(x);
  ECFieldElement rhs = X.square().add(curve.getA()).multiply(X).add(curve.getB());
  // y' = sqrt( C(x) ), where y'>0
  ECFieldElement yTilde = rhs.sqrt();
  if (yTilde == null) {
    throw new IllegalArgumentException("invalid point compression");
  }
  // y = min(y',p-y')
  BigInteger yT = yTilde.toBigInteger();
  BigInteger yTn = yTilde.negate().toBigInteger();
  BigInteger y = yT.compareTo(yTn) == -1 ? yT : yTn;
  return y;
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public static String generateKeyFingerprint(ECPoint publicPoint, org.bouncycastle.jce.spec.ECParameterSpec spec)
  {
    ECCurve curve = spec.getCurve();
    ECPoint g = spec.getG();

    if (curve != null)
    {
      return new Fingerprint(Arrays.concatenate(publicPoint.getEncoded(false), curve.getA().getEncoded(), curve.getB().getEncoded(), g.getEncoded(false))).toString();
    }

    return new Fingerprint(publicPoint.getEncoded(false)).toString();
  }
}

代码示例来源：origin: redfish64/TinyTravelTracker

public DSTU4145ECBinary(ECDomainParameters params)
{
  ECCurve curve = params.getCurve();
  if (!ECAlgorithms.isF2mCurve(curve))
  {
    throw new IllegalArgumentException("only binary domain is possible");
  }
  // We always use big-endian in parameter encoding
  PolynomialExtensionField field = (PolynomialExtensionField)curve.getField();
  int[] exponents = field.getMinimalPolynomial().getExponentsPresent();
  if (exponents.length == 3)
  {
    f = new DSTU4145BinaryField(exponents[2], exponents[1]);
  }
  else if (exponents.length == 5)
  {
    f = new DSTU4145BinaryField(exponents[4], exponents[1], exponents[2], exponents[3]);
  }
  a = new ASN1Integer(curve.getA().toBigInteger());
  b = new DEROctetString(curve.getB().getEncoded());
  n = new ASN1Integer(params.getN());
  bp = new DEROctetString(DSTU4145PointEncoder.encodePoint(params.getG()));
}

代码示例来源：origin: cn.hutool/hutool-all

/**
   * 解码恢复EC压缩公钥,支持Base64和Hex编码,（基于BouncyCastle）<br>
   * 见：https://www.cnblogs.com/xinzhao/p/8963724.html
   * 
   * @param encodeByte 压缩公钥
   * @param curveName EC曲线名
   * @since 4.4.4
   */
  public static PublicKey decodeECPoint(byte[] encodeByte, String curveName) {
    final org.bouncycastle.jce.spec.ECNamedCurveParameterSpec namedSpec = org.bouncycastle.jce.ECNamedCurveTable.getParameterSpec(curveName);
    final ECCurve curve = namedSpec.getCurve();
    final EllipticCurve ecCurve = new EllipticCurve(//
        new ECFieldFp(curve.getField().getCharacteristic()), //
        curve.getA().toBigInteger(), //
        curve.getB().toBigInteger());
    // 根据X恢复点Y
    final ECPoint point = org.bouncycastle.jce.ECPointUtil.decodePoint(ecCurve, encodeByte);

    // 根据曲线恢复公钥格式
    java.security.spec.ECParameterSpec ecSpec = new org.bouncycastle.jce.spec.ECNamedCurveSpec(curveName, curve, namedSpec.getG(), namedSpec.getN());
    
    final KeyFactory PubKeyGen = getKeyFactory("EC");
    try {
      return PubKeyGen.generatePublic(new ECPublicKeySpec(point, ecSpec));
    } catch (GeneralSecurityException e) {
      throw new CryptoException(e);
    }
  }
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

private byte[] getZ(Digest digest, byte[] userID, ECPoint pubPoint)
{
  addUserID(digest, userID);
  addFieldElement(digest, ecParams.getCurve().getA());
  addFieldElement(digest, ecParams.getCurve().getB());
  addFieldElement(digest, ecParams.getG().getAffineXCoord());
  addFieldElement(digest, ecParams.getG().getAffineYCoord());
  addFieldElement(digest, pubPoint.getAffineXCoord());
  addFieldElement(digest, pubPoint.getAffineYCoord());
  return digestDoFinal();
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

private byte[] getZ(byte[] userID)
{
  digest.reset();
  addUserID(digest, userID);
  addFieldElement(digest, ecParams.getCurve().getA());
  addFieldElement(digest, ecParams.getCurve().getB());
  addFieldElement(digest, ecParams.getG().getAffineXCoord());
  addFieldElement(digest, ecParams.getG().getAffineYCoord());
  addFieldElement(digest, pubPoint.getAffineXCoord());
  addFieldElement(digest, pubPoint.getAffineYCoord());
  byte[] result = new byte[digest.getDigestSize()];
  digest.doFinal(result, 0);
  return result;
}

代码示例来源：origin: org.xipki/security

public static byte[] getSM2Z(byte[] userID, ASN1ObjectIdentifier curveOid,
  BigInteger pubPointX, BigInteger pubPointY) {
 SM3Digest digest = new SM3Digest();
 addUserId(digest, userID);
 X9ECParameters ecParams = GMNamedCurves.getByOID(curveOid);
 addFieldElement(digest, ecParams.getCurve().getA());
 addFieldElement(digest, ecParams.getCurve().getB());
 addFieldElement(digest, ecParams.getG().getAffineXCoord());
 addFieldElement(digest, ecParams.getG().getAffineYCoord());
 int fieldSize = (ecParams.getCurve().getFieldSize() + 7) / 8;
 byte[] bytes = BigIntegers.asUnsignedByteArray(fieldSize, pubPointX);
 digest.update(bytes, 0, fieldSize);
 bytes = BigIntegers.asUnsignedByteArray(fieldSize, pubPointY);
 digest.update(bytes, 0, fieldSize);
 byte[] result = new byte[digest.getDigestSize()];
 digest.doFinal(result, 0);
 return result;
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public ECPoint twice()
{
  if (this.isInfinity())
  {
    return this;
  }
  ECCurve curve = this.getCurve();
  ECFieldElement X1 = this.x;
  if (X1.isZero())
  {
    // A point with X == 0 is it's own additive inverse
    return curve.getInfinity();
  }
  ECFieldElement L1 = this.y, Z1 = this.zs[0];
  boolean Z1IsOne = Z1.isOne();
  ECFieldElement L1Z1 = Z1IsOne ? L1 : L1.multiply(Z1);
  ECFieldElement Z1Sq = Z1IsOne ? Z1 : Z1.square();
  ECFieldElement T = L1.square().add(L1Z1).add(Z1Sq);
  if (T.isZero())
  {
    return new SecT233R1Point(curve, T, curve.getB().sqrt(), withCompression);
  }
  ECFieldElement X3 = T.square();
  ECFieldElement Z3 = Z1IsOne ? T : T.multiply(Z1Sq);
  ECFieldElement X1Z1 = Z1IsOne ? X1 : X1.multiply(Z1);
  ECFieldElement L3 = X1Z1.squarePlusProduct(T, L1Z1).add(X3).add(Z3);
  return new SecT233R1Point(curve, X3, L3, new ECFieldElement[]{ Z3 }, this.withCompression);
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public ECPoint twice()
{
  if (this.isInfinity())
  {
    return this;
  }
  ECCurve curve = this.getCurve();
  ECFieldElement X1 = this.x;
  if (X1.isZero())
  {
    // A point with X == 0 is it's own additive inverse
    return curve.getInfinity();
  }
  ECFieldElement L1 = this.y, Z1 = this.zs[0];
  boolean Z1IsOne = Z1.isOne();
  ECFieldElement L1Z1 = Z1IsOne ? L1 : L1.multiply(Z1);
  ECFieldElement Z1Sq = Z1IsOne ? Z1 : Z1.square();
  ECFieldElement T = L1.square().add(L1Z1).add(Z1Sq);
  if (T.isZero())
  {
    return new SecT163R2Point(curve, T, curve.getB().sqrt(), withCompression);
  }
  ECFieldElement X3 = T.square();
  ECFieldElement Z3 = Z1IsOne ? T : T.multiply(Z1Sq);
  ECFieldElement X1Z1 = Z1IsOne ? X1 : X1.multiply(Z1);
  ECFieldElement L3 = X1Z1.squarePlusProduct(T, L1Z1).add(X3).add(Z3);
  return new SecT163R2Point(curve, X3, L3, new ECFieldElement[]{ Z3 }, this.withCompression);
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public ECPoint twice()
{
  if (this.isInfinity())
  {
    return this;
  }
  ECCurve curve = this.getCurve();
  ECFieldElement X1 = this.x;
  if (X1.isZero())
  {
    // A point with X == 0 is it's own additive inverse
    return curve.getInfinity();
  }
  ECFieldElement L1 = this.y, Z1 = this.zs[0];
  boolean Z1IsOne = Z1.isOne();
  ECFieldElement L1Z1 = Z1IsOne ? L1 : L1.multiply(Z1);
  ECFieldElement Z1Sq = Z1IsOne ? Z1 : Z1.square();
  ECFieldElement T = L1.square().add(L1Z1).add(Z1Sq);
  if (T.isZero())
  {
    return new SecT283R1Point(curve, T, curve.getB().sqrt(), withCompression);
  }
  ECFieldElement X3 = T.square();
  ECFieldElement Z3 = Z1IsOne ? T : T.multiply(Z1Sq);
  ECFieldElement X1Z1 = Z1IsOne ? X1 : X1.multiply(Z1);
  ECFieldElement L3 = X1Z1.squarePlusProduct(T, L1Z1).add(X3).add(Z3);
  return new SecT283R1Point(curve, X3, L3, new ECFieldElement[]{ Z3 }, this.withCompression);
}

代码示例来源：origin: org.bouncycastle/bcprov-debug-jdk15on

public ECPoint twice()
{
  if (this.isInfinity())
  {
    return this;
  }
  ECCurve curve = this.getCurve();
  ECFieldElement X1 = this.x;
  if (X1.isZero())
  {
    // A point with X == 0 is it's own additive inverse
    return curve.getInfinity();
  }
  ECFieldElement L1 = this.y, Z1 = this.zs[0];
  boolean Z1IsOne = Z1.isOne();
  ECFieldElement L1Z1 = Z1IsOne ? L1 : L1.multiply(Z1);
  ECFieldElement Z1Sq = Z1IsOne ? Z1 : Z1.square();
  ECFieldElement T = L1.square().add(L1Z1).add(Z1Sq);
  if (T.isZero())
  {
    return new SecT409R1Point(curve, T, curve.getB().sqrt(), withCompression);
  }
  ECFieldElement X3 = T.square();
  ECFieldElement Z3 = Z1IsOne ? T : T.multiply(Z1Sq);
  ECFieldElement X1Z1 = Z1IsOne ? X1 : X1.multiply(Z1);
  ECFieldElement L3 = X1Z1.squarePlusProduct(T, L1Z1).add(X3).add(Z3);
  return new SecT409R1Point(curve, X3, L3, new ECFieldElement[]{ Z3 }, this.withCompression);
}

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