org.bouncycastle.math.ec.ECCurve.fromBigInteger()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.fromBigInteger()方法的一些代码示例，展示了ECCurve.fromBigInteger()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.fromBigInteger()方法的具体详情如下：
包路径：org.bouncycastle.math.ec.ECCurve
类名称：ECCurve
方法名：fromBigInteger

ECCurve.fromBigInteger介绍

暂无

代码示例

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

/**
 * @deprecated per-point compression property will be removed, use {@link #createPoint(BigInteger, BigInteger)}
 * and refer {@link ECPoint#getEncoded(boolean)}
 */
public ECPoint createPoint(BigInteger x, BigInteger y, boolean withCompression)
{
  return createRawPoint(fromBigInteger(x), fromBigInteger(y), withCompression);
}

代码示例来源：origin: redfish64/TinyTravelTracker

/**
 * @deprecated per-point compression property will be removed, use {@link #createPoint(BigInteger, BigInteger)}
 * and refer {@link ECPoint#getEncoded(boolean)}
 */
public ECPoint createPoint(BigInteger x, BigInteger y, boolean withCompression)
{
  return createRawPoint(fromBigInteger(x), fromBigInteger(y), withCompression);
}

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

public ECPoint lookup(int index)
  {
    byte[] x = new byte[FE_BYTES], y = new byte[FE_BYTES];
    int pos = 0;
    for (int i = 0; i < len; ++i)
    {
      int MASK = ((i ^ index) - 1) >> 31;
      for (int j = 0; j < FE_BYTES; ++j)
      {
        x[j] ^= table[pos + j] & MASK;
        y[j] ^= table[pos + FE_BYTES + j] & MASK;
      }
      pos += (FE_BYTES * 2);
    }
    return createRawPoint(fromBigInteger(new BigInteger(1, x)), fromBigInteger(new BigInteger(1, y)), false);
  }
};

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

private static void implPrintRootZ(X9ECParameters x9)
{
  ECFieldElement z = x9.getCurve().fromBigInteger(BigInteger.valueOf(2));
  ECFieldElement rootZ = z.sqrt();
  System.out.println(rootZ.toBigInteger().toString(16).toUpperCase());
  if (!rootZ.square().equals(z))
  {
    throw new IllegalStateException("Optimized-sqrt sanity check failed");
  }
}

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

public GLVTypeBEndomorphism(ECCurve curve, GLVTypeBParameters parameters)
{
  this.curve = curve;
  this.parameters = parameters;
  this.pointMap = new ScaleXPointMap(curve.fromBigInteger(parameters.getBeta()));
}

代码示例来源：origin: redfish64/TinyTravelTracker

public GLVTypeBEndomorphism(ECCurve curve, GLVTypeBParameters parameters)
{
  this.curve = curve;
  this.parameters = parameters;
  this.pointMap = new ScaleXPointMap(curve.fromBigInteger(parameters.getBeta()));
}

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

private static ECFieldElement hash2FieldElement(ECCurve curve, byte[] hash)
{
  byte[] data = Arrays.reverse(hash);
  return curve.fromBigInteger(truncate(new BigInteger(1, data), curve.getFieldSize()));
}

代码示例来源：origin: redfish64/TinyTravelTracker

private static ECFieldElement hash2FieldElement(ECCurve curve, byte[] hash)
{
  byte[] data = Arrays.reverse(hash);
  return curve.fromBigInteger(truncate(new BigInteger(1, data), curve.getFieldSize()));
}

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

private static ECFieldElement[] findBetaValues(ECCurve c)
{
  BigInteger q = c.getField().getCharacteristic();
  BigInteger e = q.divide(ECConstants.THREE);
  // Search for a random value that generates a non-trival cube root of 1
  SecureRandom random = new SecureRandom();
  BigInteger b;
  do
  {
    BigInteger r = BigIntegers.createRandomInRange(ECConstants.TWO, q.subtract(ECConstants.TWO), random);
    b = r.modPow(e, q);
  }
  while (b.equals(ECConstants.ONE));
  ECFieldElement beta = c.fromBigInteger(b);
  return new ECFieldElement[]{ beta, beta.square() }; 
}

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

protected static ECFieldElement[] getInitialZCoords(ECCurve curve)
{
  // Cope with null curve, most commonly used by implicitlyCa
  int coord = null == curve ? ECCurve.COORD_AFFINE : curve.getCoordinateSystem();
  switch (coord)
  {
  case ECCurve.COORD_AFFINE:
  case ECCurve.COORD_LAMBDA_AFFINE:
    return EMPTY_ZS;
  default:
    break;
  }
  ECFieldElement one = curve.fromBigInteger(ECConstants.ONE);
  switch (coord)
  {
  case ECCurve.COORD_HOMOGENEOUS:
  case ECCurve.COORD_JACOBIAN:
  case ECCurve.COORD_LAMBDA_PROJECTIVE:
    return new ECFieldElement[]{ one };
  case ECCurve.COORD_JACOBIAN_CHUDNOVSKY:
    return new ECFieldElement[]{ one, one, one };
  case ECCurve.COORD_JACOBIAN_MODIFIED:
    return new ECFieldElement[]{ one, curve.getA() };
  default:
    throw new IllegalArgumentException("unknown coordinate system");
  }
}

代码示例来源：origin: redfish64/TinyTravelTracker

protected static ECFieldElement[] getInitialZCoords(ECCurve curve)
{
  // Cope with null curve, most commonly used by implicitlyCa
  int coord = null == curve ? ECCurve.COORD_AFFINE : curve.getCoordinateSystem();
  switch (coord)
  {
  case ECCurve.COORD_AFFINE:
  case ECCurve.COORD_LAMBDA_AFFINE:
    return EMPTY_ZS;
  default:
    break;
  }
  ECFieldElement one = curve.fromBigInteger(ECConstants.ONE);
  switch (coord)
  {
  case ECCurve.COORD_HOMOGENEOUS:
  case ECCurve.COORD_JACOBIAN:
  case ECCurve.COORD_LAMBDA_PROJECTIVE:
    return new ECFieldElement[]{ one };
  case ECCurve.COORD_JACOBIAN_CHUDNOVSKY:
    return new ECFieldElement[]{ one, one, one };
  case ECCurve.COORD_JACOBIAN_MODIFIED:
    return new ECFieldElement[]{ one, curve.getA() };
  default:
    throw new IllegalArgumentException("unknown coordinate system");
  }
}

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: redfish64/TinyTravelTracker

public boolean verifySignature(byte[] message, BigInteger r, BigInteger s)
{
  if (r.signum() <= 0 || s.signum() <= 0)
  {
    return false;
  }
  ECDomainParameters parameters = key.getParameters();
  BigInteger n = parameters.getN();
  if (r.compareTo(n) >= 0 || s.compareTo(n) >= 0)
  {
    return false;
  }
  ECCurve curve = parameters.getCurve();
  ECFieldElement h = hash2FieldElement(curve, message);
  if (h.isZero())
  {
    h = curve.fromBigInteger(ONE);
  }
  ECPoint R = ECAlgorithms.sumOfTwoMultiplies(parameters.getG(), s, ((ECPublicKeyParameters)key).getQ(), r).normalize();
  // components must be bogus.
  if (R.isInfinity())
  {
    return false;
  }
  ECFieldElement y = h.multiply(R.getAffineXCoord());
  return fieldElement2Integer(n, y).compareTo(r) == 0;
}

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

public boolean verifySignature(byte[] message, BigInteger r, BigInteger s)
{
  if (r.signum() <= 0 || s.signum() <= 0)
  {
    return false;
  }
  ECDomainParameters parameters = key.getParameters();
  BigInteger n = parameters.getN();
  if (r.compareTo(n) >= 0 || s.compareTo(n) >= 0)
  {
    return false;
  }
  ECCurve curve = parameters.getCurve();
  ECFieldElement h = hash2FieldElement(curve, message);
  if (h.isZero())
  {
    h = curve.fromBigInteger(ONE);
  }
  ECPoint R = ECAlgorithms.sumOfTwoMultiplies(parameters.getG(), s, ((ECPublicKeyParameters)key).getQ(), r).normalize();
  // components must be bogus.
  if (R.isInfinity())
  {
    return false;
  }
  ECFieldElement y = h.multiply(R.getAffineXCoord());
  return fieldElement2Integer(n, y).compareTo(r) == 0;
}

代码示例来源：origin: redfish64/TinyTravelTracker

ECFieldElement zeroElement = curve.fromBigInteger(ECConstants.ZERO);
do
  ECFieldElement t = curve.fromBigInteger(new BigInteger(m, rand));
  z = zeroElement;
  ECFieldElement w = beta;

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

ECFieldElement zeroElement = curve.fromBigInteger(ECConstants.ZERO);
do
  ECFieldElement t = curve.fromBigInteger(new BigInteger(m, rand));
  z = zeroElement;
  ECFieldElement w = beta;

代码示例来源：origin: redfish64/TinyTravelTracker

if (h.isZero())
  h = curve.fromBigInteger(ONE);

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

if (h.isZero())
  h = curve.fromBigInteger(ONE);

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

ECFieldElement k = curve.fromBigInteger(BigInteger.valueOf(bytes[bytes.length - 1] & 0x1));
ECFieldElement xp = curve.fromBigInteger(new BigInteger(1, bytes));
if (!trace(xp).equals(curve.getA()))

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