java.security.spec.ECPoint.<init>()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java.security.spec.ECPoint.<init>()方法的一些代码示例，展示了ECPoint.<init>()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。ECPoint.<init>()方法的具体详情如下：
包路径：java.security.spec.ECPoint
类名称：ECPoint
方法名：<init>

ECPoint.<init>介绍

[英]Creates a new point at the specified coordinates.
[中]在指定坐标处创建新点。

代码示例

代码示例来源：origin: hierynomus/sshj

/**
 * SECG 2.3.4 Octet String to ECPoint
 */
public static ECPoint getDecoded(byte[] M, EllipticCurve curve) {
  int elementSize = getElementSize(curve);
  if (M.length != 2 * elementSize + 1 || M[0] != 0x04) {
    throw new SSHRuntimeException("Invalid 'f' for Elliptic Curve " + curve.toString());
  }
  byte[] xBytes = new byte[elementSize];
  byte[] yBytes = new byte[elementSize];
  System.arraycopy(M, 1, xBytes, 0, elementSize);
  System.arraycopy(M, 1 + elementSize, yBytes, 0, elementSize);
  return new ECPoint(new BigInteger(1, xBytes), new BigInteger(1, yBytes));
}

代码示例来源：origin: hierynomus/sshj

X9ECParameters ecParams = NISTNamedCurves.getByName(name);
ECNamedCurveSpec ecCurveSpec = new ECNamedCurveSpec(name, ecParams.getCurve(), ecParams.getG(), ecParams.getN());
ECPoint p = new ECPoint(bigX, bigY);
ECPublicKeySpec publicKeySpec = new ECPublicKeySpec(p, ecCurveSpec);

代码示例来源：origin: oracle/helidon

.orElse(null);
ECPoint point = new ECPoint(x, y);
this.publicKey = toPublicKey(kf, point, keySpec);

代码示例来源：origin: SeanDragon/protools

ECPoint g = new ECPoint(x, y);

代码示例来源：origin: i2p/i2p.i2p

private static ECPoint doublePoint(ECPoint r, EllipticCurve curve) {
  if (r.equals(ECPoint.POINT_INFINITY)) 
    return r;
  BigInteger slope = (r.getAffineX().pow(2)).multiply(THREE);
  slope = slope.add(curve.getA());
  BigInteger prime = ((ECFieldFp) curve.getField()).getP();
  // use NBI modInverse();
  BigInteger tmp = r.getAffineY().multiply(TWO);
  tmp = new NativeBigInteger(tmp);
  slope = slope.multiply(tmp.modInverse(prime));
  BigInteger xOut = slope.pow(2).subtract(r.getAffineX().multiply(TWO)).mod(prime);
  BigInteger yOut = (r.getAffineY().negate()).add(slope.multiply(r.getAffineX().subtract(xOut))).mod(prime);
  ECPoint out = new ECPoint(xOut, yOut);
  return out;
}

代码示例来源：origin: i2p/i2p.i2p

private static ECPublicKey cvtToJavaECKey(SigningPublicKey pk)
             throws GeneralSecurityException {
  SigType type = pk.getType();
  BigInteger[] xy = split(pk.getData());
  ECPoint w = new ECPoint(xy[0], xy[1]);
  // see ECConstants re: casting
  ECPublicKeySpec ks = new ECPublicKeySpec(w, (ECParameterSpec) type.getParams());
  KeyFactory kf = KeyFactory.getInstance("EC");
  return (ECPublicKey) kf.generatePublic(ks);
}

代码示例来源：origin: i2p/i2p.i2p

public ECParameterSpec genSpec() {
    BigInteger pb = new NativeBigInteger(ps);
    BigInteger nb = new NativeBigInteger(ns);
    BigInteger sb = new NativeBigInteger(ss.replace(" ", ""), 16);
    BigInteger bb = new NativeBigInteger(bs.replace(" ", ""), 16);
    BigInteger gxb = new NativeBigInteger(gxs.replace(" ", ""), 16);
    BigInteger gyb = new NativeBigInteger(gys.replace(" ", ""), 16);
    BigInteger ab = new NativeBigInteger(A.mod(pb));
    ECField field = new ECFieldFp(pb);
    EllipticCurve curve = new EllipticCurve(field, ab, bb, sb.toByteArray());
    ECPoint g = new ECPoint(gxb, gyb);
    return new ECParameterSpec(curve, g, nb, H);
  }
}

代码示例来源：origin: i2p/i2p.i2p

private static ECPoint addPoint(ECPoint r, ECPoint s, EllipticCurve curve) {
  if (r.equals(s))
    return doublePoint(r, curve);
  else if (r.equals(ECPoint.POINT_INFINITY))
    return s;
  else if (s.equals(ECPoint.POINT_INFINITY))
    return r;
  BigInteger prime = ((ECFieldFp) curve.getField()).getP();
  // use NBI modInverse();
  BigInteger tmp = r.getAffineX().subtract(s.getAffineX());
  tmp = new NativeBigInteger(tmp);
  BigInteger slope = (r.getAffineY().subtract(s.getAffineY())).multiply(tmp.modInverse(prime)).mod(prime);
  slope = new NativeBigInteger(slope);
  BigInteger xOut = (slope.modPow(TWO, prime).subtract(r.getAffineX())).subtract(s.getAffineX()).mod(prime);
  BigInteger yOut = s.getAffineY().negate().mod(prime);
  yOut = yOut.add(slope.multiply(s.getAffineX().subtract(xOut))).mod(prime);
  ECPoint out = new ECPoint(xOut, yOut);
  return out;
}

代码示例来源：origin: RUB-NDS/TLS-Attacker

@Override
public ECPoint getW() {
  return new ECPoint(x, y);
}

代码示例来源：origin: org.apache.santuario/xmlsec

public static ECPoint decodePoint(byte[] encodedBytes, EllipticCurve elliptiCcurve) {
  if (encodedBytes[0] != 0x04) {
    throw new IllegalArgumentException("Only uncompressed format is supported");
  }
  int size = (elliptiCcurve.getField().getFieldSize() + 7) / 8;
  byte affineXBytes[] = new byte[size];
  byte affineYBytes[] = new byte[size];
  System.arraycopy(encodedBytes, 1, affineXBytes, 0, size);
  System.arraycopy(encodedBytes, size + 1, affineYBytes, 0, size);
  return new ECPoint(new BigInteger(1, affineXBytes), new BigInteger(1, affineYBytes));
}

代码示例来源：origin: RUB-NDS/TLS-Attacker

private static PublicKey generateEcPublicKey(GOSTCurve curve, CustomECPoint point, String keyFactoryAlg) {
  try {
    ECParameterSpec ecParameterSpec = getEcParameterSpec(curve);
    ECPoint ecPoint = new ECPoint(point.getX(), point.getY());
    ECPublicKeySpec privateKeySpec = new ECPublicKeySpec(ecPoint, ecParameterSpec);
    return KeyFactory.getInstance(keyFactoryAlg).generatePublic(privateKeySpec);
  } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
    LOGGER.error("Could not generate GOST public key", e);
    return null;
  }
}

代码示例来源：origin: apache/cxf

public static ECPublicKey getECPublicKey(String curve, byte[] xPoint, byte[] yPoint) {
  try {
    ECParameterSpec params = getECParameterSpec(curve, false);
    ECPoint ecPoint = new ECPoint(toBigInteger(xPoint),
                   toBigInteger(yPoint));
    ECPublicKeySpec keySpec = new ECPublicKeySpec(ecPoint, params);
    KeyFactory kf = KeyFactory.getInstance("EC");
    return (ECPublicKey) kf.generatePublic(keySpec);
  } catch (Exception ex) {
    throw new SecurityException(ex);
  }
}
private static BigInteger toBigInteger(byte[] bytes) {

代码示例来源：origin: org.apache.santuario/xmlsec

private static Curve initializeCurve(String name, String oid,
    String sfield, String a, String b,
    String x, String y, String n, int h) {
  BigInteger p = bigInt(sfield);
  ECField field = new ECFieldFp(p);
  EllipticCurve curve = new EllipticCurve(field, bigInt(a),
                      bigInt(b));
  ECPoint g = new ECPoint(bigInt(x), bigInt(y));
  return new Curve(name, oid, curve, g, bigInt(n), h);
}

代码示例来源：origin: tiandawu/IotXmpp

private static PublicKey
toECDSAPublicKey(KEYBase r, ECKeyInfo keyinfo) throws IOException,
  GeneralSecurityException, MalformedKeyException
{
  DNSInput in = new DNSInput(r.getKey());

  // RFC 6605 Section 4
  BigInteger x = readBigInteger(in, keyinfo.length);
  BigInteger y = readBigInteger(in, keyinfo.length);
  ECPoint q = new ECPoint(x, y);

  KeyFactory factory = KeyFactory.getInstance("EC");
  return factory.generatePublic(new ECPublicKeySpec(q, keyinfo.spec));
}

代码示例来源：origin: com.madgag.spongycastle/prov

private ECParameterSpec createSpec(EllipticCurve ellipticCurve, ECDomainParameters dp)
{
  return new ECParameterSpec(
    ellipticCurve,
    new ECPoint(
      dp.getG().getAffineXCoord().toBigInteger(),
      dp.getG().getAffineYCoord().toBigInteger()),
    dp.getN(),
    dp.getH().intValue());
}

代码示例来源：origin: com.madgag/scprov-jdk15on

private ECParameterSpec createSpec(EllipticCurve ellipticCurve, ECDomainParameters dp)
{
  return new ECParameterSpec(
      ellipticCurve,
      new ECPoint(
          dp.getG().getX().toBigInteger(),
          dp.getG().getY().toBigInteger()),
          dp.getN(),
          dp.getH().intValue());
}

代码示例来源：origin: com.madgag/scprov-jdk15on

private ECParameterSpec createSpec(EllipticCurve ellipticCurve, ECDomainParameters dp)
{
  return new ECParameterSpec(
      ellipticCurve,
      new ECPoint(
          dp.getG().getX().toBigInteger(),
          dp.getG().getY().toBigInteger()),
          dp.getN(),
          dp.getH().intValue());
}

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

public static ECPoint convertPoint(org.bouncycastle.math.ec.ECPoint point)
  {
    point = point.normalize();

    return new ECPoint(
      point.getAffineXCoord().toBigInteger(),
      point.getAffineYCoord().toBigInteger());
  }
}

代码示例来源：origin: es.gob.afirma.jmulticard/jmulticard

@Override
public AlgorithmParameterSpec getEcPoint(final byte[] nonceS, final byte[] sharedSecretH, final EcCurve curveName) {
  final AlgorithmParameterSpec ecParams = ECNamedCurveTable.getParameterSpec(curveName.toString());
  final BigInteger affineX = os2i(sharedSecretH);
  final BigInteger affineY = computeAffineY(affineX, (ECParameterSpec) ecParams);
  final ECPoint sharedSecretPointH = new ECPoint(affineX, affineY);
  return mapNonceGMWithECDH(os2i(nonceS), sharedSecretPointH, (ECParameterSpec) ecParams);
}

代码示例来源：origin: com.madgag.spongycastle/bcpkix-jdk15on

private java.security.spec.ECPoint getPublicPoint(ECDSAPublicKey key)
{
  if (!key.hasParameters())
  {
    throw new IllegalArgumentException("Public key does not contains EC Params");
  }
  BigInteger p = key.getPrimeModulusP();
  ECCurve.Fp curve = new ECCurve.Fp(p, key.getFirstCoefA(), key.getSecondCoefB(), key.getOrderOfBasePointR(), key.getCofactorF());
  ECPoint.Fp pubY = (ECPoint.Fp)curve.decodePoint(key.getPublicPointY());
  return new java.security.spec.ECPoint(pubY.getAffineXCoord().toBigInteger(), pubY.getAffineYCoord().toBigInteger());
}

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