Java 类java.security.spec.ECParameterSpec 实例源码

项目：mDL-ILP 文件：EllipticCurveParameters.java

public static ECParameterSpec encodeECParameterSpec(EllipticCurveParameters params) {

        // Field
        final BigInteger pInt = new BigInteger(1, params.getP());
        final ECField field = new ECFieldFp(pInt);

        final BigInteger aInt = new BigInteger(1, params.getA());
        final BigInteger bInt = new BigInteger(1, params.getB());
        final EllipticCurve curve = new EllipticCurve(field, aInt, bInt);

        // Fixed Point G
        final BigInteger xInt = new BigInteger(1, params.getX());
        final BigInteger yInt = new BigInteger(1, params.getY());
        final ECPoint g = new ECPoint(xInt, yInt);

        // Order N
        final BigInteger nInt = new BigInteger(1, params.getN());

        return new ECParameterSpec(curve, g, nInt, params.getH());
    }

项目：mDL-ILP 文件：EllipticCurveParameters.java

public static ECParameterSpec encodeECParameterSpec(EllipticCurveParameters params) {

        // Field
        final BigInteger pInt = new BigInteger(1, params.getP());
        final ECField field = new ECFieldFp(pInt);

        final BigInteger aInt = new BigInteger(1, params.getA());
        final BigInteger bInt = new BigInteger(1, params.getB());
        final EllipticCurve curve = new EllipticCurve(field, aInt, bInt);

        // Fixed Point G
        final BigInteger xInt = new BigInteger(1, params.getX());
        final BigInteger yInt = new BigInteger(1, params.getY());
        final ECPoint g = new ECPoint(xInt, yInt);

        // Order N
        final BigInteger nInt = new BigInteger(1, params.getN());

        return new ECParameterSpec(curve, g, nInt, params.getH());
    }

项目：GitHub 文件：EcCore.java

private static BigInteger[] addPointsA(BigInteger[] P1, BigInteger[] P2,
    ECParameterSpec params) {
  final BigInteger p = ((ECFieldFp) params.getCurve().getField()).getP();

  if (P2[0] == null || P2[1] == null) return P1;

  if (P1[0] == null || P1[1] == null) return P2;

  BigInteger d = (P2[1].subtract(P1[1])).multiply((P2[0].subtract(P1[0]))
      .modInverse(p));
  BigInteger[] R = new BigInteger[2];
  R[0] = d.pow(2).subtract(P1[0]).subtract(P2[0]).mod(p);
  R[1] = d.multiply(P1[0].subtract(R[0])).subtract(P1[1]).mod(p);

  return R;
}

项目：mi-firma-android 文件：JseCryptoHelper.java

private static ECParameterSpec mapNonceGMWithECDH(final BigInteger nonceS,
                                                  final ECPoint sharedSecretPointH,
                                                  final ECParameterSpec params) {
    // D~ = (p, a, b, G~, n, h) where G~ = [s]G + H
    final ECPoint generator = params.getGenerator();
    final EllipticCurve curve = params.getCurve();
    final BigInteger a = curve.getA();
    final BigInteger b = curve.getB();
    final ECFieldFp field = (ECFieldFp)curve.getField();
    final BigInteger p = field.getP();
    final BigInteger order = params.getOrder();
    final int cofactor = params.getCofactor();
    final ECPoint ephemeralGenerator = add(multiply(nonceS, generator, params), sharedSecretPointH, params);
    if (!toBouncyCastleECPoint(ephemeralGenerator, params).isValid()) {
        LOGGER.warning("Se ha generado un punto invalido"); //$NON-NLS-1$
    }
    return new ECParameterSpec(new EllipticCurve(new ECFieldFp(p), a, b), ephemeralGenerator, order, cofactor);
}

项目：ipack 文件：JCEECPublicKey.java

public JCEECPublicKey(
    String              algorithm,
    org.bouncycastle.jce.spec.ECPublicKeySpec     spec)
{
    this.algorithm = algorithm;
    this.q = spec.getQ();

    if (spec.getParams() != null) // can be null if implictlyCa
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        if (q.getCurve() == null)
        {
            org.bouncycastle.jce.spec.ECParameterSpec s = BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();

            q = s.getCurve().createPoint(q.getX().toBigInteger(), q.getY().toBigInteger(), false);
        }               
        this.ecSpec = null;
    }
}

项目：ipack 文件：JCEECPublicKey.java

public JCEECPublicKey(
    String                  algorithm,
    ECPublicKeyParameters   params,
    ECParameterSpec         spec)
{
    ECDomainParameters      dp = params.getParameters();

    this.algorithm = algorithm;
    this.q = params.getQ();

    if (spec == null)
    {
        EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());

        this.ecSpec = createSpec(ellipticCurve, dp);
    }
    else
    {
        this.ecSpec = spec;
    }
}

项目：ipack 文件：BCDSTU4145PublicKey.java

public BCDSTU4145PublicKey(
    org.bouncycastle.jce.spec.ECPublicKeySpec spec)
{
    this.q = spec.getQ();

    if (spec.getParams() != null) // can be null if implictlyCa
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        if (q.getCurve() == null)
        {
            org.bouncycastle.jce.spec.ECParameterSpec s = BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();

            q = s.getCurve().createPoint(q.getX().toBigInteger(), q.getY().toBigInteger(), false);
        }
        this.ecSpec = null;
    }
}

项目：ipack 文件：BCDSTU4145PublicKey.java

public BCDSTU4145PublicKey(
    String algorithm,
    ECPublicKeyParameters params,
    ECParameterSpec spec)
{
    ECDomainParameters dp = params.getParameters();

    this.algorithm = algorithm;
    this.q = params.getQ();

    if (spec == null)
    {
        EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());

        this.ecSpec = createSpec(ellipticCurve, dp);
    }
    else
    {
        this.ecSpec = spec;
    }
}

项目：ipack 文件：BCECPublicKey.java

public BCECPublicKey(
    String algorithm,
    ECPublicKeyParameters params,
    ECParameterSpec spec,
    ProviderConfiguration configuration)
{
    ECDomainParameters      dp = params.getParameters();

    this.algorithm = algorithm;
    this.q = params.getQ();

    if (spec == null)
    {
        EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());

        this.ecSpec = createSpec(ellipticCurve, dp);
    }
    else
    {
        this.ecSpec = spec;
    }

    this.configuration = configuration;
}

项目：ipack 文件：EC5Util.java

public static ECParameterSpec convertSpec(
    EllipticCurve ellipticCurve,
    org.bouncycastle.jce.spec.ECParameterSpec spec)
{
    if (spec instanceof ECNamedCurveParameterSpec)
    {
        return new ECNamedCurveSpec(
            ((ECNamedCurveParameterSpec)spec).getName(),
            ellipticCurve,
            new ECPoint(
                spec.getG().getX().toBigInteger(),
                spec.getG().getY().toBigInteger()),
            spec.getN(),
            spec.getH());
    }
    else
    {
        return new ECParameterSpec(
            ellipticCurve,
            new ECPoint(
                spec.getG().getX().toBigInteger(),
                spec.getG().getY().toBigInteger()),
            spec.getN(),
            spec.getH().intValue());
    }
}

项目：bubichain-sdk-java 文件：Sm2keyCFCA.java

public static ECParameterSpec CfcaCurve() {
    // 素数P
    BigInteger p = new BigInteger("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF", 16);

    // 基于素数P的有限域
    ECFieldFp gfp = new ECFieldFp(p);

    // 在有限域上的椭圆曲线y2 = x3 + ax + b
    EllipticCurve ellipticCurve = new EllipticCurve(gfp,
            new BigInteger("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC", 16),
            new BigInteger("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93", 16));

    // 基点G
    ECPoint G = new ECPoint(new BigInteger("32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7", 16),
            new BigInteger("BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0", 16));

    // G的阶
    BigInteger n = new BigInteger("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", 16);

    // 设置基点
    ECParameterSpec ecParameterSpec = new ECParameterSpec(ellipticCurve, G, n, 1);
    return ecParameterSpec;
}

项目：ipack 文件：BCECGOST3410PublicKey.java

public BCECGOST3410PublicKey(
    String algorithm,
    ECPublicKeyParameters params,
    ECParameterSpec spec)
{
    ECDomainParameters      dp = params.getParameters();

    this.algorithm = algorithm;
    this.q = params.getQ();

    if (spec == null)
    {
        EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());

        this.ecSpec = createSpec(ellipticCurve, dp);
    }
    else
    {
        this.ecSpec = spec;
    }
}

项目：RISE-V2G 文件：SecurityUtils.java

/**
 * Returns the ECPublicKey instance from its encoded raw bytes. 
 * The first byte has the fixed value 0x04 indicating the uncompressed form.
 * Therefore, the byte array must be of form: [0x04, x coord of point (32 bytes), y coord of point (32 bytes)]
 * 
 * @param publicKeyBytes The byte array representing the encoded raw bytes of the public key
 * @return The ECPublicKey instance
 */
public static ECPublicKey getPublicKey(byte[] publicKeyBytes) {
    // First we separate x and y of coordinates into separate variables
    byte[] x = new byte[32];
    byte[] y = new byte[32];
    System.arraycopy(publicKeyBytes, 1, x, 0, 32);
    System.arraycopy(publicKeyBytes, 33, y, 0, 32);

    try {
        KeyFactory kf = KeyFactory.getInstance("EC");

        AlgorithmParameters parameters = AlgorithmParameters.getInstance("EC");
        parameters.init(new ECGenParameterSpec("secp256r1"));
        ECParameterSpec ecParameterSpec = parameters.getParameterSpec(ECParameterSpec.class);

        ECPublicKeySpec ecPublicKeySpec = new ECPublicKeySpec(new ECPoint(new BigInteger(x), new BigInteger(y)), ecParameterSpec);
        ECPublicKey ecPublicKey = (ECPublicKey) kf.generatePublic(ecPublicKeySpec);
        return ecPublicKey;
    } catch (NoSuchAlgorithmException | InvalidParameterSpecException | InvalidKeySpecException e) {
        getLogger().error(e.getClass().getSimpleName() + " occurred when trying to get public key from raw bytes", e);
        return null;
    }
}

项目：RISE-V2G 文件：SecurityUtils.java

/**
 * Returns the ECPrivateKey instance from its raw bytes. Note that you must provide the "s" value of the 
 * private key, not e.g. the byte array from reading a PKCS#8 key file.
 * 
 * @param privateKeyBytes The byte array (the "s" value) of the private key
 * @return The ECPrivateKey instance
 */
public static ECPrivateKey getPrivateKey(byte[] privateKeyBytes) {
    try {
        AlgorithmParameters parameters = AlgorithmParameters.getInstance("EC");
        parameters.init(new ECGenParameterSpec("secp256r1"));

        ECParameterSpec ecParameterSpec = parameters.getParameterSpec(ECParameterSpec.class);
        ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(new BigInteger(privateKeyBytes), ecParameterSpec);

        ECPrivateKey privateKey = (ECPrivateKey) KeyFactory.getInstance("EC").generatePrivate(ecPrivateKeySpec);

        return privateKey;
    } catch (NoSuchAlgorithmException | InvalidKeySpecException | InvalidParameterSpecException e) {
        getLogger().error(e.getClass().getSimpleName() + " occurred when trying to get private key from raw bytes", e);
        return null;
    }
}

项目：mi-firma-android 文件：JseCryptoHelper.java

private static ECParameterSpec mapNonceGMWithECDH(final BigInteger nonceS,
                                                  final ECPoint sharedSecretPointH,
                                                  final ECParameterSpec params) {
    // D~ = (p, a, b, G~, n, h) where G~ = [s]G + H
    final ECPoint generator = params.getGenerator();
    final EllipticCurve curve = params.getCurve();
    final BigInteger a = curve.getA();
    final BigInteger b = curve.getB();
    final ECFieldFp field = (ECFieldFp)curve.getField();
    final BigInteger p = field.getP();
    final BigInteger order = params.getOrder();
    final int cofactor = params.getCofactor();
    final ECPoint ephemeralGenerator = add(multiply(nonceS, generator, params), sharedSecretPointH, params);
    if (!toSpongyCastleECPoint(ephemeralGenerator, params).isValid()) {
        LOGGER.warning("Se ha generado un punto invalido"); //$NON-NLS-1$
    }
    return new ECParameterSpec(new EllipticCurve(new ECFieldFp(p), a, b), ephemeralGenerator, order, cofactor);
}

项目：OpenJSharp 文件：ECKeyPairGenerator.java

@Override
public void initialize(AlgorithmParameterSpec params, SecureRandom random)
        throws InvalidAlgorithmParameterException {

    if (params instanceof ECParameterSpec) {
        this.params = ECUtil.getECParameterSpec(null,
                                                (ECParameterSpec)params);
        if (this.params == null) {
            throw new InvalidAlgorithmParameterException(
                "Unsupported curve: " + params);
        }
    } else if (params instanceof ECGenParameterSpec) {
        String name = ((ECGenParameterSpec)params).getName();
        this.params = ECUtil.getECParameterSpec(null, name);
        if (this.params == null) {
            throw new InvalidAlgorithmParameterException(
                "Unknown curve name: " + name);
        }
    } else {
        throw new InvalidAlgorithmParameterException(
            "ECParameterSpec or ECGenParameterSpec required for EC");
    }
    this.keySize =
        ((ECParameterSpec)this.params).getCurve().getField().getFieldSize();
    this.random = random;
}

项目：wolfcrypt-jni 文件：Ecc.java

public static String getCurveName(ECParameterSpec spec)
    throws InvalidAlgorithmParameterException
{
    int curve_id;

    /* Ecc object doesn't need to be initialied before call */
    if (!(spec.getCurve().getField() instanceof ECFieldFp)) {
        throw new InvalidAlgorithmParameterException(
            "Currently only ECFieldFp fields supported");
    }
    ECFieldFp field = (ECFieldFp)spec.getCurve().getField();
    EllipticCurve curve = spec.getCurve();

    curve_id = wc_ecc_get_curve_id_from_params(
                field.getFieldSize(),
                field.getP().toByteArray(),
                curve.getA().toByteArray(),
                curve.getB().toByteArray(),
                spec.getOrder().toByteArray(),
                spec.getGenerator().getAffineX().toByteArray(),
                spec.getGenerator().getAffineY().toByteArray(),
                spec.getCofactor());

    return wc_ecc_get_curve_name_from_id(curve_id);
}

项目：wolfcrypt-jni 文件：EccTest.java

@Test
public void getEccCurveNameFromSpec()
    throws InvalidAlgorithmParameterException, NoSuchAlgorithmException {

    /* generate key pair */
    KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC");
    ECGenParameterSpec genSpec = new ECGenParameterSpec("secp256r1");
    kpg.initialize(genSpec);

    KeyPair pair = kpg.genKeyPair();
    ECPrivateKey priv = (ECPrivateKey)pair.getPrivate();

    ECParameterSpec spec = priv.getParams();

    String curveName = Ecc.getCurveName(spec);

    assertEquals(curveName, "SECP256R1");
}

项目：openjdk-jdk10 文件：DOMKeyValue.java

private static String getCurveOid(ECParameterSpec params) {
    // Check that the params represent one of the supported
    // curves. If there is a match, return the object identifier
    // of the curve.
    Curve match;
    if (matchCurve(params, SECP256R1)) {
        match = SECP256R1;
    } else if (matchCurve(params, SECP384R1)) {
        match = SECP384R1;
    } else if (matchCurve(params, SECP521R1)) {
        match = SECP521R1;
    } else {
        return null;
    }
    return match.getObjectId();
}

项目：openjdk-jdk10 文件：GenerationTests.java

private static PrivateKey getECPrivateKey(String curve) throws Exception {
    String s;
    ECParameterSpec params;
    switch (curve) {
        case "P256":
            s = EC_P256_S;
            params = EC_P256_PARAMS;
            break;
        case "P384":
            s = EC_P384_S;
            params = EC_P384_PARAMS;
            break;
        case "P521":
            s = EC_P521_S;
            params = EC_P521_PARAMS;
            break;
        default:
            throw new Exception("Unsupported curve: " + curve);
    }
    KeyFactory kf = KeyFactory.getInstance("EC");
    KeySpec kspec = new ECPrivateKeySpec(new BigInteger(s), params);
    return kf.generatePrivate(kspec);
}

项目：mDL-ILP 文件：ECCUtils.java

/**
 * Generates a random key pair based on a curve
 * @param curve the curve to use
 * @return a randomly generated KeyPair
 */
public static KeyPair generateEphemeralKeys(EllipticCurveParameters curve) {
    try {
        final ECParameterSpec curveParams = EllipticCurveParameters.encodeECParameterSpec(curve);
        final KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC", "BC");
        keyPairGenerator.initialize(curveParams);

        return keyPairGenerator.generateKeyPair();
    } catch (NoSuchAlgorithmException | NoSuchProviderException | InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    }

    return null;
}

项目：mi-firma-android 文件：JseCryptoHelper.java

private static BigInteger getPrime(final ECParameterSpec params) {
    if (params == null) {
        throw new IllegalArgumentException(
            "Los parametros no pueden ser nulos" //$NON-NLS-1$
        );
    }
    final EllipticCurve curve = params.getCurve();
    final ECField field = curve.getField();
    if (!(field instanceof ECFieldFp)) {
        throw new IllegalStateException(
            "Solo se soporta 'ECFieldFp' y se proporciono  " + field.getClass().getCanonicalName() //$NON-NLS-1$
        );
    }
    return ((ECFieldFp)field).getP();
}

项目：mDL-ILP 文件：ECCUtils.java

/**
 * Generates a random key pair based on a curve
 * @param curve the curve to use
 * @return a randomly generated KeyPair
 */
public static KeyPair generateEphemeralKeys(EllipticCurveParameters curve) {
    try {
        final ECParameterSpec curveParams = EllipticCurveParameters.encodeECParameterSpec(curve);
        final KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC", "BC");
        keyPairGenerator.initialize(curveParams);

        return keyPairGenerator.generateKeyPair();
    } catch (NoSuchAlgorithmException | NoSuchProviderException | InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    }

    return null;
}

项目：GitHub 文件：EcCore.java

public static BigInteger[] multiplyPointA(BigInteger[] P, BigInteger k,
    ECParameterSpec params) {
  BigInteger[] Q = new BigInteger[] {null, null};

  for (int i = k.bitLength() - 1; i >= 0; i--) {
    Q = doublePointA(Q, params);
    if (k.testBit(i)) Q = addPointsA(Q, P, params);
  }

  return Q;
}

项目：ipack 文件：JCEECPrivateKey.java

public JCEECPrivateKey(
    String                  algorithm,
    ECPrivateKeyParameters  params,
    JCEECPublicKey          pubKey,
    ECParameterSpec         spec)
{
    ECDomainParameters      dp = params.getParameters();

    this.algorithm = algorithm;
    this.d = params.getD();

    if (spec == null)
    {
        EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());

        this.ecSpec = new ECParameterSpec(
                        ellipticCurve,
                        new ECPoint(
                                dp.getG().getX().toBigInteger(),
                                dp.getG().getY().toBigInteger()),
                        dp.getN(),
                        dp.getH().intValue());
    }
    else
    {
        this.ecSpec = spec;
    }

    publicKey = getPublicKeyDetails(pubKey);
}

项目：ipack 文件：JCEECPrivateKey.java

public org.bouncycastle.jce.spec.ECParameterSpec getParameters()
{
    if (ecSpec == null)
    {
        return null;
    }

    return EC5Util.convertSpec(ecSpec, withCompression);
}

项目：ipack 文件：JCEECPrivateKey.java

org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
    if (ecSpec != null)
    {
        return EC5Util.convertSpec(ecSpec, withCompression);
    }

    return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}

项目：ipack 文件：JCEECPublicKey.java

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());
}

项目：ipack 文件：JCEECPublicKey.java

public org.bouncycastle.jce.spec.ECParameterSpec getParameters()
{
    if (ecSpec == null)     // implictlyCA
    {
        return null;
    }

    return EC5Util.convertSpec(ecSpec, withCompression);
}

项目：ipack 文件：JCEECPublicKey.java

org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
    if (ecSpec != null)
    {
        return EC5Util.convertSpec(ecSpec, withCompression);
    }

    return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}

项目：ipack 文件：BCDSTU4145PrivateKey.java

public BCDSTU4145PrivateKey(
    String algorithm,
    ECPrivateKeyParameters params,
    BCDSTU4145PublicKey pubKey,
    ECParameterSpec spec)
{
    ECDomainParameters dp = params.getParameters();

    this.algorithm = algorithm;
    this.d = params.getD();

    if (spec == null)
    {
        EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());

        this.ecSpec = new ECParameterSpec(
            ellipticCurve,
            new ECPoint(
                dp.getG().getX().toBigInteger(),
                dp.getG().getY().toBigInteger()),
            dp.getN(),
            dp.getH().intValue());
    }
    else
    {
        this.ecSpec = spec;
    }

    publicKey = getPublicKeyDetails(pubKey);
}

项目：ipack 文件：BCDSTU4145PrivateKey.java

public org.bouncycastle.jce.spec.ECParameterSpec getParameters()
{
    if (ecSpec == null)
    {
        return null;
    }

    return EC5Util.convertSpec(ecSpec, withCompression);
}

项目：ipack 文件：BCDSTU4145PrivateKey.java

org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
    if (ecSpec != null)
    {
        return EC5Util.convertSpec(ecSpec, withCompression);
    }

    return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}

项目：ipack 文件：BCDSTU4145PublicKey.java

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());
}

项目：mi-firma-android 文件：JseCryptoHelper.java

private static BigInteger computeAffineY(final BigInteger affineX, final ECParameterSpec params) {
    final ECCurve bcCurve = toBouncyCastleECCurve(params);
    final ECFieldElement a = bcCurve.getA();
    final ECFieldElement b = bcCurve.getB();
    final ECFieldElement x = bcCurve.fromBigInteger(affineX);
    final ECFieldElement y = x.multiply(x).add(a).multiply(x).add(b).sqrt();
    return y.toBigInteger();
}

项目：ipack 文件：BCDSTU4145PublicKey.java

org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
    if (ecSpec != null)
    {
        return EC5Util.convertSpec(ecSpec, withCompression);
    }

    return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}

项目：ipack 文件：BCECPrivateKey.java

public BCECPrivateKey(
    String algorithm,
    ECPrivateKeyParameters params,
    BCECPublicKey pubKey,
    ECParameterSpec spec,
    ProviderConfiguration configuration)
{
    ECDomainParameters      dp = params.getParameters();

    this.algorithm = algorithm;
    this.d = params.getD();
    this.configuration = configuration;

    if (spec == null)
    {
        EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());

        this.ecSpec = new ECParameterSpec(
                        ellipticCurve,
                        new ECPoint(
                                dp.getG().getX().toBigInteger(),
                                dp.getG().getY().toBigInteger()),
                        dp.getN(),
                        dp.getH().intValue());
    }
    else
    {
        this.ecSpec = spec;
    }

    publicKey = getPublicKeyDetails(pubKey);
}

项目：bubichain-sdk-java 文件：Sm2Key.java

protected static boolean Verify(byte[] msg, byte[] pkey, byte[] strsig, byte[] id, ECParameterSpec spec) {
    ECFieldFp fp = (ECFieldFp) spec.getCurve().getField();
    byte[] pb = fp.getP().toByteArray();
    int len = pb[0] == 0 ? pb.length - 1 : pb.length;
    byte[] r = new byte[len + 1];
    byte[] s = new byte[len + 1];
    System.arraycopy(strsig, 0, r, 1, len);
    System.arraycopy(strsig, len, s, 1, len);
    Sm2Signature sig = new Sm2Signature(new BigInteger(r), new BigInteger(s));

    ECPoint pt = PkeyByte2Point(spec, pkey);
    return Verify(spec, id, msg, pt, sig);
}

项目：ipack 文件：BCECPublicKey.java

public BCECPublicKey(
    String algorithm,
    org.bouncycastle.jce.spec.ECPublicKeySpec spec,
    ProviderConfiguration configuration)
{
    this.algorithm = algorithm;
    this.q = spec.getQ();

    if (spec.getParams() != null) // can be null if implictlyCa
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        if (q.getCurve() == null)
        {
            org.bouncycastle.jce.spec.ECParameterSpec s = configuration.getEcImplicitlyCa();

            q = s.getCurve().createPoint(q.getX().toBigInteger(), q.getY().toBigInteger(), false);
        }               
        this.ecSpec = null;
    }

    this.configuration = configuration;
}

项目：ipack 文件：BCECPublicKey.java

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());
}