Package org.bouncycastle.math.ec

Examples of org.bouncycastle.math.ec.ECPoint

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  public BigInteger calculateAgreement(
        CipherParameters pubKey)
  {
        ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey;
    ECPoint P = pub.getQ().multiply(key.getD());

    // if ( p.isInfinity() ) throw new RuntimeException("d*Q == infinity");

    return P.getX().toBigInteger();
  }
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     rawdataToPubkey(
       byte[] input )
    
       throws CryptoManagerException
     {
       ECPoint W = ECCparam.getCurve().decodePoint(input);
      
       KeySpec keyspec = new ECPublicKeySpec(W,(ECParameterSpec)ECCparam);

       try{
        
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        {
          k = new BigInteger(nBitLength, random);
        }
        while (k.equals(ZERO));

        ECPoint p = key.getParameters().getG().multiply(k);

        // 5.3.3
        BigInteger x = p.getX().toBigInteger();

        r = x.mod(n);
      }
      while ( r.equals(ZERO) );
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    BigInteger c = s.modInverse(n);

    BigInteger u1 = e.multiply(c).mod(n);
    BigInteger u2 = r.multiply(c).mod(n);

    ECPoint G = key.getParameters().getG();
    ECPoint Q = ((ECPublicKeyParameters)key).getQ();

    ECPoint point = G.multiply(u1).add(Q.multiply(u2));

    BigInteger v = point.getX().toBigInteger().mod(n);

    return v.equals(r);
  }
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    {
      d = new BigInteger(nBitLength, random);
    }
    while (d.equals(ZERO)  || (d.compareTo(n) >= 0));

    ECPoint Q = params.getG().multiply(d);

    return new AsymmetricCipherKeyPair(
            new ECPublicKeyParameters(Q, params),
      new ECPrivateKeyParameters(d, params));
  }
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        throws IOException
    {

        try
        {
            ECPoint Y = deserializeECPoint(ecPointFormats, curve_params.getCurve(), encoding);
            return new ECPublicKeyParameters(Y, curve_params);
        }
        catch (RuntimeException e)
        {
            throw new TlsFatalAlert(AlertDescription.illegal_parameter);
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            {
                BigInteger prime_p = readECParameter(input);
                BigInteger a = readECFieldElement(prime_p.bitLength(), input);
                BigInteger b = readECFieldElement(prime_p.bitLength(), input);
                ECCurve curve = new ECCurve.Fp(prime_p, a, b);
                ECPoint base = deserializeECPoint(ecPointFormats, curve, TlsUtils.readOpaque8(input));
                BigInteger order = readECParameter(input);
                BigInteger cofactor = readECParameter(input);
                return new ECDomainParameters(curve, base, order, cofactor);
            }
            case ECCurveType.explicit_char2:
            {
                int m = TlsUtils.readUint16(input);
                short basis = TlsUtils.readUint8(input);
                ECCurve curve;
                switch (basis)
                {
                case ECBasisType.ec_basis_trinomial:
                {
                    int k = readECExponent(m, input);
                    BigInteger a = readECFieldElement(m, input);
                    BigInteger b = readECFieldElement(m, input);
                    curve = new ECCurve.F2m(m, k, a, b);
                    break;
                }
                case ECBasisType.ec_basis_pentanomial:
                {
                    int k1 = readECExponent(m, input);
                    int k2 = readECExponent(m, input);
                    int k3 = readECExponent(m, input);
                    BigInteger a = readECFieldElement(m, input);
                    BigInteger b = readECFieldElement(m, input);
                    curve = new ECCurve.F2m(m, k1, k2, k3, a, b);
                    break;
                }
                default:
                    throw new TlsFatalAlert(AlertDescription.illegal_parameter);
                }
                ECPoint base = deserializeECPoint(ecPointFormats, curve, TlsUtils.readOpaque8(input));
                BigInteger order = readECParameter(input);
                BigInteger cofactor = readECParameter(input);
                return new ECDomainParameters(curve, base, order, cofactor);
            }
            case ECCurveType.named_curve:
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        {
            java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)params;
            this.ecParams = params;

            ECCurve curve = EC5Util.convertCurve(p.getCurve());
            ECPoint g = EC5Util.convertPoint(curve, p.getGenerator(), false);

            param = new ECKeyGenerationParameters(new ECDomainParameters(curve, g, p.getOrder(), BigInteger.valueOf(p.getCofactor())), random);

            engine.init(param);
            initialised = true;
        }
        else if (params instanceof ECGenParameterSpec || params instanceof ECNamedCurveGenParameterSpec)
        {
            String curveName;

            if (params instanceof ECGenParameterSpec)
            {
                curveName = ((ECGenParameterSpec)params).getName();
            }
            else
            {
                curveName = ((ECNamedCurveGenParameterSpec)params).getName();
            }

            ECDomainParameters ecP = ECGOST3410NamedCurves.getByName(curveName);
            if (ecP == null)
            {
                throw new InvalidAlgorithmParameterException("unknown curve name: " + curveName);
            }

            this.ecParams = new ECNamedCurveSpec(
                curveName,
                ecP.getCurve(),
                ecP.getG(),
                ecP.getN(),
                ecP.getH(),
                ecP.getSeed());

            java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)ecParams;

            ECCurve curve = EC5Util.convertCurve(p.getCurve());
            ECPoint g = EC5Util.convertPoint(curve, p.getGenerator(), false);

            param = new ECKeyGenerationParameters(new ECDomainParameters(curve, g, p.getOrder(), BigInteger.valueOf(p.getCofactor())), random);

            engine.init(param);
            initialised = true;
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    public BigInteger calculateAgreement(
        CipherParameters pubKey)
    {
        ECPublicKeyParameters   pub = (ECPublicKeyParameters)pubKey;
        ECDomainParameters      params = pub.getParameters();
        ECPoint P = pub.getQ().multiply(params.getH().multiply(key.getD()));

        // if (p.isInfinity()) throw new RuntimeException("Invalid public key");

        return P.getX().toBigInteger();
    }
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    public BigInteger calculateAgreement(
        CipherParameters pubKey)
    {
        ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey;
        ECPoint P = pub.getQ().multiply(key.getD());

        // if (p.isInfinity()) throw new RuntimeException("d*Q == infinity");

        return P.getX().toBigInteger();
    }
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Related Classes of org.bouncycastle.math.ec.ECPoint

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  • com.bitsofproof.supernode.common.ExtendedKey
  • com.nimbusds.jose.crypto.ECDSAVerifier
  • org.bouncycastle.crypto.agreement.ECDHBasicAgreement
  • org.bouncycastle.crypto.agreement.ECDHCBasicAgreement
  • org.bouncycastle.crypto.agreement.ECMQVBasicAgreement
  • org.bouncycastle.crypto.ec.ECElGamalDecryptor
  • org.bouncycastle.crypto.ec.ECElGamalEncryptor
  • org.bouncycastle.crypto.ec.ECNewPublicKeyTransform
  • org.bouncycastle.crypto.ec.ECNewRandomnessTransform
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