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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    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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    {
        MQVPublicParameters pubParams = (MQVPublicParameters)pubKey;

        ECPrivateKeyParameters staticPrivateKey = privParams.getStaticPrivateKey();

        ECPoint agreement = calculateMqvAgreement(staticPrivateKey.getParameters(), staticPrivateKey,
            privParams.getEphemeralPrivateKey(), privParams.getEphemeralPublicKey(),
            pubParams.getStaticPublicKey(), pubParams.getEphemeralPublicKey());

        return agreement.getX().toBigInteger();
    }
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        BigInteger n = parameters.getN();
        int e = (n.bitLength() + 1) / 2;
        BigInteger powE = ECConstants.ONE.shiftLeft(e);

        // The Q2U public key is optional
        ECPoint q;
        if (Q2U == null)
        {
            q = parameters.getG().multiply(d2U.getD());
        }
        else
        {
            q = Q2U.getQ();
        }

        BigInteger x = q.getX().toBigInteger();
        BigInteger xBar = x.mod(powE);
        BigInteger Q2UBar = xBar.setBit(e);
        BigInteger s = d1U.getD().multiply(Q2UBar).mod(n).add(d2U.getD()).mod(n);

        BigInteger xPrime = Q2V.getQ().getX().toBigInteger();
        BigInteger xPrimeBar = xPrime.mod(powE);
        BigInteger Q2VBar = xPrimeBar.setBit(e);

        BigInteger hs = parameters.getH().multiply(s).mod(n);

//        ECPoint p = Q1V.getQ().multiply(Q2VBar).add(Q2V.getQ()).multiply(hs);
        ECPoint p = ECAlgorithms.sumOfTwoMultiplies(
            Q1V.getQ(), Q2VBar.multiply(hs).mod(n), Q2V.getQ(), hs);

        if (p.isInfinity())
        {
            throw new IllegalStateException("Infinity is not a valid agreement value for MQV");
        }

        return p;
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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)
            {
                final String curveName = ((ECGenParameterSpec)params).getName();

                if (this.algorithm.equals("ECGOST3410"))
                {
                    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());
                }
                else
                {
                    X9ECParameters  ecP = X962NamedCurves.getByName(curveName);
                    if (ecP == null)
                    {
                        ecP = SECNamedCurves.getByName(curveName);
                        if (ecP == null)
                        {
                            ecP = NISTNamedCurves.getByName(curveName);
                        }
                        if (ecP == null)
                        {
                            ecP = TeleTrusTNamedCurves.getByName(curveName);
                        }
                        if (ecP == null)
                        {
                            // See if it's actually an OID string (SunJSSE ServerHandshaker setupEphemeralECDHKeys bug)
                            try
                            {
                                DERObjectIdentifier oid = new DERObjectIdentifier(curveName);
                                ecP = X962NamedCurves.getByOID(oid);
                                if (ecP == null)
                                {
                                    ecP = SECNamedCurves.getByOID(oid);
                                }
                                if (ecP == null)
                                {
                                    ecP = NISTNamedCurves.getByOID(oid);
                                }
                                if (ecP == null)
                                {
                                    ecP = TeleTrusTNamedCurves.getByOID(oid);
                                }
                                if (ecP == null)
                                {
                                    throw new InvalidAlgorithmParameterException("unknown curve OID: " + curveName);
                                }
                            }
                            catch (IllegalArgumentException ex)
                            {
                                throw new InvalidAlgorithmParameterException("unknown curve name: " + curveName);
                            }
                        }
                    }

                    this.ecParams = new ECNamedCurveSpec(
                            curveName,
                            ecP.getCurve(),
                            ecP.getG(),
                            ecP.getN(),
                            ecP.getH(),
                            null); // ecP.getSeed());   Work-around JDK bug -- it won't look up named curves properly if seed is present
                }

                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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        {
            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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            {
                java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)params;
                this.ecParams = params;

                ECCurve curve;
                ECPoint g;
                ECField field = p.getCurve().getField();

                if (field instanceof ECFieldFp)
                {
                    curve = new ECCurve.Fp(((ECFieldFp)p.getCurve().getField()).getP(), p.getCurve().getA(), p.getCurve().getB());
                    g = new ECPoint.Fp(curve, new ECFieldElement.Fp(((ECCurve.Fp)curve).getQ(), p.getGenerator().getAffineX()), new ECFieldElement.Fp(((ECCurve.Fp)curve).getQ(), p.getGenerator().getAffineY()));
                }
                else
                {
                    ECFieldF2m fieldF2m = (ECFieldF2m)field;
                    int m = fieldF2m.getM();
                    int ks[] = ECUtil.convertMidTerms(fieldF2m.getMidTermsOfReductionPolynomial());
                    curve = new ECCurve.F2m(m, ks[0], ks[1], ks[2], p.getCurve().getA(), p.getCurve().getB());
                    g = new ECPoint.F2m(curve, new ECFieldElement.F2m(m, ks[0], ks[1], ks[2], p.getGenerator().getAffineX()), new ECFieldElement.F2m(m, ks[0], ks[1], ks[2], p.getGenerator().getAffineY()), 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)
            {
                if (this.algorithm.equals("ECGOST3410"))
                {
                    ECDomainParameters  ecP = ECGOST3410NamedCurves.getByName(((ECGenParameterSpec)params).getName());
                    if (ecP == null)
                    {
                        throw new InvalidAlgorithmParameterException("unknown curve name: " + ((ECGenParameterSpec)params).getName());
                    }

                    this.ecParams = new ECNamedCurveParameterSpec(
                                                    ((ECGenParameterSpec)params).getName(),
                                                    ecP.getCurve(),
                                                    ecP.getG(),
                                                    ecP.getN(),
                                                    ecP.getH(),
                                                    ecP.getSeed());
                }
                else
                {
                    X9ECParameters  ecP = X962NamedCurves.getByName(((ECGenParameterSpec)params).getName());
                    if (ecP == null)
                    {
                        ecP = SECNamedCurves.getByName(((ECGenParameterSpec)params).getName());
                        if (ecP == null)
                        {
                            ecP = NISTNamedCurves.getByName(((ECGenParameterSpec)params).getName());
                        }
                        if (ecP == null)
                        {
                            throw new InvalidAlgorithmParameterException("unknown curve name: " + ((ECGenParameterSpec)params).getName());
                        }
                    }

                    this.ecParams = new ECNamedCurveSpec(
                            ((ECGenParameterSpec)params).getName(),
                            ecP.getCurve(),
                            ecP.getG(),
                            ecP.getN(),
                            ecP.getH(),
                            ecP.getSeed());
                }

                java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)ecParams;
                ECCurve curve;
                ECPoint g;
                ECField field = p.getCurve().getField();

                if (field instanceof ECFieldFp)
                {
                    curve = new ECCurve.Fp(((ECFieldFp)p.getCurve().getField()).getP(), p.getCurve().getA(), p.getCurve().getB());
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        }
        return new ExtendedKey (new ECKeyPair (k, true), r, depth, parent, sequence);
      }
      else
      {
        ECPoint q = curve.getG ().multiply (m).add (curve.getCurve ().decodePoint (pub));
        if ( q.isInfinity () )
        {
          throw new ValidationException ("This is rather unlikely, but it did just happen");
        }
        pub = new ECPoint.Fp (curve.getCurve (), q.getX (), q.getY (), true).getEncoded ();
        return new ExtendedKey (new ECPublicKey (pub, true), r, depth, parent, sequence);
      }
    }
    catch ( NoSuchAlgorithmException e )
    {
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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 = ECAlgorithms.sumOfTwoMultiplies(G, u1, Q, u2);

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

        return v.equals(r);
    }
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  • org.bouncycastle.crypto.ec.ECElGamalDecryptor
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  • org.bouncycastle.crypto.ec.ECNewPublicKeyTransform
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