Package org.bouncycastle.math.ec

Examples of org.bouncycastle.math.ec.ECPoint

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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 || params instanceof ECNamedCurveGenParameterSpec)
            {
                String curveName;

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

                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
                        {
                            ASN1ObjectIdentifier oid = new ASN1ObjectIdentifier(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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        BigInteger n = key.getParameters().getN();
        BigInteger h = key.getParameters().getH();

        // Generate the ephemeral key pair   
        BigInteger r = BigIntegers.createRandomInRange(ONE, n, rnd);
        ECPoint gTilde = key.getParameters().getG().multiply(r);

        // Encode the ephemeral public key
        byte[] C = gTilde.getEncoded();
        System.arraycopy(C, 0, out, outOff, C.length);

        // Compute the static-ephemeral key agreement
        BigInteger rPrime;
        if (CofactorMode)
        {
            rPrime = r.multiply(h).mod(n);
        }
        else
        {
            rPrime = r;
        }

        ECPoint hTilde = ((ECPublicKeyParameters)key).getQ().multiply(rPrime);

        // Encode the shared secret value
        int PEHlen = (key.getParameters().getCurve().getFieldSize() + 7) / 8;
        byte[] PEH = BigIntegers.asUnsignedByteArray(PEHlen, hTilde.getX().toBigInteger());

        // Initialise the KDF
        byte[] kdfInput;
        if (SingleHashMode)
        {
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        BigInteger h = key.getParameters().getH();

        // Decode the ephemeral public key
        byte[] C = new byte[inLen];
        System.arraycopy(in, inOff, C, 0, inLen);
        ECPoint gTilde = key.getParameters().getCurve().decodePoint(C);

        // Compute the static-ephemeral key agreement
        ECPoint gHat;
        if ((CofactorMode) || (OldCofactorMode))
        {
            gHat = gTilde.multiply(h);
        }
        else
        {
            gHat = gTilde;
        }

        BigInteger xHat;
        if (CofactorMode)
        {
            xHat = ((ECPrivateKeyParameters)key).getD().multiply(h.modInverse(n)).mod(n);
        }
        else
        {
            xHat = ((ECPrivateKeyParameters)key).getD();
        }

        ECPoint hTilde = gHat.multiply(xHat);

        // Encode the shared secret value
        int PEHlen = (key.getParameters().getCurve().getFieldSize() + 7) / 8;
        byte[] PEH = BigIntegers.asUnsignedByteArray(PEHlen, hTilde.getX().toBigInteger());

        // Initialise the KDF
        byte[] kdfInput;
        if (SingleHashMode)
        {
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        }

        BigInteger             n = key.getParameters().getN();
        BigInteger             k = ECUtil.generateK(n, random);

        ECPoint  g = key.getParameters().getG();
        ECPoint  gamma = g.multiply(k);
        ECPoint  phi = key.getQ().multiply(k).add(cipherText.getY());

        return new ECPair(cipherText.getX().add(gamma), phi);
    }
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        }

        BigInteger             n = key.getParameters().getN();
        BigInteger             k = ECUtil.generateK(n, random);

        ECPoint  g = key.getParameters().getG();
        ECPoint  gamma = g.multiply(k);
        ECPoint  phi = key.getQ().multiply(k).add(cipherText.getY());

        return new ECPair(gamma, phi);
    }
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        }

        BigInteger             n = key.getParameters().getN();
        BigInteger             k = ECUtil.generateK(n, random);

        ECPoint  g = key.getParameters().getG();
        ECPoint  gamma = g.multiply(k);
        ECPoint  phi = key.getQ().multiply(k).add(point);

        return new ECPair(gamma, phi);
    }
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        if (key == null)
        {
            throw new IllegalStateException("ECElGamalDecryptor not initialised");
        }

        ECPoint tmp = pair.getX().multiply(key.getD());

        return pair.getY().add(tmp.negate());
    }
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            return false;
        }

        // compute P = sG + rW

        ECPoint G = pubKey.getParameters().getG();
        ECPoint W = pubKey.getQ();
        // calculate P using Bouncy math
        ECPoint P = ECAlgorithms.sumOfTwoMultiplies(G, s, W, r);

        // components must be bogus.
        if (P.isInfinity())
        {
            return false;
        }

        BigInteger x = P.getX().toBigInteger();
        BigInteger t = r.subtract(x).mod(n);

        return t.equals(e);
    }
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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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