Package org.bouncycastle2.math.ec

Examples of org.bouncycastle2.math.ec.ECPoint

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                {
                    k = new BigInteger(n.bitLength(), random);
                }
                while (k.equals(ECConstants.ZERO));

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

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

                r = x.mod(n);
            }
            while (r.equals(ECConstants.ZERO));
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        BigInteger v = e.modInverse(n);

        BigInteger z1 = s.multiply(v).mod(n);
        BigInteger z2 = (n.subtract(r)).multiply(v).mod(n);

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

        ECPoint point = ECAlgorithms.sumOfTwoMultiplies(G, z1, Q, z2);

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

        return R.equals(r);
    }
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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);

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

        return t.equals(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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        {
            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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    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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    {
        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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Related Classes of org.bouncycastle2.math.ec.ECPoint

  • org.bouncycastle2.asn1.ASN1InputStream
  • org.bouncycastle2.asn1.ASN1Sequence
  • org.bouncycastle2.asn1.cryptopro.GOST3410PublicKeyAlgParameters
  • org.bouncycastle2.asn1.DERObjectIdentifier
  • org.bouncycastle2.asn1.DEROctetString
  • org.bouncycastle2.asn1.pkcs.RSAPrivateKeyStructure
  • org.bouncycastle2.asn1.x509.RSAPublicKeyStructure
  • org.bouncycastle2.bcpg.sig.PreferredAlgorithms
  • org.bouncycastle2.crypto.agreement.ECMQVBasicAgreement
  • org.bouncycastle2.crypto.BufferedBlockCipher
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