Examples of ECPoint

Examples of org.bouncycastle.math.ec.ECPoint

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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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Examples of org.bouncycastle.math.ec.ECPoint

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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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Examples of org.bouncycastle.math.ec.ECPoint

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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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Examples of org.bouncycastle.math.ec.ECPoint

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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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Examples of org.bouncycastle.math.ec.ECPoint

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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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Examples of org.bouncycastle.math.ec.ECPoint

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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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Examples of org.bouncycastle.math.ec.ECPoint

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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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Examples of org.bouncycastle.math.ec.ECPoint

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

                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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Examples of org.bouncycastle.math.ec.ECPoint

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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);

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

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

        return v.equals(r);
    }
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Examples of org.bouncycastle.math.ec.ECPoint

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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);
            ECDomainParameters ecP = DSTU4145NamedCurves.getByOID(new ASN1ObjectIdentifier(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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