Package org.bouncycastle.math.ec

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);

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

        return t.equals(e);
    }
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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)
            {
                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 ECNamedCurveSpec(
                                                    ((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)
                        {
                            ecP = TeleTrusTNamedCurves.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 = 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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            return false;
        }

        // compute P = sG + rW

        ECPoint G = pubKey.getParameters().getG();
        ECPoint W = pubKey.getQ();
        // calculate P using Bouncy math
        ECPoint P = G.multiply(s).add(W.multiply(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 = G.multiply(u1).add(Q.multiply(u2));

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

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