Example usage for org.bouncycastle.crypto.params ElGamalPrivateKeyParameters ElGamalPrivateKeyParameters

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.params ElGamalPrivateKeyParameters ElGamalPrivateKeyParameters.

Prototype

public ElGamalPrivateKeyParameters(BigInteger x, ElGamalParameters params) 

Source Link

Usage

From source file:net.jradius.client.auth.EAPTLSAuthenticator.java

License:Open Source License

/**
 * Create a private key parameter from the passed in PKCS8 PrivateKeyInfo object.
 * //from  w ww . j a v a 2 s  .c o  m
 * @param keyInfo the PrivateKeyInfo object containing the key material
 * @return a suitable private key parameter
 * @throws IOException on an error decoding the key
 */
public static AsymmetricKeyParameter createKey(PrivateKeyInfo keyInfo) throws IOException {
    AlgorithmIdentifier algId = keyInfo.getAlgorithmId();

    if (algId.getObjectId().equals(PKCSObjectIdentifiers.rsaEncryption)) {
        RSAPrivateKeyStructure keyStructure = new RSAPrivateKeyStructure(
                (ASN1Sequence) keyInfo.getPrivateKey());

        return new RSAPrivateCrtKeyParameters(keyStructure.getModulus(), keyStructure.getPublicExponent(),
                keyStructure.getPrivateExponent(), keyStructure.getPrime1(), keyStructure.getPrime2(),
                keyStructure.getExponent1(), keyStructure.getExponent2(), keyStructure.getCoefficient());
    } else if (algId.getObjectId().equals(PKCSObjectIdentifiers.dhKeyAgreement)) {
        DHParameter params = new DHParameter((ASN1Sequence) keyInfo.getAlgorithmId().getParameters());
        DERInteger derX = (DERInteger) keyInfo.getPrivateKey();

        BigInteger lVal = params.getL();
        int l = lVal == null ? 0 : lVal.intValue();
        DHParameters dhParams = new DHParameters(params.getP(), params.getG(), null, l);

        return new DHPrivateKeyParameters(derX.getValue(), dhParams);
    } else if (algId.getObjectId().equals(OIWObjectIdentifiers.elGamalAlgorithm)) {
        ElGamalParameter params = new ElGamalParameter((ASN1Sequence) keyInfo.getAlgorithmId().getParameters());
        DERInteger derX = (DERInteger) keyInfo.getPrivateKey();

        return new ElGamalPrivateKeyParameters(derX.getValue(),
                new ElGamalParameters(params.getP(), params.getG()));
    } else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_dsa)) {
        DERInteger derX = (DERInteger) keyInfo.getPrivateKey();
        DEREncodable de = keyInfo.getAlgorithmId().getParameters();

        DSAParameters parameters = null;
        if (de != null) {
            DSAParameter params = DSAParameter.getInstance(de.getDERObject());
            parameters = new DSAParameters(params.getP(), params.getQ(), params.getG());
        }

        return new DSAPrivateKeyParameters(derX.getValue(), parameters);
    } else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_ecPublicKey)) {
        X962Parameters params = new X962Parameters((DERObject) keyInfo.getAlgorithmId().getParameters());
        ECDomainParameters dParams = null;

        if (params.isNamedCurve()) {
            DERObjectIdentifier oid = (DERObjectIdentifier) params.getParameters();
            X9ECParameters 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);
                    }
                }
            }

            dParams = new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
        } else {
            X9ECParameters ecP = new X9ECParameters((ASN1Sequence) params.getParameters());
            dParams = new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
        }

        ECPrivateKeyStructure ec = new ECPrivateKeyStructure((ASN1Sequence) keyInfo.getPrivateKey());

        return new ECPrivateKeyParameters(ec.getKey(), dParams);
    } else {
        throw new RuntimeException("algorithm identifier in key not recognised");
    }
}

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From source file:protocol.impl.sigma.ElGamal.java

License:Open Source License

public byte[] decryptWithPrivateKey(byte[] data) {
    ElGamalParameters params = new ElGamalParameters(keys.getP(), keys.getG());
    ElGamalPrivateKeyParameters privKey = new ElGamalPrivateKeyParameters(keys.getPrivateKey(), params);

    ElGamalEngine e = new ElGamalEngine();
    e.init(false, privKey);//w  w w.  ja  v  a  2s  .  co  m

    return e.processBlock(data, 0, data.length);
}

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From source file:util.secure.ElGamal.java

License:Open Source License

@Override
public byte[] decryptWithPrivateKey(byte[] data) {
    ElGamalParameters params = new ElGamalParameters(keys.getP(), keys.getG());
    ElGamalPrivateKeyParameters privKey = new ElGamalPrivateKeyParameters(keys.getPrivateKey(), params);

    ElGamalEngine e = new ElGamalEngine();
    e.init(false, privKey);//  www .j a  v a 2  s  .c o m

    return e.processBlock(data, 0, data.length);
}

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