Example usage for org.bouncycastle.crypto.params DHParameters getG

Introduction

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

Prototype

public BigInteger getG() 

Source Link

Usage

From source file:com.licel.jcardsim.crypto.DHKeyImpl.java

License:Apache License

public void setParameters(CipherParameters params) {
    DHParameters dhParam = (DHParameters) params;
    g.setBigInteger(dhParam.getG());
    p.setBigInteger(dhParam.getP());/*from  w w w. j  a  va 2 s.  c o m*/
    if (dhParam.getQ() != null) {
        q.setBigInteger(dhParam.getQ());
    }
}

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From source file:de.tsenger.animamea.pace.PaceDH.java

License:Open Source License

public PaceDH(DHParameters dhParameters) {
    g = dhParameters.getG();
    p = dhParameters.getP();/*from w  w w . j  av  a  2  s . co  m*/
    Random rnd = new Random();
    randomGenerator.setSeed(rnd.nextLong());
}

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From source file:net.java.otr4j.crypto.DHKeyPairOTR3.java

License:LGPL

/**
 * Generate a DH key pair.//w w  w  .j  av  a2s.  co  m
 *
 * @param random the SecureRandom instance
 * @return Returns the DH key pair.
 */
@Nonnull
public static DHKeyPairOTR3 generateDHKeyPair(final SecureRandom random) {

    // Generate a AsymmetricCipherKeyPair using BC.
    final DHParameters dhParams = new DHParameters(MODULUS, GENERATOR, null, DH_PRIVATE_KEY_MINIMUM_BIT_LENGTH);
    final DHKeyGenerationParameters params = new DHKeyGenerationParameters(random, dhParams);
    final DHKeyPairGenerator kpGen = new DHKeyPairGenerator();
    kpGen.init(params);
    final KeyFactory keyFac;
    try {
        keyFac = KeyFactory.getInstance(KF_DH);
    } catch (final NoSuchAlgorithmException ex) {
        throw new IllegalStateException("DH key factory unavailable.", ex);
    }

    final AsymmetricCipherKeyPair pair = kpGen.generateKeyPair();
    final DHPublicKeyParameters pub = convertToPublicKeyParams(pair.getPublic());
    final DHPublicKeySpec pubKeySpecs = new DHPublicKeySpec(pub.getY(), MODULUS, GENERATOR);
    final DHPublicKey pubKey;
    try {
        pubKey = (DHPublicKey) keyFac.generatePublic(pubKeySpecs);
    } catch (final InvalidKeySpecException ex) {
        throw new IllegalStateException("Failed to generate DH public key.", ex);
    }

    final DHPrivateKeyParameters priv = convertToPrivateKeyParams(pair.getPrivate());
    final DHParameters dhParameters = priv.getParameters();
    final DHPrivateKeySpec privKeySpecs = new DHPrivateKeySpec(priv.getX(), dhParameters.getP(),
            dhParameters.getG());
    final DHPrivateKey privKey;
    try {
        privKey = (DHPrivateKey) keyFac.generatePrivate(privKeySpecs);
    } catch (final InvalidKeySpecException ex) {
        throw new IllegalStateException("Failed to generate DH private key.", ex);
    }

    return new DHKeyPairOTR3(privKey, pubKey);
}

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From source file:net.java.otr4j.crypto.OtrCryptoEngineImpl.java

License:Apache License

@Override
public KeyPair generateDHKeyPair() throws OtrCryptoException {

    // Generate a AsymmetricCipherKeyPair using BC.
    DHParameters dhParams = new DHParameters(MODULUS, GENERATOR, null, DH_PRIVATE_KEY_MINIMUM_BIT_LENGTH);
    DHKeyGenerationParameters params = new DHKeyGenerationParameters(new SecureRandom(), dhParams);
    DHKeyPairGenerator kpGen = new DHKeyPairGenerator();

    kpGen.init(params);/* www  .j  a  v a2s.  c o m*/
    AsymmetricCipherKeyPair pair = kpGen.generateKeyPair();

    // Convert this AsymmetricCipherKeyPair to a standard JCE KeyPair.
    DHPublicKeyParameters pub = (DHPublicKeyParameters) pair.getPublic();
    DHPrivateKeyParameters priv = (DHPrivateKeyParameters) pair.getPrivate();

    try {
        KeyFactory keyFac = KeyFactory.getInstance("DH");

        DHPublicKeySpec pubKeySpecs = new DHPublicKeySpec(pub.getY(), MODULUS, GENERATOR);
        DHPublicKey pubKey = (DHPublicKey) keyFac.generatePublic(pubKeySpecs);

        DHParameters dhParameters = priv.getParameters();
        DHPrivateKeySpec privKeySpecs = new DHPrivateKeySpec(priv.getX(), dhParameters.getP(),
                dhParameters.getG());
        DHPrivateKey privKey = (DHPrivateKey) keyFac.generatePrivate(privKeySpecs);

        return new KeyPair(pubKey, privKey);
    } catch (Exception e) {
        throw new OtrCryptoException(e);
    }
}

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From source file:org.fejoa.library.crypto.AuthProtocolEKE2_SHA3_256_CTR.java

License:Open Source License

private AuthProtocolEKE2_SHA3_256_CTR(String encGroup, byte[] secret)
        throws CryptoException, InvalidKeySpecException, NoSuchAlgorithmException {
    DHParameters parameters;
    switch (encGroup) {
    case RFC5114_2048_256: {
        parameters = DHStandardGroups.rfc5114_2048_256;
        break;/*from   w  w w .j a  v  a 2  s.  co  m*/
    }

    default:
        throw new CryptoException("Unsupported group: " + encGroup);
    }
    g = parameters.getG();
    p = parameters.getP();

    symmetric = CryptoSettings.getDefault().symmetric;
    // Note: no padding might be important to prevent some attacks(?)
    symmetric.algorithm = "AES/CTR/NoPadding";
    symmetric.keyType = "AES";
    symmetric.keySize = 256;
    symmetric.ivSize = 16 * 8;

    this.secretKey = CryptoHelper.secretKey(secret, symmetric);
}

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From source file:org.jmrtd.Util.java

License:Open Source License

public static DHParameterSpec toExplicitDHParameterSpec(DHParameters params) {
    BigInteger p = params.getP();
    BigInteger generator = params.getG();
    int order = (int) params.getL();
    return new DHParameterSpec(p, generator, order);
}

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From source file:org.xwiki.crypto.internal.asymmetric.generator.BcDHKeyParameterGenerator.java

License:Open Source License

@Override
public KeyGenerationParameters generate(KeyParametersGenerationParameters parameters) {
    if (!(parameters instanceof DHKeyParametersGenerationParameters)) {
        throw new IllegalArgumentException(
                "Invalid parameters for DH key parameters generator: " + parameters.getClass().getName());
    }/*from   w  w  w.jav  a 2s.  com*/

    org.bouncycastle.crypto.params.DHParameters dhParams = getDhParameters(random.get(),
            (DHKeyParametersGenerationParameters) parameters);

    org.bouncycastle.crypto.params.DHValidationParameters dhValidParams = dhParams.getValidationParameters();

    return new DHKeyGenerationParameters(dhParams.getP(), dhParams.getG(), dhParams.getQ(), dhParams.getM() / 8,
            dhParams.getL() / 8, dhParams.getJ(),
            ((dhValidParams != null)
                    ? new DHKeyValidationParameters(dhValidParams.getSeed(), dhValidParams.getCounter())
                    : null));
}

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