Example usage for org.bouncycastle.crypto.params DHPrivateKeyParameters getParameters

Introduction

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

Prototype

public DHParameters getParameters() 

Source Link

Usage

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

License:LGPL

/**
 * Generate a DH key pair.//  ww  w  . j a  v  a 2s .c o  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);/* w w w  .  j ava  2  s.  c om*/
    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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