Example usage for javax.crypto.spec DHParameterSpec getG

Introduction

In this page you can find the example usage for javax.crypto.spec DHParameterSpec getG.

Prototype

public BigInteger getG() 

Source Link

Document

Returns the base generator g.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator.getInstance("DH");
    paramGen.init(1024);//from www . jav  a 2s .  c o m

    AlgorithmParameters params = paramGen.generateParameters();
    DHParameterSpec dhSpec = (DHParameterSpec) params.getParameterSpec(DHParameterSpec.class);

    System.out.println("" + dhSpec.getP() + "," + dhSpec.getG() + "," + dhSpec.getL());
}

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From source file:edu.internet2.middleware.openid.message.encoding.EncodingUtils.java

/**
 * Decode a DH public key.//  w w  w .  j av  a  2s  .co  m
 * 
 * @param encodedKey public key to decode
 * @param parameters DH parameters used in decoding
 * @return decoded public key
 * @throws NoSuchAlgorithmException if DH algorithm is unavailable
 * @throws InvalidKeySpecException if unable to build a valid DH key spec
 */
public static DHPublicKey decodePublicKey(String encodedKey, DHParameterSpec parameters)
        throws NoSuchAlgorithmException, InvalidKeySpecException {
    byte[] keyBytes = Base64.decodeBase64(encodedKey.getBytes());
    DHPublicKeySpec keySpec = new DHPublicKeySpec(new BigInteger(keyBytes), parameters.getP(),
            parameters.getG());
    KeyFactory keyFactory = KeyFactory.getInstance("DH");
    return (DHPublicKey) keyFactory.generatePublic(keySpec);
}

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From source file:edu.internet2.middleware.openid.message.encoding.EncodingUtils.java

/**
 * Decode a DH private key./*  ww  w .j  av  a 2 s .  c om*/
 * 
 * @param encodedKey private key to decode
 * @param parameters DH parameters used in decoding
 * @return decoded private key
 * @throws NoSuchAlgorithmException if DH algorithm is unavailable
 * @throws InvalidKeySpecException if unable to build a valid DH key spec
 */
public static DHPrivateKey decodePrivateKey(String encodedKey, DHParameterSpec parameters)
        throws NoSuchAlgorithmException, InvalidKeySpecException {
    byte[] keyBytes = Base64.decodeBase64(encodedKey.getBytes());
    DHPrivateKeySpec keySpec = new DHPrivateKeySpec(new BigInteger(keyBytes), parameters.getP(),
            parameters.getG());
    KeyFactory keyFactory = KeyFactory.getInstance("DH");
    return (DHPrivateKey) keyFactory.generatePrivate(keySpec);
}

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From source file:edu.internet2.middleware.openid.message.impl.AssociationRequestMarshaller.java

/** {@inheritDoc} */
protected void marshallParameters(AssociationRequest request, ParameterMap parameters) {
    parameters.put(Parameter.assoc_type.QNAME, request.getAssociationType().toString());

    SessionType sessionType = request.getSessionType();
    parameters.put(Parameter.session_type.QNAME, sessionType.toString());

    if (sessionType.equals(SessionType.DH_SHA1) || sessionType.equals(SessionType.DH_SHA256)) {

        DHParameterSpec dhParameters = request.getDHParameters();
        if (dhParameters != null) {
            byte[] modulus = Base64.encodeBase64(dhParameters.getP().toByteArray());
            parameters.put(Parameter.dh_modulus.QNAME, new String(modulus));

            byte[] gen = Base64.encodeBase64(dhParameters.getG().toByteArray());
            parameters.put(Parameter.dh_gen.QNAME, new String(gen));

        }// www  .j a va2  s.  com

        DHPublicKey consumerPublic = request.getDHConsumerPublic();
        if (consumerPublic != null) {
            String publicKey = EncodingUtils.encodePublicKey(consumerPublic);
            parameters.put(Parameter.dh_consumer_public.QNAME, publicKey);
        }

    }
}

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From source file:org.apache.abdera2.common.security.DHBase.java

private void init() throws NoSuchAlgorithmException, InvalidAlgorithmParameterException,
        InvalidParameterSpecException, InvalidKeySpecException {
    AlgorithmParameterGenerator pgen = AlgorithmParameterGenerator.getInstance("DH");
    pgen.init(512);/*  www  .j a  v  a 2s. c  o m*/
    AlgorithmParameters params = pgen.generateParameters();
    DHParameterSpec dhspec = (DHParameterSpec) params.getParameterSpec(DHParameterSpec.class);
    KeyPairGenerator keypairgen = KeyPairGenerator.getInstance("DH");
    keypairgen.initialize(dhspec);
    keyPair = keypairgen.generateKeyPair();
    p = dhspec.getP();
    g = dhspec.getG();
    l = dhspec.getL();
}

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