Examples of java.security.spec.DSAPublicKeySpec

java.security.spec.DSAPublicKeySpec
This class specifies a DSA public key with its associated parameters. @author Jan Luehe @version 1.19, 11/17/05 @see java.security.Key @see java.security.KeyFactory @see KeySpec @see DSAPrivateKeySpec @see X509EncodedKeySpec @since 1.2

    
    public static DSAKeyValue getDSAKeyValue(
    Document doc, X509Certificate cert) throws XWSSecurityException {
        try {
            KeyFactory keyFactory = KeyFactory.getInstance("DSA");
            DSAPublicKeySpec dsaPkSpec =
            (DSAPublicKeySpec) keyFactory.getKeySpec(
            cert.getPublicKey(), DSAPublicKeySpec.class);
            return
            new DSAKeyValue(
            doc,
            dsaPkSpec.getP(),
            dsaPkSpec.getQ(),
            dsaPkSpec.getG(),
            dsaPkSpec.getY());
            
        } catch (Exception e) {
            logger.log(Level.SEVERE,LogStringsMessages.WSS_0426_FAILED_DSA_KEY_VALUE(), e);
            throw new XWSSecurityException(e);
        }

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        byte[] q = k.readBlob();
        byte[] g = k.readBlob();
        byte[] y = k.readBlob();


        KeyFactory keyFactory = KeyFactory.getInstance("DSA");
        publicKey = new DssSshPublicKey((DSAPublicKey) keyFactory.generatePublic(new DSAPublicKeySpec(new BigInteger(y), new BigInteger(p), new BigInteger(q), new BigInteger(g))));
      } else {
        throw new IOException("Unknown algorithm: " + publicKeyAlgorithm);
      }
      // l.get(2) ignored (comment)
    }

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    byte[] g = packet.readBlob();
    byte[] f = packet.readBlob();


    Signature signature = Signature.getInstance("SHA1withDSA");
    KeyFactory keyFactory = KeyFactory.getInstance("DSA");
    DSAPublicKeySpec dsaPubKeySpec = new DSAPublicKeySpec(new BigInteger(f), new BigInteger(p),
           new BigInteger(q),
           new BigInteger(g));
    PublicKey pubKey = keyFactory.generatePublic(dsaPubKeySpec);
    signature.initVerify(pubKey);
    signature.update(H);

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        KeyFactory factory;
        if (key instanceof DSAPrivateKey) {
            DSAPrivateKey dsaKey = (DSAPrivateKey) key;
            DSAParams keyParams = dsaKey.getParams();
            BigInteger y = keyParams.getQ().modPow(dsaKey.getX(), keyParams.getP());
            DSAPublicKeySpec pubKeySpec = new DSAPublicKeySpec(y, keyParams.getP(), keyParams.getQ(), keyParams.getG());


            try {
                factory = KeyFactory.getInstance("DSA");
                return factory.generatePublic(pubKeySpec);
            } catch (GeneralSecurityException e) {

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     *             contain valid information
     */
    public static PublicKey getDSAKey(DSAKeyValue keyDescriptor, DSAParams dsaParams) throws KeyException {
        BigInteger yComponent = keyDescriptor.getY().getValueBigInt();


        DSAPublicKeySpec keySpec = 
            new DSAPublicKeySpec(yComponent, dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
        return buildKey(keySpec, "DSA");
    }

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   /** @inheritDoc */
   public PublicKey getPublicKey() throws XMLSecurityException {


      try {
         DSAPublicKeySpec pkspec =
            new DSAPublicKeySpec(this
               .getBigIntegerFromChildElement(Constants._TAG_Y, Constants
               .SignatureSpecNS), this
                  .getBigIntegerFromChildElement(Constants._TAG_P, Constants
                  .SignatureSpecNS), this
                     .getBigIntegerFromChildElement(Constants._TAG_Q, Constants

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                curElem = DOMUtils.getNextSiblingElement(curElem);
                pgen = new DOMCryptoBinary(curElem.getFirstChild());
            }
            */
            //@@@ do we care about j, pgenCounter or seed?
            DSAPublicKeySpec spec = new DSAPublicKeySpec(y.getBigNum(),
                                                         p.getBigNum(),
                                                         q.getBigNum(),
                                                         g.getBigNum());
            return generatePublicKey(dsakf, spec);
        }

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            throws InvalidKeySpecException, NoSuchAlgorithmException {
        KeyFactory kf = KeyFactory.getInstance(algo);
        KeySpec kspec = null;
        if (algo.equalsIgnoreCase("DSA")) {
            if (number == 15) {
                kspec = new DSAPublicKeySpec(new BigInteger(DSA_Y_15),
                        new BigInteger(DSA_P_15),
                        new BigInteger(DSA_Q_15),
                        new BigInteger(DSA_G_15));
            } else if (number == 23) {
                kspec = new DSAPublicKeySpec(new BigInteger(DSA_Y_23),
                        new BigInteger(DSA_P_23),
                        new BigInteger(DSA_Q_23),
                        new BigInteger(DSA_G_23));
            }
        } else if (algo.equalsIgnoreCase("RSA")) {

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        throws InvalidKeySpecException, NoSuchAlgorithmException {
        KeyFactory kf = KeyFactory.getInstance(algo);
        KeySpec kspec;
        if (algo.equalsIgnoreCase("DSA")) {
            if (keysize == 1024) {
                kspec = new DSAPublicKeySpec(new BigInteger(DSA_Y), 
                                             new BigInteger(DSA_P), 
                                             new BigInteger(DSA_Q), 
                                             new BigInteger(DSA_G));
            } else if (keysize == 2048) {
                kspec = new DSAPublicKeySpec(new BigInteger(DSA_2048_Y), 
                                             new BigInteger(DSA_2048_P), 
                                             new BigInteger(DSA_2048_Q), 
                                             new BigInteger(DSA_2048_G));
            } else throw new RuntimeException("Unsupported keysize:" + keysize);
        } else if (algo.equalsIgnoreCase("RSA")) {

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    /**
     * Test for <code>getY</code> method 
     */
    public final void testGetY() {
        DSAPublicKeySpec dpks = new DSAPublicKeySpec(
                new BigInteger("1"), // y
                new BigInteger("2"), // p
                new BigInteger("3"), // q
                new BigInteger("4"));// g
        
        assertEquals(1, dpks.getY().intValue());
    }

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