Examples of java.security.interfaces.DSAParams

java.security.interfaces.DSAParams
Interface to a DSA-specific set of key parameters, which defines a DSA key family. DSA (Digital Signature Algorithm) is defined in NIST's FIPS-186. @see DSAKey @see java.security.Key @see java.security.Signature @version 1.21 05/11/17 @author Benjamin Renaud @author Josh Bloch

        @Override
        void marshalPublicKey(XmlWriter xwriter, DSAPublicKey publicKey, String dsPrefix,
                XMLCryptoContext context)
            throws MarshalException
        {
            DSAParams params = publicKey.getParams();
            
            xwriter.writeStartElement(dsPrefix, "DSAKeyValue", XMLSignature.XMLNS);
            
            // parameters J, Seed & PgenCounter are not included
            writeBase64BigIntegerElement(xwriter, dsPrefix, "P", XMLSignature.XMLNS, params.getP());
            writeBase64BigIntegerElement(xwriter, dsPrefix, "Q", XMLSignature.XMLNS, params.getQ());
            writeBase64BigIntegerElement(xwriter, dsPrefix, "G", XMLSignature.XMLNS, params.getG());
            writeBase64BigIntegerElement(xwriter, dsPrefix, "Y", XMLSignature.XMLNS, publicKey.getY() );
            
            xwriter.writeEndElement(); // "DSAKeyValue"
        }

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            DSAPublicKey prevDSAPubKey = (DSAPublicKey)pubKey;
            if (prevDSAPubKey.getParams() == null)
            {
                continue;
            }
            DSAParams dsaParams = prevDSAPubKey.getParams();
            DSAPublicKeySpec dsaPubKeySpec = new DSAPublicKeySpec(
                dsaPubKey.getY(), dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
            try
            {
                KeyFactory keyFactory = KeyFactory.getInstance("DSA", BouncyCastleProvider.PROVIDER_NAME);
                return keyFactory.generatePublic(dsaPubKeySpec);
            }

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            DSAPublicKey prevDSAPubKey = (DSAPublicKey) pubKey;
            if (prevDSAPubKey.getParams() == null)
            {
                continue;
            }
            DSAParams dsaParams = prevDSAPubKey.getParams();
            DSAPublicKeySpec dsaPubKeySpec = new DSAPublicKeySpec(
                dsaPubKey.getY(), dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
            try
            {
                KeyFactory keyFactory = KeyFactory.getInstance("DSA", "BC");
                return keyFactory.generatePublic(dsaPubKeySpec);
            }

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    protected static boolean areKeyEquals(PublicKey k1, PublicKey k2) {
        if (k1 instanceof DSAPublicKey && k2 instanceof DSAPublicKey) {
            DSAPublicKey d1 = (DSAPublicKey) k1;
            DSAPublicKey d2 = (DSAPublicKey) k2;
            DSAParams p1 = d1.getParams();
            DSAParams p2 = d2.getParams();
            return d1.getY().equals(d2.getY())
                        && p1.getG().equals(p2.getG())
                        && p1.getP().equals(p2.getP())
                        && p1.getQ().equals(p2.getQ());
        } else if (k1 instanceof ECPublicKey && k2 instanceof ECPublicKey) {
            ECPublicKey e1 = (ECPublicKey) k1;
            ECPublicKey e2 = (ECPublicKey) k2;
            ECParameterSpec p1 = e1.getParams();
            ECParameterSpec p2 = e2.getParams();
            return p1.getCofactor() == p2.getCofactor()
                        && p1.getOrder().equals(p2.getOrder())
                        && e1.getW().equals(e2.getW())
                        && p1.getGenerator().equals(p2.getGenerator())
                        && p1.getCurve().equals(p2.getCurve());
        } else if (k1 instanceof RSAPublicKey && k2 instanceof RSAPublicKey) {
            RSAPublicKey r1 = (RSAPublicKey) k1;
            RSAPublicKey r2 = (RSAPublicKey) k2;
            return r1.getModulus().equals(r2.getModulus())
                        && r1.getPublicExponent().equals(r2.getPublicExponent());

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        BigInteger gComponent = keyDescriptor.getG().getValueBigInt();
        BigInteger pComponent = keyDescriptor.getP().getValueBigInt();
        BigInteger qComponent = keyDescriptor.getQ().getValueBigInt();


        DSAParams  dsaParams = new DSAParameterSpec(pComponent, qComponent, gComponent);
        return getDSAKey(keyDescriptor, dsaParams);
    }

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     */
    public static PublicKey derivePublicKey(PrivateKey key) throws KeyException {
        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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 * @see SshKeys
 */
public class DSAKeys {


   public static String encodeAsOpenSSH(DSAPublicKey key) {
      DSAParams params = key.getParams();
      byte[] keyBlob = keyBlob(params.getP(), params.getQ(), params.getG(), key.getY());
      return "ssh-dss " + base64().encode(keyBlob);
   }

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      throw new NullPointerException("key cannot be null");
  }
  this.publicKey = key;
  if (key instanceof DSAPublicKey) {
      DSAPublicKey dkey = (DSAPublicKey) key;
      DSAParams params = dkey.getParams();
      p = new DOMCryptoBinary(params.getP());
      q = new DOMCryptoBinary(params.getQ());
      g = new DOMCryptoBinary(params.getG());
      y = new DOMCryptoBinary(dkey.getY());
  } else if (key instanceof RSAPublicKey) {
      RSAPublicKey rkey = (RSAPublicKey) key;
      exponent = new DOMCryptoBinary(rkey.getPublicExponent());
      modulus = new DOMCryptoBinary(rkey.getModulus());

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      throw new NullPointerException("key cannot be null");
  }
  this.publicKey = key;
  if (key instanceof DSAPublicKey) {
      DSAPublicKey dkey = (DSAPublicKey) key;
      DSAParams params = dkey.getParams();
      p = new DOMCryptoBinary(params.getP());
      q = new DOMCryptoBinary(params.getQ());
      g = new DOMCryptoBinary(params.getG());
      y = new DOMCryptoBinary(dkey.getY());
  } else if (key instanceof RSAPublicKey) {
      RSAPublicKey rkey = (RSAPublicKey) key;
      exponent = new DOMCryptoBinary(rkey.getPublicExponent());
      modulus = new DOMCryptoBinary(rkey.getModulus());

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     *    InvalidKeyException if privateKey is not DSAPrivateKey object
     */
    protected void engineInitSign(PrivateKey privateKey)
            throws InvalidKeyException {


        DSAParams params;


        // parameters and private key
        BigInteger p, q, g, x;


        int n;


        if (privateKey == null || !(privateKey instanceof DSAPrivateKey)) {
            throw new InvalidKeyException(
                    Messages.getString("security.168")); //$NON-NLS-1$
        }


        params = ((DSAPrivateKey) privateKey).getParams();
        p = params.getP();
        q = params.getQ();
        g = params.getG();
        x = ((DSAPrivateKey) privateKey).getX();


        // checks described in DSA standard
        n = p.bitLength();
        if (p.compareTo(BigInteger.valueOf(1)) != 1 || n < 512 || n > 1024

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