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

        private KeyFactory dsakf;


        DSA(PublicKey key) throws KeyException {
            super(key);
            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());
        }

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        try
          {
            pubKey = p[i].getPublicKey();
            if (pubKey instanceof DSAPublicKey)
              {
                DSAParams dsa = ((DSAPublicKey) pubKey).getParams();
                // If the DSA public key is missing its parameters, use those
                // from the previous cert's key.
                if (dsa == null || dsa.getP() == null || dsa.getG() == null
                    || dsa.getQ() == null)
                  {
                    if (prevKey == null)
                      throw new InvalidKeyException("DSA keys not chainable");
                    if (! (prevKey instanceof DSAPublicKey))
                      throw new InvalidKeyException("DSA keys not chainable");
                    dsa = ((DSAPublicKey) prevKey).getParams();
                    pubKey = new DSSPublicKey(Registry.X509_ENCODING_ID,
                                              dsa.getP(), dsa.getQ(),
                                              dsa.getG(),
                                              ((DSAPublicKey) pubKey).getY());
                  }
              }
            if (sigProvider == null)
              p[i - 1].verify(pubKey);

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          {
            if (subjectKey instanceof DSAPublicKey)
              {
                AlgorithmParameters params =
                  AlgorithmParameters.getInstance("DSA");
                DSAParams dsap = ((DSAPublicKey) subjectKey).getParams();
                DSAParameterSpec spec =
                  new DSAParameterSpec(dsap.getP(), dsap.getQ(), dsap.getG());
                params.init(spec);
                sigAlgVal = params.getEncoded();
              }
          }
        else

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                byte[] derBytes = PKCS8Key.encode(seq);
                PKCS8Key pkcs8 = new PKCS8Key(derBytes, null);
                pkcs8DerBytes = pkcs8.getDecryptedBytes();
            } else if (key instanceof DSAPrivateKey) {
                DSAPrivateKey dsa = (DSAPrivateKey) key;
                DSAParams params = dsa.getParams();
                BigInteger g = params.getG();
                BigInteger p = params.getP();
                BigInteger q = params.getQ();
                BigInteger x = dsa.getX();
                BigInteger y = q.modPow(x, p);


                ASN1EncodableVector vec = new ASN1EncodableVector();
                vec.add(new DERInteger(BigInteger.ZERO));

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     * @throws GeneralSecurityException if it didn't work
     */
    public static PublicKey derivePublicKey(PrivateKey key) throws GeneralSecurityException {
        if (key instanceof DSAPrivateKey) {
            DSAPrivateKey dsaKey = (DSAPrivateKey) key;
            DSAParams keyParams = dsaKey.getParams();
            BigInteger g = keyParams.getG();
            BigInteger p = keyParams.getP();
            BigInteger q = keyParams.getQ();
            BigInteger x = dsaKey.getX();
            BigInteger y = q.modPow(x, p);
            DSAPublicKeySpec keySpec = new DSAPublicKeySpec(y, p, q, g);
            return KeyFactory.getInstance("DSA").generatePublic(keySpec);
        } else if (key instanceof RSAPrivateCrtKey) {

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    keyGen.initialize(keySize, new SecureRandom());
    KeyPair pair = keyGen.generateKeyPair();
    _x = ((DSAPrivateKey) pair.getPrivate()).getX().toByteArray();
    _y = ((DSAPublicKey) pair.getPublic()).getY().toByteArray();


    DSAParams params = ((DSAKey) pair.getPrivate()).getParams();
    _p = params.getP().toByteArray();
    _q = params.getQ().toByteArray();
    _g = params.getG().toByteArray();
  }

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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", "BC2");
                return keyFactory.generatePublic(dsaPubKeySpec);
            }

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            bcpgKey = new RSAPublicBCPGKey(rK.getModulus(), rK.getPublicExponent());
        }
        else if (pubKey instanceof DSAPublicKey)
        {
            DSAPublicKey    dK = (DSAPublicKey)pubKey;
            DSAParams       dP = dK.getParams();


            bcpgKey = new DSAPublicBCPGKey(dP.getP(), dP.getQ(), dP.getG(), dK.getY());
        }
        else if (pubKey instanceof ElGamalPublicKey)
        {
            ElGamalPublicKey        eK = (ElGamalPublicKey)pubKey;
            ElGamalParameterSpec    eS = eK.getParameters();

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 * @see org.jclouds.ssh.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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