Example usage for java.security.spec DSAPublicKeySpec DSAPublicKeySpec

Introduction

In this page you can find the example usage for java.security.spec DSAPublicKeySpec DSAPublicKeySpec.

Prototype

public DSAPublicKeySpec(BigInteger y, BigInteger p, BigInteger q, BigInteger g) 

Source Link

Document

Creates a new DSAPublicKeySpec with the specified parameter values.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
    keyGen.initialize(1024);//from www . java  2  s. com
    KeyPair keypair = keyGen.genKeyPair();
    DSAPrivateKey privateKey = (DSAPrivateKey) keypair.getPrivate();
    DSAPublicKey publicKey = (DSAPublicKey) keypair.getPublic();

    DSAParams dsaParams = privateKey.getParams();
    BigInteger p = dsaParams.getP();
    BigInteger q = dsaParams.getQ();
    BigInteger g = dsaParams.getG();
    BigInteger x = privateKey.getX();
    BigInteger y = publicKey.getY();

    KeyFactory keyFactory = KeyFactory.getInstance("DSA");
    KeySpec publicKeySpec = new DSAPublicKeySpec(y, p, q, g);
    PublicKey publicKey1 = keyFactory.generatePublic(publicKeySpec);
}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
    keyGen.initialize(1024);//ww  w.  ja va2  s . c  om
    KeyPair keypair = keyGen.genKeyPair();
    DSAPrivateKey privateKey = (DSAPrivateKey) keypair.getPrivate();
    DSAPublicKey publicKey = (DSAPublicKey) keypair.getPublic();

    DSAParams dsaParams = privateKey.getParams();
    BigInteger p = dsaParams.getP();
    BigInteger q = dsaParams.getQ();
    BigInteger g = dsaParams.getG();
    BigInteger x = privateKey.getX();
    BigInteger y = publicKey.getY();

    KeyFactory keyFactory = KeyFactory.getInstance("DSA");
    KeySpec publicKeySpec = new DSAPublicKeySpec(y, p, q, g);
    PublicKey publicKey1 = keyFactory.generatePublic(publicKeySpec);
    KeySpec privateKeySpec = new DSAPrivateKeySpec(x, p, q, g);
    PrivateKey privateKey1 = keyFactory.generatePrivate(privateKeySpec);

    byte[] buffer = new byte[1024];

    Signature sig = Signature.getInstance(privateKey1.getAlgorithm());
    sig.initSign(privateKey1);
    sig.update(buffer, 0, buffer.length);

    byte[] signature = sig.sign();

    sig = Signature.getInstance(publicKey1.getAlgorithm());
    sig.initVerify(publicKey1);
    sig.update(buffer, 0, buffer.length);
    sig.verify(signature);

}

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From source file:MainClass.java

public static void main(String args[]) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
    random.setSeed(101L);//from   w  w  w  .  java 2 s .  c o m
    keyGen.initialize(1024, random);
    KeyPair keypair = keyGen.generateKeyPair();

    KeyFactory kfactory = KeyFactory.getInstance("DSA");

    DSAPublicKeySpec kspec = (DSAPublicKeySpec) kfactory.getKeySpec(keypair.getPublic(),
            DSAPublicKeySpec.class);

    System.out.println(keypair.getPublic());
    FileOutputStream fos = new FileOutputStream("publicKeys");
    ObjectOutputStream oos = new ObjectOutputStream(fos);

    oos.writeObject(kspec.getY());
    oos.writeObject(kspec.getP());
    oos.writeObject(kspec.getQ());
    oos.writeObject(kspec.getG());

    FileInputStream fin = new FileInputStream("publicKeys");
    ObjectInputStream ois = new ObjectInputStream(fin);

    BigInteger Y = (BigInteger) ois.readObject();
    BigInteger P = (BigInteger) ois.readObject();
    BigInteger Q = (BigInteger) ois.readObject();
    BigInteger G = (BigInteger) ois.readObject();

    DSAPublicKeySpec keyspec = new DSAPublicKeySpec(Y, P, Q, G);
    PublicKey pkey = kfactory.generatePublic(keyspec);
    System.out.println(pkey);
}

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From source file:me.brjannc.plugins.sushi.AuthorizedKeysDecoder.java

public PublicKey decodePublicKey(String keyLine) throws Exception {
    bytes = null;/*from ww  w.j a va  2 s . co  m*/
    pos = 0;

    // look for the Base64 encoded part of the line to decode
    // both ssh-rsa and ssh-dss begin with "AAAA" due to the length bytes
    for (String part : keyLine.split(" ")) {
        if (part.startsWith("AAAA")) {
            bytes = Base64.decodeBase64(part);
            break;
        }
    }
    if (bytes == null) {
        throw new IllegalArgumentException("no Base64 part to decode");
    }

    String type = decodeType();
    if (type.equals("ssh-rsa")) {
        BigInteger e = decodeBigInt();
        BigInteger m = decodeBigInt();
        RSAPublicKeySpec spec = new RSAPublicKeySpec(m, e);
        return KeyFactory.getInstance("RSA").generatePublic(spec);
    } else if (type.equals("ssh-dss")) {
        BigInteger p = decodeBigInt();
        BigInteger q = decodeBigInt();
        BigInteger g = decodeBigInt();
        BigInteger y = decodeBigInt();
        DSAPublicKeySpec spec = new DSAPublicKeySpec(y, p, q, g);
        return KeyFactory.getInstance("DSA").generatePublic(spec);
    } else {
        throw new IllegalArgumentException("unknown type " + type);
    }
}

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From source file:com.adito.security.pki.dsa.SshDssPublicKey.java

/**
 * Creates a new SshDssPublicKey object.
 *
 * @param key/* w  ww.jav a 2s. c om*/
 *
 * @throws InvalidKeyException
 */
public SshDssPublicKey(byte[] key) throws InvalidKeyException {
    try {
        DSAPublicKeySpec dsaKey;

        // Extract the key information
        ByteArrayReader bar = new ByteArrayReader(key);
        String header = bar.readString();

        if (!header.equals(getAlgorithmName())) {
            throw new InvalidKeyException();
        }

        BigInteger p = bar.readBigInteger();
        BigInteger q = bar.readBigInteger();
        BigInteger g = bar.readBigInteger();
        BigInteger y = bar.readBigInteger();
        dsaKey = new DSAPublicKeySpec(y, p, q, g);

        KeyFactory kf = KeyFactory.getInstance("DSA");

        pubkey = (DSAPublicKey) kf.generatePublic(dsaKey);
    } catch (Exception e) {
        throw new InvalidKeyException();
    }
}

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From source file:com.sshtools.j2ssh.transport.publickey.dsa.SshDssPublicKey.java

/**
 * Creates a new SshDssPublicKey object.
 *
 * @param key//from  w w  w  .  j  av a 2  s . c  om
 *
 * @throws InvalidSshKeyException
 */
public SshDssPublicKey(byte[] key) throws InvalidSshKeyException {
    try {
        DSAPublicKeySpec dsaKey;

        // Extract the key information
        ByteArrayReader bar = new ByteArrayReader(key);

        String header = bar.readString();

        if (!header.equals(getAlgorithmName())) {
            throw new InvalidSshKeyException();
        }

        BigInteger p = bar.readBigInteger();
        BigInteger q = bar.readBigInteger();
        BigInteger g = bar.readBigInteger();
        BigInteger y = bar.readBigInteger();

        dsaKey = new DSAPublicKeySpec(y, p, q, g);

        KeyFactory kf = KeyFactory.getInstance("DSA");
        pubkey = (DSAPublicKey) kf.generatePublic(dsaKey);
    } catch (Exception e) {
        throw new InvalidSshKeyException();
    }
}

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From source file:com.adito.security.pki.dsa.SshDssPrivateKey.java

/**
 *
 *
 * @return/* w  w  w  .  ja v a 2  s  . co m*/
 */
public SshPublicKey getPublicKey() {
    try {
        DSAPublicKeySpec spec = new DSAPublicKeySpec(getY(), prvkey.getParams().getP(),
                prvkey.getParams().getQ(), prvkey.getParams().getG());
        KeyFactory kf = KeyFactory.getInstance("DSA");

        return new SshDssPublicKey((DSAPublicKey) kf.generatePublic(spec));
    } catch (Exception e) {
        return null;
    }
}

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From source file:com.sshtools.j2ssh.transport.publickey.dsa.SshDssPrivateKey.java

/**
 *
 *
 * @return//  w ww  . j  ava  2 s . c o  m
 */
public SshPublicKey getPublicKey() {
    try {
        DSAPublicKeySpec spec = new DSAPublicKeySpec(getY(), prvkey.getParams().getP(),
                prvkey.getParams().getQ(), prvkey.getParams().getG());

        KeyFactory kf = KeyFactory.getInstance("DSA");

        return new SshDssPublicKey((DSAPublicKey) kf.generatePublic(spec));
    } catch (Exception e) {
        return null;
    }
}

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From source file:net.adamcin.httpsig.testutil.KeyTestUtil.java

public static KeyPair getKeyPairFromProperties(String parentName, String keyName) {
    InputStream is = null;/*from w  w w .j  av a  2  s. com*/
    try {
        is = KeyTestUtil.class.getResourceAsStream("/" + parentName + "/" + keyName + ".properties");
        Properties props = new Properties();
        props.load(is);
        if (TYPE_RSA.equals(props.getProperty(P_TYPE))) {
            RSAPrivateKeySpec privSpec = null;
            if (props.getProperty(RSA_P) != null && props.getProperty(RSA_Q) != null
                    && props.getProperty(RSA_U) != null) {
                privSpec = new RSAPrivateCrtKeySpec(new BigInteger(props.getProperty(RSA_N)),
                        new BigInteger(props.getProperty(RSA_E)), new BigInteger(props.getProperty(RSA_D)),
                        new BigInteger(props.getProperty(RSA_P)), new BigInteger(props.getProperty(RSA_Q)),
                        new BigInteger(props.getProperty(RSA_PE)), new BigInteger(props.getProperty(RSA_QE)),
                        new BigInteger(props.getProperty(RSA_U)));
            } else {
                privSpec = new RSAPrivateKeySpec(new BigInteger(props.getProperty(RSA_N)),
                        new BigInteger(props.getProperty(RSA_D)));
            }
            RSAPublicKeySpec pubSpec = new RSAPublicKeySpec(new BigInteger(props.getProperty(RSA_N)),
                    new BigInteger(props.getProperty(RSA_E)));

            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            return new KeyPair(keyFactory.generatePublic(pubSpec), keyFactory.generatePrivate(privSpec));
        } else if (TYPE_DSA.equals(props.getProperty(P_TYPE))) {
            DSAPrivateKeySpec privSpec = new DSAPrivateKeySpec(new BigInteger(props.getProperty(DSA_X)),
                    new BigInteger(props.getProperty(DSA_P)), new BigInteger(props.getProperty(DSA_Q)),
                    new BigInteger(props.getProperty(DSA_G)));
            DSAPublicKeySpec pubSpec = new DSAPublicKeySpec(new BigInteger(props.getProperty(DSA_Y)),
                    new BigInteger(props.getProperty(DSA_P)), new BigInteger(props.getProperty(DSA_Q)),
                    new BigInteger(props.getProperty(DSA_G)));
            KeyFactory keyFactory = KeyFactory.getInstance("DSA");
            return new KeyPair(keyFactory.generatePublic(pubSpec), keyFactory.generatePrivate(privSpec));
        }
    } catch (Exception e) {
        LOGGER.error("Failed to read properties", e);
    } finally {
        IOUtils.closeQuietly(is);
    }

    return null;
}

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From source file:com.bitdubai.fermat_api.layer.all_definition.crypto.asymmetric.util.PublicKeyReaderUtil.java

/**
 * <p>Decodes a DSA public key according to the SSH standard from the
 * data <code>_buffer</code> based on <b>NIST's FIPS-186</b>. The values of
 * the DSA public key specification are read in the order
 * <ul>//  w w  w.  j a  v  a 2  s. co m
 * <li>prime p</li>
 * <li>sub-prime q</li>
 * <li>base g</li>
 * <li>public key y</li>
 * </ul>
 * With the specification the related DSA public key is generated.</p>
 *
 * @param _buffer   SSH2 data buffer where the type of the key is already
 *                  read
 * @return DSA public key instance
 * @throws PublicKeyParseException if the SSH2 public key blob could not be
 *                                 decoded
 * @see DSAPublicKeySpec
 * @see <a href="http://en.wikipedia.org/wiki/Digital_Signature_Algorithm">Digital Signature Algorithm  on Wikipedia</a>
 * @see <a href="http://tools.ietf.org/html/rfc4253#section-6.6">RFC 4253 Section 6.6</a>
 */
private static PublicKey decodeDSAPublicKey(final SSH2DataBuffer _buffer) throws PublicKeyParseException {
    final BigInteger p = _buffer.readMPint();
    final BigInteger q = _buffer.readMPint();
    final BigInteger g = _buffer.readMPint();
    final BigInteger y = _buffer.readMPint();

    try {
        final KeyFactory dsaKeyFact = KeyFactory.getInstance("DSA");
        final DSAPublicKeySpec dsaPubSpec = new DSAPublicKeySpec(y, p, q, g);

        return dsaKeyFact.generatePublic(dsaPubSpec);

    } catch (final Exception e) {
        throw new PublicKeyParseException(
                PublicKeyParseException.ErrorCode.SSH2DSA_ERROR_DECODING_PUBLIC_KEY_BLOB, e);
    }
}

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