Example usage for java.security.interfaces DSAPrivateKey getX

Introduction

In this page you can find the example usage for java.security.interfaces DSAPrivateKey getX.

Prototype

public BigInteger getX();

Source Link

Document

Returns the value of the private key, x .

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
    keyGen.initialize(1024);//from  w  w w  .  ja  v a 2s  .  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();
}

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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);// w  w  w . java2s  .  c  o  m
    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");

}

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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);/*from   www . j  a va 2  s . c o  m*/
    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);/* w w w. ja  v  a2 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 privateKeySpec = new DSAPrivateKeySpec(x, p, q, g);
    PrivateKey privateKey1 = keyFactory.generatePrivate(privateKeySpec);
}

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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);//  w  w w .  j  a  va  2  s .  c o  m
    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();

    // Create the DSA key factory
    KeyFactory keyFactory = KeyFactory.getInstance("DSA");
    // Create the DSA private key
    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);
}

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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);//  w  ww.  ja  va  2s.  co  m
    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:org.cesecore.keys.util.KeyTools.java

/**
 * Test if a private key is extractable (could be stored).
 * /*from   w w  w .  j  a v  a  2 s  .c om*/
 * @param privK
 *            key to test.
 * @return true if the key is extractable.
 */
public static boolean isPrivateKeyExtractable(final PrivateKey privK) {
    if (privK instanceof RSAPrivateKey) {
        final RSAPrivateKey rsa = (RSAPrivateKey) privK;
        final BigInteger result = rsa.getPrivateExponent();
        return result != null && result.bitLength() > 0;
    }
    if (privK instanceof ECPrivateKey) {
        final ECPrivateKey ec = (ECPrivateKey) privK;
        final BigInteger result = ec.getS();
        return result != null && result.bitLength() > 0;
    }
    if (privK instanceof DHPrivateKey) {
        final DHPrivateKey dh = (DHPrivateKey) privK;
        final BigInteger result = dh.getX();
        return result != null && result.bitLength() > 0;
    }
    if (privK instanceof DSAPrivateKey) {
        final DSAPrivateKey dsa = (DSAPrivateKey) privK;
        final BigInteger result = dsa.getX();
        return result != null && result.bitLength() > 0;
    }
    return false;
}

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From source file:org.opensaml.xml.security.SecurityHelper.java

/**
 * Derives the public key from either a DSA or RSA private key.
 * //from w ww  .  ja  va  2  s.  com
 * @param key the private key to derive the public key from
 * 
 * @return the derived public key
 * 
 * @throws KeyException thrown if the given private key is not a DSA or RSA key or there is a problem generating the
 *             public key
 */
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) {
            throw new KeyException("Unable to derive public key from DSA private key", e);
        }
    } else if (key instanceof RSAPrivateCrtKey) {
        RSAPrivateCrtKey rsaKey = (RSAPrivateCrtKey) key;
        RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(rsaKey.getModulus(), rsaKey.getPublicExponent());

        try {
            factory = KeyFactory.getInstance("RSA");
            return factory.generatePublic(pubKeySpec);
        } catch (GeneralSecurityException e) {
            throw new KeyException("Unable to derive public key from RSA private key", e);
        }
    } else {
        throw new KeyException("Private key was not a DSA or RSA key");
    }
}

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