Examples with DSAPublicKeySpec java.security.spec.DSAPublicKeySpec used on opensource projects

Example 46 with DSAPublicKeySpec

use of java.security.spec.DSAPublicKeySpec in project remote-desktop-clients by iiordanov.

the class PubkeyUtils method recoverKeyPair.

public static KeyPair recoverKeyPair(byte[] encoded) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException {
    KeySpec privKeySpec = new PKCS8EncodedKeySpec(encoded);
    KeySpec pubKeySpec;
    PrivateKey priv;
    PublicKey pub;
    KeyFactory kf;
    try {
        kf = KeyFactory.getInstance(PubkeyDatabase.KEY_TYPE_RSA, "BC");
        priv = kf.generatePrivate(privKeySpec);
        pubKeySpec = new RSAPublicKeySpec(((RSAPrivateCrtKey) priv).getModulus(), ((RSAPrivateCrtKey) priv).getPublicExponent());
        pub = kf.generatePublic(pubKeySpec);
    } catch (ClassCastException e) {
        kf = KeyFactory.getInstance(PubkeyDatabase.KEY_TYPE_DSA, "BC");
        priv = kf.generatePrivate(privKeySpec);
        DSAParams params = ((DSAPrivateKey) priv).getParams();
        // Calculate public key Y
        BigInteger y = params.getG().modPow(((DSAPrivateKey) priv).getX(), params.getP());
        pubKeySpec = new DSAPublicKeySpec(y, params.getP(), params.getQ(), params.getG());
        pub = kf.generatePublic(pubKeySpec);
    }
    return new KeyPair(pub, priv);
}

Example 47 with DSAPublicKeySpec

use of java.security.spec.DSAPublicKeySpec in project keystore-explorer by kaikramer.

the class KeyPairUtil method getKeyInfo.

/**
 * Get the information about the supplied public key.
 *
 * @param publicKey
 *            The public key
 * @return Key information
 * @throws CryptoException
 *             If there is a problem getting the information
 */
public static KeyInfo getKeyInfo(PublicKey publicKey) throws CryptoException {
    try {
        String algorithm = publicKey.getAlgorithm();
        if (algorithm.equals(RSA.jce())) {
            KeyFactory keyFact = KeyFactory.getInstance(algorithm, BOUNCY_CASTLE.jce());
            RSAPublicKeySpec keySpec = keyFact.getKeySpec(publicKey, RSAPublicKeySpec.class);
            BigInteger modulus = keySpec.getModulus();
            return new KeyInfo(ASYMMETRIC, algorithm, modulus.toString(2).length());
        } else if (algorithm.equals(DSA.jce())) {
            KeyFactory keyFact = KeyFactory.getInstance(algorithm);
            DSAPublicKeySpec keySpec = keyFact.getKeySpec(publicKey, DSAPublicKeySpec.class);
            BigInteger prime = keySpec.getP();
            return new KeyInfo(ASYMMETRIC, algorithm, prime.toString(2).length());
        } else if (algorithm.equals(EC.jce())) {
            ECPublicKey pubk = (ECPublicKey) publicKey;
            int size = pubk.getParams().getOrder().bitLength();
            return new KeyInfo(ASYMMETRIC, algorithm, size);
        }
        // size unknown
        return new KeyInfo(ASYMMETRIC, algorithm);
    } catch (GeneralSecurityException ex) {
        throw new CryptoException(res.getString("NoPublicKeysize.exception.message"), ex);
    }
}

Example 48 with DSAPublicKeySpec

use of java.security.spec.DSAPublicKeySpec in project j2objc by google.

the class DSAPublicKeySpecTest method testGetG.

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

Example 49 with DSAPublicKeySpec

use of java.security.spec.DSAPublicKeySpec in project j2objc by google.

the class DSAPublicKeySpecTest method testGetY.

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

Example 50 with DSAPublicKeySpec

use of java.security.spec.DSAPublicKeySpec in project j2objc by google.

the class DSAPublicKeySpecTest method testGetP.

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