Example usage for java.security.spec RSAKeyGenParameterSpec RSAKeyGenParameterSpec

Introduction

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

Prototype

public RSAKeyGenParameterSpec(int keysize, BigInteger publicExponent) 

Source Link

Document

Constructs a new RSAKeyGenParameterSpec object from the given keysize, public-exponent value, and null key parameters.

Usage

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    int eValue = 79;
    int bitLength = 1024; // KeySize

    BigInteger e = e = new BigInteger(Integer.toString(eValue));

    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
    kpg.initialize(bitLength);//from w ww .  j ava 2s.co m
    KeyPair kp = kpg.generateKeyPair();

    KeyFactory kfactory = KeyFactory.getInstance("RSA");
    RSAPublicKeySpec kspec = (RSAPublicKeySpec) kfactory.getKeySpec(kp.getPublic(), RSAPublicKeySpec.class);

    kpg = KeyPairGenerator.getInstance("RSA", "SunRsaSign");

    e = new BigInteger(Integer.toString(eValue));
    System.out.println("e =" + e);
    RSAKeyGenParameterSpec param = new RSAKeyGenParameterSpec(bitLength, e);
    kpg.initialize(param);
    kp = kpg.generateKeyPair();

    kfactory = KeyFactory.getInstance("RSA", "SunRsaSign");

    kspec = (RSAPublicKeySpec) kfactory.getKeySpec(kp.getPublic(), RSAPublicKeySpec.class);
}

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From source file:net.link.util.test.pkix.PkiTestUtils.java

public static KeyPair generateKeyPair(String algorithm)
        throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {

    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(algorithm);
    SecureRandom random = new SecureRandom();
    if ("RSA".equals(keyPairGenerator.getAlgorithm()))
        keyPairGenerator.initialize(new RSAKeyGenParameterSpec(RSA_KEYSIZE, RSAKeyGenParameterSpec.F4), random);
    else if (keyPairGenerator instanceof DSAKeyPairGenerator) {
        DSAKeyPairGenerator dsaKeyPairGenerator = (DSAKeyPairGenerator) keyPairGenerator;
        dsaKeyPairGenerator.initialize(DSA_MODLEN, false, random);
    }/*w  ww.  j a  va2 s. c  o m*/
    return keyPairGenerator.generateKeyPair();
}

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From source file:im.whistle.crypt.Crypt.java

/**
 * Generates a private/public key pair./* ww w .  j  a va  2  s .  c om*/
 * @param args Arguments, element at 0 is the key size
 * @param callback Callback
 */
public static void genkeys(JSONArray args, AsyncCallback<JSONArray> callback) {
    try {
        Log.i("whistle", "Generating key pair ...");
        PRNGProvider.init(); // Ensure OpenSSL fix
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        int bits = args.getInt(0);
        int exp = args.getInt(1);
        keyPairGenerator.initialize(new RSAKeyGenParameterSpec(bits, BigInteger.valueOf(exp)));
        KeyPair keyPair = keyPairGenerator.genKeyPair();
        String priv = "-----BEGIN RSA PRIVATE KEY-----\n"
                + Base64.encodeToString(keyPair.getPrivate().getEncoded(), Base64.DEFAULT).trim()
                + "\n-----END RSA PRIVATE KEY-----";
        String pub = "-----BEGIN PUBLIC KEY-----\n"
                + Base64.encodeToString(keyPair.getPublic().getEncoded(), Base64.DEFAULT).trim()
                + "\n-----END PUBLIC KEY-----";
        JSONArray res = new JSONArray();
        res.put(priv);
        res.put(pub);
        callback.success(res);
    } catch (Exception ex) {
        Log.w("whistle", "Key pair generation failed: " + ex.getMessage());
        callback.error(ex);
    }
}

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From source file:ru.jts_dev.authserver.config.KeyGenerationConfig.java

@Bean
public KeyPairGenerator RSAKeyPairGenerator()
        throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
    KeyPairGenerator keygen;//  ww  w  . ja  v a2 s  . co m

    keygen = KeyPairGenerator.getInstance("RSA");
    RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(1024, RSAKeyGenParameterSpec.F4);
    keygen.initialize(spec);

    return keygen;
}

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From source file:test.be.fedict.eid.applet.RSATest.java

@Test
public void testManualEncryption() throws Exception {
    while (true) {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA",
                BouncyCastleProvider.PROVIDER_NAME);
        SecureRandom random = new SecureRandom();
        int keySize = 128;
        keyPairGenerator.initialize(new RSAKeyGenParameterSpec(keySize, RSAKeyGenParameterSpec.F0), random);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        PrivateKey privateKey = keyPair.getPrivate();
        PublicKey publicKey = keyPair.getPublic();
        RSAPrivateCrtKey rsaPrivateKey = (RSAPrivateCrtKey) privateKey;
        LOG.debug("private key modulus: " + rsaPrivateKey.getModulus());
        RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey;
        LOG.debug("public key modulus: " + rsaPublicKey.getModulus());
        LOG.debug("public key exponent: " + rsaPublicKey.getPublicExponent());
        LOG.debug("modulus size: " + rsaPublicKey.getModulus().toByteArray().length);

        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);

        int dataSize = keySize / 8 - 11;
        byte[] data1 = new byte[dataSize];
        for (int i = 0; i < data1.length; i++) {
            data1[i] = 0x00;//from  w  w  w  . j av a  2s  . c o m
        }
        byte[] data2 = new byte[dataSize];
        for (int i = 0; i < data2.length; i++) {
            data2[i] = 0x00;
        }
        data2[data2.length - 1] = 0x07;

        byte[] signatureValue1 = cipher.doFinal(data1);

        LOG.debug("signature size: " + signatureValue1.length);

        cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] signatureValue2 = cipher.doFinal(data2);

        BigInteger sigBigInt1 = new BigInteger(signatureValue1);
        BigInteger sigBigInt2 = new BigInteger(signatureValue2);
        BigInteger msgBigInt1 = sigBigInt1.modPow(rsaPublicKey.getPublicExponent(), rsaPublicKey.getModulus());
        BigInteger msgBigInt2 = sigBigInt2.modPow(rsaPublicKey.getPublicExponent(), rsaPublicKey.getModulus());
        LOG.debug("msg big int: " + msgBigInt1);
        byte[] msgBytes1 = msgBigInt1.toByteArray();
        LOG.debug("original message size: " + msgBytes1.length);
        LOG.debug("original message1: " + new String(Hex.encodeHex(msgBytes1)));
        LOG.debug("original message2: " + new String(Hex.encodeHex(msgBigInt2.toByteArray())));

        LOG.debug("msg1 prime: " + msgBigInt1.isProbablePrime(100));
        LOG.debug("msg2 prime: " + msgBigInt2.isProbablePrime(100));

        // BigInteger.pow offers a very naive implementation
        LOG.debug("calculating s1^e...");
        BigInteger s1_e = sigBigInt1.pow(rsaPublicKey.getPublicExponent().intValue());
        LOG.debug("s1^e: " + s1_e);
        LOG.debug("calculating s2^e...");
        BigInteger s2_e = sigBigInt2.pow(rsaPublicKey.getPublicExponent().intValue());
        LOG.debug("s2^e: " + s2_e);

        LOG.debug("calculating GCD...");
        LOG.debug("msg1: " + msgBigInt1);
        LOG.debug("msg2: " + msgBigInt2);
        BigInteger a = s1_e.subtract(msgBigInt1);
        BigInteger b = s2_e.subtract(msgBigInt2);
        LOG.debug("a: " + a);
        LOG.debug("b: " + b);
        BigInteger candidateModulus = a.gcd(b);
        LOG.debug("candidate modulus: " + candidateModulus);
        LOG.debug("candidate modulus size: " + candidateModulus.toByteArray().length);
        BigInteger s_e = s1_e.multiply(s2_e);
        BigInteger m = msgBigInt1.multiply(msgBigInt2);
        while (false == rsaPublicKey.getModulus().equals(candidateModulus)) {
            LOG.error("incorrect candidate modulus");
            LOG.debug("modulus | candidate modulus: "
                    + candidateModulus.remainder(rsaPublicKey.getModulus()).equals(BigInteger.ZERO));
            s_e = s_e.multiply(s1_e);
            m = m.multiply(msgBigInt1);
            BigInteger n1 = s_e.subtract(m).gcd(a);
            BigInteger n2 = s_e.subtract(m).gcd(b);
            candidateModulus = n1.gcd(n2);
            // try / 2
            LOG.debug("new modulus:       " + n1);
            LOG.debug("new modulus:       " + n2);
            LOG.debug("candidate modulus: " + candidateModulus);
            LOG.debug("actual mod:        " + rsaPublicKey.getModulus());
        }
    }
}

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From source file:org.demosoft.medieval.life.loginserver.LoginController.java

private LoginController() throws GeneralSecurityException {
    _log.info("Loading LoginContoller...");

    _keyPairs = new ScrambledKeyPair[10];

    KeyPairGenerator keygen = null;

    keygen = KeyPairGenerator.getInstance("RSA");
    RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(1024, RSAKeyGenParameterSpec.F4);
    keygen.initialize(spec);//from w w w  .j  a v a  2  s .  c  om

    // generate the initial set of keys
    for (int i = 0; i < 10; i++) {
        _keyPairs[i] = new ScrambledKeyPair(keygen.generateKeyPair());
    }
    _log.info("Cached 10 KeyPairs for RSA communication");

    testCipher((RSAPrivateKey) _keyPairs[0]._pair.getPrivate());

    // Store keys for blowfish communication
    generateBlowFishKeys();
}

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From source file:be.e_contract.mycarenet.common.SessionKey.java

/**
 * Generator constructor. Creates a new MyCareNet session key.
 * /*from www  .  j a  v  a  2  s. com*/
 * @param keySize
 *            the RSA key size.
 */
public SessionKey(int keySize) {
    KeyPairGenerator keyPairGenerator;
    try {
        keyPairGenerator = KeyPairGenerator.getInstance("RSA");
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException("RSA algo not available", e);
    }
    SecureRandom random = new SecureRandom();
    try {
        keyPairGenerator.initialize(new RSAKeyGenParameterSpec(keySize, RSAKeyGenParameterSpec.F4), random);
    } catch (InvalidAlgorithmParameterException e) {
        throw new RuntimeException("unsupported key size: " + keySize);
    }
    this.keyPair = keyPairGenerator.generateKeyPair();
}

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From source file:com.l2jfree.loginserver.manager.GameServerManager.java

/**
 * Load RSA keys//from  www  .  j av  a  2  s.c  om
 * @throws NoSuchAlgorithmException
 * @throws InvalidAlgorithmParameterException
 */
private void loadRSAKeys() throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
    RSAKeyGenParameterSpec spec = new RSAKeyGenParameterSpec(512, RSAKeyGenParameterSpec.F4);
    keyGen.initialize(spec);

    _keyPairs = new KeyPair[KEYS_SIZE];
    for (int i = 0; i < KEYS_SIZE; i++) {
        _keyPairs[i] = keyGen.genKeyPair();
    }
    _log.info("GameServerManager: Cached " + _keyPairs.length + " RSA keys for Game Server communication.");
}

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From source file:test.integ.be.fedict.trust.util.TestUtils.java

public static KeyPair generateKeyPair(String algorithm)
        throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {

    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(algorithm);
    SecureRandom random = new SecureRandom();
    if ("RSA".equals(keyPairGenerator.getAlgorithm())) {
        keyPairGenerator.initialize(new RSAKeyGenParameterSpec(1024, RSAKeyGenParameterSpec.F4), random);
    } else if (keyPairGenerator instanceof DSAKeyPairGenerator) {
        DSAKeyPairGenerator dsaKeyPairGenerator = (DSAKeyPairGenerator) keyPairGenerator;
        dsaKeyPairGenerator.initialize(512, false, random);
    }/*from   w w  w . j a va  2  s.c om*/
    return keyPairGenerator.generateKeyPair();
}

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From source file:org.cogroo.addon.util.SecurityUtil.java

public KeyPair genKeyPair() {
    KeyPair kpr = null;//  ww w  .ja va2  s  .  co m
    try {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
        kpg.initialize(new RSAKeyGenParameterSpec(RSAKEYSIZE, RSAKeyGenParameterSpec.F4));
        kpr = kpg.generateKeyPair();
    } catch (NoSuchAlgorithmException e) {
        LOG.log(Level.SEVERE, "Error generating key pair", e);
    } catch (InvalidAlgorithmParameterException e) {
        LOG.log(Level.SEVERE, "Error generating key pair", e);
    }
    return kpr;
}

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