Example usage for java.math BigInteger BigInteger

Introduction

In this page you can find the example usage for java.math BigInteger BigInteger.

Prototype

private BigInteger(byte[] magnitude, int signum) 

Source Link

Document

This private constructor is for internal use and assumes that its arguments are correct.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    Random randomGenerator = SecureRandom.getInstance("SHA1PRNG");
    BigInteger randomInteger = new BigInteger(1024, randomGenerator);
    System.out.println(randomInteger);
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    int bitLength = 512; // 512 bits
    Random rnd = new Random();
    System.out.println("BitLength : " + bitLength);
    BigInteger mod = new BigInteger(bitLength, rnd);

}

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From source file:ClientServicesQA.java

public static void main(String[] args) throws Exception {
    // TODO Auto-generated method stub
    String id = "LNWS-AM38-12M9";
    id = id.replace("-", "");
    System.out.println(id);/* ww w. j a v a 2 s. co m*/

    byte[] bytes = {};
    BigInteger big = new BigInteger(id, 36);
    System.out.println(big);

    /*      ClientServicesQA cs = new ClientServicesQA();
          WebDriver driver;
                  
          Calendar cal = Calendar.getInstance();
          int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);
          int month = cal.get(Calendar.MONTH);
          int year = cal.get(Calendar.YEAR);
                  
                  
                  
          driver = new FirefoxDriver();
          String baseURL  = "https://login-aws-qa.tegrity.com/Service/login.aspx";
    //      cs.loginToClientServices(baseURL, driver);
    //      cs.createNewTegrityCustomer(driver);
          cs.createNewInstitution(driver, dayOfMonth, month, year);
                  
    //      System.out.println("The current day of the month is: " + dayOfMonth);
    //      System.out.println("The current month is: " + month);
    */

}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDH", "BC");
    EllipticCurve curve = new EllipticCurve(
            new ECFieldFp(new BigInteger("fffffffffffffffffffffffffffffffeffffffffffffffff", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16));

    ECParameterSpec ecSpec = new ECParameterSpec(curve,
            new ECPoint(new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
                    new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16), 1);

    keyGen.initialize(ecSpec, new SecureRandom());

    KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair aPair = keyGen.generateKeyPair();
    KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair bPair = keyGen.generateKeyPair();

    aKeyAgree.init(aPair.getPrivate());/*from ww  w .j  a  v a2 s  .c o  m*/
    bKeyAgree.init(bPair.getPrivate());

    aKeyAgree.doPhase(bPair.getPublic(), true);
    bKeyAgree.doPhase(aPair.getPublic(), true);

    MessageDigest hash = MessageDigest.getInstance("SHA1", "BC");

    System.out.println(new String(hash.digest(aKeyAgree.generateSecret())));
    System.out.println(new String(hash.digest(bKeyAgree.generateSecret())));
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    byte[] input = new byte[] { (byte) 0xbe, (byte) 0xef };
    Cipher cipher = Cipher.getInstance("RSA/None/NoPadding", "BC");

    KeyFactory keyFactory = KeyFactory.getInstance("RSA", "BC");
    RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger("12345678", 16),
            new BigInteger("11", 16));
    RSAPrivateKeySpec privKeySpec = new RSAPrivateKeySpec(new BigInteger("12345678", 16),
            new BigInteger("12345678", 16));

    RSAPublicKey pubKey = (RSAPublicKey) keyFactory.generatePublic(pubKeySpec);
    RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(privKeySpec);

    cipher.init(Cipher.ENCRYPT_MODE, pubKey);

    byte[] cipherText = cipher.doFinal(input);
    System.out.println("cipher: " + new String(cipherText));

    cipher.init(Cipher.DECRYPT_MODE, privKey);
    byte[] plainText = cipher.doFinal(cipherText);
    System.out.println("plain : " + new String(plainText));
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    // Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDH", "BC");
    EllipticCurve curve = new EllipticCurve(
            new ECFieldFp(new BigInteger("fffffffffffffffffffffffffffffffeffffffffffffffff", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16));

    ECParameterSpec ecSpec = new ECParameterSpec(curve,
            new ECPoint(new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
                    new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16), 1);

    keyGen.initialize(ecSpec, new SecureRandom());

    KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair aPair = keyGen.generateKeyPair();
    KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair bPair = keyGen.generateKeyPair();

    aKeyAgree.init(aPair.getPrivate());//  www .  j  av  a2  s.com
    bKeyAgree.init(bPair.getPrivate());

    aKeyAgree.doPhase(bPair.getPublic(), true);
    bKeyAgree.doPhase(aPair.getPublic(), true);

    MessageDigest hash = MessageDigest.getInstance("SHA1", "BC");

    System.out.println(new String(hash.digest(aKeyAgree.generateSecret())));
    System.out.println(new String(hash.digest(bKeyAgree.generateSecret())));
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String s = "F488FD584E49DBCD20B49DE49107366B336C380D451D0F7C88"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111" + "2F78C7";
    BigInteger base = BigInteger.valueOf(2);
    BigInteger modulus = new BigInteger(s, 16);
    DHParameterSpec skipParameterSpec = new DHParameterSpec(modulus, base);

    KeyPairGenerator kpg1 = KeyPairGenerator.getInstance("DH");
    kpg1.initialize(skipParameterSpec);/*from  ww  w.  j  a v  a  2s . co m*/
    KeyPair kp1 = kpg1.generateKeyPair();

    KeyAgreement ka1 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey1 = (DHPrivateKey) kp1.getPrivate();
    DHPublicKey publicKey1 = (DHPublicKey) kp1.getPublic();
    ka1.init(privateKey1);
    System.out.println("1 is using " + publicKey1.getY() + " for its public key");
    KeyPairGenerator kpg2 = KeyPairGenerator.getInstance("DH");
    kpg2.initialize(skipParameterSpec);
    KeyPair kp2 = kpg2.generateKeyPair();

    KeyAgreement ka2 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey2 = (DHPrivateKey) kp2.getPrivate();
    DHPublicKey publicKey2 = (DHPublicKey) kp2.getPublic();
    ka2.init(privateKey2);
    System.out.println("2 is using " + publicKey2.getY() + " for its public key");
    ka1.doPhase(publicKey2, true);
    byte[] sharedKey1 = ka1.generateSecret();
    System.out.println("1 is using " + new BigInteger(1, sharedKey1) + " for its shared key");

    ka2.doPhase(publicKey1, true);
    byte[] sharedKey2 = ka2.generateSecret();
    System.out.println("2 is using " + new BigInteger(1, sharedKey2) + " for its shared key");
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String s = "F488FD584E49DBCD20B49DE49107366B336C380D451D0F7C88"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111" + "2F78C7";
    BigInteger base = BigInteger.valueOf(2);
    BigInteger modulous = new BigInteger(s, 16);
    DHParameterSpec skipParameterSpec = new DHParameterSpec(modulous, base);

    KeyPairGenerator kpg1 = KeyPairGenerator.getInstance("DH");
    kpg1.initialize(skipParameterSpec);//from   w ww. j  a va2  s  .c  om
    KeyPair kp1 = kpg1.generateKeyPair();

    KeyAgreement ka1 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey1 = (DHPrivateKey) kp1.getPrivate();
    DHPublicKey publicKey1 = (DHPublicKey) kp1.getPublic();
    ka1.init(privateKey1);
    System.out.println("1 is using " + publicKey1.getY() + " for its public key");

    KeyPairGenerator kpg2 = KeyPairGenerator.getInstance("DH");
    kpg2.initialize(skipParameterSpec);
    KeyPair kp2 = kpg2.generateKeyPair();

    KeyAgreement ka2 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey2 = (DHPrivateKey) kp2.getPrivate();
    DHPublicKey publicKey2 = (DHPublicKey) kp2.getPublic();
    ka2.init(privateKey2);
    System.out.println("2 is using " + publicKey2.getY() + "for its public key");
    // Use the KeyAgreement object of 1 to generate its shared key
    ka1.doPhase(publicKey2, true);
    SecretKey sharedKey1 = ka1.generateSecret("DES");
    System.out.println("1 is using " + new String(sharedKey1.getEncoded()) + " as its DES session key");
    // Use the KeyAgreement object of 2 to generate its shared key
    ka2.doPhase(publicKey1, true);
    SecretKey sharedKey2 = ka2.generateSecret("DES");
    System.out.println("2 is using " + new String(sharedKey2.getEncoded()) + "as its DES session key");
}

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From source file:HashCollider.java

/**i
 * @param args the command line arguments
 *//*from w ww.j a v  a2 s  .co  m*/
public static void main(String[] args) {
    Random random = new Random();
    byte[] nbytes1 = new byte[64];
    byte[] nbytes2 = new byte[64];
    float average = 0;
    // set number of bits for checking collision
    int number_of_bits = 4;
    random.nextBytes(nbytes1);
    random.nextBytes(nbytes2);

    String sha1 = DigestUtils.sha256Hex(nbytes1);
    String sha2 = DigestUtils.sha256Hex(nbytes2);

    String nsh1 = new BigInteger(sha1, 16).toString(2);
    String nsh2 = new BigInteger(sha2, 16).toString(2);
    int i = 0;
    for (int j = 0; j < 5; j++) {
        while (true) {
            if (nsh1.substring(0, number_of_bits - 1).equals(nsh2.substring(0, number_of_bits - 1))) {
                System.out.println(i);
                average += i;
                break;
            }
            i++;
            //            System.out.println("......"+i);
            random.nextBytes(nbytes1);
            random.nextBytes(nbytes2);
            sha1 = DigestUtils.sha256Hex(nbytes1);
            sha2 = DigestUtils.sha256Hex(nbytes2);
            nsh1 = new BigInteger(sha1, 16).toString(2);
            nsh2 = new BigInteger(sha2, 16).toString(2);
        }
        i = 0;
        //        System.out.println(nsh1+"\n"+nsh2);
        random.nextBytes(nbytes1);
        random.nextBytes(nbytes2);
        sha1 = DigestUtils.sha256Hex(nbytes1);
        sha2 = DigestUtils.sha256Hex(nbytes2);
        nsh1 = new BigInteger(sha1, 16).toString(2);
        nsh2 = new BigInteger(sha2, 16).toString(2);

    }
    //
    System.out.println("Average for  " + number_of_bits + " bits is  " + average / 5);

}

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From source file:dhtaccess.tools.Get.java

public static void main(String[] args) {
    boolean details = false;

    // parse properties
    Properties prop = System.getProperties();
    String gateway = prop.getProperty("dhtaccess.gateway");
    if (gateway == null || gateway.length() <= 0) {
        gateway = DEFAULT_GATEWAY;/*  w w  w  . j  a v a2s  . c  o m*/
    }

    // parse options
    Options options = new Options();
    options.addOption("h", "help", false, "print help");
    options.addOption("g", "gateway", true, "gateway URI, list at http://opendht.org/servers.txt");
    options.addOption("d", "details", false, "print secret hash and TTL");

    CommandLineParser parser = new PosixParser();
    CommandLine cmd = null;
    try {
        cmd = parser.parse(options, args);
    } catch (ParseException e) {
        System.out.println("There is an invalid option.");
        e.printStackTrace();
        System.exit(1);
    }

    String optVal;
    if (cmd.hasOption('h')) {
        usage(COMMAND);
        System.exit(1);
    }
    optVal = cmd.getOptionValue('g');
    if (optVal != null) {
        gateway = optVal;
    }
    if (cmd.hasOption('d')) {
        details = true;
    }

    args = cmd.getArgs();

    // parse arguments
    if (args.length < 1) {
        usage(COMMAND);
        System.exit(1);
    }

    // prepare for RPC
    DHTAccessor accessor = null;
    try {
        accessor = new DHTAccessor(gateway);
    } catch (MalformedURLException e) {
        e.printStackTrace();
        System.exit(1);
    }

    for (int index = 0; index < args.length; index++) {
        byte[] key = null;
        try {
            key = args[index].getBytes(ENCODE);
        } catch (UnsupportedEncodingException e1) {
            // NOTREACHED
        }

        // RPC
        if (args.length > 1) {
            System.out.println(args[index] + ":");
        }

        if (details) {
            Set<DetailedGetResult> results = accessor.getDetails(key);

            for (DetailedGetResult r : results) {
                String valString = null;
                try {
                    valString = new String((byte[]) r.getValue(), ENCODE);
                } catch (UnsupportedEncodingException e) {
                    // NOTREACHED
                }

                BigInteger hashedSecure = new BigInteger(1, (byte[]) r.getHashedSecret());

                System.out.println(valString + " " + r.getTTL() + " " + r.getHashType() + " 0x"
                        + ("0000000" + hashedSecure.toString(16)).substring(0, 8));
            }
        } else {
            Set<byte[]> results = accessor.get(key);

            for (byte[] valBytes : results) {
                try {
                    System.out.println(new String((byte[]) valBytes, ENCODE));
                } catch (UnsupportedEncodingException e) {
                    // NOTREACHED
                }
            }
        }
    } // for (int index = 0...
}

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