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:com.livily.pusher.Pusher.java

/**
 * Returns a HMAC/SHA256 representation of the given string
 * // w  ww. j  a  va2  s .  co  m
 * @param data
 * @return
 */
private static String hmacsha256Representation(String data) {
    try {
        // Create the HMAC/SHA256 key from application secret
        final SecretKeySpec signingKey = new SecretKeySpec(pusherApplicationSecret.getBytes(), "HmacSHA256");

        // Create the message authentication code (MAC)
        final Mac mac = Mac.getInstance("HmacSHA256");
        mac.init(signingKey);

        // Process and return data
        byte[] digest = mac.doFinal(data.getBytes("UTF-8"));
        digest = mac.doFinal(data.getBytes());
        // Convert to string
        BigInteger bigInteger = new BigInteger(1, digest);
        return String.format("%0" + (digest.length << 1) + "x", bigInteger);
    } catch (NoSuchAlgorithmException nsae) {
        // We should never come here, because GAE has HMac SHA256
        throw new RuntimeException("No HMac SHA256 algorithm");
    } catch (UnsupportedEncodingException e) {
        // We should never come here, because UTF-8 should be available
        throw new RuntimeException("No UTF-8");
    } catch (InvalidKeyException e) {
        throw new RuntimeException("Invalid key exception while converting to HMac SHA256");
    }
}

From source file:components.security.Password.java

/**
 * Generates a token.
 *
 * @return the generated token.
 */
public String generateToken() {
    return new BigInteger(1024, random).toString(32);
}

From source file:com.offbynull.peernetic.common.identification.IdGenerator.java

/**
 * Generates a {@link Id}./*  ww  w.  j a v  a 2s  . co  m*/
 * @return a {@link Id} between {@code 0} and {@code limit}
 * @throws NullPointerException if any arguments are {@code null}
 */
public Id generate() {
    try {
        int rawLen = limit.length;
        byte[] raw = new byte[rawLen];
        random.nextBytes(raw);

        BigInteger rawBd = new BigInteger(1, raw);
        BigInteger limitBd = new BigInteger(1, limit);

        rawBd = rawBd.mod(limitBd);

        return new Id(rawBd.toByteArray(), limit);
    } catch (Exception e) {
        throw new IllegalStateException(e);
    }
}

From source file:com.cloud.server.auth.MD5UserAuthenticator.java

@Override
public String encode(final String password) {
    try {/*from   www .  j  a va2 s  .  c om*/
        final MessageDigest md5 = MessageDigest.getInstance("MD5");
        md5.reset();
        BigInteger pwInt = new BigInteger(1, md5.digest(password.getBytes()));
        String pwStr = pwInt.toString(16);
        int padding = 32 - pwStr.length();
        StringBuilder sb = new StringBuilder(32);
        for (int i = 0; i < padding; i++) {
            sb.append('0'); // make sure the MD5 password is 32 digits long
        }
        sb.append(pwStr);
        return sb.toString();
    } catch (NoSuchAlgorithmException e) {
        throw new CloudRuntimeException("Unable to hash password", e);
    }

}

From source file:com.github.sebhoss.identifier.service.SuppliedIdentifiers.java

@Override
public String nextUuidInBase62() {
    return Base62.encode(new BigInteger(convertUuidToString(randomUUID()), 16));
}

From source file:net.bioclipse.dbxp.business.DbxpManager.java

public static String getMD5Sum(String variable) throws NoSuchAlgorithmException {
    MessageDigest md = MessageDigest.getInstance("MD5");
    md.update(variable.getBytes());// ww w  .  j ava2 s  .  c  o  m
    return new BigInteger(1, md.digest()).toString(16);
}

From source file:com.artivisi.iso8583.Message.java

public void setPrimaryBitmapStream(String bitmap) {
    this.primaryBitmap = new BigInteger(bitmap, 16);
}

From source file:org.springframework.cloud.consul.bus.EventService.java

/**
 * from https://github.com/hashicorp/consul/blob/master/api/event.go#L90-L104 //
 * IDToIndex is a bit of a hack. This simulates the index generation to // convert an
 * event ID into a WaitIndex. func (e *Event) IDToIndex(uuid string) uint64 { lower :=
 * uuid[0:8] + uuid[9:13] + uuid[14:18] upper := uuid[19:23] + uuid[24:36] lowVal, err
 * := strconv.ParseUint(lower, 16, 64) if err != nil { panic("Failed to convert " +
 * lower) } highVal, err := strconv.ParseUint(upper, 16, 64) if err != nil {
 * panic("Failed to convert " + upper) } return lowVal ^ highVal //^ bitwise XOR
 * integers }//from   w w  w.java  2  s .  co  m
 */
public BigInteger toIndex(String eventId) {
    String lower = eventId.substring(0, 8) + eventId.substring(9, 13) + eventId.substring(14, 18);
    String upper = eventId.substring(19, 23) + eventId.substring(24, 36);
    BigInteger lowVal = new BigInteger(lower, 16);
    BigInteger highVal = new BigInteger(upper, 16);
    BigInteger index = lowVal.xor(highVal);
    return index;
}

From source file:edu.utdallas.bigsecret.cipher.AesCtr.java

/**
 * Encrypts input data with AES CTR mode.
 * @param data Input byte array.// ww w.j  av  a  2  s .  c om
 * @return Encryption result.
 * @throws Exception Throws exception if there is no data to encrypt.<br>
 *                 May throw exception based on Javax.Crypto.Cipher class
 */
public byte[] encrypt(byte[] data) throws Exception {
    //check if there is data to encrypt
    if (data.length == 0) {
        throw new Exception("No data to encrypt");
    }

    //create iv
    byte[] iv = new byte[BLOCK_SIZE_BYTES];
    byte[] randomNumber = (new BigInteger(BLOCK_SIZE_BITS, m_secureRandom)).toByteArray();
    int a;
    for (a = 0; a < randomNumber.length && a < BLOCK_SIZE_BYTES; a++)
        iv[a] = randomNumber[a];
    for (; a < BLOCK_SIZE_BYTES; a++)
        iv[a] = 0;

    //init cipher instance
    m_cipher.init(javax.crypto.Cipher.ENCRYPT_MODE, m_keySpec, new IvParameterSpec(iv));

    //return concatenation of iv + encrypted data      
    return ArrayUtils.addAll(iv, m_cipher.doFinal(data));
}

From source file:org.smartplatforms.oauth2.SmartClientUserDetailsService.java

@Override
public UserDetails loadUserByUsername(String clientId) throws UsernameNotFoundException {

    try {/* w w  w.  ja  va 2 s. c o  m*/
        ClientDetailsEntity client = clientDetailsService.loadClientByClientId(clientId);

        if (client != null) {

            String password = Strings.nullToEmpty(client.getClientSecret());

            if (client.getTokenEndpointAuthMethod() != null
                    && (client.getTokenEndpointAuthMethod().equals(AuthMethod.PRIVATE_KEY)
                            || client.getTokenEndpointAuthMethod().equals(AuthMethod.SECRET_JWT))) {

                // Issue a random password each time to prevent password auth from being used (or skipped)
                // for private key or shared key clients, see #715

                password = new BigInteger(512, new SecureRandom()).toString(16);
            }

            boolean enabled = true;
            boolean accountNonExpired = true;
            boolean credentialsNonExpired = true;
            boolean accountNonLocked = true;
            Collection<GrantedAuthority> authorities = new HashSet<GrantedAuthority>(client.getAuthorities());
            authorities.add(ROLE_CLIENT);

            if (adminClients.contains(client.getClientId())) {
                GrantedAuthority roleClient = new SimpleGrantedAuthority("ROLE_ADMIN");
                authorities.add(roleClient);
            }

            return new User(clientId, password, enabled, accountNonExpired, credentialsNonExpired,
                    accountNonLocked, authorities);
        } else {
            throw new UsernameNotFoundException("Client not found: " + clientId);
        }
    } catch (InvalidClientException e) {
        throw new UsernameNotFoundException("Client not found: " + clientId);
    }

}