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

private static String digest(final String value) {
    byte[] digested;
    try {//from w w  w  . java 2 s.c om
        digested = MessageDigest.getInstance(HASH_ALGORITHM).digest(value.getBytes(CHARSET));
    } catch (NoSuchAlgorithmException e) {
        return null;
    } catch (UnsupportedEncodingException e) {
        return null;
    }

    String hashed = new BigInteger(1, digested).toString(16);
    int padding = HASH_LENGTH - hashed.length();
    if (padding == 0)
        return hashed;

    char[] zeros = new char[padding];
    Arrays.fill(zeros, '0');
    return new StringBuilder(HASH_LENGTH).append(zeros).append(hashed).toString();
}

From source file:br.com.gerenciapessoal.service.CadastroUsuarioService.java

@SuppressWarnings("null")
public static String md5(String input) {
    String md5 = null;// w  w w  . j a  va 2s.  co  m
    if (!StringUtils.isNotBlank(input)) {
        return null;
    }
    try {
        //Create MessageDigest object for MD5           
        MessageDigest digest = MessageDigest.getInstance("MD5");
        //Update input string in message digest           
        digest.update(input.getBytes(), 0, input.length());
        //Converts message digest value in base 16 (hex)            
        md5 = new BigInteger(1, digest.digest()).toString(16);
    } catch (NoSuchAlgorithmException e) {
    }
    return md5.trim();
}

From source file:com.algodefu.yeti.md5.MD5HashGenerator.java

public static String generateKeyByObject(Object object) {
    MessageDigest m = null;//from   www  .  j  a  v  a  2  s .  c o  m
    try {
        m = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    m.reset();
    //m.update(objectToByteArray(object));
    m.update(SerializationUtils.serialize((Serializable) object));
    byte[] digest = m.digest();
    BigInteger bigInt = new BigInteger(1, digest);
    String hashtext = bigInt.toString(16);
    while (hashtext.length() < 32) {
        hashtext = "0" + hashtext;
    }
    return hashtext;
}

From source file:Main.java

public static String getMD5EncryptedString(String encTarget) {
    MessageDigest mdEnc = null;/*from w ww . jav a2  s. c  om*/
    try {
        mdEnc = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        System.out.println("Exception while encrypting to md5");
        e.printStackTrace();
    } // Encryption algorithm
    mdEnc.update(encTarget.getBytes(), 0, encTarget.length());
    String md5 = new BigInteger(1, mdEnc.digest()).toString(16);
    while (md5.length() < 32) {
        md5 = "0" + md5;
    }
    return md5;
}

From source file:net.ftb.util.CryptoUtils.java

/**
 * Newer implementation available if possible use {@link #decrypt(String str, byte[] key)}
 * @param str string to decrypt/*  w  w  w  .j ava2s.  co  m*/
 * @param key decryption key
 * @return decrypted string or "" if fails
 */
@Deprecated
public static String decryptLegacy(String str, byte[] key) {
    BigInteger in = new BigInteger(str, 16).xor(new BigInteger(1, key));
    try {
        return new String(in.toByteArray(), "utf8");
    } catch (UnsupportedEncodingException e) {
        return "";
    } catch (NumberFormatException e) {
        Logger.logError("Error occurred during legacy decryption");
        return "";
    }
}

From source file:Main.java

public static RSAPublicKeySpec getRecipientsPublicKey(String contactNum, Context context) {
    Log.w(TAG, "retrieving public key for contact " + contactNum);
    SharedPreferences prefs = context.getSharedPreferences(contactNum, Context.MODE_PRIVATE);

    String pubMod = prefs.getString(PREF_PUBLIC_MOD, DEFAULT_PREF);
    String pubExp = prefs.getString(PREF_PUBLIC_EXP, DEFAULT_PREF);
    Log.w(TAG, "the public modulus is " + pubMod + " and exponent is " + pubExp + " for " + contactNum);
    // String recipient = prefs.getString(PREF_RECIPIENT_NUM, DEFAULT_PREF);
    if (!pubMod.isEmpty() && !pubExp.isEmpty()) {
        Log.i(TAG, "great! public key found for " + contactNum + " with modulus " + pubMod + " and exponent "
                + pubExp);/*from  w  ww  .  jav  a2  s .  c  o  m*/
        byte[] pubModBA = Base64.decode(pubMod, Base64.DEFAULT);
        byte[] pubExpBA = Base64.decode(pubExp, Base64.DEFAULT);
        BigInteger pubModBI = new BigInteger(1, pubModBA); // 1 is added as
        // an attempt to
        // deal with
        // com.android.org.bouncycastle.crypto.DataLengthException:
        // input too
        // large for RSA
        // cipher
        BigInteger pubExpBI = new BigInteger(1, pubExpBA);
        Log.i(TAG, "public modulus is " + pubModBI + " and public exponent is " + pubExpBI + " in base 256 "
                + pubModBA + " " + pubExpBA);

        // do I need to catch any exception for the following?
        RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(pubModBI, pubExpBI);
        // X509EncodedKeySpec publicKeySpec = new
        // X509EncodedKeySpec(encodedKey);

        return pubKeySpec;
    }
    Log.w(TAG, "recipient's public key not found");
    return null;

}

From source file:Main.java

public static String toHex(byte[] bytes) {
    BigInteger bi = new BigInteger(1, bytes);
    return String.format("%0" + (bytes.length << 1) + "X", bi);
}

From source file:Main.java

public static String getMD5(String str) {
    if (str != null) {
        try {//from   w ww .  j a v a2 s .c  o m
            final BigInteger bigInt;
            if (sMD5Digest == null) {
                sMD5Digest = MessageDigest.getInstance("MD5");
            }
            synchronized (sMD5Digest) {
                sMD5Digest.reset();
                bigInt = new BigInteger(1, sMD5Digest.digest(str.getBytes("UTF-8")));
            }
            String hash = bigInt.toString(16);
            while (hash.length() < 32) {
                hash = "0" + hash;
            }
            return hash;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    return null;
}

From source file:com.codemage.sql.util.API_keyGenarator.java

public String nextAPIId() {
    return new BigInteger(130, random).toString(32);
}

From source file:MD5.java

public static String calculateMD5(File updateFile) {
    MessageDigest digest;/*from ww  w  . j  a  va2 s  .  c o m*/
    try {
        digest = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        return null;
    }
    InputStream is;
    try {
        is = new FileInputStream(updateFile);
    } catch (FileNotFoundException e) {
        return null;
    }
    byte[] buffer = new byte[8192];
    int read;
    try {
        while ((read = is.read(buffer)) > 0) {
            digest.update(buffer, 0, read);
        }
        byte[] md5sum = digest.digest();
        BigInteger bigInt = new BigInteger(1, md5sum);
        String output = bigInt.toString(16);
        // Fill to 32 chars
        output = String.format("%32s", output).replace(' ', '0');
        return output;
    } catch (IOException e) {
        throw new RuntimeException("Unable to process file for MD5", e);
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            System.out.println(e);
        }
    }
}