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(long val)

Source Link

Document

Constructs a BigInteger with the specified value, which may not be zero.

Usage

From source file:Main.java

public static String validateAndFixUserPhoneNumber(String text) {
    try {/*  w w  w . jav  a  2 s  .com*/
        text = text.trim();
        if (text.charAt(0) == '+') {
            text = text.substring(1);
        }
        BigInteger dummy = new BigInteger(text);
        if (text.charAt(0) == '8') {
            StringBuilder strBuilder = new StringBuilder(text);
            strBuilder.setCharAt(0, '7');
            text = strBuilder.toString();
        }
        if (text.charAt(0) != '7' || text.length() != 11) {
            throw new Exception();
        }
        text = "+" + text;
    } catch (Throwable t) {
        text = "";
        //LOGE("validateAndFixUserPhoneNumber: " + t.getMessage());
        t.printStackTrace();
    }

    return text;
}

From source file:Main.java

public static String BytesToBase58(byte[] value) {
    //Add 1 for each 00 byte.
    //From lowest base58 fill with division remainders.
    String returnValue = "";
    boolean justStarted = true;
    BigInteger bigValue = new BigInteger(value); //TODO: Check that it works as it should.
    BigInteger base58 = new BigInteger("58");
    BigInteger zero = new BigInteger("0");
    BigInteger[] divisionResult;/* w w  w  .j a v a  2 s. c o m*/
    while (bigValue.compareTo(zero) == 1) { //Means greater than.
        divisionResult = bigValue.divideAndRemainder(base58);
        bigValue = divisionResult[0];
        returnValue = base58Array.toCharArray()[divisionResult[1].intValue()] + returnValue;
    }
    for (int i = 0; i < value.length; i++) {
        if (value[i] == 0 && justStarted) {
            returnValue = "1" + returnValue;
        } else {
            break;
        }
        justStarted = false;
    }
    return returnValue;
}

From source file:Main.java

/**
 * Converts a little endian byte array to a BigInteger.
 *
 * @param bytes The bytes to convert./*w  w w  .j a  v  a 2 s  . com*/
 * @return The resulting BigInteger.
 */
public static BigInteger toBigInteger(final byte[] bytes) {
    final byte[] bigEndianBytes = new byte[bytes.length + 1];
    for (int i = 0; i < bytes.length; ++i) {
        bigEndianBytes[i + 1] = bytes[bytes.length - i - 1];
    }

    return new BigInteger(bigEndianBytes);
}

From source file:Main.java

public static String convertPhoneNumberTo8Format(String text) {
    try {//from w  w  w  .  j  a v  a2s.  com
        text = text.trim();
        if (text.charAt(0) == '+') {
            text = text.substring(1);
        }
        if (text.charAt(0) == '7') {
            StringBuilder strBuilder = new StringBuilder(text);
            strBuilder.setCharAt(0, '8');
            text = strBuilder.toString();
        }
        BigInteger dummy = new BigInteger(text);
        if (text.charAt(0) != '8' || text.length() != 11) {
            throw new Exception();
        }
    } catch (Throwable t) {
        text = "";
        //LOGE("convertPhoneNumberTo8Format: " + t.getMessage());
        t.printStackTrace();
    }

    return text;
}

From source file:Main.java

public static final BigInteger castToBigInteger(Object paramObject) {
    if (paramObject == null) {
        return null;
    }// w ww.  j  a v a 2s  . c om
    if ((paramObject instanceof BigInteger)) {
        return (BigInteger) paramObject;
    }
    if (((paramObject instanceof Float)) || ((paramObject instanceof Double))) {
        return BigInteger.valueOf(((Number) paramObject).longValue());
    }
    String str = paramObject.toString();
    if (str.length() == 0) {
        return null;
    }
    return new BigInteger(str);
}

From source file:Main.java

public static PrivateKey getPrivateKey(String modulus, String privateExponent)
        throws NoSuchAlgorithmException, InvalidKeySpecException {
    BigInteger bigIntModulus = new BigInteger(modulus);
    BigInteger bigIntPrivateExponent = new BigInteger(privateExponent);
    RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent);
    KeyFactory keyFactory = KeyFactory.getInstance(RSA);
    PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
    return privateKey;
}

From source file:Main.java

static Object bigIntegerElement(Element row, String name) {
    return new BigInteger(stringElement(row, name));
}

From source file:jp.co.ntts.vhut.util.MacConversionUtil.java

/**
 * ????????./* ww w  .  ja v  a2  s  .c  o  m*/
 * @param macStart ()
 * @param macEnd ()
 * @return 
 */
public static int getCount(String macStart, String macEnd) {
    BigInteger biMacStart = new BigInteger(addrToByte(macStart));
    BigInteger biMacEnd = new BigInteger(addrToByte(macEnd));
    return biMacEnd.subtract(biMacStart).intValue() + 1;
}

From source file:Main.java

static PublicKey getRsaPublicKey(String n, String e) {
    BigInteger rsaN = null;/*from  w  ww. jav a 2s.c o  m*/
    BigInteger rsaE = null;

    try {
        rsaN = new BigInteger(n);
        rsaE = new BigInteger(e);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    RSAPublicKeySpec pubRsaSpec = new RSAPublicKeySpec(rsaN, rsaE);
    try {
        KeyFactory keyfact = KeyFactory.getInstance("RSA", "SC");
        PublicKey pk = keyfact.generatePublic(pubRsaSpec);
        Log.d("getRsaPublicKey", "pubRsaKey OK " + pk.getFormat());
        return pk;
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

From source file:Main.java

/**
 * Parses the supplied xsd:integer string and returns its value.
 * //from w  w  w  .j  a v  a2s .c om
 * @param s
 *        A string representation of an xsd:integer value.
 * @return The integer value represented by the supplied string argument.
 * @throws NumberFormatException
 *         If the supplied string is not a valid xsd:integer value.
 */
public static BigInteger parseInteger(String s) {
    s = trimPlusSign(s);
    return new BigInteger(s);
}