Java Utililty Methods BigInteger Calculate

List of utility methods to do BigInteger Calculate

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Description

The list of methods to do BigInteger Calculate are organized into topic(s).

Method

booleanareEqual(BigInteger[] a, BigInteger[] b)
are Equal 
if (a == b) {
    return true;
if (a == null || b == null) {
    return false;
if (a.length != b.length) {
    return false;
...
ArrayListbase128(BigInteger val)
Convert to base 128 (bigendian), using shifts. 
ArrayList<Integer> result = new ArrayList<Integer>();
int part = val.and(BN127).intValue();
val = val.shiftRight(7);
result.add(0, new Integer(part));
while (!val.equals(BigInteger.ZERO)) {
    part = val.and(BN127).intValue();
    val = val.shiftRight(7);
    part += 128;
...
Stringbase62Encode(BigInteger number)
base Encode 
if (number.compareTo(BigInteger.ZERO) == -1) { 
    throw new IllegalArgumentException("number must not be negative");
StringBuilder result = new StringBuilder();
while (number.compareTo(BigInteger.ZERO) == 1) { 
    BigInteger[] divmod = number.divideAndRemainder(B62_BASE);
    number = divmod[0];
    int digit = divmod[1].intValue();
...
BigIntegerbitArrayToUnsignedBigInteger(int[] bits)
bit Array To Unsigned Big Integer 
BigInteger result = BigInteger.ZERO;
for (int i = 0; i < bits.length; i++)
    if (bits[i] == 1)
        result = result.setBit(i);
return result;
StringbitcoinValueToFriendlyString(BigInteger value)
Returns the given value in nanocoins as a 0.12 type string. 
boolean negative = value.signum() < 0;
if (negative)
    value = value.negate();
BigDecimal bd = new BigDecimal(value, 8);
String formatted = bd.toPlainString(); 
int decimalPoint = formatted.indexOf(".");
int toDelete = 0;
for (int i = formatted.length() - 1; i > decimalPoint + 2; i--) {
...
intbyte_size(BigInteger bi)
BigInteger size in bytes. 
int l = (bi.bitLength() + 7) / 8;
return l == 0 ? 1 : l;
BigIntegercalculateGx(BigInteger p, BigInteger g, BigInteger x)
Calculate g^x mod p as done in round 1. 
return g.modPow(x, p);
BigIntegercalculateRx_(BigInteger Rx, BigInteger n)
A method to calculate the associate value of an ECPoint R, i.e. 
String nStr = n.toString();
int nLen = nStr.length();
nStr = "0." + nStr;
double nDoubKoma = Double.parseDouble(nStr);
double fDouble = ((double) nLen + Math.log10(nDoubKoma)) / Math.log10(2.0);
fDouble = Math.ceil(fDouble / 2);
BigInteger coef2 = BigInteger.valueOf(2).pow((int) fDouble);
BigInteger Rx_ = Rx.mod(coef2).add(coef2);
...
BigIntegercastToBigInteger(Object val)
cast To Big Integer 
if (val == null) {
    return null;
if (val instanceof BigInteger) {
    return (BigInteger) val;
if (val instanceof String) {
    return new BigInteger((String) val);
...
BigInteger[]chop(BigInteger in, int bits)
chop 
BigInteger left = in.shiftRight(bits);
BigInteger right = in.subtract(left.shiftLeft(bits));
return new BigInteger[] { left, right };