Java Utililty Methods BigInteger to

List of utility methods to do BigInteger to

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Description

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

Method

StringbigIntToIpV6(BigInteger argInt)
big Int To Ip V 
StringBuilder str = new StringBuilder();
for (int i = 15; i >= 0; i--) {
    int shift = 8 * i;
    Integer n = 0xff;
    BigInteger num = argInt.shiftRight(shift).and(new BigInteger(n.toString()));
    int intNum = num.intValue();
    String s = Integer.toHexString(intNum);
    if (s.length() < 2) {
...
byte[]BigIntToPaddedByteArray(BigInteger bi, int length)
Converts a BigInt (What is stored in Hydra-keystore and what our version of SSSS is using...) to a padded byte-array. 
byte[] biAsBytes = bi.toByteArray();
return paddedByteArray(biAsBytes, length);
voidbigIntToSortableBytes(BigInteger bigInt, int bigIntSize, byte[] result, int offset)
Encodes a BigInteger value such that unsigned byte order comparison is consistent with BigInteger#compareTo(BigInteger) . 
byte[] bigIntBytes = bigInt.toByteArray();
byte[] fullBigIntBytes;
if (bigIntBytes.length < bigIntSize) {
    fullBigIntBytes = new byte[bigIntSize];
    System.arraycopy(bigIntBytes, 0, fullBigIntBytes, bigIntSize - bigIntBytes.length, bigIntBytes.length);
    if ((bigIntBytes[0] & 0x80) != 0) {
        Arrays.fill(fullBigIntBytes, 0, bigIntSize - bigIntBytes.length, (byte) 0xff);
} else if (bigIntBytes.length == bigIntSize) {
    fullBigIntBytes = bigIntBytes;
} else {
    throw new IllegalArgumentException(
            "BigInteger: " + bigInt + " requires more than " + bigIntSize + " bytes storage");
fullBigIntBytes[0] ^= 0x80;
System.arraycopy(fullBigIntBytes, 0, result, offset, bigIntSize);
assert sortableBytesToBigInt(result, offset, bigIntSize).equals(bigInt) : "bigInt=" + bigInt + " converted="
        + sortableBytesToBigInt(result, offset, bigIntSize);
StringbiToHex(BigInteger bi)
Turn a BigInteger into a hex string. 
return bytesToHex(bi.toByteArray());
byte[]byteConvert32Bytes(BigInteger n)
byte Convert Bytes 
byte tmpd[] = (byte[]) null;
if (n == null) {
    return null;
if (n.toByteArray().length == 33) {
    tmpd = new byte[32];
    System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);
} else if (n.toByteArray().length == 32) {
...
BigIntegerconcat(BigInteger left, BigInteger right)
concat 
return concat(left, right, right.bitLength());
Stringconvert(BigInteger value, int base, boolean extra)
Convert value to a string in the given base. 
if (base == 2) {
    if (extra)
        return value.toString(2) + "B";
    else
        return value.toString(2);
} else if (base == 10) {
    return value.toString();
} else if (base == 16) {
...
ListconvertAllElementsToLong(P bigIntegers)
convert All Elements To Long 
if (bigIntegers == null) {
    return null;
try {
    ArrayList<Long> results = new ArrayList<Long>();
    for (BigInteger bigInteger : bigIntegers) {
        results.add(bigInteger.longValue());
    return results;
} catch (Exception e) {
    throw new RuntimeException(e);
InetAddressconvertBigIntegerIntoInetAddress(final BigInteger i)
convert Big Integer Into Inet Address 
if (i.compareTo(BigInteger.ZERO) < 0) {
    throw new IllegalArgumentException(
            "BigInteger is negative, cannot convert into an IP address: " + i.toString());
} else {
    final byte[] bytes = i.toByteArray();
    if (bytes.length == 0) {
        return InetAddress.getByAddress(new byte[] { 0, 0, 0, 0 });
    } else if (bytes.length <= 4) {
...
byte[]convertBigIntegerToNBytes(final BigInteger bigInteger, final int numBytes)
Utility method to convert BigInteger to n element byte array 
if (bigInteger == null) {
    return null;
byte[] inputArray = bigInteger.toByteArray();
byte[] outputArray = new byte[numBytes];
if (bigInteger.compareTo(BigInteger.ZERO) < 0) {
    Arrays.fill(outputArray, (byte) -1);
} else {
...