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

BigIntegerclip(BigInteger bi, int numberOfBytes)
Used on BigIntegers known to fit into x number of bytes. 
byte[] unclipped = bi.toByteArray();
if (unclipped.length <= numberOfBytes) {
    return bi;
byte[] constructionBytes = Arrays.copyOfRange(unclipped, unclipped.length - numberOfBytes,
        unclipped.length);
return new BigInteger(constructionBytes);
BigInteger[]clone(BigInteger[] data)
clone 
if (data == null) {
    return null;
BigInteger[] copy = new BigInteger[data.length];
System.arraycopy(data, 0, copy, 0, data.length);
return copy;
voidcopy_into_byte_array(BigInteger bi, byte[] a)
Copy a BigInteger into a byte array. 
byte[] bia = bi.toByteArray();
assert bia.length <= a.length || (bia.length == a.length + 1 && bia[0] == 0);
for (int i = 0; i < a.length - bia.length; i++)
    a[i] = 0;
System.arraycopy(bia, bia.length == a.length + 1 ? 1 : 0, a,
        bia.length == a.length + 1 ? 0 : a.length - bia.length,
        bia.length == a.length + 1 ? a.length : bia.length);
return;
...
BigInteger[]copyOf(BigInteger[] data, int newLength)
copy Of 
BigInteger[] tmp = new BigInteger[newLength];
if (newLength < data.length) {
    System.arraycopy(data, 0, tmp, 0, newLength);
} else {
    System.arraycopy(data, 0, tmp, 0, data.length);
return tmp;
BigInteger[]copyOfRange(BigInteger[] data, int from, int to)
copy Of Range 
int newLength = getLength(from, to);
BigInteger[] tmp = new BigInteger[newLength];
if (data.length - from < newLength) {
    System.arraycopy(data, from, tmp, 0, data.length - from);
} else {
    System.arraycopy(data, from, tmp, 0, newLength);
return tmp;
...
BigIntegercreateUnsignedBigInteger(byte[] data)
create Unsigned Big Integer 
byte[] unsigned = new byte[data.length + 1];
unsigned[0] = (byte) 0x00;
System.arraycopy(data, 0, unsigned, 1, data.length);
return new BigInteger(unsigned);
StringcreateUUID(int version, String gtin, BigInteger phar)
The deterministic id of an ArtikelstammItem item. 
return createUUID(version, gtin, phar, true);
byte[]cryptRSA(byte[] data, BigInteger exponent, BigInteger modulus)
crypt RSA 
return new BigInteger(data).modPow(exponent, modulus).toByteArray();
BigIntegerdecodeBigInteger(String value)
decode Big Integer 
int radix = 10;
int index = 0;
boolean negative = false;
if (value.startsWith("-")) {
    negative = true;
    index++;
if (value.startsWith("0x", index) || value.startsWith("0X", index)) {
...
int[]decodeBitListFromBigInteger(BigInteger bits)
decode Bit List From Big Integer 
List<Integer> resultList = new ArrayList<Integer>();
BigInteger mask = BigInteger.ONE;
int valueCandidate = 1;
while (mask.compareTo(bits) <= 0) {
    if ((mask.and(bits)).equals(mask)) {
        resultList.add(Integer.valueOf(valueCandidate));
    valueCandidate++;
...