Java Utililty Methods BigInteger Format

String formatBigInteger(BigInteger bi, int length)
format Big Integer

String s = bi.toString(16);
StringBuffer buf = new StringBuffer(s.length());
int zeroesToAppend = length - s.length();
int count = 0;
buf.append(" ");
for (int i = 0; i < zeroesToAppend; i++) {
 count++;
 buf.append('0');
...

void formatBigIntegerBinary(final long value, byte[] buf, final int offset, final int length, final boolean negative)
format Big Integer Binary

BigInteger val = BigInteger.valueOf(value);
final byte[] b = val.toByteArray();
final int len = b.length;
final int off = offset + length - len;
System.arraycopy(b, 0, buf, off, len);
final byte fill = (byte) (negative ? 0xff : 0);
for (int i = offset + 1; i < off; i++) {
 buf[i] = fill;
...

String formatSerialNumber(BigInteger bi)
format Serial Number

if (bi == null) {
 return "";
String sn = bi.toString(16);
char[] chars = sn.toUpperCase().toCharArray();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < chars.length; i++) {
 sb.append(chars[i]);
...

String formatSerialNumber(final BigInteger serial)
Get a proper string representation of a certificate's serial number.

StringBuffer b = new StringBuffer(serial.toString(16).toUpperCase());
if ((b.length() % 2) != 0) {
 b.insert(0, "0"); 
int index = 2;
for (index = 2; index < b.length(); index += 3) {
 b.insert(index, ":"); 
return b.toString();

String formatSize(BigInteger size)
format Size

if (size.compareTo(ONE_THOUSAND) == 1) {
 return size.divide(ONE_THOUSAND).toString() + " TB";
} else
 return size.toString() + " GB";

String formatTime(BigInteger femto)
format Time

if (femto.equals(BigInteger.ZERO))
 return "0";
StringBuilder time = new StringBuilder(femto.toString());
String[] units = { "fs", "ps", "ns", "us", "ms", "sec", "ksec", "Msec" };
for (String unit : units) {
 if (time.length() <= 3 || !time.toString().endsWith("000"))
 return time + " " + unit;
 time.setLength(time.length() - 3);
...