Java Utililty Methods CRC Calculate

long CRC = 0xffffffff;
input = input.toLowerCase();
char[] data = input.toCharArray();
for (int j = 0; j < data.length; j++) {
    int c = data[j];
    CRC ^= c << 24;
    for (int i = 0; i < 8; i++) {
        if ((CRC & 0x80000000L) != 0) {
...

return update(buf, off, len) ^ 0xFFFFFFFF;

int crc = 0xffffffff;
while (len-- != 0) {
    crc ^= buf[off++] & 0xFF;
    for (int i = 0; i < 8; i++) {
        if ((crc & 1) == 1) {
            crc >>>= 1;
            crc ^= 0xEDB88320;
        } else
...

int n = key.length();
int hash = n;
for (int i = 0; i < n; ++i)
    hash = (hash >> 8) ^ crctab[(hash & 0xff) ^ key.charAt(i)];
return hash;

long crc = 0xFFFFFFFFFFFFFFFFL;
byte[] buffer = value.getBytes();
int tab_index = 0;
for (int i = 0; i < buffer.length; i++) {
    tab_index = ((int) (crc >> 56) ^ buffer[i]) & 0xFF;
    crc = CRC64_TABLE[tab_index] ^ (crc << 8);
return ((long) (crc ^ 0xFFFFFFFFFFFFFFFFL) & 0xFFFFFFFFFFFFFFFFL);
...

byte crc;
byte polynom;
int i;
crc = crcInit;
for (i = 0; i < 8; i++) {
    if ((uint(crc) & 0x80) != 0) {
        polynom = poly;
    } else {
...

int crc = 0;
byte[] buffer = value.getBytes();
for (int i = 0; i < buffer.length; i++) {
    crc = CRC8_TABLE[buffer[i] ^ (crc & 0xFF)];
return crc;

short ci = (short) (crcInit & 0xFF);
byte crc = (byte) (CRC_TAB_8_VALUE[ci] ^ (data & 0xFF));
return crc;

int addInt = (add & 0x000000FF);
crc[0] = crc[0] ^ addInt;
for (int i = 0; i < 8; i++) {
    if ((crc[0] & 0x00000001) != 0x00000000) {
        crc[0] = (crc[0] >> 1) ^ 0x0000008C;
    } else {
        crc[0] = (crc[0] >> 1);

int c = old ^ value;
for (int i = 0; i < 8; ++i) {
    if ((c & 1) > 0)
        c = ((c >> 1) ^ 0xA001);
    else
        c = (c >> 1);
return c;
...