import java.util.BitSet; //Generates a crc32 checksum for a given string or byte array public class crc32 { public static void main(String[] args) { System.out.println(Integer.toHexString(crc32("Hello World"))); } public static int crc32(String str) { return crc32(str.getBytes()); } public static int crc32(byte[] data) { BitSet bitSet = BitSet.valueOf(data); int crc32 = 0xFFFFFFFF; //initial value for(int i=0;i>>31)&1) != (bitSet.get(i)?1:0)) crc32 = (crc32 << 1) ^ 0x04C11DB7; //xoring with polynomial else crc32 = (crc32 << 1); } crc32 = Integer.reverse(crc32); //result reflect return crc32 ^ 0xFFFFFFFF; //final xor value } }