public static String bytesToHex(byte[] bytes) {
char[] hexArray = "0123456789ABCDEF".toCharArray();
char[] hexChars = new char[bytes.length * 3];
for ( int j = 0; j < bytes.length; j++ ) {
int v = bytes[j] & 0xFF;
hexChars[j * 3] = hexArray[v >>> 4];
hexChars[j * 3 + 1] = hexArray[v & 0x0F];
hexChars[j * 3 + 2] = '-';
}
return new String(hexChars);
}