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CRC-CCITT validation in java (android)
int crc = 0xFFFF;          // initial value
    int polynomial = 0x1021;   // 0001 0000 0010 0001  (0, 5, 12)

    // byte[] testBytes = "123456789".getBytes("ASCII");

    byte[] bytes = args[0].getBytes();

    for (byte b : bytes) {
        for (int i = 0; i < 8; i++) {
            boolean bit = ((b   >> (7-i) & 1) == 1);
            boolean c15 = ((crc >> 15    & 1) == 1);
            crc <<= 1;
            if (c15 ^ bit) crc ^= polynomial;
         }
    }

    crc &= 0xffff;
    System.out.println("CRC16-CCITT = " + Integer.toHexString(crc));