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29
src/main/java/com/thealgorithms/others/CRC16.java
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29
src/main/java/com/thealgorithms/others/CRC16.java
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package com.thealgorithms.others;
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/**
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* Generates a crc16 checksum for a given string
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*/
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public class CRC16 {
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public static void main(String[] args) {
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System.out.println(crc16("Hello World!"));
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}
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public static String crc16(String message) {
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int crc = 0xFFFF; // initial value
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int polynomial = 0x1021; // 0001 0000 0010 0001 (0, 5, 12)
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byte[] bytes = message.getBytes();
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for (byte b : bytes) {
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for (int i = 0; i < 8; i++) {
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boolean bit = ((b >> (7 - i) & 1) == 1);
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boolean c15 = ((crc >> 15 & 1) == 1);
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crc <<= 1;
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if (c15 ^ bit)
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crc ^= polynomial;
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}
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}
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crc &= 0xffff;
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return Integer.toHexString(crc).toUpperCase();
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}
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}
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